Senior Backend/Infrastructure Engineer at Perplexity | Belgrade

Join Perplexity as a Senior Infrastructure Engineer and play a pivotal role in transforming how individuals search and engage with the internet. Your dedication and expertise will be essential in delivering a top-tier product. This position uniquely combines infrastructure mastery with software engineering, allowing you to take ownership of the crucial systems that drive our products and development processes.Key ResponsibilitiesConstruct and sustain a robust and scalable infrastructure to enable high-performance search functionalities.Create internal tools and automation processes to enhance developer workflows and operational effectiveness.Architect, deploy, and manage cloud-native systems, primarily utilizing AWS.Enhance and maintain CI/CD pipelines, testing frameworks, and release protocols.Troubleshoot and optimize Linux environments, containerized applications, and backend services.Contribute directly to product codebases, engaging with languages such as Python, Go, and other systems-level languages.QualificationsProven experience in cloud infrastructure (AWS preferred), systems architecture, and automation.Extensive knowledge of Linux internals, including performance optimization and debugging techniques.Demonstrated experience in building or maintaining CI/CD systems and associated tools.Strong proficiency in Python and at least one systems programming language (Go, Rust, C/C++, or Java).Ability to navigate both infrastructure and application-level code seamlessly.A proactive and enthusiastic learner who excels in a dynamic, innovative environment.

At Perplexity, we are in search of a passionate Backend/Infrastructure Engineer Intern to join our dynamic and impactful team dedicated to enhancing our search capabilities. This role presents a unique opportunity to collaborate with seasoned engineers in designing, building, and maintaining the robust infrastructure and backend services that ensure Perplexity remains fast, reliable, and scalable.Internship Duration: 12 - 24 weeks, full-time, in-person at our Belgrade office.Key Responsibilities:Construct and uphold infrastructure that drives high-performance search systems, with guidance from senior engineers.Design and implement internal tools and automation to enhance developer workflows and operational productivity.Aid in the design, deployment, and monitoring of cloud-native systems utilizing AWS.Contribute to the optimization of CI/CD pipelines, testing infrastructure, and release processes.Debug and enhance Linux-based services, containers, and backend systems.Participate in coding for products, primarily utilizing Rust, Go, or C++.Qualifications:Currently pursuing a degree in Computer Science, Engineering, or a related field, or possess equivalent practical experience.Familiarity with at least one programming language such as Go, Rust, or C/C++, gained through academic coursework or personal projects.A basic understanding or exposure to cloud infrastructure (e.g., AWS) and Linux systems is advantageous, though not mandatory.A keen interest in infrastructure, distributed systems, or backend engineering, along with a willingness to learn about CI/CD, monitoring, and performance optimization.A proactive, inquisitive learner who thrives in a fast-paced, innovative setting.

Join the dynamic team at Perplexity AI as a Search Rust Engineer, where your expertise will drive the evolution of AI-powered search technologies. In this role, you will focus on optimizing every aspect of our search performance, ensuring that our systems are robust, scalable, and reliable.As a key player, you will:Design and enhance ultra-low-latency search infrastructure utilizing Rust programming.Profile and instrument services to continuously reduce response times as we scale.Develop and sustain distributed backend components that drive real-time search and retrieval.Work closely with product and infrastructure teams to craft systems that achieve exceptional query performance.Leverage advanced concurrency, memory management, and network programming techniques for optimal throughput.Monitor and fine-tune production workloads to maintain reliability under high traffic conditions.Participate in code reviews and mentor peers in high-efficiency Rust development practices.

Join our dynamic Crawler team at Perplexity as a Senior Backend Software Engineer. In this pivotal role, you will be responsible for designing, developing, and managing systems that handle the ingestion, processing, and management of vast web-scale data to support our cutting-edge search technologies. This is a high-impact engineering position that requires a blend of backend and frontend expertise within our data acquisition stack.Key ResponsibilitiesLead the development of large-scale web crawlers, ingestion pipelines, and data processing systems.Construct, maintain, and optimize vital backend and frontend components for crawler services, including storage solutions, data retrieval functions, and UI dashboards for effective data management.Work closely with Search and Infrastructure teams to ensure efficient and high-quality ingestion and processing of billions of web pages.Architect and implement full-stack features and scalable distributed systems capable of handling high loads and real-time data operations.Experiment with innovative approaches to rapidly enhance system performance, usability, and reliability.QualificationsAt least 5 years of software development experience with a solid understanding of data structures and algorithms in languages such as Python, C++, Rust, or Go.Experience in developing large-scale web crawlers is highly preferred.Demonstrated expertise in building, deploying, and optimizing high-load, distributed services.Strong knowledge of cloud infrastructure, particularly hands-on experience with Kubernetes (K8s) and AWS.A passion for writing clean, efficient, and scalable code.

