Intern Software Engineer

🏢 Summary: Paid 10-week backend engineering internship focused on building and shipping features for scalable, distributed data systems used in production. The role involves working on APIs and data processing pipelines for Starburst Galaxy or Enterprise, contributing real code with direct impact. Interns collaborate with experienced engineers to solve performance and reliability challenges in modern backend environments. 🗂️ Requirements: Experience with Java, Interest in backend engineering, Ability to solve complex technical problems, Ability to work with distributed systems concepts, Availability for 10-week internship (June–August 2026), Rising Senior or recent graduate in relevant field 📃 Skills: Java, APIs, DistributedSystems, Backend, DataProcessing, Git 🏢 Description: About Starburst Starburst is the data platform for analytics, applications, and AI, unifying data across clouds and on-premises to accelerate AI innovation. Organizations—from startups to Fortune 500 enterprises in 60+ countries—rely on Starburst for fast data access, seamless collaboration, and enterprise-grade governance on an open hybrid data lakehouse. Wherever data lives, Starburst unlocks its full potential, powering data and AI from development to deployment. By future-proofing data architecture, Starburst helps businesses fuel innovation with AI. About the role Want to work on systems that actually matter ? At Starburst, our backend is the engine behind fast, scalable data access — and as an intern, you won’t be on the sidelines. You’ll join the team building Starburst Galaxy or Enterprise and start contributing from day one. Real code, real impact, real ownership. You’ll work on distributed systems, APIs, and data processing pipelines, learning directly from experienced engineers while solving problems that show up in production — not just in theory. We’ll support your growth, but we’ll also expect you to take initiative, move fast, and ship. This is a paid, 10-week internship (June 1st – August 28th, 2026). What you’ll do: Build backend features used by real customers Work on scalable, distributed systems Ship code early and often Learn modern backend technologies in practice Collaborate with engineers across different time zones Tackle real-world performance and reliability challenges What we’re looking for: You’re excited about backend engineering You’ve coded in Java You like solving hard problems You take ownership and get things done You’re curious and learn fast You’re a rising Senior or recent graduate Location Warsaw (hybrid)

🏢 Summary: Staff Data Engineer role focused on building and optimizing a high-quality data lake and analytics ecosystem using Starburst and Trino to drive product, telemetry, and business insights. The position involves developing scalable data pipelines, enabling AI-driven data access, and collaborating cross-functionally to deliver robust data products. The role emphasizes modern data architecture, cloud infrastructure, and strong software engineering practices. 🗂️ Requirements: Minimum 7 years of data engineering experience, Experience building and optimizing data pipelines with Trino, Spark, dbt, Experience managing data infrastructure in public clouds, Experience with orchestration tools such as Apache Airflow or Dagster, Fluency in SQL, Proficiency in Java, Python, or Scala, Experience building API integrations for third-party data extraction, Knowledge of modern data modeling techniques for data lakes, Experience with AWS services such as EMR, EC2, S3, IAM, Experience with Infrastructure-as-Code tools such as Terraform, Pulumi, or Ansible, Knowledge of RAG and AI design patterns, Strong software engineering practices including automated testing and code review 📃 Skills: Trino, Spark, dbt, SQL, Java, Python, Scala, Airflow, Dagster, AWS, EMR, EC2, S3, IAM, Terraform, Pulumi, Ansible, RAG, API, GCP, Azure 🏢 Description: About the role Starburst is looking for an experienced Data Engineer to build and enhance internal usage, telemetry, and product data analytics for both Starburst Enterprise and Starburst Galaxy.  This role focuses on using our own software to better understand our customers and how they use our products.  In addition, since data engineers are one of our key target personas, you will be able to provide valuable feedback to our teams as you use the products, in terms of performance, user experience, and integration with the larger data engineering ecosystem.  You’ll work closely with our dynamic, talented, global engineers while emphasizing quality and speed to insights. As a Staff Data Engineer at Starburst you will: Build and manage a high quality data lake to support various aspects of Startburst’s business, including product management, finance, customer support, and engineering. Find innovative ways to use Trino and Starburst to solve data management challenges Collaborate with technical leads, product managers and data analysts to build robust data products and analytics Leverage AI to democratize access to datasets for users throughout Starburst. Enable dataset preparation and model evaluation for Starbursts’ AI projects Define and adapt data engineering processes and best practices to focus on execution and getting reliable answers to important business questions Work closely with leaders from other teams and departments to iterate on both data architecture and design of data solutions, focusing on high-quality results accessible at several levels Envision innovative approaches to data management