We're looking for the special, unique and amazing YOU! At KCS IT, we look for the ones that stand out, the ones that always want to be better and fight for it, and for those who share our values: dedication, energy, integrity, transparency, flexibility, trust, honesty, hard work, proactivity, team work. Equality & Diversity Statement At KCS we stand for equality and value diversity. We create a safe, diverse environment where opportunities are equal for everyone! We do not discriminate based on age, ethnicity, sexual orientation, gender, disability or any factor other than merit. All applications with skills for the position are welcome! Position: Full Stack Developer .NET + React Seniority: Senior (5+ years) Type of position: Hybrid model in Lisbon. Candidates need to be already living in Portugal! Qualifications Minimum of 4 years of experience as a Developer, with at least 2 years in a Full Stack role. Hands‐on experience with .NET / .NET Core / ASP.NET Core and C# for backend development. Practical experience with React.js, including hooks, components, state management, and routing. Good knowledge of JavaScript / TypeScript, HTML, and CSS. Experience with both relational (e.g., SQL Server, PostgreSQL) and non‐relational (e.g., MongoDB, Redis) databases. Strong background in building and consuming REST APIs. Proficiency with Git version control. Experience performing manual testing and understanding of automated testing approaches. Fluent English (spoken and written) – essential for technical communication. Experience with CI/CD tools (e.g., Azure DevOps, GitHub Actions). Familiarity with Docker and/or Kubernetes. Awareness of web application security best practices. Experience with automated testing tools: Jest, React Testing Library (frontend), xUnit/NUnit (backend). Experience working with microservices architecture. Benefits & Perks You can develop a career that fits you: personalized development plans from short to long term. Interesting challenges ahead – work for several clients from different sectors. Free training programs: certification in languages, tech, behavior and business. International projects in Benelux – gain international experience. Project types: Hybrid systems – balance work with socialization. Full remote projects. Full onsite projects. Well‐being: free nutrition, psychology, general medicine appointments and yoga and personal training days – all remote. About Us Founded in 2008 and based in Lisbon, KCS IT is a consulting company in the field of Information Technology and Services, focused on creating value for our clients through Consulting, Outsourcing, Innovation and Training. Our commitment to talent development is reflected in the opening of hubs in Porto, Leiria, and Azores, aimed at developing technology for national and international markets. Since 2018 we have been among the 10 major companies in the "Index of Excellence". We value equality and diversity. We create a safe, diverse environment where opportunities are equal for all employees. We do not discriminate based on age, ethnicity, sexual orientation, gender, disability or any factor other than merit. All applications with skills for the role are welcome! #J-18808-Ljbffr