Senior .NET Developer

In4Matic; Brussel; Remote; EUR 70,000 - 90,000; Full time

Job summary

In4Matic in Brussels seeks a Senior .NET Developer to own the design and delivery of high-quality software within a complex Transport Execution Management environment. You will collaborate with solution designers and business stakeholders to translate needs into reliable, maintainable applications, exercising technical leadership and autonomy.

The role demands hands-on .NET, .NET Core Web API, Azure, Docker and Kubernetes expertise, with strong emphasis on clean code, SOLID principles, secure

Qualifications

• More than 5 years of professional .NET development experience.
• More than 3 years of Azure Cloud development experience.
• More than 3 years of .NET Core Web API development experience.
• Demonstrable unit testing across at least 3 projects.
• Demonstrable use of Clean Code, Clean Architecture and SOLID across projects.
• Strong knowledge of .NET ecosystem, including LINQ, async/await, security, data structures and patterns.
• Experience designing secure and performant Web APIs.
• Experience with Azure services, PaaS components and event-driven patterns.
• Experience with CI/CD, Azure DevOps, Docker and Kubernetes.
• Strong SQL and relational database skills.
• Good Git knowledge and modern version control practices.
• Proactive, independent and solution-oriented mindset.
• Strong communication and teamwork skills.

Responsibilities

• Deliver complete solutions from design through implementation and testing.
• Design and develop robust applications using .NET and .NET Core Web API.
• Translate business requirements into effective software solutions.
• Apply Clean Code, Clean Architecture, and SOLID principles.
• Develop secure, scalable, and performant APIs.
• Build automated unit tests and maintain code quality.
• Work with Azure cloud services, PaaS components, and event-driven patterns.
• Contribute to CI/CD pipelines and DevOps practices using Azure DevOps.
• Use Docker and Kubernetes for containerised deployments.
• Integrate applications with backend APIs and support data synchronization.

Skills

.NET development

Azure Cloud

Web API development

Unit testing

CI/CD

Docker & Kubernetes

SQL databases

Git

Clean Code / SOLID

Tools

Azure DevOps

Docker

Kubernetes

Job description

Function

We're looking for a Senior .NET Developer to join our client's team and take ownership of designing and delivering high-quality software solutions within a complex Transport Execution Management environment. You'll work closely with solution designers and business stakeholders to translate functional needs into reliable, maintainable applications while developing a strong understanding of the business context. This role is suited to an experienced developer who combines strong technical expertise with initiative, clear communication, autonomy, and a collaborative mindset.

Role & Responsibilities

You'll be responsible for delivering complete solutions from design through implementation and testing, while contributing actively to technical discussions and continuous improvement. Your responsibilities will include:

• Design and develop robust applications using the .NET ecosystem and .NET Core Web API.

• Translate business requirements and technical concepts into effective software solutions.

• Apply Clean Code, Clean Architecture, SOLID principles, and established design patterns.

• Develop secure, scalable, and performant APIs.

• Build and maintain meaningful automated unit tests and ensure a high standard of code quality.

• Work with Azure cloud services, PaaS components, and event-driven architectures.

• Contribute to CI/CD pipelines and DevOps practices using Azure DevOps.

• Work with Docker and Kubernetes for containerised deployments.

• Integrate applications reliably with backend APIs and support online/offline data synchronisation where required.

• Work with relational databases, including database modelling, SQL querying, and performance optimisation.

• Use Git effectively and contribute to sound branching and collaboration practices.

• Communicate technical decisions clearly to both technical and non-technical stakeholders.

• Take ownership of deliverables, proactively identify issues, and contribute to the team's overall success.

Technical Profile

The ideal candidate has strong hands-on experience with modern .NET development and cloud-based application architectures. You should bring:

• More than 5 years of professional experience in .NET development.

• More than 3 years of experience with Azure Cloud development.

• More than 3 years of experience developing .NET Core Web APIs.

• Demonstrable unit testing experience across at least 3 projects.

• Demonstrable experience applying Clean Code, Clean Architecture, and SOLID principles across at least 3 projects.

• Strong knowledge of the .NET ecosystem, including LINQ, async/await, security practices, data structures, and design patterns.

• Experience designing secure and performant Web APIs.

• Experience with Azure services, PaaS components, and event-driven patterns.

• Experience with automated testing, CI/CD, Azure DevOps, Docker, and Kubernetes.

• Strong SQL and relational database skills.

• Good knowledge of Git and modern version control practices.

• A proactive, independent, and solution-oriented approach.

• Strong communication and teamwork skills.

• The ability to remain calm, constructive, and professional in challenging situations.

Languages & Practical Information

You communicate fluently in either Dutch or French at C2 level and in English at C1 level, both spoken and written. This is a consulting assignment in which independence and ownership are essential. The role may require on-site presence up to five days per week, depending on the client's operational needs.

Contactperson & Reference

• Reference #: INW28313
• Pieter Messely
• [e-mail]