Fullstack ASP.NET Engineer (Poland - Remote)

We’re looking for a Senior Fullstack Engineer who brings deep technical expertise and a collaborative mindset to our product development team. You will work with a modern microservices architecture, building scalable backend services using the ASP.NET Web API with C#, and intuitive frontend interfaces using React and TypeScript. This is a hands-on engineering role with a 50/50 frontend-backend focus, ideal for someone who takes ownership, thrives in a dynamic product team, and enjoys mentoring others. If you're passionate about designing high-impact software in a cloud-native environment, we’d love to hear from you. Collaborate proactively in refinement sessions with product and tech teams to ensure clarity and feasibility of features. Design, implement, and maintain scalable web APIs using ASP.NET and microservices architecture principles. Develop responsive user interfaces with React and TypeScript that enhance usability and performance. Work closely with Product Owners to clarify feature requirements and ensure business context is well-understood. Define and align feature architecture with the Tech Lead to ensure consistency and scalability. Ensure features meet Definition of Done, with appropriate unit, integration, and end-to-end test coverage. Support incident response and production issue resolution as per team standards. Actively contribute to team knowledge sharing and coach colleagues in technical best practices. Essential Qualifications: 5 years of proven experience in building secure REST APIs using C#.NET, as well as developing solid front-end applications with React/JS and TypeScript. Comprehensive knowledge of contemporary web application architectures, with a focus on microservices and cloud design patterns. Demonstrated ability of high technical ownership and leadership (20% leadership expected). Bonus Skills: Hands-on experience with AWS infrastructure. Experience working in cross-functional product teams using Agile practices and following Domain-Driven Design (DDD). Collaboration and Interpersonal Skills: Clear and adaptive communication with both technical and non-technical stakeholders. Strong sense of ownership, accountability, and proactive problem-solving. Languages: English: fluent German: desired, not required Ukrainian: desired, not required A dynamic, ambitious team where your voice is heard, and your contributions truly matter. You’ll have real ownership over your decisions in a trusted, cross-functional environment within a Swiss product company that puts people first. We offer fair compensation, flexible working hours, a hybrid work setup, and a culture that supports both personal and professional growth, fostering a healthy work-life balance.