and work with Starburst’s product teams to bring those innovations to market. Some of the things we look for: At least 7 years of data engineering experience, and a clear passion for data and analytics Enthusiasm for working both independently and collaboratively with strong, diverse, high-performing teams to get value and insights from data Experience building and optimizing data pipelines using Trino, Spark, dbt, and related frameworks. Experience managing data infrastructure in public clouds. Experience using and managing orchestration frameworks such as Apache Airflow or Dagster. Knowledge of RAG and other design patterns for AI applications Fluency in SQL Experience building API integrations for extracting data from third party sources. Excellent coding ability in Java, Python or Scala. Knowledge of data modelling techniques which are appropriate for modern data lakes Experience with a variety of AWS services such as EMR, EC2, S3, and IAM.  Multi-cloud experience (GCP/Azure) is also nice to have. Able to use Configuration-as-Code and Infrastructure-as-Code tools such as Pulumi, Terraform, and/or Ansible. Demonstrable experience in delivering value and hitting deadlines consistently Has disciplined software engineering practices, including high code quality, extensive automated testing, and rigorous code review Highly proficient in both written and verbal communication, coupled with strong organizational abilities Ability to Travel : This role will require occasional in-person travel for purposes including but not limited to new hire onboarding, team and department offsites, customer engagements, and other company events. Actual travel expectations may vary by role and business needs. Where could this role be based? This role is based in our Boston offices and follows a hybrid model, with an expectation of being onsite 1-2 days per week. Starburst is dedicated to maintaining fair and equitable compensation practices. The salary range provided for this role reflects the minimum and maximum targets for candidates across all U.S. locations and could be inclusive of variable compensation, such as commission or bonus. All employees receive equity packages (ISOs) and have access to a comprehensive benefits offering. Actual compensation packages are determined based on relevant skills, experience, education and training, and specific work location. For more information, connect with the recruiting team or Hiring Manager during the process as they can provide more detailed information about the salary range. Build your career at Starburst All-Stars have the opportunity and freedom to realize their true potential. By building alongside top talent, we’re empowered to take ownership of our careers and drive meaningful change. Anchored in industry-proven technology and unprecedented success, All-Stars are taking on the challenge everyday to disrupt our industry –  and the future. Our global workforce is supported by a competitive Total Rewards program that reflects our commitment to a rewarding and supportive work environment. This includes a variety of benefits like competitive pay, attractive stock grants, flexible paid time off, and more. We are committed to fostering an intentional, inclusive, and diverse culture that drives deep engagement, authentic belonging, and an exceptional All-Star experience. We believe that diversity of thought, perspective, background and experience will enable us to own what we do, drive our success and empower our All-Stars to show up authentically. Starburst provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

🏢 Summary: Infrastructure Specialist role focused on developing and maintaining an internal benchmarking service for performance analysis, combining strong Java development with cross-cloud and Kubernetes-based infrastructure. The position involves building and operating benchmarking tools across multiple cloud environments and data analytics technologies. It emphasizes hands-on engineering work in a globally distributed team with minimal meeting overhead. 🗂️ Requirements: Commercial experience with Java development, Experience with software engineering and design best practices, Minimum 2 years of Infrastructure as Code experience (Pulumi or Terraform), Minimum 2 years of experience with Kubernetes, Minimum 2 years of experience managing AWS infrastructure, Experience designing and maintaining backend services, Ability to support and troubleshoot infrastructure and benchmarking systems 📃 Skills: Java, Kubernetes, Terraform, Pulumi, AWS, Trino, GCP, Azure 🏢 Description: About the role Starburst is looking for an Infrastructure specialist with strong Java development skills to work on our internal benchmarking tool for performance analysis. This is a great opportunity to deepen your expertise in a rapidly evolving technology and make a significant impact on leading a cross cloud, cross technologies tool that will allow developers and sales to analyze the performance of our products easily. This role will allow you to work on challenging problems around kubernetes deployments, Trino benchmarking driver, multiple cloud deployments and play with the leading data analytics products in the market. Responsibilities Design, develop and maintain our competitive analysis benchmarking service. Collaborate with your team members and other teams globally and operate in a fast paced environment We prioritize focused work, ensuring minimal time is spent in formal meetings, allowing you to concentrate on design, coding and PR reviews Being