Frontend Developer

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Frontend Developer

Slimmer AI is an AI B2B venture studio based in Amsterdam and Groningen, and our people are our greatest asset. We're looking for an experienced frontend developer to join our ventures tech team to build the next great software products and experiences! 

We invest in and co-build B2B SaaS companies with inspiring founders who use AI to disrupt the status quo—helping them build great products and sustainable companies. We believe AI is the single most transformative technology of our time and that it will fundamentally change the way we work. 

Full-time / Part-time · Amsterdam/Groningen

About the role

We are looking for a frontend developer with the heart of an entrepreneur. Leveraging your experiences in professional software development, you'll help turn visions in to the first steps of real products. Together with a team of backend/software and AI/ML engineers, UX/UI researchers and designers, you will build actual minimum viable products to validate our products with real-world users.

What you'll do

Every day will look different. Here's a high level overview of your scope and remit:

  • You'll be responsible for building web applications for very early products (at the MVP stage / 0-1) while we seek product market fit for scaling (going 1-10).
  • You'll work with the development team, as well as UX/UI researchers and designers. 
  • You'll work closely with our back-end and full-stack developers to deliver consistent and reliable web experience. 
  • You'll contribute your thoughts and experiences to improve usability for our customers.

About your skills and expertise

Must haves:

  • Medior+ - Min 2 years of experience
  • A front-end focused engineer who has some experience building in the backend, and a desire to continue leaning and building backend components
  • Deeper front-end experience building products with React, Javascript/Typescript, and associated technologies like Next, Nuxt, HTML, CSS, etc.
  • Ability to take designs from mock-up systems like Figma, and turn them into accessible, responsive, and accurate interfaces
  • Experience building systems which leverage development best practices around version control with git, testing, and CI/CD
  • Familiarity with software development principles and pitfalls like DRY, KISS, premature optimization, etc.
  • Previous experience working directly with product owners and designers in an Agile or Scrum team.
  • Ability to work incrementally. Assess and communicate trade-offs between rapid development (MVP) and sustainable systems (scalability, reliability)


  • Previous experience building products from scratch, in a start-up like environment
  • Experience building products in the cloud, in particular AWS
  • Experience applying common UX/UI good practices
  • Experience setting up FE usage monitoring
  • Experience building backend components in Python using technologies like Django, FastAPI, Flask, or other common Python framework


  • A portfolio and/or open source project on which you have worked previously
  • Experience building UX designs in tools like Figma

What we offer

Slimmer AI offers a fun, innovative, and dynamic entrepreneurial environment. We hire quirky talents who dare to take a stand and explore new directions. We empower our team to be self-leading, take initiative, and experiment. With us, you can build great AI software companies and a rewarding career in tech.

In more detail, we offer:

  • A competitive salary, with flexible work schedules and hybrid-friendly work; we also provide €200 to set up your home office + €2 per day for your work-from-home days.
  • 25* days of paid annual leave + your birthday off! Also, enjoy additional days off for your big life moments, such as moving (+1) or getting married (+2).
  • Unlimited access to the Udemy learning platform! Plus a personal budget for additional learning needs (like conference passes and books). 
  • Pension administration support (and a contribution to get you started), as well as insurances and other protections (WGA, WIA, Accident).
  • Company-wide incentive programs, such as Phantom Shares, yearly bonus, company trips, and the €1000 (net) employee referral bonus.

....Plus lots of cake, fun team events, a beer-stocked fridge, the typical pool table, and even a massage chair!

Most importantly, we offer an environment for you to continuously learn with a fun, brilliant, international, and diverse team, as we build the next great AI products and businesses.

If you think this sounds ‘gezellig’, we’d love to hear from you!

*40-hour contract