Senior Fullstack Software Engineer, Java, React

• Develop and evolve a distributed online platform based on microservices and micro-frontends
• Take end-to-end ownership of features across backend and frontend within the same service
• Build and maintain Java, Spring Boot, and Spring WebFlux backend services, REST APIs, and integrations
• Develop frontend functionality using React, TypeScript, JavaScript, HTML, and NPM
• Work with CMS-delivered content and content delivery services
• Implement new platform features and migrate legacy applications to modern architecture
• Refactor the codebase, reduce technical debt, and resolve long-standing technical issues
• Contribute to adoption of API standards including TM Forum Open APIs
• Deploy, operate, monitor, and troubleshoot containerized applications using Kubernetes and Docker
• Use AI coding agents and AI-assisted development workflows in daily engineering
• Contribute to improving AI-assisted development practices within the team
• Work on initiatives ranging from short tasks to larger projects
• Participate in knowledge transfer and maintain technical documentation
• Share technical knowledge with other developers

• Several years of professional experience developing modern web applications, with strong backend expertise and Senior-level independence
• Strong practical knowledge of Java 8+ and Spring Boot
• REST API design with JSON
• Understanding and hands-on experience with reactive programming, Spring WebFlux, Project Reactor, or comparable reactive stacks
• Frontend experience with React, TypeScript, JavaScript, HTML, and NPM
• Experience with JUnit, Mockito, WireMock, Git, JPA/Hibernate, XSLT, XPath, and XQuery
• Hands-on Kubernetes and Docker experience, including deployment, operation, monitoring, and troubleshooting
• Experience developing and evolving microservice-based and distributed systems
• Practical experience with AI-driven software development, such as GitHub Copilot, OpenCode, coding agents, context management, harness engineering, or spec-driven development
• Regular use of AI coding agents and ability to explain how they improve development workflows
• Ability to own features from design through production and make technical decisions in distributed architectures
• Proactive, analytical, quality-oriented, and continuous-improvement mindset
• Willingness to challenge existing approaches, contribute ideas, review code, share knowledge, and support developers
• Ability to work effectively in Agile, distributed, and international environments
• English and Polish, written and spoken, minimum B2
• Nice to have: micro-frontend architectures, Helm charts, Jenkins CI/CD, NEOS CMS, legacy migration, refactoring and technical debt reduction, distributed multinational and remote teams, BDD, and Playwright

• Fully funded training, certifications, and participation in technology conferences
• Flexible working hours
• Hybrid work model allowing time between home and offices in Polish cities
• Cafeteria system with personalized benefit options
• Referral bonuses of up to PLN 6,000
• Additional revenue-sharing opportunities for initiating partnerships with new clients
• Dedicated Team Manager guidance
• Tailored technical mentoring from an assigned technical leader
• Dedicated team-building budget for online and on-site team events
• Opportunities to participate in charitable initiatives and local sports programs
• Supportive and inclusive work culture emphasizing diversity and mutual respect