able to clearly articulate your ideas in writing across various communication channels like Slack, GitHub PRs, and Design Documents is essential in our globally distributed team Provide exceptional support for internal customers such as fellow engineers, sales and marketing. Some of the things we look for Software development experience with Java Demonstrated experience with software engineering and design best practices. At least 2 years of experience developing infrastructure as code, like Pulumi / Terraform. At least 2 years of experience developing infrastructure with Kubernetes. At least 2 years of experience with creating/managing AWS infrastructure. Appreciation for creating maintainable and high quality software as part of a fun, high-performing global team Intrinsic motivation for improving your software engineering craftsmanship Demonstration of ownership, grit, and bias for action - core values at Starburst. Bonus points Prior experience with additional cloud vendors such as GCP and Azure. Where could this role be based? This role is based in our Warsaw office and follows a hybrid model, with an expectation of being onsite 1-2 days per week.

🏢 Summary: Staff-level backend engineering role focused on designing and owning JVM-based services that orchestrate distributed compute engines (Spark, Trino) for enterprise environments. The position combines deep distributed systems development with Kubernetes-based infrastructure, AWS integrations, CI/CD ownership, and secure authentication implementation. It requires architectural leadership and long-term ownership of platform components. 🗂️ Requirements: 8+ years backend engineering experience, Strong expertise in Java, Production experience building JVM-based services, Experience designing and operating distributed systems in production, Hands-on Kubernetes experience (manifests or Helm), Strong Docker experience, Experience managing CI/CD for Java codebases, Practical AWS experience (S3, IAM, SSO), Experience designing RESTful APIs, Knowledge of OAuth2 or OIDC authentication mechanisms, Proven architectural leadership across multiple services 📃 Skills: Java, JVM, Spark, Trino, Kubernetes, Docker, AWS, S3, IAM, SSO, REST, OpenAPI, OAuth2, OIDC, CI/CD, GitHubActions, Jenkins, Prometheus, OpenTelemetry, Python, Helm 🏢 Description: About the role As a Staff Engineer on the Spark Job Manager and Starburst Enterprise team, you will own critical backend and platform components that orchestrate distributed compute (Spark, Trino) for enterprise customers. You will lead the design and implementation of JVM-based services and the surrounding infrastructure: Kubernetes deployments, Docker image strategy, CI/CD automation, AWS integrations, and secure enterprise authentication flows. This is a staff-level role requiring architectural leadership, cross-team influence, and long-term platform ownership. As a Staff Software Engineer at Starburst, you will : Own critical backend and platform components that orchestrate distributed compute (Spark, Trino) for enterprise customers. Lead the design and implementation of JVM-based services and the surrounding infrastructure, including Kubernetes deployments, Docker image strategy, CI/CD automation, AWS integrations, and secure enterprise authentication flows. Provide architectural leadership, cross-team influence, and long-term platform ownership. Some of the things we look for: Deep Backend Engineering & Distributed Systems: 8+ years of professional backend experience, with strong expertise in Java (primary and required) and production experience building JVM-based services. Experience designing and operating distributed systems in production. Working with Spark, Trino/Presto, or comparable distributed compute engines is a strong plus. Extensive experience designing and evolving RESTful APIs, including validation, error modeling, pagination, filtering, backward-compatible versioning, and OpenAPI documentation. Infrastructure & Operations: Hands-on production experience with Kubernetes (authoring manifests/Helm charts) and strong Docker experience (multi-stage builds, image optimization, security best practices). Experience owning CI/CD for complex Java codebases, using GitHub Actions (preferred) or Jenkins. Practical AWS experience with S3 (or S3-compatible object storage), IAM roles/policies, and AWS SSO. Familiarity with secure authentication mechanisms: OAuth2 / OIDC, token-based auth, and session management. Experience implementing Metrics (Prometheus preferred), Distributed tracing (OpenTelemetry), and structured logging for JVM services is a plus. Staff-Level Impact: Proven experience leading architecture across multiple services or systems. Demonstrated ability to drive cross-team RFCs, break down ambiguous problems, influence engineering standards, and raise the technical bar through code reviews and mentorship. Own long-term platform health, not just feature delivery. Highly Preferred Experience: Experience building job orchestration platforms. Experience working in enterprise / B2B environments. Strong Python skills for automation and tooling. Experience running systems in hybrid or on-prem environments. Collaboration on open-source projects is a strong plus. Ability to Travel : This role will require 25% in-person travel for purposes including but not limited to new hire onboarding, team and department offsites, customer engagements, and other company events. Actual travel expectations may vary by role and business needs. Where could this role be based? This role is