Middle Java Developer

O projekcie: Who We Are While Xebia is a global tech company, our journey in CEE started with two Polish companies – PGS Software, known for world-class cloud and software solutions, and GetInData, a pioneer in Big Data. Today, we’re a team of 1,000+ experts delivering top-notch work across cloud, data, and software. And we’re just getting started. What We Do We work on projects that matter – and that make a difference. From fintech and e-commerce to aviation, logistics, media, and fashion, we help our clients build scalable platforms, data and AI solutions, and cutting-edge applications to shape the future of tech. Our clients include McLaren, Aviva, Deloitte, Spotify, Disney, ING, UPS, Tesco, Truecaller, AllSaints, Volotea, Schmitz Cargobull, Allegro, InPost, and many, many more. We value smart tech, real ownership, and continuous growth. We use modern, open-source stacks, and we’re proud to be trusted partners of Databricks, dbt, Snowflake, Azure, GCP, and AWS. Fun fact: we were the first AWS Premier Partner in Poland! Beyond Projects What makes Xebia special? Our community. We support tech communities, organize meetups (Software Talks, Data Tech Talks), and have a culture that actively support your growth via Guilds, Labs, and personal development budgets — for both tech and soft skills. It’s not just a job. It’s a place to grow. What sets us apart?  Our mindset. Our vibe. Our people. And while that’s hard to capture in text – come visit us and see for yourself. Wymagania: - 3+ years of professional experience in backend development,- very good knowledge of Kotlin and Spring Boot,- openness to occasional visits to the Warsaw office (1–2 days per quarter),- hands-on experience with microservices architecture,- practical experience working with NoSQL databases, especially MongoDB,- experience building and maintaining backend systems and APIs,- understanding of system design and scalable architecture principles,- experience working with high-performance and high-scale systems,- strong analytical thinking and problem-solving skills,- ability to collaborate effectively with stakeholders and engineering teams,- good communication skills in English (B2) and Polish (C1),- practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery. Work from the European Union region and a work permit are required. Nice to have: - experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work, - Interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches. Codzienne zadania: - developing and maintaining backend systems for advertising and e-commerce platforms, - building low-latency, high-performance services processing large volumes of data, - developing scalable microservices and APIs using Kotlin and Spring Boot, - working on real-time event processing and advertising targeting mechanisms, - contributing to architecture design and system scalability improvements, - collaborating with stakeholders and supporting engineering best practices, including code reviews and code quality standards, - participating in technical readiness/on-call support for production incidents a few days per month.