System Engineer

Role Overview Toss Careers is hiring a Systems Engineer to strengthen our backup infrastructure in Seoul. This position focuses on building, maintaining, and improving backup systems that protect critical data and support business continuity. What You Will Do Design, implement, and maintain backup solutions to safeguard company data Work with teams across the company to troubleshoot and resolve backup-related issues Monitor and optimize backup system performance Identify areas for improvement and help refine backup processes over time Location This role is based in Seoul.

Toss Securities is seeking an IDC Infrastructure Engineer (Network & System) to help build and maintain the backbone of our data center operations in Seoul. This position focuses on ensuring the stability, efficiency, and continuous improvement of our large-scale infrastructure, covering everything from network design to physical equipment and operational processes. The role is primarily based at our modern data center (IDC), working closely with a team of network and system engineers. What you will do Design hardware architectures for network and server infrastructure, including equipment selection and implementation standards. Develop data center network architectures (such as Spine-Leaf and redundancy) and server/storage configurations. Define technical standards for bandwidth, NIC specifications (10G/25G/100G/400G), cabling (OM, LR/SR, MPO), and switch port setups. Plan physical infrastructure, taking into account rack space, power, and environmental needs. Set and manage organization-wide standards for equipment models, firmware, and configuration templates. Install, configure, and operate servers, storage, and network equipment on site, driving ongoing improvements. Oversee equipment transport, installation, and relocation, ensuring quality and safety throughout the process. Coordinate with contractors for cabling and equipment setup, maintaining technical standards and quality control. Monitor the IDC environment (power, temperature, network, equipment status) and respond proactively to anomalies. Lead first-level incident response and root cause analysis, working to prevent recurrence and resolve complex issues across network, system, and physical layers. Manage the lifecycle of IDC assets, ensuring data integrity and optimizing long-term operational plans for capacity, power, and space. Collaborate with colocation service providers and partners to manage schedules, quality, and costs. Automate repetitive operational tasks, such as firmware upgrades and configuration deployments, and build monitoring/CMDB integrations using SNMP and REST API. Establish and refine operational standards, procedures, and policies for ongoing efficiency. Requirements At least 5 years of experience in data center (IDC) or infrastructure design and operations. Experience designing data center network architectures (Spine-Leaf, redundancy, etc.). Understanding of server/storage hardware and operating systems (Linux, Windows, Hypervisor). Ability to design at the hardware level, with knowledge of NICs, cabling, and switch ASICs. Experience with IDC space planning, rack layout, power, and space design and operations. Background in large-scale equipment installation, relocation, and asset management within IDC operations. Problem-solving skills that address both physical and logical aspects of incidents. Strong communication skills for effective collaboration with contractors and internal teams. Experience with equipment implementation proof-of-concept (PoC), vendor evaluation, and performance validation. Proven ability to create infrastructure standard documents, such as design guides and operational procedures.

Join Our Team The System Engineer at Toss Securities is part of the System Engineering Team alongside InfraOps Engineers. We build and support systems for both external and internal clients, managing our data center infrastructure. Our team collaborates with top talent in various domains like finance, commerce, portals, and gaming. We aim to support product focus by developing infrastructure that can handle large-scale traffic, while also pushing for automation to accelerate product delivery. Key Responsibilities Manage servers, operating systems, SAN, storage, and backup systems, ensuring robust infrastructure for customer service systems. Allocate necessary server equipment and integrate services when launching new offerings. Operate and manage both IDC and public cloud infrastructure. Who We Want 5+ years of experience in system engineering on Linux OS environments. Proficient in scripting languages (Shell, Python, Perl, Ruby, etc.) to facilitate infrastructure operations in collaboration with developers. Experience in architecting and managing public cloud platforms (AWS). Strong handling of Linux systems and a solid understanding of business implications relevant to our services. Experience in building and operating system automation deployment solutions is a plus. Application Tips Detail two memorable instances of technical problem resolution (e.g., optimization, bug fixes). Provide detailed accounts of projects you've contributed to, including duration, role, tech stack used, and improvements achieved. List the versions of the OS and key solutions you have managed. Journey to Joining Toss Securities Application Submission > Job Interview > Cultural Fit Interview > Reference Check > Compensation Negotiation > Final Offer and Onboarding