based in our Warsaw office and follows a hybrid model, with an expectation of being onsite 2-3 days per week. Build your career at Starburst All-Stars have the opportunity and freedom to realize their true potential. By building alongside top talent, we’re empowered to take ownership of our careers and drive meaningful change. Anchored in industry-proven technology and unprecedented success, All-Stars are taking on the challenge everyday to disrupt our industry –  and the future. Our global workforce is supported by a competitive Total Rewards program that reflects our commitment to a rewarding and supportive work environment. This includes a variety of benefits like competitive pay, attractive stock grants, flexible paid time off, and more. We are committed to fostering an intentional, inclusive, and diverse culture that drives deep engagement, authentic belonging, and an exceptional All-Star experience. We believe that diversity of thought, perspective, background and experience will enable us to own what we do, drive our success and empower our All-Stars to show up authentically. Starburst provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

🏢 Summary: Senior Backend Engineer role focused on building and scaling backend systems for an AI-driven product that transforms complex government data into actionable insights. The position involves designing data ingestion, processing pipelines, and distributed infrastructure from scratch, with full ownership from architecture to production. You will work closely with a small senior team to deliver scalable, production-ready systems. 🗂️ Requirements: 6+ years of Backend Engineering experience, Experience in JVM ecosystem, Experience in product companies (B2B SaaS preferred), Experience designing and owning backend systems in production, Strong knowledge of system design and scalability, Experience building asynchronous or distributed systems, Ability to make and justify technical decisions, Fluency in English, Valid work authorization in Europe or LATAM 📃 Skills: Kotlin, Java, JVM, SQL, GCP, Messaging, Queues, DistributedSystems, SystemDesign, DataPipelines, LLMs, AI 🏢 Description: About the role We’re looking for a Senior Backend Engineer to join our early team and help build our product from zero to one. You’ll work on a product that helps companies navigate complex government data, from contracts and grants to market signals and turn it into actionable insights using AI. On the backend side, this means working on data ingestion, processing, and the infrastructure that powers search and AI-driven workflows at scale. You’ll collaborate closely with a small, senior team and have real ownership, from shaping solutions to shipping them to production and improving them over time. You might be a fit if you: Must have: 6+ years of experience as a Backend Engineer, preferably in the JVM ecosystem (we use Kotlin on the backend) Experience working in product companies (B2B SaaS preferred) with direct impact on shipped features Experience working in small companies or startups would be a strong advantage Experience designing and owning backend systems in production (from initial design to deployment and ongoing improvements) Strong understanding of system design, including scalability, failure handling, and trade-offs Experience building asynchronous or distributed systems (e.g. messaging, queues, event-driven systems) Ability to make and justify technical decisions, not just implement given solutions Fluency in written and spoken English Nice to have: Experience with large-scale data processing, scraping, or data pipelines Experience working with LLMs / AI-related systems Experience with GCP or similar cloud environments How We Work Build Bridges to Help Customers Win - We pride ourselves on being obsessively customer-centric. Shooting Star Speed - We move with extreme speed. We value momentum, decisiveness, and the ability to accelerate when it matters. Fun Is a Feature - Fun is a Feature means we intentionally design Starbridge to be an energizing place to do hard work. Joy, humor, and camaraderie make great teams faster, sharper, and more resilient. In the Arena - We believe the best ideas come from living close to the work, feeling the friction, hearing the nuance, and experiencing the details firsthand. Benefits include: Competitive salary + early-stage equity Unlimited PTO Regular off-sites (NYC + global locations) Interview Process We move fast — really fast. Getting back to someone today beats tomorrow, and our interview process reflects that mindset. Please keep us posted on your timeline so we can move quickly and speed things up where needed. After submitting your application, the team reviews your CV and statement of exceptional work. If your application passes this stage, you will be invited to a 30-minute interview during which a member of our team will make sure you're a good fit for the role. You will have the opportunity ask questions and learn more about the role as well. We'll then send you a programming challenge that consists of two parts: LeetCode and SQL. Beyond that step, you will enter the main process, which consists of three interviews: System design exercise hands-on. Live coding in Java/Kotlin. Product thinking and past work. All interviews will be conducted via Google Meet. Eligibility to Work in Europe or LATAM: Candidates must hold valid authorization to work in the country where they will be based. At this time, we are unable to offer visa sponsorship or assist with work permit applications.

