Senior Fullstack Engineer (.NET/React + Umbraco)

About the role

We are seeking a Senior Full‑Stack Engineer to work on multiple client‑facing web projects for a digital agency. You will build and maintain scalable applications using .NET technologies on the backend and modern JavaScript frameworks on the frontend, integrating CMS‑driven solutions.

Key responsibilities

• Design, develop, and maintain full‑stack features across several client projects.
• Build backend services with C# and .NET Core.
• Create responsive frontend applications using JavaScript and React or Angular.
• Integrate Umbraco CMS, APIs, and third‑party services to enable content‑driven experiences.
• Participate in architecture discussions and make technical decisions.
• Conduct code reviews and enforce engineering quality standards.
• Collaborate with designers, strategists, producers, and fellow engineers throughout the development lifecycle.
• Ensure code quality through testing, performance optimization, and best‑practice adherence.
• Document solutions and support continuous improvement initiatives.

Required profile

• 5+ years of professional software development experience.
• Strong background in C#.NET Core, JavaScript, and modern frontend frameworks (React or Angular).
• Experience integrating CMS platforms, APIs, and third‑party services.
• Proven ability to work independently while communicating progress, risks, and recommendations.
• Comfortable participating in code reviews and technical architecture discussions.

Required skills

• C#
• .NET Core
• JavaScript
• React
• Angular
• Umbraco CMS
• API integration
• Third‑party service integration
• Automated testing
• Performance optimization
• Code review practices
• Technical documentation