Toss Care seeks a Tech Excellence Manager specializing in Infrastructure and Systems for its Seoul office. This position plays a central role in shaping and upholding technical standards throughout the organization. The focus is on enhancing system reliability, improving efficiency, and ensuring that infrastructure aligns with evolving technologies. Key Responsibilities Encourage strong technical practices within and across teams Collaborate with colleagues from various departments to strengthen infrastructure Lead initiatives to optimize system performance Contribute to company-wide efforts that maintain high technical standards Role Focus This role centers on continuous improvement of infrastructure and systems, balancing technical excellence with practical implementation. Working closely with different functions, the manager will help ensure that the company’s systems remain reliable and efficient as technologies evolve.

About the Team You Will Join The Internal System Engineer position at Toss Securities is responsible for managing in-house infrastructure and IT support, collaborating closely with IT Managers and Internal Network/System Engineers. You will design both wired and wireless networks for the headquarters and remote locations, while integrating user-centric security technologies to create a seamless work environment. Your role will focus on enhancing internal infrastructure and operational efficiency, allowing Toss Securities colleagues to concentrate on their work. Your Responsibilities Upon Joining Establish and operate in-house VDI/HCI/virtualization infrastructure. Oversee the deployment and management of the Horizon VDI environment. Build and manage the necessary servers and HCI infrastructure. Streamline repetitive tasks through automation and scripting solutions. We Are Looking for Someone Who Has experience in building and managing servers based on Windows and Linux. Is capable of establishing and operating hypervisor environments such as VMware and Docker. Can manage VMware Horizon-based VDI environments. Possesses experience in setting up and operating various infrastructure services such as DNS, DHCP, AD, and SMB. Has basic knowledge of NAC, VPN, and DLP technologies. Has experience in establishing and managing monitoring tools like Prometheus, Grafana, and Zabbix. Is proficient in automation development using Python, PowerShell, and Ansible. Journey to Joining Toss Securities Application > Job Interview > Cultural Fit Interview > Reference Check > Salary Negotiation > Final Acceptance and Onboarding Please Note If any false information is found in the resume or if disciplinary actions are confirmed during employment, the recruitment may be canceled. Applicants who fall under the hiring restrictions or disqualifying reasons according to Toss Securities regulations may have their applications canceled. Individuals with disabilities or who are veterans will be given preferential treatment according to relevant laws. A Word for Future Colleagues> "You can experience everything as a System Engineer." - I joined Toss Securities after working as a System Engineer in a mobile service company with large traffic. In my previous role, I managed numerous platforms, but at Toss Securities, I realized I had a superficial understanding of infrastructure operations. Here, I closely collaborate with various departments and gain a comprehensive understanding of the overall architecture. I recommend Toss Securities for System Engineers who are eager to learn, passionate about their work, and seeking the best environment for a career quantum leap!

About the Role tosscareers is hiring an Infrastructure Automation Engineer in Seoul. This role focuses on building and maintaining automated systems that improve the efficiency and reliability of IT services. The position involves hands-on work designing, implementing, and supporting infrastructure automation. What You Will Do Design automated solutions for managing infrastructure Implement and maintain automation tools and workflows Support the stability and scalability of IT services through automation Who We’re Looking For Experience or strong interest in cloud technologies Familiarity with automation tools and systems Motivated to improve IT operations through automation

Join Our Team!The Internal Infrastructure Engineer at Toss CX is a vital member of the General Affairs Team, responsible for establishing and implementing optimal internal infrastructure strategies that align with the rapid expansion of our business.This role transcends basic IT support, as you will enhance our network and security systems based on financial security guidelines, ensuring a safe and engaging work environment for all team members.Your Responsibilities:Design and Stabilize Internal IT Infrastructure: Create a scalable internal network and server infrastructure that matches Toss CX's business direction and organizational size, ensuring reliable operations.Manage Office Network and Security Infrastructure: Optimize and maintain the overall office network architecture, including L2/L3 switches and access points. Implement and manage cutting-edge security solutions like Zscaler, NAC, and WIPS to uphold a zero-trust work environment.Enhance IT Governance and Environment: Lead IT projects to establish an account management system based on Okta and Active Directory, standardizing internal infrastructure and maximizing work efficiency.

