Senior Backend Engineer

At Eneco, you contribute directly to the energy transition while working on technology that millions of customers use every day. In Customer Growth (B2C), you help people choose and stay with sustainable energy solutions through digital journeys at scale.

You'll join a people-oriented culture where ownership, collaboration and continuous improvement matter. We invest in strong teams, modern platforms and cloud-native technology, giving you the space to grow while delivering meaningful impact for customers and for a more sustainable future.

• Build and evolve backend services that power customer-facing journeys such as sales, onboarding and retention.

• Deliver incremental improvements and new features in a product environment with short iterations and fast feedback.

• Translate business and product needs into scalable, maintainable backend solutions using .NET and Azure.

• Collaborate closely with frontend engineers, product managers and business stakeholders to deliver end-to-end features.

• Work with a modern stack including .NET / C#, Minimal APIs, PostgreSQL (Marten), Redis, Docker, TestContainers and Wiremock.

• Contribute across the stack when needed, with room to work on frontend solutions (for example React) to deliver full customer value.

• Owning features end-to-end: from discussing requirements with business to delivering production-ready solutions.

• Designing and implementing robust APIs and backend services with a strong focus on quality, security and reliability.

• Proactively driving clarity by asking the right questions and collaborating across teams.

• Maintaining high code quality through testing, reviews and CI/CD best practices.

• Acting as a senior engineer by making technical decisions, supporting others and continuously improving how the team works.

• You have 7+ years of experience as a backend engineer and strong expertise in modern .NET (preferably .NET 8+ / .NET Core).

• You have hands-on experience with Azure, CI/CD pipelines (for example Azure DevOps) and modern development practices.

• You understand REST API design, system design and architecture patterns, and know how to meet non-functional requirements such as performance, reliability and security.

• You are comfortable working independently, taking ownership and proactively collaborating to unblock yourself and others.

• You communicate clearly and confidently, bridging technical and business perspectives in cross-functional teams.

• You are willing to work across the stack when needed and contribute to frontend development.

Nice to have: experience with PostgreSQL/Marten, functional programming concepts or distributed backend systems.

If you don't meet every requirement but feel this role fits your experience and motivation, we still encourage you to apply.

You'll join one of the product teams within Customer Growth (B2C) the part of Eneco focused on sales, retention and customer value. You work in a cross-functional team with backend, frontend, product and business colleagues, close to the customer problem and its impact.

The environment is dynamic and fast-paced, with frequent releases and clear ownership. While you start in a customer-facing team, there is flexibility to contribute across teams and topics, depending on priorities and your strengths.

• You own and shape end-to-end customer-facing journeys (sales, onboarding, retention) that directly impact Eneco's growth and customer base.
• You work in a fast-paced, product-driven environment with short feedback loops and visible business impact.
• As a senior backend engineer, you get real ownership and influence over technical decisions, ways of working and solution design.

• You have 7+ years of experience as a backend engineer and strong expertise in modern .NET (preferably .NET 8+ / .NET Core).

• You have hands-on experience with Azure, CI/CD pipelines (for example Azure DevOps) and modern development practices.

• You understand REST API design, system design and architecture patterns, and know how to meet non-functional requirements such as performance, reliability and security.

• You are comfortable working independently, taking ownership and proactively collaborating to unblock yourself and others.

• You communicate clearly and confidently, bridging technical and business perspectives in cross-functional teams.

• You are willing to work across the stack when needed and contribute to frontend development.

Nice to have: experience with PostgreSQL/Marten, functional programming concepts or distributed backend systems.

If you don't meet every requirement but feel this role fits your experience and motivation, we still encourage you to apply.

You'll join one of the product teams within Customer Growth (B2C) the part of Eneco focused on sales, retention and customer value. You work in a cross-functional team with backend, frontend, product and business colleagues, close to the customer problem and its impact. The environment is dynamic and fast-paced, with frequent releases and clear ownership. While you start in a customer-facing team, there is flexibility to contribute across teams and topics, depending on priorities and your strengths. * You own and shape end-to-end customer-facing journeys (sales, onboarding, retention) that directly impact Eneco's growth and customer base. * You work in a fast-paced, product-driven environment with short feedback loops and visible business impact. * As a senior backend engineer, you get real ownership and influence over technical decisions, ways of working and solution design.