🏢 Summary: 6-month Fullstack Software Engineer Internship focused on reviving and improving an existing web application using JavaScript and Java. The role involves contributing to frontend and backend development while following SDLC standards and best practices. Interns collaborate with senior engineers and gain hands-on experience with structured development processes. 🗂️ Requirements: Enrolled in Bachelor or Master degree in Computer Science or related field, Basic knowledge of JavaScript, Basic knowledge of Java and object-oriented programming, Understanding of web application architecture, Familiarity with Git and version control, Basic understanding of SDLC concepts, English proficiency B2+, Willingness to follow defined development processes 📃 Skills: JavaScript, Java, Git, SDLC, Agile, Scrum, OOP, APIs, Frontend, Backend 🏢 Description: About Webellian Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy. About the position We are seeking a Fullstack Software Engineer Intern to join our team for an internal project. The main mission of the internship will be to help revive and improve an existing application while following our internal Software Development Life Cycle (SDLC) standards and best practices. The intern will work with both JavaScript and Java, contributing to frontend and backend development. At the same time, this role has an important learning and feedback aspect: by working on a real, living system, you will help us verify whether our development procedures, documentation, and guidelines are clear, usable, and effective in practice. This role is ideal for a young, motivated fullstack developer who wants to learn how software should be built “by the book” — where processes are meant to guide and support engineers, not require expert-level project management skills to understand. Key Responsibilities Contribute to frontend and backend development using JavaScript and Java Help restore, improve, and extend the existing application Follow internal SDLC guidelines, development procedures, and documentation Provide feedback on the clarity and usability of development processes and documentation Collaborate with senior engineers to understand best practices and architectural decisions Assist in debugging, fixing issues, and improving code quality Participate in code reviews and knowledge-sharing sessions Help identify gaps or unclear areas in development procedures and suggest improvements Requirements: Being enrolled in a Bachelor or Master degree in computer science, software engineering, or a related technical field Good English communication skills (B2+), Polish language is a plus Basic knowledge of JavaScript (frontend or backend) Basic knowledge of Java and object-oriented programming Basic understanding of web application architecture (frontend, backend, APIs) Familiarity with Git and version control systems Basic understanding of software development life cycle (SDLC) concepts Willingness to follow defined processes, guidelines, and documentation Analytical mindset and attention to detail Curiosity and willingness to ask questions and learn Independence and drive to grow as a software engineer Any academic, personal, or internship experience with fullstack development is considered an asset Familiarity with Agile/Scrum methodologies is a plus *As an intern, you’re not expected to be an expert. What is really important is your will and ability to expand your skills during the internship and contribute actively to the company. What we offer: 6 month internship Opportunity to work with excellent professionals, in a professional and friendly environment High standards of work and focus on the quality of code New technologies in use Continuously learning and growth International team Pinball, PlayStation & much more (on-site) About you: Open-minded and eager to learn Autonomous and not afraid to ask questions Business oriented and looking to bring solutions Capable of detailed and analytical thinking Ready to take responsibilities and have an impact on companies’ projects BE BOLD In your CV, please include the following information: Why would you like to join us? Do you have something to share with us? (portfolio, projects, ideas, …)