Become a part of Perplexity AI as a Search Golang Engineer and play a crucial role in shaping the future of highly scalable, AI-driven search infrastructure. In this dynamic position, you will utilize your expertise in Golang to create, implement, and manage backend systems capable of efficiently processing millions of queries with unparalleled reliability.Responsibilities:Develop robust and scalable distributed backend services utilizing Golang.Design, enhance, and sustain search infrastructure to accommodate rapid traffic increases.Create cloud-native solutions focusing on horizontal scalability and quick failover capabilities.Establish comprehensive monitoring, autoscaling, and incident recovery mechanisms.Work closely with product, infrastructure, and DevOps teams to optimize throughput and system resilience.Lead improvements in CI/CD processes, automation, and operational excellence for backend systems.Mentor fellow engineers and advocate for scalable design principles throughout the organization.

Join the Future of Conversational Commerce!At Gorgias, we envision a world where conversations are the primary mode of shopping. We are developing an advanced platform featuring a unified AI agent designed to sell, support, and re-engage customers throughout their shopping journey. As pioneers in conversational commerce, we are shaping the future of eCommerce.Our mission is to transform every interaction between brands and their customers into meaningful relationships—personal, seamless, and intelligent. By leveraging deep product knowledge and cutting-edge AI technology, we strive to make shopping feel more natural, human, and connected than ever.To succeed, we are dedicated to:Quality: Ensuring conversations are authentic and aligned with brand identity.Experience: Offering a frictionless shopping experience from chat to checkout.Re-engagement: Fostering personal, one-on-one dialogues over intrusive marketing.The potential is immense. With AI revolutionizing purchasing behaviors, Gorgias is laying the groundwork for the next decade of eCommerce—where every brand has its own intelligent agent and every customer feels valued and understood.Become a part of our mission to realize the promise of conversational commerce!Potential Teams to JoinRealtime Communication Team: Responsible for the core ticket processing pipeline for Gorgias's helpdesk, managing real-time event distribution to internal applications (including our AI Agent) and third-party integrations while also developing voice and SMS channels.Messaging Team: Oversees the asynchronous messaging infrastructure within Gorgias, empowering agents to handle customer conversations across email, chat, and social platforms, serving as the gateway between Gorgias and the external world.Growth Team: Manages the customer journey from onboarding to billing, ensuring a smooth experience while safeguarding against fraud.In-App Analytics Team: Develops in-product analytics and real-time processing features, providing internal teams with enhanced tools and datasets.Streaming Infrastructure Team: Constructs a scalable data streaming platform, offering tools and guidelines for data propagation and aggregation across multiple availability zones.Your Role:Design: Create features, APIs, and models for 16,000 merchants and 12 million shoppers globally.Collaborate: Work closely with an engineering manager, product manager, and designer to drive projects forward.

At Databricks, we are dedicated to empowering data teams to tackle the world’s most challenging problems—whether it's revolutionizing transportation or advancing medical innovations. Our mission is to create and operate the leading data and AI infrastructure platform, enabling clients to harness deep data insights for improved business outcomes.Founded by visionary engineers, Databricks is on an exciting multi-year journey to develop the ultimate Data Intelligence Platform. We are building upon a robust foundation with the ambition to create significantly better products. Our aim is to reimagine every component to deliver the fastest, easiest, and most secure data platform suited for all data workloads.As a Backend Software Engineer, you will become a key member of not only the Belgrade site but also a pivotal team in our quest to realize the Lakehouse vision. You will engage in the complete development cycle and embody the core values of Databricks.

