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July 14, 2026
Fullstack Developer
Senior • Hybrid
Poznan, Poland
We are building a cloud-native MES as a SaaS product on Google Cloud. To scale our product, we’re looking for a Fullstack Developer with a clear backend focus. As part of a cross-functional Scrum team, you’ll take ownership of high-quality business functionality while contributing to the backend to deliver seamless end-to-end features.
Key Responsibilities
- Take ownership of end-to-end feature development together with the Scrum team - from conception to deployment
- Drive backend-heavy features while still contributing to frontend implementation where needed to deliver complete solutions with the team
- Design, implement, and maintain our backend components using Quarkus, while designing the core processes in BPMN
- Participate in architecture discussions and technical decision-making
- Design solutions with scalability, security, and operational aspects in mind
- Work with containerized applications orchestrated by Kubernetes
- Mentor other developers and strengthen engineering practices in the team
Required Qualifications
- Several years of experience in software development
- Strong expertise in backend development with Java 21+ and frameworks like Quarkus or Spring Boot (preferably Quarkus)
- Solid understanding of backend and cloud architecture principles
- Basic knowledge of frontend development principles (preferably Angular)
- Hands-on experience with Docker, Kubernetes and Cloud Platforms
- Experience with CI/CD pipelines and agile development methodologies (e.g. Scrum, Kanban)
- Familiarity with Extreme Programming (XP) practices such as Pair Programming, Test-Driven Development (TDD), and Continuous Integration
- Confident English-speaking skills (min. B2)
Nice to have
- Experience with AI Assistant Tools
- Solid understanding of business process modeling and workflow orchestration using BPMN 2.0 (ideally combined with execution experience on engines like Camunda)
- Communicative knowledge of the German language
What we offer
- Long-term career growth opportunities within an international organization
- The chance to design and develop PSI’s proprietary products
- A team of highly experienced specialists eager to share knowledge
- Comfortable office environment (small rooms, chillout space, parking)
- Stability and security of employment in a company with a 50-year tradition
- Flexible working hours and a friendly atmosphere with no artificial hierarchy
- Well-defined career development paths
- Access to technology conferences, training, and language courses (English and German)
- Benefits package: private medical care, group insurance, benefits platform, Multisport card
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On-site
Stockholm, Sweden
🏢 Summary: Fullstack Developer role focused on building scalable web applications using ASP.NET, C#, and React, with strong emphasis on API design, event-driven architecture, and cloud-native environments. The position involves end-to-end development, CI/CD practices, containerized deployments, and collaboration in agile teams. Ideal for engineers experienced in backend services, modern frontend ecosystems, and orchestration tools. 🗂️ Requirements: Strong experience with ASP.NET, Strong experience with C#, Experience building scalable backend services and APIs, Strong experience with React, Understanding of modern frontend architecture, Experience with API design, Experience with GitLab CI/CD, Experience with RabbitMQ, Experience with Docker, Experience with Kubernetes 📃 Skills: ASP.NET, C#, React, TanStack, Tailwind, Playwright, RabbitMQ, Docker, Kubernetes, GitLab, Linux, Unity, APIs, CI/CD 🏢 Description: Role Overview We are looking for a skilled Fullstack Developer with strong backend expertise in ASP.NET and C#, combined with modern frontend development using React. The role involves building scalable web applications, designing robust APIs, and contributing to cloud-native and event-driven architectures. The ideal candidate is comfortable working across the full stack, collaborates well in agile teams, and has an interest in modern tooling, orchestration, and frontend ecosystems. Core Responsibilities • Design, develop, and maintain scalable fullstack applications • Build and maintain backend services using ASP.NET and C# • Develop responsive and modern frontend applications using React • Design and integrate APIs and asynchronous communication flows • Collaborate with developers, designers, QA, and DevOps teams • Contribute to architecture discussions and technical decisions • Ensure code quality through testing, reviews, and CI/CD practices • Participate in deployment, monitoring, and troubleshooting activities Must-Have Skills Backend • Strong experience with ASP.NET • Strong experience with C# • Experience building scalable backend services and APIs Frontend • Strong experience with React • Good understanding of modern frontend architecture and component-based development Should-Have Skills • Experience with GitLab Pipelines / CI-CD • Experience with API design and best practices Frontend Libraries & Tooling • Experience with: o TanStack o Tailwind CSS o Playwright o AI agent development (Kiro, Claude, Cursor) Messaging & Async Communication • Experience with: o RabbitMQ o Event-driven and asynchronous communication patterns • Understanding of async workflows across frontend and backend systems Infrastructure & Orchestration • Experience with: o Docker o Kubernetes • Familiarity with containerized deployments and orchestration Nice-to-Have Skills • Interest or experience in Unity / game development • Strong Linux competence Preferred Qualifications • Experience working in agile development environments • Strong problem-solving and debugging skills • Understanding of scalable and maintainable software architecture • Good communication and collaboration skills • Passion for learning modern technologies and frameworks Tech Stack Summary Area Backend: ASP.NET, C# Frontend: React Frontend Libraries: TanStack, Tailwind, Playwright Messaging: RabbitMQ Infrastructure: Docker, Kubernetes CI/CD: GitLab Pipelines Additional: Linux, API Design, Unity