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About the Role

As a Senior Software Engineer at Nextens, you own meaningful parts of a business-critical platform used daily by thousands of professionals. You design and deliver robust software, make sound technical choices, and help raise the quality of a platform where accuracy, reliability, and maintainability truly matter. You enjoy complex engineering challenges and bring the judgement to balance quality, delivery, and long-term maintainability. Together with domain experts, fellow engineers, and product owners, you translate changing fiscal requirements into software 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.

Responsibilities

Design, build, and evolve core modules for tax filing and compliance, taking ownership from solution design through long-term maintainability.
Use modern engineering practices, including AI-assisted development tools where appropriate, to improve productivity, quality, and maintainability.
Develop and improve back-end and front-end components, APIs, interfaces, and integrations for a scalable, stable platform 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.
Improve engineering quality through testing, refactoring, code reviews, and mentoring other engineers.

Requirements

A bachelor’s degree in Computer Science, Software Engineering, or equivalent experience.
4+ years of hands-on software development experience, with evidence of increasing technical ownership, preferably with C#, .NET, Azure, and modern web technologies.
A strong quality mindset, including testing, refactoring, code reviews, clean architecture principles, and coaching others to raise engineering standards.
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.

Skills

C#
.NET
Azure
modern web technologies
Angular
React

Location

Amsterdam
NLD

Work Type

Hybrid
Full-Time

Experience Level

Senior
4+ years

Education Level

Bachelor’s degree in Computer Science, Software Engineering, or equivalent experience.

Salary/Compensations

€65,300 - €108,800

Benefits

Hybrid flexibility
Work-life balance
Flexible hours
Generous vacation days
Up to 20 days of remote work abroad per year
Competitive package
Strong salary
Attractive benefits
Professional development opportunities
Great environment
Collaborative workplace
Fully equipped in-house gym
Regular team-building activities
Country specific benefits

About the Company

Nextens develops the leading tax and compliance platform for professionals in the Netherlands. Trusted by thousands of experts, our software supports more than 1 million filings each year and helps organizations navigate evolving tax rules, high-volume data, and complex 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.
RELX is a global provider of information-based analytics and decision tools for professional and business customers, enabling them to make better decisions, get better results and be more productive. Our purpose is to benefit society by developing products that help researchers advance scientific knowledge; doctors and nurses improve the lives of patients; lawyers promote the rule of law and achieve justice and fair results for their clients; businesses and governments prevent fraud; consumers access financial services and get fair prices on insurance; and customers learn about markets and complete transactions. Our purpose guides our actions beyond the products that we develop. It defines us as a company. Every day across RELX our employees are inspired to undertake initiatives that make unique contributions to society and the communities in which we operate.

Equal Opportunity

We are an equal opportunity employer: qualified applicants are considered for and treated during employment without regard to race, color, creed, religion, sex, national origin, citizenship status, disability status, protected veteran status, age, marital status, sexual orientation, gender identity, genetic information, or any other characteristic protected by law. USA Job Seekers: EEO Know Your Rights.