About the Network Engineer Internship at Daangn Daangn is looking for a Network Engineer Intern to join the Infrastructure (Network) team in Seoul. This is a 3-month internship designed for those eager to develop technical skills while supporting a platform that connects hyperlocal businesses and users worldwide. Meet the Network Team The Network Team builds and maintains secure, high-performance network services for Daangn customers. The group designs and operates a network environment tailored for both local and global needs. Team members automate routine tasks, monitor traffic flow and network status in real time, and respond quickly to issues. Maintaining service quality during traffic spikes and protecting the platform from security threats are central to the team’s mission. What You Will Do Help design and operate Daangn’s service and office network architecture (cloud, wired, wireless) Assist in designing and operating network security architecture Contribute to the development and operation of network observability and automation platforms Who We’re Looking For Currently pursuing or recently completed a degree in Computer Science, Information Communication, Information Security, or a related field Solid understanding of basic networking concepts, including the OSI model and TCP/IP Knowledge of IPv4 addressing and subnetting Basic experience with physical network devices such as switches and routers Familiarity with network security concepts, including firewalls Ability to use scripting languages like Python or Bash at a basic level or higher Motivated to learn and grow proactively Preferred Qualifications Hands-on experience with AWS or GCP consoles Understanding of REST API calls and integrations Practical experience with networks or infrastructure through personal projects or coursework Knowledge of security principles such as encryption, authentication, and access control Interest in network observability or automation Attention to documentation and willingness to share knowledge within the team Additional Details This internship lasts for 3 months. Daangn gives preference to candidates with disabilities or veterans, in line with the 'Promotion of Employment for the Disabled and Vocational Rehabilitation Act' and the 'Act on the Honorable Treatment and Support of Persons of Distinguished Service.' Applications close on May 3rd, 11:59 PM. The deadline may change depending on circumstances. The expected start date is June 1st, though this may be adjusted if needed.

Join Our Innovative TeamThe Machine Learning Engineer (Infra) will be part of the ML Platform Team within the Product Division at Toss Securities.The primary goal of the ML Platform Team is to create an optimal machine learning platform that enables the efficient and stable development and operation of various AI/ML services at Toss Securities.The ML Engineer (Infra) will focus on maximizing the efficiency of large-scale AI infrastructure, finely controlling resource usage, and enhancing infrastructure performance to its peak. Your Responsibilities Design and operate high-performance AI computing environments reliably.Design and operate top-of-the-line GPU clusters (H100, B300 series) connected via InfiniBand and high-performance storage (400Gbps) within a Kubernetes environment.Beyond merely building infrastructure, optimize networks and storage to extract the full potential of hardware performance. Develop a comprehensive control system for the entire AI infrastructure.Create an observability system to integrate and monitor AI resources distributed across internal infrastructure and external cloud.Implement management features to prevent resource monopolization by specific services and allocate resources precisely based on importance. Create automation tools for the most efficient resource usage.Analyze actual usage patterns to develop tools that recommend 'just-right resources' to avoid waste.Implement features that automatically scale up or down based on real-time model performance or error rates, and reallocate GPUs where necessary. Establish an environment for identifying and resolving model performance bottlenecks.Build profiling environments to accurately pinpoint slowdowns during model training or serving.Support the analysis and improvement of performance degradation causes between hardware and software. Who We Are Looking ForYou have experience building and operating Kubernetes-based ML infrastructures that handle large-scale traffic.You take responsibility for reliably operating live services beyond simple development.You have experience persistently analyzing and debugging to resolve root causes when issues arise.You possess a solid understanding of system resources (GPU/CPU/Memory/Network/Storage) and have experience building monitoring systems for them.You value the process of solving various problems that arise during service operations and strengthening the system. Preferred QualificationsExperience in unified monitoring of resource usage in large-scale clusters.Experience building systems to systematically control resources through Quota and Rate Limits.Experience with open-source platforms like Kubeflow or Kubernetes, including in-depth modifications as needed.Experience analyzing and optimizing bottlenecks at the kernel level using tools like Nsight Systems/Compute or PyTorch Profiler.Experience designing tasks to reduce costs or enhance performance tailored to workload characteristics (Rightsizing, Cost Optimization).Experience leveraging GPU virtualization technologies like MIG and MPS to maximize resource utilization.

