Senior Mobile Frontend Engineer (Freelance)

NN Group; Den Haag; Hybrid; EUR 69,000 - 96,000; Full time

Benefits offered by this job

Hybrid working

Competitive hourly rate

International environment

Job summary

Nationale Nederlanden (NN) in The Hague is seeking a Senior Mobile Frontend Engineer to help drive digital change and build customer-facing mobile apps.

You will work with React Native, TypeScript, AWS and GraphQL, take ownership of services used by customers, and collaborate with a multidisciplinary team in a hybrid environment.

Qualifications

• 7+ years of production-grade mobile development experience with React Native, React and TypeScript.
• Experience designing and maintaining shared libraries or SDKs with API design and versioning.
• Strong knowledge of mobile authentication and security (biometrics, PIN/OTP, secure storage).
• Experience across JavaScript and native iOS/Android with React Native bridges.
• Strong practices in testing, CI/CD, and Agile teams.

Responsibilities

• Develop new mobile features and migrate existing apps with React Native.
• Collaborate with cross-functional teams to design scalable solutions.
• Own services used by customers and ensure reliability and performance.
• Contribute to code quality, testing, and CI/CD pipelines.

Skills

React Native

React

TypeScript

API design

Mobile security

Tools

React Native

React

TypeScript

AWS

GraphQL

Job description

Get ready to help drive digital change at Nationale Nederlanden (NN), one of the Netherlands' biggest financial services companies. As a Senior Mobile Frontend Engineer, you will contribute to our goal of transforming our company to a productoriented 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.

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What you are going to do

As a Senior Mobile 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
• 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.