Senior Full Stack React Java Engineer

Salary range: B2B - 40-45 E/h + VAT Ciklum is looking for a Senior Full Stack Engineer to join our team full-time in Poland. We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live. About the role: As a Senior Full Stack Engineer , become a part of a cross-functional development team engineering experiences of tomorrow. We are building a brand-new platform from the ground up, starting with a web portal and later expanding into mobile development. This is a hands-on, code-focused role where you will contribute across backend, frontend, and deployment. While you will collaborate on technical decisions, the primary focus is delivering high-quality code and end-to-end features. Responsibilities: Platform Development:  Build a new platform from scratch, ensuring scalability, performance, and maintainability. Backend: Develop and maintain backend services using Java with Spring Framework. Design and manage relational databases for robust data modeling. Frontend: Lead the UI/UX implementation for the web application. Build responsive, accessible, and performant user interfaces using React (Angular also acceptable). Collaborate with designers to translate wireframes and mockups into high-quality code. DevOps & Deployment: Deploy solutions on AWS and manage cloud infrastructure. Configure and maintain GitHub CI/CD pipelines. Testing: Perform unit testing; experience with integration, end-to-end, or performance testing is a plus. Collaboration: Work closely with design, product, and QA teams to deliver user-centric solutions. Requirements: Backend: Java with Spring Framework Frontend: React (preferred) or Angular Database: Relational databases (MySQL,  PostgreSQL , or similar) Cloud: AWS (EC2, S3, RDS, Lambda, etc.) DevOps: GitHub Actions / CI/CD Testing: JUnit, Jest, or similar frameworks Version Control: Git / GitHub Nice-to-Have: React Native (for future mobile development) Desirable: Experience with React Native for upcoming mobile initiatives AWS certification or strong cloud architecture expertise Familiarity with Scrum methodology Background in mobile development for future product expansion Prior experience in finance or fintech domains What`s in it for you? Strong community: Work alongside top professionals in a friendly, open-door environment Growth focus: Take on large-scale projects with a global impact and expand your expertise Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies Flexibility: Enjoy flexibility – full remote working possibilities Care: We’ve got you covered with company-paid medical insurance, mental health support, and financial & legal consultations About us: At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.With delivery centers in Wrocław and Gdańsk, our 300+ professionals in Poland drive forward-thinking solutions for global clients. Join a community where collaboration sparks innovation—and your impact reaches millions. Want to learn more about us? Follow us on  Instagram ,  Facebook ,  LinkedIn . Explore, empower, engineer with Ciklum Interested already? We would love to get to know you Submit your application. We can’t wait to see you at Ciklum.