Join Our Innovative Team! We are excited to announce that our dynamic online marketplaces, tutti.ch and anibis.ch, are on the lookout for a talented Senior Backend Engineer to enhance our team. At SMG, we prioritize our people—discover more about our culture from your future hiring manager, Nikola Cvorovic. Your Role in Our Backend Team At tutti.ch/anibis.ch, we operate within stream-aligned product teams that utilize the SCRUM framework. Each team is composed of 2–3 Backend Engineers, a Product Owner, an Engineering Manager, Designers, and Mobile and Web Engineers. Collaboration is key as our teams work closely with Platform (infrastructure) and Data (BI) teams, with each product team responsible for a specific domain. As an engineer, you will take charge of design, implementation, deployment, and monitoring. We leverage Go-based backend services hosted on AWS with Kubernetes, serving over 300k users daily. Code review and deployment occur directly from GitHub. Our technology stack includes PostgreSQL, Elasticsearch, Redis, SendGrid (for emails), and Auth0 (for authentication). We ensure high test coverage with tools like Testify, including integration tests for databases, Redis, and Kafka.

Join easygo, an innovative Australian technology powerhouse, as we continue to expand our engineering footprint in Belgrade. We are on the lookout for a Senior Backend Engineer to become a vital part of our Data and Integration Infrastructure team, responsible for architecting and enhancing the platforms that drive our global offerings.About the TeamYou will collaborate with a talented engineering group dedicated to empowering product and service teams, particularly on Kick. Our team is focused on developing and sustaining foundational platform capabilities that support the core systems of Kick, enhancing reliability, consistency, and the overall developer experience.Our responsibilities include ownership of essential components such as event pipelines, schema governance, service gateways, and notification delivery systems. These elements guarantee that Kick’s services communicate effectively and that data transactions across the platform are accurate, observable, and primed for analytics.By delivering robust, well-architected platform foundations and templates, our team significantly influences how Kick is constructed and scaled, streamlining workflows, minimizing redundancy across teams, and establishing a solid base for reliable integrations and data-informed decision-making.Who We’re Looking ForWe seek a Senior Backend Engineer proficient in Go, who is passionate about building platform-level capabilities that empower engineering teams to operate more efficiently and securely.The ideal candidate will take pride in designing and maintaining dependable, scalable systems, understanding the crucial impact that strong platform foundations have on the success of a large, evolving organization.You should feel at ease working on core infrastructure and shared services, and possess a strong commitment to engineering excellence. You’ll value clean interfaces, well-defined contracts, and highly observable systems, approaching complex challenges in a pragmatic and thoughtful manner.As a senior engineer, you will be expected to:Independently tackle complex, high-impact projectsEngage meaningfully in technical discussions and architectural decisionsMentor and uplift others through code reviews, knowledge sharing, and teamworkIf you are motivated by enabling others and making a lasting impact, and if you thrive in environments where enhancing reliability, data quality, and developer experience is just as crucial as delivering new features, we want to hear from you!

Join Perplexity as a Search Quality Analyst and help us enhance our advanced search technologies. We are seeking a skilled data analyst who will leverage user behavior insights to optimize our A/B testing processes and improve our product offerings. This role involves identifying critical signals in user interactions and transforming data into actionable insights.Key ResponsibilitiesCreate data-driven insights from user interactions to guide our product strategy and boost user engagement.Develop and test hypotheses through the design, execution, and analysis of A/B tests.Define key performance metrics and visualizations for ongoing tracking and present them through interactive dashboards.Innovate new data pipelines to enhance search ranking quality, including discovering new signals, generating metrics, and creating data labeling frameworks that incorporate both human and LLM feedback.Required QualificationsMinimum of 4 years of experience in data analysis or a related field.Proven experience with search-related products, focusing on online metrics and A/B testing analysis.Strong proficiency in Python, with the capability to produce production-grade code.Expertise in SQL for data manipulation and analysis.Familiarity with Business Intelligence (BI) tools for data visualization.Solid understanding of statistical concepts and methodologies.Preferred QualificationsExperience with Apache Spark for big data processing.Familiarity with Databricks for collaborative data science.Experience in developing LLM-as-a-judge systems to enhance analytics.

