Senior Frontend Engineer (Freelance)

NN Personeel B.V.; Den Haag; Hybrid; EUR 83,000 - 124,000; Part time

Benefits offered by this job

Hybrid working

Training budget

International environment

Job summary

NN Group Netherlands, based in The Hague, seeks a Senior Frontend Engineer to drive a product-oriented tech culture. You will help build and modernize critical frontend services, collaborating with a multinational team to deliver scalable, secure solutions for 500,000+ customers.

The role offers hybrid working arrangements, a start date around 1 October for six months with extension potential, and an international, knowledge-sharing environment that values continuous learning and high-quality

Qualifications

• 7+ years of experience building production-grade applications with React Native, React, and TypeScript.
• Strong experience with designing and maintaining shared libraries or SDKs, focusing on API design and backward compatibility.
• Solid understanding of mobile authentication, security, and secure storage.

Responsibilities

• Work with modern technologies such as React Native, React, TypeScript, AWS and GraphQL.
• Build new projects from scratch and modernize existing applications.
• Take ownership of services used by customers and within the organization.

Skills

React Native

React

TypeScript

Mobile security

CI/CD

Agile teams

Tools

AWS

GraphQL

SDK design

Job description

Senior Frontend Engineer

Get ready to help drive digital change at Nationale Nederlanden (NN), one of the Netherlands' biggest financial services companies. As a Senior Frontend Engineer, you will contribute to our goal of transforming our company to a product oriented tech company. Based in The Hague, you will make a difference in over 500,000 customers' lives every day. Your new job could very well make a big difference in your work-life balance, too. We're famous for it, and you'll enjoy plenty of freedom in your role, with all the perks of hybrid working. The start date is 1st of October, with a duration of six months, with the possibility of extension.

What you are going to do

As a Senior Frontend Engineer, you will help us create a more tech-driven culture at NN. In this role, you will:

• Work with modern technologies such as React Native, Typescript, AWS, and GraphQL
• Build new projects from scratch and contribute to expanding or modernizing existing applications
• Take ownership of services used directly by customers or embedded throughout the organization
• Collaborate with a multidisciplinary team to design, develop, and maintain reliable and scalable solutions

The team owns dozens of services that support both our end users and the broader NN organization.

What we offer you

Our people are the driving force behind our organisation. We value the knowledge and expertise you bring. We believe that your temporary commitment can take our organisation to a higher level.

We offer you:

• Competitive hourly rate depending on your knowledge and experience
• Startdate as soon as possible for +/- 6 months
• Hybrid way of working, partly from home and partly from the office
• International working environment with loads of knowledge sharing

Who you are

An all-round software engineer able to work comfortably on front-end projects, we are looking for someone who can develop high-quality code and have high-be curious, and actively acquires new skills, new methods and processes to make our customers even happier. The ideal candidate has passion for technology and wants to learn continuously and push the team to reach our common goals.

• 7+ years of experience building production-grade applications with React Native, React, and TypeScript
• Experience designing and maintaining shared libraries or SDKs, with a strong focus on API design, versioning, and backward compatibility
• Strong understanding of mobile authentication and security, including biometrics, PIN/OTP flows, secure storage, and identity verification
• Experience working across JavaScript and native mobile platforms (iOS/Android), collaborating on React Native bridge integrations
• Strong software engineering practices, including testing, code quality, CI/CD, and delivering reliable, maintainable solutions in Agile teams

Who you will work with

You are going to be part of a team of unique awesome individuals with different backgrounds and cultures, we embrace diversity as an instrument to produce an even richer experience for both colleagues and customers. As all our tech departments are international with English being the main language. Relevant training will be accommodated when needed.

Benefits of working for NN Group Netherlands

Continuous development – Your career progression matters. We support you with a wide range of learning opportunities and a generous training budget to help you reach your full potential.

Meaningful impact – At NN, we invest our time and expertise in making a meaningful difference – for people and the planet. Purpose-driven work is part of our DNA.

Work-life balance – Vitality is key. Our diverse health and well-being offerings help you stay energised and balanced, both at work and beyond.

Diversity & Inclusion

Our approach to diversity and inclusion is simple. It is about embracing everyone. Our networks play a crucial role in achieving our D&I goals. They aim for meaningful change and create many opportunities to engage, connect and support colleagues. Everyone at NN can take an active part in multiple networks including NN Pride, NN Cultural Diversity Network, NN Young Professionals, Woman in Leadership Network and NN Neurodiversity network.

Top Employer

We are proud to be certified as a Top Employer for the 15th year in a row in 2026. The Top Employers Institute certificate recognizes organizations that consciously choose to put their employees first.