Senior JavaScript Engineer (Back-end)

Apply now

Senior JavaScript Engineer (Back-end)

Full-time · Utrecht, The Netherlands

At Lab Digital, we create digital products for our clients. These are global e-commerce platforms, content websites or high-traffic middleware solutions. All based on cloud native technology, often in combination with headless SaaS products.

We have a passion for technology. We get excited about solving new challenges through an elegant approach with tech solutions that best fits the demand. We do this in multidisciplinary teams working for long-term, mostly international customers.

About the role

The products we deliver are built using cloud-native technology, using a mix of serverless and container orchestration platforms to run our nodejs-based backend services.

Our backend services range from integrations with SaaS products (commercetools, Contentstack or Contentful), external systems such as payment providers and ERP systems, to federated GraphQL solutions to access data in a consistent way.

We are committed to delivering sustainable and high quality software. This includes working with TypeScript and writing extensive unit and integration tests using Jest and Cypress/Playwright. We also have a strong focus on code reusability within, and across, projects.

Our work takes place in sprints of 2 to 3 weeks, in teams consisting of (UX) designers, QA specialists, business analysts, solution architects, a scrum master, a project manager. Within this team you are responsible for delivering high quality software together with the team and the client. 


As a Senior JavaScript engineer you work with your team to realise technical solutions that fit the demand. You will also bring substantial features independently from concept to production. This means that you are responsible for, among other things:

  • Realising technical integrations with external systems (for example headless CMS and e-commerce platforms, payment providers, etc) that are robust, scalable and fault-tolerant.
  • Translate requirements into a technical architecture, solution and final implementation.
  • Create well-documented, high-performance rest APIs and GraphQL endpoints.
  • Support teammates in their work and provide feedback in a well-structured manner.
  • Help define and improve our internal standards regarding code style, maintainability and scalability, among others.


  • 5+ years of experience with the development of (web) applications

  • 3+ years of experience developing NodeJS based server-side javascript/typescript applications with frameworks like Express or Apollo.
  • Good knowledge of modern software development techniques (unit/integration testing, ci/cd pipelines, etc).
  • Experience running NodeJS applications on containerized (Docker/Kubernetes) and/or serverless (Lambda) functions.
  • Communicatively strong in word and writing (and thus able to deliver technical documentation, for example)

Nice to have

  • Experience with event driven software architecture and messaging queues such as SQS, Kafka, RabbitMQ
  • Knowledge of AWS/Azure and infrastructure as code principles (Terraform)
  • Experience writing applications in the e-commerce domain such as payment solutions, links to ERP and order systems, etc.

Knowledge sharing

Laptop, headphones and more

Pension plan

€4.500 - € 5.750 per month

Flexible hours

25 vacation days

What we offer you

  • Starting salary of at least € 4.500 per month and depending on experience and growth, it can go towards € 5.750. 
  • Opportunities to grow in seniority level, which also includes a different salary level.
  • In addition on a yearly basis: 25 vacation days, a favorable pension plan and bonus of one month salary in case of a positive operating result.
  • Hybrid working and flexible hours in consultation with your team
  • No concessions on gear you need to do your job well including laptop, headphones and more.
  • We have strong engineering culture and are active in the Open Source community. Check out our 70+ projects on our GitHub profile and
  • We work for well-known large international organizations.
  • We are a growing company and keep a constant focus on your development, drivers and ambitions. You may work on both personal and professional goals with us through a growth plan.
  • Knowledge sharing through a bi-weekly Javascript meeting and Lab Academy, among other things.

Work should be fun, substantive and also with each other. We like to look at your ambitions together with you and help you you realize them.

"Because we work with innovative technologies and follow new developments closely, there is something new to learn on every project, which makes the work fun, dynamic and challenging."

Mike, Technical Lead

Your colleagues

Our team consist of 80+ colleagues. Curious about who your colleagues will be? Take a look at the profiles of Boris, Mike, Casper & Bram

Boris Besemer

Lead Software Engineer

Mike de Bock

Senior Software Engineer

Casper van Koppenhagen

Digital Consultant

Bram Kaashoek

Senior Software Engineer

Let's talk

Are you the person we are looking for? 
Apply for this position and we would love to talk to you.

Lab Digital does not work with third parties to fill this position.