898 backend developer English-speaking jobs in Warsaw

This is a high-ownership role for a strong mid-level backend engineer. ... We are looking for a Backend Engineer II to join our Technology Team and help build the future of education ... Strong experience with TypeScript/Node.js, Python or similar modern backend technologies. ... Improve reliability, observability, performance and maintainability across backend systems. ... What you will do Build and maintain backend services, APIs, webhooks and integration services.

About the role As a Senior Backend Engineer, you will play a crucial role in designing, developing, and ... Requirements 5+ years of experience in software engineering with a focus on backend, distributed systems

Qualifications You have 7+ years as a Backend developer using Java (Java 11 through Java 21+) You have ... experience leading and mentoring backend engineers, providing guidance and direction on best practices

velocity of all City’s Experience product teams by building and maintaining a robust, self‑service developer ... shifting toward TypeScript and JavaScript, though you will also work with Java/Kotlin for specific backend ... Professional experience or solid comfort levels with Java or Kotlin is required to support critical backend

Drive architectural decisions and establish patterns that support scalability, reliability, and developer ... About the Role We are looking for a Senior Backend Engineer to architect and build the core systems of ... Must Haves 5 years of software development experience building scalable systems (backend programming

the success of our clients, consultants, and partners.About projectWe are looking for an AI/Python Developer ... professional experience with Python, demonstrating deep expertise in designing, building, and optimizing backend ... relevance and efficiency for LLMs and AI agents.Solid understanding of APIs, microservices, and distributed backend

We are currently in search of a proficient expert to join us as a Full-Stack C# Developer. ... the development and maintenance of applications running various platforms, with a notable focus on backend ... languages and libraries such as HTML/CSS, as well as JavaScript, and frameworks like Node.jsStrong backend

Collaborate with backend engineers. Work with relational and document databases. ... technologies-optional : PostgreSQL MongoDB Prisma Drizzle ORM Docker about-project : We are seeking a Frontend Developer

Measure and continuously improve developer productivity and code quality through AI‑driven workflows. ... What You’ll tackle in the first 6-12 months Lead the effort to break our backend and frontend out of ... What You’ll do Build Critical Systems Own the architecture of key backend and frontend systems within ... Who You Are 12+ years of professional software engineering experience across backend and frontend. 5 ... Set up frameworks for effective cross‑site, cross‑functional collaboration between backend and frontend

In this role, you will design and maintain robust backend services and high-volume API integrations in ... domain where transactional integrity and money flows are critical.Position OverviewWe are looking for a Backend ... shapingRequirementsStrong experience with Ruby (beyond Ruby on Rails)Proven track record of delivering backend ... RedisDockerAWS services (EC2, S3, RDS)Infrastructure-as-Code toolsResponsibilitiesDesign and implement robust backend

Join our vibrant team in Warsaw as a Senior Backend Engineer and be a part of something extraordinary ... As a Senior Backend Engineer, you will accelerate feature delivery for Breitling’s e‑commerce platform ... You will fit well to our squad if: You have 5+ years of professional backend engineering experience

Measure and continuously improve developer productivity and code quality through AI‑driven workflows. ... What You’ll tackle in the first 6‑12 months Lead the effort to break our backend and frontend out of ... What You’ll do Build Critical Systems Own the architecture of key backend and frontend systems within ... Who You Are 12+ years of professional software engineering experience across backend and frontend. 5 ... Set up frameworks for effective cross‑site, cross‑functional collaboration between backend and frontend

Experience building internal platforms, shared frameworks or developer productivity tooling, with a strong ... We are looking for a highly experienced Staff Backend Engineer to help lead the design, development and ... Strong backend expertise in Java (preferably 21+), with a solid understanding of JVM internals, concurrency ... SKILLS Proven experience designing, building and operating distributed systems at scale, owning complex backend

Continuously improve system performance, UX, and developer workflows. ... Define technical architecture for both frontend and backend systems, ensuring scalability and stability

We are looking for a Senior Full Stack Developer with strong architectural mindset for our client, one ... development.ResponsibilitiesTake ownership of solution design and support architectural decisions across frontend and backend

About the roleWe are looking for a Senior Backend Engineer to maintain and evolve the backend platform ... professional software engineering experience.Strong hands‑on experience with Node.js and TypeScript backend ... existing production system independently.What you will doBuild, maintain, and improve Node.js/TypeScript backend ... development.Experience building and maintaining REST APIs, serverless services, and backend integrations.Strong

Python Backend / Fullstack Architect - E-commerce Migration ProjectFor our international client, RED ... is currently looking for Python Backend and Fullstack Developers to join a large-scale e-commerce transformation

Working closely with Backend Engineers, QA Engineers and TA Engineers.

Backend Engineer will develop and maintain new features for the Saily product, focusing on personalization, A/B testing, and analytics. Requires 4+ years of product experience, proficiency in Go, and experience with K8s, microservices, SQL, and NoSQL databases.

Core Requirements Over 4 years of experience in backend development. ... Experience working with any of the following backend languages: PHP, Python, C#/.NET, Java, Kotlin. ... Tools You Will Use Backend: Go, MySQL, Kafka, Docker, Kubernetes, AWS, Redis Frontend: Next.js, React.js