About the Team The Sales Platform Team at Toss focuses on developing the technology that supports Toss’s B2B business. The team works to create and maintain systems that help drive business growth. Role Overview The Sales Systems Engineer will work hands-on with sales-related platforms, including Salesforce. This position plays a key part in shaping the tools that support sales operations and data management. Main Responsibilities Work directly with sales systems, such as Salesforce, to support business goals Partner with Business Analysts to design and build data infrastructure for extracting business insights Manage and maintain sales data for the company Location This role is based in Seoul.

Join Our TeamWe are on the lookout for talented individuals who are eager to contribute to setting the global standard for video understanding AI! At twelve-labs, we are developing cutting-edge AI models that efficiently process vast amounts of video data, offering specialized search, analysis, summarization, and insight generation capabilities.Our models are utilized by the world’s largest sports leagues, enabling them to quickly and accurately select highlights from extensive game footage, providing a super-personalized viewing experience. In South Korea, integrated control centers leverage our technology to efficiently explore CCTV footage, responding swiftly to crisis situations. Major broadcasters and studios worldwide employ our models to create content for billions of viewers.As a deep tech startup with offices in San Francisco and Seoul, twelve-labs has been recognized as one of the top 100 AI startups globally by CB Insights for four consecutive years. We have secured over $110 million in funding from renowned VCs and enterprises, including NVIDIA, NEA, Index Ventures, Databricks, and Snowflake. Notably, our AI models, developed in Korea, are the only ones available through Amazon Bedrock. We thrive on creating innovative products with exceptional colleagues and growing alongside our global clientele.At twelve-labs, we operate based on core values that include:A reflective and honest attitude towards oneself and the teamResilience and humility in the face of failure and feedbackA commitment to continuous learning to enhance the team’s capabilitiesIf you enjoy solving challenging problems and growing through the process, the opportunity is here at twelve-labs.About Our TeamOur Infrastructure Team believes that 'data determines the performance of AI models.' We build high-quality data pipelines for the training and evaluation of multimodal AI models end-to-end. We collect, filter, process, and label diverse multimodal data, collaborating with various teams to design training data that can uncover new model capabilities. Additionally, we create evaluation datasets that reflect actual user experiences and develop internal tools to streamline these processes continuously.Your RoleAs an Infrastructure Engineer at twelve-labs, you will design and build core infrastructure to ensure the stable and scalable operation of our AI SaaS platform. You will work with system architectures across various cloud and on-premise environments, constructing robust infrastructure that supports our video AI foundation models. In our rapidly evolving startup environment, you will optimize performance, security, and flexibility while closely collaborating with multiple internal teams.Key ResponsibilitiesDesign and operate multi-tenant architecture for global enterprise clientsDevelop automation and scalable CI/CD pipelines using TerraformBuild flexible infrastructure encompassing various cloud environments such as AWS, GCP, and Azure, as well as on-premisesOptimize secure and efficient cloud infrastructure through advanced monitoring and security systemsDesign scalable architecture to rapidly support new video AI models and servicesCollaborate with PMs, engineers, and researchers to bring AI products to fruitionIdeal CandidateExperience in building and operating infrastructure in cloud environments such as AWS, GCP, or AzureProficiency in using IaC tools like Terraform and Ansible for automation and architecture designFamiliarity with Kubernetes and container orchestration

