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Build the technology behind millions of journeys every day. As a Backend Developer at NS, you'll shape the future of mobility, work with modern cloud technologies, and have real impact on an app used by over 4 million passengers each month.

• Jij zorgt voor de mobiliteit van Nederland

• Veel ontwikkel-mogelijkheden

• Goede arbeidsvoorwaarden

Why choose NS as a Senior Backend Developer?

• You get the unique opportunity to build the backend of the NS app and key components of NS.nl, serving 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.
• The teams are end-to-end responsible for the entire process: discovery, user research, design, development, and continuous delivery. We build, run, and host the app, web platforms, and backend APIs ourselves: \"You build it, you run it, you love it.\"

What you'll do as a Senior Backend Developer at NS

As a Backend Developer, you will be responsible for further developing and maintaining the backend APIs that power the NS app and website. You'll build user-friendly features that meet the highest quality standards, such as improvements to the journey planner, booking flows, customer service functionality, personalization features, and integrations with mobility partners offering shared transportation services.

You will work closely with business analysts, product owners, and solution architects to translate business and functional requirements into technical solutions.

You will:

• Develop structured, maintainable code and proactively tackle technical debt and legacy systems.
• Help migrate services to our target cloud architecture.
• Monitor applications and respond effectively to incidents and production disruptions.
• Collaborate with other teams to make functionality available in the frontend (mobile app and web).
• Contribute to architectural decisions and the implementation of complex business logic, much of which resides in the backend.
• Drive improvements across team boundaries as one of the technical leaders within the backend community. During bi-weekly backend sessions, you introduce improvements and help ensure their adoption across all six teams.
• Coach colleagues both inside and outside your team through pair programming, code reviews, and knowledge sharing.
• Work test-driven, continuously refactor, and promote pair programming and mob programming as standard practices. This helps improve the quality and robustness of our APIs in both new and legacy code.
• Work together with the Solution Architect to help define the roadmap for migration toward our cloud-native target architecture.

Our Technology Stack

Our backend primarily runs on Java/Kotlin with Spring Boot, complemented by Node.js Lambdas written in TypeScript, hosted on AWS using both containerized and serverless solutions.

We work with:

• Git
• Gradle
• NPM
• Docker
• Azure DevOps (CI/CD)

Don't know every technology yet? No problem. You'll have plenty of opportunities to learn and grow with us.

Hier ga je werken

Based either at our headquarters next to Utrecht Central Station or from home, you'll join a multidisciplinary DevOps team typically consisting of:

• 2 Android Developers
• 2 iOS Developers
• 2 Backend Developers
• 2 Web Developers
• UX/Visual Designer
• Business Analyst
• Tester
• Scrum Master
• Product Owner

A Solution Architect provides guidance on the overall target architecture.

Together, we brainstorm innovative solutions, collaborate intensively, and continuously push the boundaries of our craft. And of course, you'll spend most of your time doing what you love most: building software. We support your growth by providing access to the latest technologies and development practices.

Your team will be one of six teams working together on the NS app and key components of NS.nl. Backend Developers from all teams meet every two weeks to showcase their work, exchange knowledge, and discuss cross-team improvements. These sessions provide a platform where you can make an impact and help shape future direction.

Among developers, we foster a culture where every opinion matters and nothing is ever truly set in stone.

Dit zijn de functie-eisen

You are a fast learner who enjoys continuous improvement and knows how to bring others along on that journey. Agile values such as collaboration, adaptability, and delivering value in short iterations fit naturally with your way of working.

You have strong communication skills, show initiative, and are comfortable making decisions. You take ownership of the systems you build and operate, allowing you to react quickly to production incidents, identify the right solutions, and communicate clearly with stakeholders.

