Backend Engineer (.NET) - Hybrid

About the role

Colliers, a global real estate advisory and investment management company, is looking for an experienced Backend Engineer for its newly established Technology Hub in Madrid. Reporting to the Manager, Software Engineering, the role is based in the Madrid office and works in a hybrid model (remote and onsite). The engineer specializes in .NET and contributes to global products and platforms serving commercial real estate across multiple regions, collaborating with international Product, Engineering, DevOps, Data, QA and Architecture teams.

Key responsibilities

• Develop scalable, maintainable B2B software using the Microsoft .NET stack (C#, ASP.NET Core)
• Take part in architecture discussions, technology evaluation and code reviews, and help define coding standards and software lifecycle best practices such as SOLID, unit testing, CI/CD and secure coding
• Translate business requirements into technical specifications and user stories with product managers, designers and QA, and take part in sprint planning and backlog refinement
• Advocate for high-quality engineering standards, own production systems and support root cause analysis of production issues
• Drive test-first development with unit, integration and performance testing, and contribute to platform refactoring and modernization
• Work with DevOps and Engineering Operations to optimize build pipelines, observability and deployment automation, and ensure compliance with global standards, information security and regulatory requirements

Required profile

• 5+ years of experience in .NET software development with C# and ASP.NET Core
• Strong knowledge of object-oriented design, microservices architecture and API development (REST/GraphQL)
• Experience in distributed or remote teams and with tools such as Jira, GitHub, Miro and Azure DevOps
• Fluent in English and Spanish

Required skills

• SQL and NoSQL databases (e.g. SQL Server, PostgreSQL, Cosmos DB, MongoDB) and caching with Redis or similar
• Cloud-native architectures, CI/CD pipelines and DevOps practices (preferably GCP)
• Containerization with Docker and Kubernetes
• Agile development (Scrum/Kanban), including story estimation, code reviews and pair programming
• Preferred: DDD, event-driven architecture, observability tools (e.g. Sentry, Lighthouse), and experience in a global, multi-cultural organization