Role SummaryAs a Principal Engineer in Systems Design Engineering, you will take full ownership of the end-to-end PCIe system design for our NVMe SSD product line. This encompasses client laptops and enterprise servers, guiding the process from PHY/MAC review through ASIC/SoC integration, PCIe SFR/register analysis, and establishing firmware design guidelines that ensure robust link training, link transitions, and low-power behavior. This pivotal role sits at the intersection of PCIe specification compliance, NVMe operational behavior, firmware architecture, platform interoperability, and power/performance optimization.Key Responsibilities· Lead the architecture of system-level PCIe Gen5/Gen6 from an NVMe SSD endpoint perspective.· Define and oversee PCIe + NVMe integration across various SSD products.· Conduct PHY + MAC IP reviews, establishing integration requirements and constraints.· Manage SoC/ASIC integration, including clocks, resets, power domains, straps, lane mapping, and sidebands.· Develop PCIe SFR + firmware guidelines covering flow control, LTSSM observability, power states, and error handling.· Oversee link and low power transitions, including DLRM, L1, L1SS, L0p, ASPM, clock-down, and APST coordination.· Facilitate bring-up and debugging processes: enumeration, speed negotiation, width detection, stability, and AER/error recovery.· Tune customer requirements focusing on latency/power, performance, reliability, and consistency.· Provide expert knowledge regarding PCIe configuration and extended capability registers.· Act as the technical authority for cross-team and customer escalations.Detailed Responsibilities (End-to-End PCIe for NVMe SSD)1. PHY/MAC IP Review (System Design Perspective)· Understand criteria for PHY/MAC/controller IP, including Gen5/Gen6 readiness and equalization capability.· Review IP documents for compliance features and link speed support.· Specify platform-facing requirements such as retimer/redriver compatibility.2. ASIC/SoC Integration Ownership· Integrate PCIe subsystems focusing on clock handling, reset behavior, and power domains.· Define lane policies for NVMe, including width detection and recovery strategies.

About the Team You'll Join The System Engineer at Toss Securities is a part of the System Engineering Team alongside the InfraOps Engineer. We build and support systems for both external and internal customers while managing our IDC. Our collaborative team consists of exceptional members from various fields including finance, commerce, portals, and gaming. With a focus on 'supporting everything so that we can concentrate solely on the product', we strive to establish infrastructure capable of handling large-scale traffic and are actively pursuing automation to facilitate faster product releases. Your Responsibilities Design, implement, and optimize virtualization infrastructure using VMware and KVM. Conduct ongoing research and testing to provide KVM infrastructure within Kubernetes environments. Collaborate with the service part of System Engineering to deliver virtualization infrastructure and troubleshoot issues as they arise. Design and optimize key architectures related to virtualization, including networking, storage, and computing. Design and operate monitoring solutions such as logging and metric collection, and research automation for data collection. Who We Want to Work With Deep understanding of the fundamental concepts of virtualization technology and its optimization. Experience operating both commercial and open-source virtualization solutions is a plus. Hands-on experience with Kubernetes and troubleshooting within its environment is preferred. Experience in monitoring visualization and related research is advantageous. A passion for learning new technologies and actively applying them in operational settings is desired. Experience not only with virtualization infrastructure but also in service operations is a benefit. Resume Recommendations Please detail two memorable instances of technical problem-solving (optimization, bug fixes, etc.). Describe your contributions to projects in detail (project duration, role, technology stack used, improvements made before and after the project). List the versions of the OS and major solutions you have worked with. Journey to Joining Toss Securities Application submission > Job interview > Cultural fit interview > Reference check > Salary negotiation > Final acceptance and onboarding. Please Note If any false information is discovered in your resume or if any disciplinary issues arise during your employment history, your application may be canceled. According to Toss Securities regulations, applicants who are prohibited from hiring or have disqualifying factors may also have their applications canceled. Disabled individuals and veterans will be given preference in accordance with relevant laws. A Note for Future Colleagues"You can experience everything a System Engineer does."- I worked as a System Engineer in a mobile service company handling massive traffic before joining Toss Securities. In my previous role, I supported numerous platforms, but while working at Toss Securities, I realized that I had been operating without understanding the fundamental principles behind the infrastructure systems. At Toss Securities, we closely collaborate with various departments within the infrastructure. As a System Engineer, I have come to understand the overall architecture and learned various technologies that have illuminated the principles of infrastructure systems. I highly recommend Toss Securities to those System Engineers who want to avoid complacency, love their work, and wish to make a quantum leap in their careers within the best environment for engineers!