🏢 Summary: Principal Software Engineer role focused on leading the design and architecture of a scalable interior decor visualization platform integrating high-performance data pipelines and machine learning. The position involves building and overseeing complex backend systems that support large-scale 3D and visualization experiences. The engineer will drive technical excellence across cross-functional teams and ensure reliability and fault tolerance at scale. 🗂️ Requirements: 8+ years of experience building scalable and reliable systems, Expert-level proficiency in Python, Expert-level proficiency in Kubernetes, Expert-level proficiency in PostgreSQL, Expert-level proficiency in AWS, Strong hands-on experience with Django, Proven experience with complex ETL flows, Experience with high-throughput systems, Deep understanding of algorithms, Deep understanding of data structures, Deep understanding of networking, Deep understanding of databases, Experience designing fault-tolerant systems at scale 📃 Skills: Python, Kubernetes, PostgreSQL, AWS, Django, ETL, Algorithms, DataStructures, Networking, Databases 🏢 Description: We are looking for a Principal Software Engineer to join our team and work on an innovative interior decor visualization platform. You can become part of a team of over 300 experts in the AdTech domain by joining our Stellar team. What is Stellar? It’s a community, a network, and a dedicated business unit within Sigma Software that specializes in advertising technology solutions. Over the years, we’ve had the opportunity to work with some of the largest AdTech companies in the world. We’ve helped tons of AdTech startups transform from ideas into thriving businesses. Since 2008, we’ve been working with advertising technology businesses to help them envision, build, and support their technology. Project The project is an advanced interior decor visualization platform that allows customers to preview furniture and decor items in their home environment before purchasing. Imagine being in a store and instantly seeing how a sofa, carpet, or other items fit into your interior design — this solution makes it possible. The system integrates high-performance data pipelines, machine learning models, and visualization tools to deliver a seamless user experience. Requirements 8+ years of IT experience building scalable and reliable systems Expert-level skills in Python, Kubernetes, PostgreSQL, AWS Strong hands-on experience with Django Proven expertise in complex ETL flows and high-throughput systems Deep understanding of algorithms, data structures, networking, and databases Experience designing fault-tolerant systems at scale Advanced level of English Would be a plus Background in computer vision or 3D graphics Familiarity with microservices architecture Experience with real-time rendering systems Knowledge of CI/CD pipelines and DevOps practices Personal Profile Strong leadership and mentorship skills Strategic thinker with an ownership mindset Excellent communication and collaboration abilities Passion for innovation and engineering excellence Adaptability to fast-paced project environments Responsibilities Lead cross-functional initiatives across multiple engineering teams Drive the design and architecture of complex backend systems supporting large-scale 3D and computer vision experiences Partner with product and engineering leadership to translate business needs into actionable engineering plans Conduct architecture reviews and ensure adherence to engineering excellence practices Mentor senior engineers, fostering technical growth and leadership skills Ensure backend systems are scalable, reliable, and fault-tolerant Oversee integration of high-throughput ETL flows and data processing pipelines Collaborate closely with frontend and 3D teams to deliver seamless user experiences

🏢 Summary: Frontend Engineer role focused on building enterprise AI applications using Next.js, React, and TypeScript in a fully on-site Warsaw office environment. The position involves developing real-time AI interfaces, managing complex frontend state, improving performance and accessibility, and contributing to technical decisions. Candidates will work with modern AI development tools and enterprise-scale frontend systems. 