Senior Backend Engineer
Colliers is creating a new Technology Hub in Madrid to unify global platforms and build the backend systems that power products used across continents. This is your chance to design scalable services, set standards, and shape the way Colliers builds software worldwide — all from day one.
Curious to see what you could build and how you could make an impact? Keep reading! 👇
¿Qué harás?
Colliers is a global real estate services and investment management company with operations across EMEA, the Americas, and APAC. They help clients buy, lease, operate, and optimise property portfolios, and are now scaling a global technology platform to drive data-driven decisions and modern digital products. Technology has strong executive sponsorship and a global leadership structure (Software Engineering, Data & AI, Infrastructure, Product, Enterprise Architecture, etc.) to unify and standardise how software is built worldwide.
Colliers is launching a Technology Hub in Madrid to bring together a diverse landscape of internal and client-facing applications into a single, standardised development environment. Think containerized dev setups, robust CI/CD, shared component libraries/design systems, security screening baked into the pipeline, and, above all, a strong Developer Experience. The work spans platform engineering and product delivery (analytics & data products, internal platforms, client portals), in close collaboration with Product, Data & AI, and Infrastructure teams.As a Backend Engineer, you’ll work mainly with .NET/C# (ASP.NET Core), microservices and event-driven patterns, building APIs that power global products across regions.
Help build and consolidate a high-performing engineering hub from the ground up by turning Colliers’ global strategy into execution at the code level:
- Design, build and maintain scalable services and APIs on a unified, cloud-native platform (.NET, containers, CI/CD).
- Rationalise and modernise legacy apps (keep, refactor or rebuild) while eliminating duplicated country-specific solutions.
- Uphold common tooling and standards (coding, testing, releases, observability, security & privacy) and contribute to engineering KPIs (throughput, lead time, reliability).
- Collaborate closely across time zones and functions (Product, DevOps, Data, QA, Architecture), translating business requirements into robust technical solutions.
This is a multi-year transformation with real autonomy, high visibility, and the opportunity to shape how Colliers builds software at global scale from inside the codebase.
Tu evolución
En 1 mes
You will have completed your onboarding with your manager and key peers in Software Engineering, Product, Data & AI, Infrastructure, Security and Enterprise Architecture, gaining a high-level view of the business and how the current application landscape is distributed across countries. You will be familiar with the main platforms and internal tools, understand the Madrid hub’s initial scope, have your .NET/C# environment and CI/CD pipelines set up, and know exactly who to turn to for each domain.
Tus responsabilidades
Design & build services. Develop scalable .NET/C# (ASP.NET Core) microservices and clean APIs (REST/GraphQL) with solid testing and performance.
Own delivery end-to-end. Code, review, automate with CI/CD, containerize (Docker/Kubernetes), and operate services in production.
Make it observable & reliable. Instrument logs, metrics and traces, define alerts, run RCAs and improve metrics such as lead time, deploy, etc.
Modernise the stack. Refactor and rebuild legacy components, remove duplicated country apps, and contribute shared backend libraries and patterns.
Build securely by default. Apply secure coding, data privacy and compliance controls (ISO/GDPR/SOC2) embedded in the pipeline.
Collaborate & elevate. Partner with Product, DevOps, Data, QA and Architecture; mentor peers, uphold standards, and document data-informed decisions.
¿Cómo lo harás?
As part of a cross-functional squad in the Madrid Technology Hub, design, build and operate backend services that help set the reference for how Colliers ships software globally. Squads own services end-to-end, make decisions close to the problem, and work within clear global guardrails for security, privacy and architecture.
Mentoring peers through design reviews and code reviews, you’ll share best practices and foster a culture of high standards with psychological safety, where failures are documented, teams learn quickly, and improvements happen without blame.
Ownership of your domain includes planning and estimation, turning product requirements into well-scoped work, and delivering predictably across regions and time zones in close collaboration with Product.
Together with EngOps and Architecture, evolve a unified developer platform: containerised dev environments, automated testing, trunk-based development and CI/CD by default. Reusable backend building blocks accelerate delivery, while security, privacy and compliance (ISO/GDPR/SOC2) are embedded in the pipeline, not bolted on.
¿Cuándo trabajarás?
