Backend Software Engineer at Databricks | Belgrade, Serbia

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 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.

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 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.

Join Perplexity as a Search Machine Learning Engineer Intern and contribute to the development of cutting-edge search technologies focused on retrieval and ranking. Collaborate with seasoned engineers to enhance search quality, experiment with innovative models, and deploy features that significantly affect user interactions with information discovery.Our internship program spans 12 to 24 weeks, requiring full-time, in-person attendance at our Belgrade office.Key Responsibilities:Participate in experiments aimed at enhancing search quality through advanced models, optimized data utilization, and effective evaluation tools, under the mentorship of senior engineers.Design and develop components of our search platform and model stack, including retrieval, ranking, and classification models.Train and evaluate models, including those based on LLM approaches, for various tasks related to retrieval, ranking, and classification.Assist in the deployment and monitoring of search and ranking models to ensure scalability and performance.Contribute to the development and iteration of RAG pipelines for grounding and answer generation.Collaborate with Data, AI, Infrastructure, and Product teams to quickly implement improvements while learning best practices in production machine learning.

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.

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.

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 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.

Join Perplexity as a Product Data Scientist, where you will play a pivotal role in advancing our cutting-edge search technologies. Your expertise in analyzing user behavior will be instrumental in extracting valuable insights from A/B testing data, enabling us to refine our products and enhance user satisfaction.Key ResponsibilitiesGenerate actionable data-driven insights from user interactions to shape our product strategy and promote user adoption.Develop and validate hypotheses by designing, executing, and interpreting A/B testing methodologies.Identify key performance metrics and create visual dashboards for effective tracking and reporting.Architect new data pipelines to enhance ranking quality, including the discovery of new signals, metric production, and the development of data labeling pipelines utilizing human and LLM feedback.

Job OverviewJoin Wargaming's dynamic Analytics team as a dedicated Data Engineer. This role demands a proactive mindset, a passion for data, and a results-driven approach. As a Data Engineer, you will harness your technical expertise in high-load telemetry and data warehousing while collaborating effectively across teams.Your work will involve analyzing diverse product data, from financial metrics to detailed in-battle telemetry, capturing player actions, vehicle movements, and interface events. All insights are consolidated into a centralized data warehouse for near real-time analytics.Collaboration is key, as you'll work closely with the Data Warehouse team and a global community of over 50 analysts. This position offers the chance to thrive in a data-centric industry and leverage modern analytics technologies for tangible product outcomes.

Join the Wargaming team as a QA Engineer for our acclaimed game, World of Warships, on PC. In this role, you will play a crucial part in ensuring the quality and performance of our game through rigorous testing and analysis. Collaborate with a talented team to identify and resolve issues, contributing to the overall player experience.

Are you enthusiastic about databases and have a talent for troubleshooting? Do you thrive on empowering others to harness the full potential of their data? At DBeaver, we strive to weave data into the daily routines and decision-making processes of individuals everywhere. Our vibrant community of over 10 million active users globally continually motivates our work, driving our open-source innovation. As the premier provider of cross-platform enterprise data and database solutions, DBeaver is looking for a dedicated Sales Engineer to join our European team. In this role, you will serve as a pivotal link between our sales team and clients, utilizing your technical knowledge to help potential customers recognize how DBeaver’s offerings can alleviate their technical challenges and align with their objectives. Location: This position is available for remote work across Europe or as a hybrid role in our offices located in Belgrade, Serbia, or Budapest, Hungary.

Join our vibrant team at Telesign as a Cloud DevOps Engineer where you will be instrumental in shaping and managing our cloud infrastructure. Your expertise in Amazon Web Services (AWS) will help us maintain scalability, reliability, and security in our applications. If you are enthusiastic about harnessing cloud technologies and automating processes to drive continuous improvement, we want to hear from you! Take the next step in your career by applying today and become part of our innovative team! Key Responsibilities: Cloud Design and Management: Architect, provision, and maintain high-performing and scalable distributed systems on AWS. Lead implementation with your technical expertise and guidance. Automation, GitOps & CI/CD: Create and support CI/CD pipelines to automate the deployment and testing of infrastructure and components. Monitoring & Performance: Develop robust monitoring and alerting systems to ensure cloud environment availability and performance, while administering systems and identifying optimization opportunities. Security & Compliance: Ensure that our cloud infrastructure meets security and compliance standards in line with industry best practices. Collaboration: Partner closely with development teams, product managers, security, and operations to streamline application delivery. Cost Optimization: Evaluate cloud infrastructure costs and recommend strategies to reduce expenses. Documentation: Keep detailed architectural documentation, including design specs and guidelines, to support implementation and knowledge sharing.

Mainstream is the leading cloud provider in Southeast Europe. The Managed Application team in Belgrade focuses on keeping clients’ web services running smoothly through advanced managed cloud solutions. As a DevOps Cloud Engineer, you will help turn innovative ideas from companies in many industries into working solutions. Role Overview This position centers on supporting and enhancing the performance of enterprise systems and applications. The team works on a variety of projects, such as launching new websites, migrating retail chains to the cloud, and delivering managed services for clients like Remiks, Fashion Company, and FitPass. The work brings continual learning as new tools and platforms are adopted, always aiming for high-availability and reliability to meet demanding client needs. What You Will Do Set up and maintain Linux servers using automation tools like Terraform and Ansible. Monitor server performance to catch issues early and keep enterprise systems running at their best. Deliver L2 support to clients, identifying and solving complex technical problems quickly and effectively. Adopt new cloud platforms and DevOps practices, always seeking ways to improve performance, security, and stability. Work closely with team members to tackle unexpected challenges and develop strong solutions. Support digital and AI transformation projects through your technical contributions. Location This role is based in Belgrade, Serbia.

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.

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.

Speechify seeks a Software Engineer for its iOS Core Product team in Belgrade, Serbia. This position focuses on building and enhancing features that define how users interact with Speechify on iOS devices. Role overview As part of the iOS Core Product group, the engineer will play a key role in shaping the mobile experience. The work involves both developing new features and refining existing ones, always with the goal of improving usability and performance for Speechify users. What you will do Develop and improve features for the iOS core product Work closely with team members to deliver updates that enhance user experience Support the ongoing evolution of Speechify’s technology for content consumption Location This role is based in Belgrade, Serbia.

Join Databricks as a Senior Applied ML/AI Engineer, where you will leverage cutting-edge machine learning and optimization algorithms to enhance the functionality and performance of our AutoML products and other user-facing solutions. Your expertise will drive advancements in classification, regression, forecasting, and recommendation systems, utilizing both traditional methods and deep learning techniques. The Applied ML/AI team tackles some of the most challenging and fascinating issues businesses face today, aiming to maximize the efficiency and effectiveness of Databricks’ infrastructure and products.Your Impact:Collaborate within a small, skilled team of engineers and data scientists to build features and implement end-to-end systems.Influence the direction of our applied ML initiatives by partnering with engineering and product teams across the organization.Lead the design and deployment of advanced ML/AI models and systems that enhance Databricks’ product capabilities and operational performance.Create and maintain robust, scalable ML infrastructure, including components for model training and serving, ensuring seamless integration of AI/ML solutions into production environments.Research and develop innovative modeling techniques in machine learning for forecasting.Engage with the broader AI community through conference presentations and contributions to open-source projects, establishing Databricks as a leader in the industry.