🗂️ Requirements: 3–5 years of frontend engineering experience, Strong knowledge of React, Strong knowledge of TypeScript, Strong knowledge of Next.js, Experience building production Next.js applications, Understanding of SSR, SSG, and CSR, Experience with complex state management, Experience with real-time updates and optimistic UI, Experience building AI or LLM-based interfaces, Understanding of frontend performance and Core Web Vitals, Knowledge of accessibility and localization, Security-focused development approach, Experience using AI coding assistants, Good communication skills, Ability to work fully on-site in Warsaw 📃 Skills: React, TypeScript, Next.js, SSR, SSG, CSR, AI, LLM, CoreWebVitals, Localization, Accessibility, Security, GitHubCopilot, OpenAI, Claude, ReactFlow, Highcharts, RAG, MCP, DSPy, Node.js, Python 🏢 Description: Please note: This role requires working from our office in Warsaw city centre 5 days a week . This is a fully on-site position , and remote or hybrid work is not available . About us We believe that businesses are moving toward AI-powered work, and we are building a platform for this future. Many AI agents cannot handle complex business tasks. We created a platform that organizes company policies, workflows, and business knowledge into one AI data model. This helps AI agents make accurate decisions and deliver reliable results at scale. We already work with well-known enterprise customers such as Glovo, Nespresso, and HelloFresh. Our platform supports thousands of users and processes real production data. Customers trust us with important business knowledge because we provide a secure and reliable solution with SOC2, HIPAA-ready security practices, and strong integrations. Job description We are looking for a frontend engineer with several years of experience who wants to build user interfaces for enterprise AI products. You will help create applications that allow users to work with AI systems in a simple and reliable way. You will build production applications using Next.js, work with complex application state, real-time AI features, and modern frontend technologies. Over time, you will also take part in important technical decisions. The position is based in Warsaw and requires working from the office. Responsibilities Build and deliver production Next.js applications with complex state management and real-time AI features. Create user interfaces for AI-powered tools, including streaming AI responses, semantic search, knowledge graphs, and AI agents. Help improve our component library and design system to keep the UI consistent, reusable, and accessible. Develop enterprise features such as localization, accessibility, browser compatibility, and security. Monitor applications after release, improve performance, reduce bundle size, and track Core Web Vitals. Use AI tools every day to improve development speed and internal frontend workflows. Maintain high code quality through testing and code reviews. Requirements Around 3–5 years of experience as a frontend engineer. Strong knowledge of React, TypeScript, and Next.js. Experience building production Next.js applications and understanding the differences between SSR, SSG, and CSR. Good experience with state management, including real-time updates, optimistic UI, and multi-tenant applications. Experience building AI or LLM-based interfaces such as chat applications, streaming responses, or semantic search. Good understanding of frontend performance, Core Web Vitals, and user experience. A security-focused approach and knowledge of accessibility and localization. Experience using AI coding assistants as part of your daily development work. Good communication skills and the ability to explain technical decisions clearly. Nice to have Experience with React Flow, Highcharts, or other data visualization libraries. Experience building vector search, RAG, or semantic search interfaces. Knowledge of MCP, DSPy, or other modern AI frameworks. Basic understanding of Node.js or Python backend development. Contributions to design systems or open-source UI libraries. What we offer B2B contract and company stock options. MacBook Pro. Modern technology stack and the opportunity to contribute to open-source projects. An AI-focused development environment with tools such as Claude Code, OpenAI Codex, and GitHub Copilot. Our values Our leadership team has strong experience in AI, knowledge management, and enterprise SaaS. We have received more than $60 million in funding and have been recognized by Gartner as a Cool Vendor. Our work is guided by these values: Quality – We care about excellent work and high standards in everything we build. Momentum – We take initiative, share ideas, and keep moving forward. Accountability – We take responsibility for our work and give honest, respectful feedback. Hard work – We believe success comes from teamwork, dedication, and consistent effort. Learning agility – We stay curious, learn from mistakes, and continue improving. Adapt and thrive – We welcome change and see challenges as opportunities to grow. Win together – We work as one team, communicate openly, and support our shared goals.