P-1416 At Databricks, we are driven by a passion for empowering data teams to tackle some of the world's most complex challenges—ranging from revolutionizing transportation to accelerating medical innovations. We achieve this by developing and maintaining the premier data and AI infrastructure platform, enabling our clients to harness deep data insights to optimize their operations. Founded by a team of engineers, Databricks is on an ambitious journey to create the ultimate Data Intelligence Platform. While we are building on a robust foundation, our vision is to enhance every component to deliver a faster, more user-friendly, and secure data platform capable of handling diverse data workloads. As a software engineer, you will be a vital member of the inaugural Belgrade team and contribute significantly to our multi-year mission to realize the Lakehouse vision. You will engage in the end-to-end development lifecycle and embody the core values of Databricks. Your Impact: Our backend teams tackle a variety of challenges across our essential service platforms. You may work on: Complex issues spanning both product and infrastructure, including distributed systems, large-scale service architecture, monitoring, workflow orchestration, and enhancing developer experience. Building reliable, secure, and high-performance services and client libraries to manage and access vast amounts of data on cloud storage solutions like AWS S3, GCS, and Azure Blob Store. Contributing to product features that enable our customers to effortlessly store and retrieve their data. What We Seek: Bachelor's degree (or higher) in Computer Science or a related discipline. 8+ years of production-level experience in Java, Scala, C++, or similar programming languages. Proven experience in developing large-scale distributed systems. Experience with SaaS platforms or Service-Oriented Architectures. Solid understanding of SQL.

Renesas Electronics Corporation seeks a Senior Backend Software Engineer based in Belgrade. The position centers on developing and maintaining backend systems that power advanced technology initiatives. Role overview This engineer will work on backend infrastructure, ensuring reliability and scalability for ongoing projects. The work involves supporting complex technology solutions that require careful planning and execution. Collaboration Regular interaction with colleagues from various disciplines is expected. Teamwork and clear communication are important, as projects often span multiple areas of expertise.

About Unlimit Unlimit is a leading global fintech powerhouse, renowned for operating the largest proprietary payments infrastructure in the world.Established in 2009, Unlimit has expanded its reach across 17 international offices and employs over 700 experts. We integrate more than 1,000 payment methods into a unified platform, empowering businesses to scale across borders. Our comprehensive suite of financial tools encompasses payment processing, alternative payment solutions, multicurrency business accounts, card issuing, banking-as-a-service, and crypto on- and off-ramps.Our mission is to dismantle financial barriers, enabling seamless money movement globally. We equip innovative businesses with the resources to accept, send, and manage payments effortlessly, regardless of their location.About the RoleWe are in search of a proactive and experienced Senior System Administrator to oversee and support our on-premise IT infrastructure. This role is crucial in ensuring the high availability, security, and operational stability of our local systems. The ideal candidate will be structured, security-conscious, and adept at navigating a regulated fintech environment.

At CompStak, we are revolutionizing the commercial real estate industry by providing access to accurate and transparent data, enabling faster and more informed deals. Our platform aggregates hard-to-find information and makes it readily available for our members. Location: Belgrade, Hybrid (Currently, we operate three days per week in the office, subject to change)As a Senior Frontend Engineer, you will play a pivotal role in developing our Exchange & Enterprise applications, which are essential for our customers to search properties, analyze markets, and make data-driven decisions. You will be a key contributor to enhancing the user experience for thousands of users and will directly influence the performance and usability of our product.Join our small, experienced frontend team and help shape the main consumer-facing applications that empower our clients.

Renesas Electronics Corporation seeks a Senior Backend Software Engineer based in Belgrade. This role centers on designing, developing, and maintaining backend systems that power the company’s technology products. Key responsibilities Create backend architectures focused on high performance and reliability Build and maintain software components for backend services Collaborate with cross-functional teams to deliver technical solutions Improve existing systems to enhance scalability and efficiency Requirements Proven experience in building and maintaining backend systems Strong problem-solving abilities, with a focus on performance Ability to work effectively with colleagues from various disciplines This position provides opportunities to contribute to technology that supports Renesas products worldwide. Those who enjoy tackling complex backend challenges will find this role engaging.

