.NET/C# Backend Developer

Details

Backend Development - B2B Platform

• Design, develop, and maintain .NET/C# backend services, APIs, and integrations that power Eneco's B2B digital platform
• Build and maintain the integration layer between frontend and backend systems, ensuring reliability, performance, and maintainability
• Contribute to the full software development lifecycle - from solution design and implementation through to testing, deployment, and operational support
• Collaborate closely with frontend engineers, product managers, testers, and designers to deliver business features end to end
• Identify and resolve performance, reliability, and maintainability issues proactively

Backend Architecture - Community of Practice

• Participate actively in Eneco's Backend Community of Practice - a cross-organisational group of backend engineers working together to optimise the backend ecosystem
• Contribute to architectural discussions about backend standards, patterns, and tooling across the organisation
• Support knowledge sharing, code reviews, and technical best practices to raise engineering quality across teams
• Help evaluate and validate technical solutions through Proof of Concepts in collaboration with architects and senior stakeholders

Engineering Quality and Ownership

• Write clean, testable, and maintainable code that meets both business and technical requirements
• Take ownership of assigned work - communicate progress, flag blockers early, and deliver reliably
• Contribute to documentation and continuous improvement initiatives within the team
• Expand your skills beyond your core stack when the team needs it - you bring a T-shaped mindset

Experience

• Hands-on backend development experience with .NET/C#
• Experience building and maintaining APIs, backend services, and integrations in a production environment
• Familiarity with cloud platforms, particularly Azure
• Experience with relational databases, specifically SQL Server - designing and optimising data access solutions
• Experience with containerised applications (Docker) and modern architectures such as microservices and event-driven systems
• Comfortable working in CI/CD pipelines and contributing to DevOps practices

Knowledge and Expertise

• Solid understanding of software design principles, clean code practices, and what makes code maintainable and testable
• Familiarity with integration patterns between frontend and backend systems
• Understanding of scalable and performant backend architecture
• Experience in or appetite for cross-team technical collaboration and architectural discussions
• Exposure to the energy sector, B2B digital platforms, or large-scale enterprise environments is a plus - not a requirement

Skills and Competencies

• Collaborative by nature - you work well with frontend engineers, product managers, testers, and designers
• Clear communicator who can contribute to architectural discussions and articulate technical trade-offs
• Ownership mindset - you take responsibility for your work from design through to production
• T-shaped: strong backend depth with the flexibility to support the team across disciplines when needed
• Curious and learning-oriented - you look for ways to improve systems and share what you learn

Work arrangement / location

• You will work hybrid - focus days at home combined with collaboration days at Eneco's Rotterdam HQ.
• Around 80-90% of your time is spent delivering features end to end in the B2B product team.
• The other 10-20% of your time goes into Eneco's Backend Community of Practice.
• Work 40% at the office, 40% from home, and 20% flexibly. With manager approval, you may work abroad (within approved countries) up to 3 weeks/year, max 2 consecutively.

Salary

• Gross annual salary between €70,000 and €95,000
• Including FlexBudget, 8% holiday allowance, and depending on your role a bonus or collective profit sharing.
• FlexBudget: Have it paid out, use it to buy extra holiday days or save it up for something nice, it's up to you.

Company / role context

• This role contributes to Eneco's B2B platform, enabling integrations and APIs built for Eneco's business customers.
• Your architectural input reaches further than your own codebase via the Backend Community of Practice.

Application procedure

• Please apply directly via the Eneco Careers Portal. Applications submitted by email will not be processed.