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Senior .NET developer

We are looking for a senior developer who will take ownership of designing and building high-quality, well-tested software solutions within the Transport Execution Management domain. You will work closely with the solution designer and business stakeholders to translate ideas into effective, reliable applications, gaining a deep understanding of the business context along the way.

Beyond strong technical expertise, we are looking for someone who shows initiative, communicates clearly, contributes actively to the team, and is willing to go the extra mile when needed. You are respectful and calm in your interactions. Independence is key in this role: taking full responsibility for delivering complete solutions is part of your daily work. At the same time, you value teamwork and knowledge sharing. In line with the PROS values of SNCB, you bring professionalism and a constructive attitude that helps the team move forward.

Conformity criteria

• For this assignment, the organization requires the contractor to agree to be present at the office up to five days per week for the execution of the assignment. The required on-site presence may vary and will be communicated during the course of the assignment.
• .NET development: more than 5 years of experience
• Azure Cloud development: more than 3 years of experience.
• .NET Core Web API development: Over 3 years of experience
• Demonstrable experience in unit testing code on at least 3 projects
• Demonstrable experience with Clean Code, Clean Architecture and SOLID principles on at least 3 projects
• You communicate fluently in English (spoken and written) with at least level C1.

Evaluation criteria

The extent to which the proposal demonstrates the required competencies and complies with the stated requirements will be taken into account during the evaluation. Proposals that demonstrate these competencies and requirements more clearly, comprehensively, and convincingly will receive a higher score. Where specific experience is requested, a greater amount of demonstrable relevant experience will result in a higher evaluation score.

• .NET development – demonstrates strong mastery of the .NET ecosystem, including language features, LINQ, async/await, security practices, data structures and design patterns.
• Code quality & craftsmanship – writes clean, maintainable and SOLID code that follows proven engineering practices.
• Web API design & development – designs secure, performant .NET Core Web APIs.
• Azure cloud – leverages Azure services, PaaS components, and event-driven patterns effectively.
• Unit testing & test quality – creates meaningful, maintainable and automated unit tests.
• CI/CD & DevOps practices – sets up robust Azure DevOps pipelines and manages containerized deployments with Kubernetes & Docker.
• API integration & offline/online synchronization – integrates reliably with backend APIs and designs Android applications that can handle offline usage, local persistence, synchronization, conflict handling and recovery when connectivity is restored.
• SQL & database design – models, queries, and optimizes relational databases.
• Git & version control – applies branching strategies and collaborates efficiently using Git.
• Communication – explains technical choices clearly.