Senior Backend Engineer - .NET, Madrid Tech Hub (Hybrid)

Colliers; Madrid; Híbrido; EUR 90.000 - 120.000; Jornada completa

Descripción de la vacante

Colliers Madrid is seeking an experienced Senior Backend Engineer to join our newly established Technology Hub in Madrid. You will design, develop and maintain scalable enterprise software, collaborating with global teams in a hybrid model that combines remote and onsite work.

You will specialize in the .NET stack, contribute to architectural decisions, and mentor junior engineers while delivering high-value tech solutions for a leading international real estate company.

Formación

• 8+ years of .NET software development with C# and ASP.NET Core.
• Strong knowledge of object-oriented design, microservices and API development (REST/GraphQL).
• Experience with SQL and NoSQL databases (SQL Server, Postgres, Cosmos DB, MongoDB).
• Cloud-native architectures, CI/CD pipelines and DevOps practices (preferably GCP).
• Experience in containerization (Docker, Kubernetes).
• Agile Development experience (Scrum/Kanban) including story estimation and code reviews.
• Excellent interpersonal and communication skills; fluent in English and Spanish.
• Understanding of security and compliance frameworks (GDPR, ISO27001).

Responsabilidades

• Implement scalable and maintainable B2B software products using the Microsoft .NET stack (C#, ASP.NET Core).
• Contribute to architecture discussions/technology evaluation and participate in system and code reviews.
• Help define and adhere to coding standards, documentation and modern software lifecycle best practices (SOLID, unit testing, CI/CD, secure coding).
• Collaborate with product managers, designers, and QA to translate business requirements into technical specifications and user stories.
• Participate in sprint planning, backlog refinement and feature grooming to ensure technical feasibility and shared understanding.
• Act as a technical mentor to mid-level and junior engineers.
• Identify opportunities for technical improvements and advocate for high-quality engineering standards.
• Participate in design and code review sessions to uphold engineering excellence.
• Take on technical ownership of production systems.
• Continuous improvement of agile methodologies and tools.
• Drive culture of test-first development with unit, integration and performance testing.
• Support root cause analysis and resolution of production issues, ensuring high reliability and uptime.
• Contribute to ongoing platform refactoring and modernization efforts.
• Work closely with DevOps and Engineering Operations teams to optimize build pipelines, observability and deployment automation.
• Ensure compliance with global standards, information security policies and regulatory requirements.
• Collaborate regularly with Product Teams, especially Product Owners, to align on requirements, clarify priorities and deliver business value iteratively.

Conocimientos

C# / ASP.NET Core

API design (REST/GraphQL)

OO design & microservices

Cloud-native architecture

CI/CD / DevOps

Agile / Scrum / Kanban

Distributed/remote teamwork

English & Spanish fluency

Performance optimization

Security & GDPR knowledge

Herramientas

Docker

Kubernetes

Jira

GitHub

Azure DevOps

Miro

Descripción del empleo

Colliers Madrid is seeking an experienced Senior Backend Engineer to join our newly established Technology Hub in Madrid. You will design, develop and maintain scalable enterprise software, collaborating with global teams in a hybrid model that combines remote and onsite work.

You will specialize in the .NET stack, contribute to architectural decisions, and mentor junior engineers while delivering high-value tech solutions for a leading international real estate company.