You Also Bring

• Extensive experience building and operating backend applications in production environments, using Java or Kotlin as your primary language.
• Strong software craftsmanship practices, including Test-Driven Development (TDD), refactoring, and pair/mob programming, applied to both new and existing codebases.
• Experience with cloud-based microservices and APIs running in containers and/or serverless environments, preferably on AWS.
• A track record of helping teams and colleagues grow, for example through coaching, introducing standards, or leading technical initiatives across multiple teams.
• Ownership of production systems, including CI/CD pipelines, monitoring, incident resolution, and clear stakeholder communication.
• HBO or university-level working and thinking capabilities.
• Strong communication skills in either Dutch or English.

Nice to Have

Experience with:

• TypeScript / Node.js
• Spring WebFlux or RxJava
• Infrastructure as Code (CDK, CloudFormation)
• Kubernetes or AWS Fargate
• SQL and NoSQL databases
• Mobile app development

Diversity & Inclusion

At NS, diversity and inclusion matter. We believe it makes collaboration more enjoyable and leads to better results. Whatever your background, identity, or beliefs may be, what truly interests us is the perspective and expertise you bring to this role.

Dit zijn de arbeidsvoorwaarden

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Working at NS means having the opportunity to make a real difference in the dynamic world of sustainable mobility. You'll help keep the Netherlands accessible and connected for everyone. At NS, you'll enjoy a high degree of freedom, excellent opportunities for professional growth, and the promise that no two days are ever the same. As one of the most attractive employers in the Netherlands, we offer even more:

• A salary of up to €7,515 gross per month (Scale 61, based on a 36-hour workweek), depending on your experience.
• A 36-hour workweek.
• 144 hours of statutory annual leave (based on full-time employment), plus additional leave depending on your age (at least one extra week).
• The option to exchange three Christian public holidays for three non-Christian holidays.
• A 3% year-end bonus, 8% holiday allowance, and an excellent pension scheme.
• Free second-class train travel throughout the Netherlands; first-class travel is available for a small personal contribution.
• Your family can travel free of charge during off-peak hours.
• Discounts on European rail travel after one year of employment with NS.
• Extensive professional development and learning opportunities.
• A flexible benefits plan, including options such as a bicycle scheme, additional pension contributions, or extra vacation days.

Want to learn more? Check out our employment conditions and collective labour agreement (CAO).

Solliciteren naar deze baan

Apply directly using the application button. Within minutes, you will receive an automatic confirmation of your application, and we will respond within two weeks.

This vacancy may close earlier if we receive a sufficient number of suitable applications, so don't wait too long to apply.

You may address your application to Jeroen van den Berg, Corporate Recruiter IT.

Do you have questions about the recruitment process? Please email Karin from our Front Office at .

Prefer to speak with someone by phone? Contact our Front Office on +31 (0)88 671 3666.

Good to know

• A background screening, including a Certificate of Conduct (VOG), is part of the recruitment process. This also includes signing integrity and confidentiality agreements.
• We believe it's important that everyone feels welcome and valued at NS. This is reflected in our hiring practices.
• We are recruiting for this position directly and are not seeking support from agencies or intermediaries.
• This role is not available on an interim or freelance basis.

You can count on NS

Working at NS means having the opportunity to make a real impact on sustainable mobility. Together, we help keep the Netherlands accessible and connected for everyone.

At NS, you'll enjoy a high degree of freedom and responsibility, and we can promise you one thing: no two days are ever the same.

Our core values are openness and reliability. We are driven by results and continuously strive to move forward.

Sollicitatieprocedure

• Sollicitatie ontvangenWe hebben jouw sollicitatie goed ontvangen en laten je binnen 2 weken weten of we met je verdergaan in deze procedure.
  
• (Online) sollicitatiegesprekWe nodigen je uit voor een sollicitatiegesprek met de recruiter en teammanager. Het gesprek vindt digitaal plaats via Microsoft Teams of bij ons op kantoor.
  
• VervolggesprekWe nodigen je uit voor een vervolggesprek bij ons op kantoor.
  
• Arbeidsvoorwaardengesprek

  Digitaal bespreken we het arbeidsvoorwaardelijke aanbod en heb je de mogelijkheid om vragen te stellen.

• In dienstWelkom, je komt in dienst bij NS!