Colliers promotes a flexible, outcome-driven culture where work is async-first and meetings are kept intentional and time-boxed. With their global setup, teams operate mainly within EMEA hours, occasionally joining early or late sessions with the Americas or APAC — always balanced with time off.
Within these guardrails, engineering squads have the autonomy to set their own team rhythm (ceremonies and any optional core hours), ensuring tight coordination without sacrificing flexibility.
Vacaciones
23 días¿Dónde trabajarás?
Presencial
Teletrabajo
Colliers operates on a hybrid model: teams work two days per week on-site at their central Madrid office (Paseo de la Castellana), with the rest managed remotely by each squad. Flexibility to be in the office when the role or project requires it is expected — but always within reason.
For them, on-site presence is about culture, collaboration, and speed, not control. They embrace a trust-based, async-first way of working, giving engineers autonomy while keeping the team connected.
¿Con quién trabajarás?
Although Colliers has more than 22,000 employees worldwide, its technology organization is much smaller and distributed across multiple countries and regions. The Madrid Technology Hub is brand new, and you’ll be the one of the first people on the ground. Your initial points of contact will be Christian, Tobias and the new Software Engineering Director for Spain. If you’d like to check their profiles, here they are:
- Christian Reitz (Global Head of Software Engineering)
- Tobias Klöpper (Global Senior Director EngOps and DevOps)
¿Qué piden?
Colliers is building a global Technology Hub in Madrid to redefine how software is designed, built, and shipped worldwide. They are looking for Senior Backend Engineers to develop scalable, high-impact systems, set global standards, and play a key role in a multi-year transformation.
- 5+ years designing and building backend systems with .NET/C# (ASP.NET Core) and microservices.
- Strong API design skills (REST/GraphQL).
- Databases: SQL/NoSQL (SQL Server, Postgres, MongoDB, Cosmos) and caching (Redis).
- Cloud-native & CI/CD: containers (Docker/Kubernetes), pipelines, trunk-based development; GCP preferred (Azure/AWS valued).
- Observability & reliability: logs/metrics/tracing, alerting/SLOs; performance tuning and incident tools.
- Security & compliance by default: secure coding, data privacy, and controls aligned with ISO/GDPR/SOC2.
Beyond Tech:
- Experience in Agile delivery (Scrum/Kanban) and distributed, multicultural teams.
- Excellent communication skills in English and Spanish.
- A builder mindset: ownership, pragmatism, and sleeves rolled up when needed.
Tecnologías
Innegociable
.NET
Avanzado 
SQL
Avanzado 
Docker
Avanzado
Estaría bien
Google Kubernetes Engine
Avanzado 
Google Cloud
Intermedio
Otras habilidades
Innegociable
Pensamiento analítico
Aprendizaje Continuo
Atención al detalle
Estaría bien
Capacidad de autogestión
Comunicación intercultural
Suma puntos
Trabajo en equipo
Idiomas
¿Qué ofrecen?
Salario
€50-70KRemoto
60%At Colliers, they want you to do your best work and enjoy the journey. Here’s what’s on the table:
- 🎯 Competitive salary – up to €70K
- 🩺 Private health insurance to keep you covered
- 🚌 Transport card and 🍽️ restaurant card for everyday ease
- 💂 English classes to grow your skills
- 🎂 23 vacation days + your birthday afternoon off
- 🍼 Childcare voucher to support your family
- 🏃 Sporting events to stay active and connected
Beneficios
Cheque Guardería
Clases de Idiomas
Seguro de salud
Ayuda con el transporte
Dinámicas y eventos de teambuilding
What the FAQ?
Yes, but the role is hybrid in Madrid, so you will need to live in or relocate to the Madrid area. You will be employed by Colliers Spain, which means you must have the legal right to work in Spain (e.g., EU/EEA/Swiss citizenship or a valid Spanish work permit/visa).
Work-authorization specifics will be confirmed during the process.
Stage 1 – Intro (≈30 min): Screening call with Tobias Klöpper (or a senior engineering lead). Background, motivation, and fit with the Madrid Hub context.
Stage 2 – Technical deep-dive: System design and backend problem-solving on a Miro board (APIs, data models, reliability, security). Short prep window, then a collaborative discussion with engineers.
Stage 3 – final call/meeting