Company Description Colliers is a leading diversified professional services and investment management company.

Company Description We are seeking an experienced and passionate Principal Software Engineer for our newly established Technology Hub in Madrid. Working in a hybrid model (remote & onsite), you will enjoy significant freedom to innovate and influence the future of one of the world's largest commercial real estate companies. With the leadership of the Global Technology Hub coming from a background of technology startups, you will benefit from a fast-paced learning environment, high visibility of your contributions and opportunities to shape processes, culture, and technology strategies.

At the same time, you take advantage of the stability, resources, and reach of a successful global company. Guided by our global digital strategy, the Madrid Hub collaborates closely with international teams to deliver world‐class technology solutions that power the future of commercial real estate.

As Principal Software

Engineer , you will be instrumental in translating business and functional requirements into robust, scalable, and evolvable system architectures. Your expertise will contribute directly to the quality of modern, component‐based front‐end application built with React and Typescript, as well as robust backend services developed in .NET. You are a hands‐on problem‐solver with strong quality principles, who thrives in a collaborative and agile environment.

Design and evolve end-to-end system architectures based on functional and non-functional requirements, balancing business goals,



scalability, security, performance, and cost. Produce clear architectural artefacts (diagrams, decision records, reference implementations) that guide engineering teams through implementation. Translate high-level business needs into clear architectural designs and proofs of concept, including system boundaries, integration patterns, data flows, and technology choices.

Work closely with Engineering Managers and act as a trusted advisor for software engineering teams. Ensure consistency and quality through architecture reviews, design walkthroughs, and technical governance forums. Work closely with Software Engineering, Product Management, DevOps, EngOps teams to ensure architectural alignment throughout delivery.

Partner with DevOps and Cloud Engineering teams to ensure application architectures align with platform capabilities, CI/CD pipelines, and operational models. Collaborate with Engineering Operations to ensure architectural decisions support delivery metrics, reliability goals, and operational excellence. Support engineering teams during implementation, helping resolve complex design or integration challenges. 12+ years of experience in software engineering,



and at least 5+ years in software architecture or system design roles. ~ Strong understanding of SOA, microservices, event-driven architectures, and API development (REST/GraphQL). ~ Strong background in modern backend architectures (e. g. .NET, microservices, event-driven systems, APIs), and modern frontend architectures (e. g.

React, TypeScript) and how they integrate with backend services. ~ Deep knowledge of cloud-native architectures and containerization. ~ Experience with SQL and NOSQL databases (e. g. SQL Server or Postgres SQL, Cosmos DB, MongoDB), as well as caching with Redis or similar. ~ Strong grasp of non-functional requirements: performance, scalability, availability, security, and observability. ~ Excellent communication skills, with the ability to explain complex technical concepts to non-technical stakeholders and influence technical direction without direct management authority, fluent in English and Spanish. ~ Agile Development experience (Scrum/Kanban), including story estimation, code reviews, and pair programming. ~ Experience working in distributed or remote teams and using tools such as Jira, GitHub, Miro, and Azure DevOps. ~ Solid understanding of performance optimization. ~ Enthusiastic about building high-quality software products with empowered teams. ~ Experience with performance testing and security testing tools Experience in working in a integral, multi-cultural organization.

Experience working closely with DevOps, CloudOps, SRE and familiarity with CI/CD pipelines, IaaC

📌 Principal Backend Engineer (Hybrid) (Madrid)
🏢 Colliers
📍 Madrid