Senior Backend Engineer (.NET, Cloud & APIs)
Hybrid · Vigo, Galicia, Spain
Job Summary
Senior Backend Engineer with strong expertise in C#/.NET, cloud-native backend development, and API engineering. Design, develop, and maintain secure, scalable backend services in cloud environments. Build secure REST APIs, apply architectural patterns and SOLID principles, implement tests (unit, integration, end-to-end, performance), and contribute to CI/CD pipelines. Collaborate with cross-functional teams, follow architecture guidelines, and embrace AI-assisted development tools (e.g., Cursor, Claude Code, Codex, Github Copilot). Focus areas include high-concurrency production workloads, observability, reliability, and DevOps practices. Location in Vigo, Spain with hybrid work option; English proficiency required.
Required Qualifications
- 6+ years backend development experience
- Proficiency in C# and .NET Core
- Experience designing and implementing REST APIs
- Experience with cloud platforms (AWS, Azure, or GCP)
- Docker experience
- CI/CD workflows
- SQL and relational databases
- Familiarity with SOLID, Clean Architecture, DDD
- Experience with unit, integration, and performance tests
- Agile and DevOps practices
- AI-assisted development tooling (Cursor/Claude-Code/Codex/Github Copilot)
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