Android Developer Team Guide

Build the app that millions of travellers rely on every day. Join Team Guide at NS and help shape the future of sustainable mobility. Work with modern Android technologies, own features end-to-end, and make a direct impact on over 4 million monthly users.

• Utrecht
• 32 - 36 uur

Why choose NS as an Android Developer?

• You’ll have the unique opportunity to build and improve an app used by over 4 million users every month.
• You’ll join a forward-thinking DevOps team with the freedom to contribute ideas and experiment with new technologies.
• Teams are fully responsible for the entire process, from discovery and user research to design, development, and continuous improvement. We build, host, and operate our own app, web services, and backend APIs: "You build it, you run it, you love it."

“What excites me most is the scale. Every feature we build can improve the journey of millions of travellers. We have the freedom to innovate, work with modern Android technologies, and see our ideas make a real impact every day.”
Android Developer, Team Guide

What you'll do as an Android Developer at NS

As an Android Developer, you will be responsible for the continued development and maintenance of the NS app. You'll build user-friendly features that meet the highest quality standards. Examples include improvements to the journey planner, booking flow, customer service features, personalization, and integrations with mobility partners.

• Collaborate closely with UX designers to create user interfaces and features that meet customer needs.
• Work together with the Business Analyst and Product Owner to translate functional and business requirements into technical solutions.
• Write clean, well-structured code and proactively tackle legacy code when you encounter it.
• Improve the quality, reliability, and robustness of the NS app by maintaining strong code coverage.
• Stay up to date with the latest Android development trends and technologies.

Hier ga je werken

You will join Team Guide, part of the Passenger Experience domain (Reizigers). You can work from our headquarters near Utrecht Central Station or from home.

Team Guide is a multidisciplinary DevOps team consisting of:

• Android Developers
• iOS Developers
• Backend Developers
• A UX/Visual Designer
• A Business Analyst
• A Scrum Master
• A Product Owner

Team Guide plays a key role in informing and guiding millions of travelers every day. The team develops and maintains innovative features that provide travelers with relevant information at the right moment to make traveling with NS easier. Also the team is in charge of proactively warning for planned works, disruptions, and incidents. Example features include push notifications about engineering works, disruption alerts, personalized travel information, and proactive travel guidance based on expected journeys.

Through these solutions, Team Guide directly contributes to several strategic NS objectives, including increasing app usage, further personalizing the travel experience, improving IT quality, and reducing customer contact by providing travelers with faster and more accurate information.

Android developers across NS meet weekly to showcase their work, discuss shared challenges, and drive technical improvements. During these sessions, you can make a real impact and help shape the future direction of Android development within NS.

The Codebase

The NS app codebase consists of more than 120 modules, structured according to Clean Architecture principles.

While part of the application still contains legacy code (including Java), the team actively modernizes and replaces outdated components. All new features are built using:

• Kotlin
• Kotlin Coroutines
• Jetpack Compose
• Our in-house design system Nessie in Jetpack Compose (NS Design System)

Dit zijn de functie-eisen

You are eager to learn and quick to adapt. You identify opportunities for improvement and bring others along in realizing them. Important Agile principles such as collaboration, responding to change, and delivering value in short iterations fit naturally with your way of working. You communicate effectively, show initiative, and are confident in making decisions.

What you'll bring

• A Bachelor's or Master's degree in Software Engineering or a related field.
• At least 2-3 years of experience developing Android applications using Kotlin, Kotlin Coroutines, and Jetpack Compose within a Scrum or DevOps environment.
• Experience with Clean Architecture and writing unit tests and Espresso tests.
• Strong team spirit. Your flexibility and collaborative mindset help strengthen the team.
• Enthusiasm, a strong sense of ownership, and an interest beyond your own area of expertise.
• A genuine interest in developments within the Android ecosystemcontinuous learning, both technical as well as personal.
• The ability to communicate effectively in either Dutch or English.

Nice to have

Experience with:

• Analytics, Test-Driven Development (TDD), and Data-Driven Development.
• CI/CD pipelines.
• Code modularization.
• Feature flags and A/B testing.
• Refactoring legacy code.
• Snapshot testing tools such as Paparazzi.
• Building digitally accessible mobile applications.

Experience working as a T-shaped professional with expertise in one area and a willingness to contribute across multiple disciplines.

A full-stack mindset, capable of looking beyond your own specialization and collaborating across the entire development lifecycle.

Dit zijn de arbeidsvoorwaarden

Working at NS means you can make a real difference in the dynamic world of sustainable mobility. You help keep the Netherlands accessible and connected for everyone. At NS, you'll enjoy a great deal of freedom and plenty of opportunities for personal and professional development.

• A salary in Scale 60, ranging from €3,743 to €6,491 gross per month (based on a 36-hour workweek and depending on your experience)
• The opportunity to work from home and enjoy flexible working hours (by mutual agreement)
• A 36-hour working week
• A 3% year-end bonus, 8% holiday allowance, and an excellent pension scheme
• A permanent contract after one year, subject to good performance
• Free travel by train in 2nd class; travel in 1st class is available for a small personal contribution
• Your family can travel free of charge during off-peak hours
• 144 hours of statutory leave (based on full-time employment), plus additional leave depending on age (at least one extra week)
• The option to exchange three Christian public holidays for three non-Christian public holidays
• Discounts on European rail travel after one year of employment with NS
• A flexible benefits plan, including options such as a bike scheme, additional pension contributions, or extra vacation days

Want to learn more? Take a look at our employment conditions and collective labour agreement (CAO).

Good to know

• A background screening, including a Certificate of Good Conduct (VOG), is part of the recruitment process. This also includes signing an integrity declaration and a confidentiality agreement.