Software Engineer III

Software Engineer – .NET/Azure Tax Platform

Amsterdam | Hybrid Work Model | Full-Time

Taxes are complex. We make them manageable.

Nextens develops the leading tax and compliance platform for professionals in the Netherlands. Trusted by thousands of experts, our software helps organizations stay compliant, operate efficiently, and deliver accurate results. Each year, we process over a million filings, handling evolving tax rules, performance at scale, and complex data workflows with precision and reliability.

Built on deep domain expertise and a commitment to continuous innovation, Nextens not only ensures compliance, we set the standard for how tax professionals work.

As a Software Engineer at Nextens, you work on a business‑critical platform used daily by thousands of professionals. You develop new functionality, expand existing modules, and ensure that our software remains reliable, well‑tested, and future‑proof.

You enjoy technical challenges and have a strong eye for quality and sustainability. Together with domain experts, fellow engineers, and product owners, you build software that our customers can trust completely.

You will join Team Fiscal, a product engineering team responsible for key parts of our Dutch tax filing platform. Together with fiscal experts and product colleagues, the team translates changing legislation into reliable software for tax professionals across the Netherlands.

• Build and enhance core modules for tax filing and compliance, used by thousands of professionals every year.
• Use modern engineering practices, including AI‑assisted development tools where appropriate, to improve productivity, quality, and maintainability.
• Develop back‑end and front‑end components (APIs, interfaces, integrations) to ensure a scalable and stable platform, even with large data volumes and complex tax logic.
• Contribute to new features and innovations, such as integrations with external systems and tools for tax advisory workflows.
• Work closely with domain experts and product owners to translate regulations and customer needs into reliable software solutions.
• Safeguard quality and maintainability through testing, refactoring, and continuous improvement of both new and existing code.

• A bachelor's degree in Computer Science, Software Engineering, or equivalent experience.
• 2-5 years of hands‑on software development experience, ideally with .NET Core and Azure.
• Interest in using AI‑assisted development tools responsibly as part of everyday engineering work.
• Strong analytical and problem‑solving skills, especially when working with complex logic or data.
• A collaborative mindset — you enjoy working closely with engineers and domain experts to create practical, high‑quality solutions.
• A focus on clean, maintainable code and a habit of writing tests to ensure quality.
• Fluency in English is required. You can read and understand Dutch requirements texts; spoken Dutch is helpful but not essential.

At Nextens, your work powers the backbone of professional Dutch tax processing and helps thousands of professionals work smarter, faster, and more confidently. Our customers trust us not only for accuracy and compliance, but also because we innovate and improve how they work.

• Technical challenges - scalable systems, evolving regulations, and high‑volume data processing.
• Real impact - your solutions directly support over 1 million filings every year.
• Ownership - take responsibility for meaningful parts of the platform and contribute to technical choices.
• Growth opportunity - deepen your technical expertise and expand your skills in a high‑stakes domain.

• Hybrid flexibility - combine working from home with collaboration at our modern Amsterdam office.
• Work‑life balance - flexible hours, generous vacation days, and up to 20 days of remote work abroad per year.
• Competitive package - a strong salary, attractive benefits, and professional development opportunities.
• Great environment - a collaborative workplace, fully equipped in‑house gym, and regular team‑building activities.

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