Senior Fullstack Engineer (React & Java/Kotlin)

Senior Fullstack Engineer (React & Java/Kotlin)

Miejsce pracy: Warszawa

Technologies we use

Expected

• Java
• Kotlin
• React.js
• TypeScript
• REST API
• Swagger
• OAuth 2.0
• OpenID Connect
• AI

This is how we organize our work

This is how we work

• at the client's site
• you focus on a single project at a time

Your responsibilities

• designing and developing APIs enabling integrations with external business partners,
• taking a technical lead in integration architecture and contributing to key architectural decisions,
• defining API contracts and following an API-first approach using OpenAPI / Swagger,
• developing backend services using Java and Kotlin,
• building modern web applications using React and TypeScript,
• defining and promoting software development standards and best practices,
• preparing and maintaining technical documentation,
• leading technical discussions and supporting the team in making sound engineering decisions,
• working with distributed systems and complex system integrations,
• participating in the on-call rotation.

Our requirements

• strong commercial experience with Java and Kotlin,
• proven experience designing, building, and maintaining REST APIs,
• hands-on experience with API-first design and OpenAPI / Swagger,
• very good knowledge of React and TypeScript,
• solid understanding of distributed systems and system-to-system integrations,
• practical knowledge of OAuth 2.0 and OpenID Connect,
• practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery,
• experience making architectural decisions and leading technical discussions,
• experience defining development standards and providing technical leadership within a team,
• strong communication and collaboration skills,
• English at min. B2 level,
• Polish at min. B1 level,
• willingness to visit the client's office in Warsaw 1–2 times per quarter.
• Work from Poland and a work permit are required.

Optional

• experience with data security and regulatory compliance, particularly GDPR,
• experience with B2B integrations and working with external business partners,
• 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.

What we offer

• Development budgets of up to 6,800 PLN,
• We fund certifications e.g.: AWS, Azure, ISTQB, PSM,
• Access to Udemy and Safari Books Online,
• Events and technology conferences,
• Technology Guilds,
• Internal training,
• Xebia Upskill,
• Private medical healthcare,
• MultiSport card - we subsidise a MultiSport card,
• Mental Health Support,
• Flexible working hours,
• B2B or employment contract,
• Contract for an indefinite period.

Development opportunities we offer

• assistance in preparation to public speeches
• conferences abroad
• conferences in Poland
• development budget
• industry-specific e-learning platforms
• intracompany training
• mentoring
• soft skills training
• support of IT events
• technical knowledge exchange within the company

Benefits

• sharing the costs of sports activities
• private medical care
• sharing the costs of foreign language classes
• sharing the costs of professional training & courses
• life insurance
• remote work opportunities
• flexible working time
• integration events
• corporate library
• no dress code
• video games at work
• coffee / tea
• drinks
• parking space for employees
• leisure zone
• employee referral program

Recruitment stages

• CV review
• HR Call
• Technical Interview
• Team/Client Interview
• Decision

Xebia sp. z o.o.

Xebia is a global AI-first, digital transformation, and engineering partner. With over 25 years of experience and a team of 5,000 professionals across 16 countries, we help organizations design and build scalable products, platforms, and data-driven solutions.

We specialize in Artificial Intelligence, Data and Cloud, Intelligent Automation, and Digital Products, combining deep technical expertise with a strong focus on engineering excellence and a people-first culture.

In the CEE region, we’re a team of nearly 1,000 experts delivering modern applications, data platforms, and AI solutions for clients such as McLaren, Aviva, Deloitte, Spotify, Disney, ING, UPS, Tesco, Truecaller, AllSaints, Volotea, Schmitz Cargobull, Allegro, InPost, and many, many more. We work with leading technologies including AWS, Azure, GCP, Databricks, and Snowflake, and combine strong engineering culture with a consulting mindset and a continuous focus on growth and knowledge sharing.

Administratorem Danych Osobowych jest Xebia sp. z o.o. z siedzibą we Wrocławiu przy ul. Suchej 3. Twoje dane zawarte w CV będziemy przetwarzać wyłącznie w celu prowadzenia procesu rekrutacji. Podstawą prawną przetwarzania Twoich danych jest art. 221 ust. 1 kodeksu pracy. Twoje dane osobowe będziemy przetwarzać do czasu zakończenia rekrutacji. Jeśli wyrazisz nam odrębną zgodę, będziemy przetwarzać Twoje dane również w procesie przyszłych rekrutacji, czyli do 36 miesięcy od przekazania tych danych. Masz prawo dostępu do treści swoich danych osobowych oraz prawo ich sprostowania, usunięcia, ograniczenia przetwarzania, prawo do przenoszenia danych, prawo wniesienia sprzeciwu, prawo do cofnięcia zgody na ich przetwarzanie w dowolnym momencie bez wpływu na zgodność z prawem przetwarzania, którego dokonano na podstawie zgody przed jej cofnięciem. W celu realizacji wymienionych praw należy przesłać e-mail z wybranym żądaniem na adres: Wyświetl e-mail na pracuj.pl. Jeżeli uważasz, że przetwarzamy Twoje dane niezgodnie z prawem, możesz złożyć w tej sprawie skargę do organu nadzorczego z siedzibą przy ul. Stawki 2 w Warszawie. Twoje dane możemy udostępniać tylko wtedy kiedy wyrazisz na to zgodę lub podmiotom uprawnionym, o ile zaistnieje taka konieczność. Twoje dane nie będą podlegały zautomatyzowanemu przetwarzaniu.