🏢 Summary: Fullstack Engineer role focused on building and scaling a global data-driven insights platform using modern JavaScript technologies. The position involves developing backend and frontend services, designing scalable databases, and influencing system architecture. You will work on high-load systems, ensure code quality, and contribute to technical decisions and mentoring. 🗂️ Requirements: 5+ years of experience with JavaScript and Node.js, 3+ years of experience with TypeScript and React or Next.js, Hands-on experience with scalable backend systems, Experience designing SQL and NoSQL database schemas, Ability to optimize queries for high-load systems, Knowledge of web fundamentals and networking concepts, Understanding of OWASP security best practices, Experience with AWS cloud services, Experience writing unit, integration, and e2e tests, Professional proficiency in English 📃 Skills: JavaScript, Node.js, TypeScript, React, Next.js, REST, GraphQL, SQL, NoSQL, AWS, CORS, OWASP, Microservices, Serverless 🏢 Description: We’re building a data-driven insights platform used by professionals worldwide. Our mission is to turn complex data into actionable insights and empower teams to make better decisions. We value ownership, technical excellence, and collaboration . If you enjoy building scalable systems, mentoring engineers, and shaping software architecture, you’ll fit right in. 🎯 Your mission Develop and maintain backend and frontend services (REST/GraphQL APIs, React apps) Design scalable database schemas (SQL & NoSQL) and optimize queries for high-load systems Collaborate with product, design, and DevOps teams to deliver robust solutions Write clean, tested code (unit, integration, e2e) Influence architecture and technical decisions Mentor other developers and share best practices 📌 You should have 5+ years in JavaScript / Node.js 3+ years in TypeScript + React/Next.js Hands-on experience with scalable backend systems Knowledge of web fundamentals & networking (CORS, browser behavior) Understanding of security best practices (OWASP) Experience with cloud services (AWS preferred) Strong communication skills in English Ability to work independently and take ownership ✨ Nice to have Experience with microservices / serverless architectures Data pipelines, scraping, or data-heavy applications Team leadership or mentoring experience Exposure to AI/ML integrations 💡 Why join us High-impact role on a global data platform Work with modern technologies and best engineering practices Autonomy & ownership in your work Collaborative and experienced team Competitive employment package and benefits.

🏢 Summary: Principal Software Engineer role focused on leading the architecture and development of a large-scale interior decor visualization platform. The position involves designing scalable backend systems, high-throughput data pipelines, and supporting 3D and computer vision experiences. The engineer will drive cross-team technical initiatives and ensure system reliability and performance at scale. 🗂️ Requirements: 8+ years of experience building scalable and reliable systems, Expert-level proficiency in Python, Strong hands-on experience with Django, Expert-level knowledge of Kubernetes, Expert-level knowledge of PostgreSQL, Expert-level knowledge of AWS, Proven experience with complex ETL flows, Experience with high-throughput data processing systems, Deep understanding of algorithms and data structures, Strong knowledge of networking and databases, Experience designing fault-tolerant systems at scale 📃 Skills: Python, Django, Kubernetes, PostgreSQL, AWS, ETL, Algorithms, DataStructures, Networking, Databases, Microservices 🏢 Description: We are looking for a Principal Software Engineer to join our team and work on an innovative interior decor visualization platform. You can become part of a team of over 300 experts in the AdTech domain by joining our Stellar team. What is Stellar? It’s a community, a network, and a dedicated business unit within Sigma Software that specializes in advertising technology solutions. Over the years, we’ve had the opportunity to work with some of the largest AdTech companies in the world. We’ve helped tons of AdTech startups transform from ideas into thriving businesses. Since 2008, we’ve been working with advertising technology businesses to help them envision, build, and support their technology. PROJECT The project is an advanced interior decor visualization platform that allows customers to preview furniture and decor items in their home environment before purchasing. Imagine being in a store and instantly seeing how a sofa, carpet, or other items fit into your interior design — this solution makes it possible. The system integrates high-performance data pipelines, machine learning models, and visualization tools to deliver a seamless user experience. Responsibilities Lead cross-functional initiatives across multiple engineering teams Drive the design and architecture of complex backend systems supporting large-scale 3D and computer vision experiences Partner with product and engineering leadership to translate business needs into actionable engineering plans Conduct architecture reviews and ensure adherence to engineering excellence practices Mentor senior engineers, fostering technical growth and leadership skills Ensure backend systems are scalable, reliable, and fault-tolerant Oversee integration of high-throughput ETL flows and data processing pipelines Collaborate closely with frontend and 3D teams to deliver seamless user experiences Qualifications 8+ years of IT experience building scalable and reliable systems Expert-level skills in Python, Kubernetes, PostgreSQL, AWS Strong hands-on experience with Django Proven expertise in complex ETL flows and high-throughput systems Deep understanding of algorithms, data structures, networking, and databases Experience designing fault-tolerant systems at scale Advanced level of English WOULD BE A PLUS Background in computer vision or 3D graphics Familiarity with microservices architecture Experience with real-time rendering systems Knowledge of CI/CD pipelines and DevOps practices PERSONAL PROFILE Strong leadership and mentorship skills Strategic thinker with an ownership mindset Excellent communication and collaboration abilities Passion for innovation and engineering excellence Adaptability to fast-paced project environments