Who will you collaborate with?As a valued member of our team, reporting directly to the Sales Director, you will closely engage with the local sales and field service teams, as well as the project team at our Sisco facility. Your primary focus will be on brake systems, encompassing various responsibilities such as sales, business development, project management, and providing engineering support for Hyundai Rotem. How will you make an impact?In this role within the OE Sales team, you will spearhead project sales of brake systems to our clients. You'll coordinate with our Sisco to ensure product suitability for project specifications, address technical challenges with customers, and cultivate long-term relationships. A glimpse into your daily responsibilities:Manage all sales operations for the brake systems business;Lead local project initiatives, ensuring they align with our company's strategic goals;Identify and pursue business development opportunities to meet sales targets;Promote Faiveley Transport’s comprehensive engineering solutions, including services and products for the designated product line;Define engineering requirements based on customer needs and facilitate technical coordination with our HQ and SisCos in Europe;Assist local customers with the application of products within Brake Systems, Air Generation & Dryer, Actuator, and Pneumatic Valves;Address customer quality concerns and liaise with manufacturing sites to resolve issues;Collaborate with customers’ engineering, design, maintenance, project management, and procurement teams to explore new business avenues;Serve as the main point of contact between customers and our SisCo in Shanghai and Europe to ensure technical coordination;Maintain databases and support payment collection efforts;Regularly meet with customers to understand their needs and requirements;Some business travel may be necessary. Key Technical Responsibilities:Define the functions of brake systems at the train level and lead engineering studies to achieve performance targets;Prepare technical proposals and system documentation, including requirements specifications and schematics;Define and conduct commissioning tests for brake systems;Carry out functional and software verification testing;Conduct system-level Failure Modes Effects and Criticality Analysis (FMECA);Collaborate with the HQ engineering team on brake calculations;Support final assembly and verify designs through both static and dynamic tests. What we are looking for:A degree in Mechanical or Electrical Engineering or a related discipline;Strong communication skills and ability to work collaboratively in a team environment;Proven problem-solving abilities in a technical context.

Security Engineers at daangn focus on protecting infrastructure and keeping user data safe. This position centers on finding vulnerabilities through penetration testing and setting up strong security protocols across our systems. Role overview This role involves hands-on work with infrastructure security in Seoul. The main responsibility is to identify and assess security risks, then act to address those issues. Attention to detail and a methodical approach are important, as your work directly impacts the safety of our platform. What you will do Conduct penetration tests to uncover vulnerabilities in our infrastructure Implement and maintain security protocols to meet high standards Support ongoing efforts to protect user data and system integrity Requirements Experience with infrastructure security and penetration testing Ability to identify, analyze, and address security vulnerabilities Commitment to maintaining strong security practices

Key ResponsibilitiesSpearhead the design of AI system PCBs.Create and refine schematics while providing layout consultation for PCBs.Analyze and offer insights on PCB signal integrity and power integrity.Essential QualificationsBachelor's degree in Electrical or Electronics Engineering.5 to 10 years of relevant industry experience.In-depth knowledge of passive components, DC-DC converters, LDOs, NOR-flash, DDR, and logic gates.Proficient in Allegro software for PCB design.Strong understanding of PCB stack-up configurations.Experienced in using measurement equipment effectively.Preferred QualificationsSolid understanding and hands-on experience with various VRM topologies.Comprehensive knowledge of passive components.Extensive experience in power supply system design.Experience with PCB-level power integration.Familiarity with circuit simulation tools such as SIMPLIS, Allegro, and HSPICE.Knowledge of high-speed circuit design principles.Contact Informationrecruit@furiosa.ai