At Perplexity, we are seeking a talented Senior or Expert C++ Developer to become an integral part of our dynamic Search Core team. This pivotal role involves shaping the future of our search technologies and products. You will influence major architectural, design, and implementation decisions that define our technical infrastructure.Key ResponsibilitiesDesign and develop innovative search index storage solutions that encompass both streaming and batch data processing systems, optimized for high-load environments with the capacity to manage billions of web pages.Create foundational core search components, including advanced algorithms for efficient data retrieval and ranking.Maximize hardware performance to ensure optimal system functionality.Address complex challenges related to multithreading, concurrency, and optimization at the system level.Enhance subsystems to ensure reliable and consistent data replication within the core search architecture.Required QualificationsA minimum of 5 years of hands-on experience in C++ programming.Familiarity with Python or other scripting languages.A strong commitment to writing clean, efficient, and scalable C++ code.In-depth knowledge of algorithms and data structures with practical application skills.Comprehensive understanding of multithreading, including various strategies, challenges, and trade-offs.Experience in developing high-load, distributed, and hardware-related services.Expertise in real-time systems development.Preferred QualificationsExperience in building core components for search engines, trading systems, or database management systems.Proficiency with cloud services, Kubernetes (k8s), and AWS infrastructure.

Join Databricks as a Senior Backend Software Engineer and be part of our pioneering team in Belgrade, Serbia. At Databricks, we are dedicated to empowering data teams to tackle some of the most pressing challenges across various industries, from revolutionizing transportation to accelerating groundbreaking medical discoveries. Our mission is to create and maintain the most advanced data and AI infrastructure platform, allowing our clients to leverage deep data insights for enhanced business outcomes.Founded by visionary engineers, Databricks is on a multi-year journey to develop the ultimate Data Intelligence Platform. While we have a solid foundation, our ambition is to innovate and enhance every aspect of our offerings, ensuring our customers experience the fastest, most user-friendly, and secure data platform for their diverse workloads.As a Senior Software Engineer, you will play a crucial role as a founding member of our Belgrade site, contributing significantly to our Lakehouse vision. You will engage in all phases of the development cycle while embodying the core values of Databricks.Your Impact:Our backend teams tackle a range of challenges across essential service platforms, including:Addressing complex issues related to product and infrastructure, such as distributed systems, scalable service architecture, monitoring, workflow orchestration, and enhancing developer experience.Designing reliable, secure, and high-performance services and client libraries for the efficient storage and access of vast amounts of data across cloud storage backends like AWS S3, GCS, and Azure Blob Store.Creating product features that enable our customers to effortlessly store and access their data.

At Perplexity, we are on the frontier of innovative search solutions, and we are looking for a talented Senior Machine Learning Engineer to join our dynamic team in Belgrade. Your expertise will play a pivotal role in developing the next generation of sophisticated search technologies, particularly in the areas of retrieval and ranking.Key ResponsibilitiesDrive continuous improvement in search quality using models, data, and advanced tools.Design and implement foundational components of our search platform and model architecture.Train and assess retrieval, ranking, and classification models, including Large Language Models (LLMs).Deploy models, ranging from boosting algorithms to LLMs, ensuring scalability and performance.Develop and refine Retrieval-Augmented Generation (RAG) pipelines for enhanced grounding and answer generation.Collaborate with cross-functional teams, including Data, AI, Infrastructure, and Product teams, to deliver high-quality results swiftly.Required QualificationsStrong grasp of search and retrieval systems, including principles of quality evaluation and associated metrics.Demonstrated success in working on large-scale search or recommendation systems.Self-motivated with a profound sense of ownership and execution.At least 5 years of relevant experience in search or recommendation system projects.

Join our dynamic team as a Senior Automation QA Engineer at Wargaming, where you will play a crucial role in ensuring the quality of our highly popular game, World of Warships. You will be responsible for designing and implementing automated tests, working closely with developers to enhance our testing frameworks, and collaborating with cross-functional teams to deliver a seamless gaming experience.

Role overview Renesas Electronics seeks a Senior Software Engineer in Belgrade to focus on platform development. The position involves designing and building software that supports and enhances Renesas products and services. This is a hands-on engineering role with an emphasis on technical quality and practical solutions. What you will do Develop and implement software for platform-level projects, contributing to the core technology stack. Collaborate with colleagues from various disciplines to deliver integrated solutions. Share ideas and technical expertise to improve and refine existing systems and processes. Team and culture The team values open collaboration and ongoing knowledge sharing. Members work together to advance technology and support each other's professional growth in a cooperative setting.