Senior Backend Developer - C# and .NET 10 (Remote, Contractual) [AS239]

About Smart Working At Smart Working, we believe your job should not only look right on paper but also feel right every day. This isn’t just another remote opportunity - it’s about finding where you truly belong, no matter where you are. From day one, you’re welcomed into a genuine community that values your growth and well-being. Our mission is simple: to break down geographic barriers and connect skilled professionals with outstanding global teams and products for full-time, long-term roles. We help you discover meaningful work with teams that invest in your success, where you’re empowered to grow personally and professionally. Join one of the highest-rated workplaces on Glassdoor and experience what it means to thrive in a truly remote-first world. About the Role We are looking for a Senior Backend Developer to join a collaborative product engineering team building and scaling a modern accommodation booking platform used by corporate travellers worldwide. This role is focused on developing and evolving scalable backend services and APIs using C# and .NET 10, helping power critical booking, quoting, integration, and search functionality across the platform. You will work closely with Product Managers, QA Engineers, Data teams, and other Engineers to deliver reliable, maintainable, and high-performing backend systems. The role involves a strong focus on API integrations, observability, CI/CD, and backend reliability in a fast-paced product environment. The team is currently focused on scaling and enhancing an internal accommodation booking engine, including:

• Accommodation search optimisation and advanced filtering
• AI-enhanced quoting and booking experiences