Welcome to the Journey of Joining the Daangn Team!At Daangn, we are committed to fostering an environment where individuals can grow alongside the company's success.Our recruitment team is here to assist you in achieving those joyful moments of collaboration with amazing colleagues. Introducing the ML Infrastructure TeamThe ML Infrastructure Team within our Infrastructure Department is responsible for developing a robust and scalable machine learning infrastructure that ensures effective service delivery and efficient operation of Daangn’s machine learning-based services. Machine learning is extensively utilized at Daangn to enhance service quality and improve user convenience across various domains, including feed recommendations, ad recommendations, and service operations. The ML Infrastructure Team handles everything from data processing, model training, model serving, to the deployment processes necessary for machine learning service development. Daangn's GenAI Platform Building Serverless ML Training Infrastructure: Vertex AI Pipelines & TFX ML Infrastructure with GCP | 2025 Daangn GCP MeetupYour ResponsibilitiesDevelop and manage model servers and serving systems for efficient deployment of various machine learning models.Develop and maintain ML infrastructure SDKs, frameworks, and training systems used across the organization.Create specialized monitoring systems for machine learning services to detect quality changes early.Implement various optimization methods across the machine learning infrastructure to enhance development iteration speed and resource efficiency.We Are Looking ForA proficient user of one or more programming languages such as Python or C++.Strong understanding of the infrastructure required for training and serving machine learning models.Over 7 years of experience in backend service or machine learning service development/operations.A desire to improve machine learning infrastructure through solid software engineering skills.Experience in developing and operating GPU clusters.Preferred QualificationsFamiliarity with cloud services like AWS and GCP, with practical experience.A deep understanding of the machine learning ecosystem and contributions to open source projects (e.g., TensorFlow, PyTorch, TensorFlow Extended).A keen interest in new technological trends and a willingness to learn.Additional InformationFor full-time hires, there is a 3-month probation period.We prioritize individuals with disabilities and veterans according to the Employment Promotion and Vocational Rehabilitation Act and the Act on the Honorable Treatment and Support of Veterans.Application Process1. Document Screening → 2. Video Interview → 3. Technical Interview → 4. Culture Fit Interview and Reference Check → 5. Compensation Negotiation → 6. Final Acceptance and OnboardingGo to Daangn Joining Journey Guide

Key ResponsibilitiesManage and operate the testing infrastructure for our software and hardware solutions.Conduct operations and maintenance on bare-metal equipment utilized for evaluations.Support the evaluation infrastructure to ensure successful product validation.

About the Team You Will JoinThe Security Infrastructure team is dedicated to designing security architectures that ensure the safe expansion of Toss's business, implementing and automating these architectures in real-world environments.This team covers cloud, network, and endpoint security, directly designing and implementing security policies and controls based on key infrastructure.We select technology stacks, create log architectures, and access control models, building a structure that defends against actual threats rather than merely implementing security for security's sake.Our team consists of members with diverse experiences, primarily from corporate information security roles and specialized information protection companies.We are looking for individuals who start with the question of “Why?” to improve security structures and design safer, more efficient methods while balancing technology and business needs.Responsibilities You Will UndertakeDevelop and manage information security solutions that protect Toss's services and employee environments.Establish and operate an access control system for internal information systems.Build a network separation environment and information leak response systems in accordance with financial compliance.Plan and operate systems to enhance security visibility and access control systems.Conduct modern threat analysis and incorporate global trends while establishing AI-based detection and analysis systems and real-time response strategies.Additional ResponsibilitiesDesign, build, and operate infrastructure security architectures across cloud (AWS/GCP/Azure) and on-premises/hybrid environments, covering networks, servers, databases, and containers. You may focus on either cloud or network based on your strengths.Design and reliably implement core security policies like IAM, network segmentation, access control, and encryption (KMS) in real environments.Structure repetitive security operations based on IaC and automation while collaborating with other teams to establish actionable security standards.Analyze security events and breach incidents to design and fundamentally improve security structure, policies, and automation.Ideal CandidateWe are searching for individuals with over 3 years of relevant experience.You should have experience dealing with infrastructure across cloud, network, and systems, not limited to one area.Experience in enhancing detection and response systems using security solutions like CSPM/CNAPP, SIEM, EDR, WAF, and KMS is essential.Experience in designing or improving operational efficiency through security automation and IaC with tools like Terraform/CloudFormation, Ansible, and Python is required.You should have experience interpreting and integrating security requirements in financial and regulatory environments (ISMS-P, ISO27001, PCI-DSS).