Senior Software Engineer

Do you have what it takes to boost our software engineering capabilities within NN Group? Then this is the role for you. You will combine strong development skills with a sharp ear for team needs, helping shape modern engineering practices and accelerating delivery with AI.

You bring 10+ years of development experience, a solid foundation in C#, object‑oriented principles, and system integration, as well as a track record of building high‑quality APIs in a modern Azure‑based environment. In this role, you will design and build robust, scalable APIs and help raise the engineering maturity of the team by introducing best practices, mentoring colleagues, and leveraging AI to improve speed, quality, and decision-making.

What you are going to do

Together with your colleagues, you will be building a flexible, secure, and highly automated API landscape on Azure. You will work on the in‑house development, modernization, and enhancement of API services, alongside the daily operations that keep them reliable and observable. You will build, test, deploy, and run APIs as part of user stories, in accordance with business requirements, considering security, performance, and architectural guidelines, supported by CI/CD and cloud automation.

As a senior software engineer you will help define the API engineering competence within the team: shaping ways of working, promoting effective patterns and practices, and coaching teammates. You will also apply AI in pragmatic ways to improve code quality, testing, documentation, and architectural decision making. The mantra of an NN engineer is: “you plan it, build it, test it, ship it, run it.”

• Design and build robust, secure, and scalable .NET APIs on Azure App Services and Azure Functions, creating new services and modernising existing ones
• Apply and champion strong API practices (REST best practices, idempotency, throttling, concurrency mitigation, performance, and complex filtering)
• Use AI tools (GitHub Copilot, Azure OpenAI, internal NN tooling) to improve code quality, testing, documentation, and support architectural decisions
• Integrate with platforms such as ServiceNow, IdentityNow, Entra, Active Directory
• Collaborate closely with DevOps teammates, product owners, architects, and security experts
• Raise engineering maturity through mentoring, CI/CD and observability improvements, and a “build–test–ship–run” DevOps mindset

What we offer you

• 13e maand en vakantiegeld
• 27 vakantiedagen en 1 Diversiteitsdag
• Hybride werken
• 13th month and holiday allowance are paid with your monthly salary
• 27 vacation days for a 5-day working week and one Diversity Day
• A modern pension administered by BeFrank
• Plenty of training and learning opportunities
• NS Business Card 2nd class, which gives you unlimited travel, also privately. Do you prefer to travel with your own transport? Then you can declare the kilometres travelled
• Allowances for setting up your home office and for internet use

Who you are

• 10+ years as an API/backend engineer with deep .NET expertise and hands‑on experience designing APIs from scratch
• Expert level knowledge in C#, OO design principles, modern API development, REST standards, idempotency, throttling, concurrency, and performance optimization
• Experienced with Azure App Services/Functions, cloud‑native architectures, and both SQL & NoSQL data stores; with a strong background in system integration
• Empathic communicator and mentor who raises team engineering standards and leverages AI tools to improve speed and quality
• Experience with Blazor (or similar component frameworks) and modern frontend/backend integration, along with hands‑on expertise in Infrastructure as Code (Terraform, ARM) and DevOps CI/CD principles

Who you will work with

You will become a member of an IAM product team, collaborating closely with DevOps engineers, product owners, architects, and security experts. The team delivers API products and supports tooling that power business capabilities across NN. Together, you will ensure our services are secure, reliable, and scalable. Our culture is open and supportive: we value knowledge sharing, lightweight processes, blameless learning, and continuous improvement. Expect a collaborative setup with clear ownership, short feedback loops, and a practical, service‑oriented mindset.