Tweag is a software innovation lab with a global team of thoughtful and friendly engineers, working together to build better software by applying mathematics, computer science and the methods of open source.

Our high-profile open source community projects and contributions are driven by experience helping deep tech startup clients quickly scale their engineering performance and execute on high-risk, high-reward projects with confidence.

We are big on composable software: functional, typed, immutable. In our client projects, we apply these principles to build efficient, reproducible and maintainable systems in complex industry sectors such as biotech, retail, finance and autonomous vehicles.

We're looking for front end specialists to join our team and help us move the industry forward. You would work in project teams and on open source projects, honing your skills and techniques and sharing them with others.

You would work either remotely (from almost any country), or on-site at our office in the centre of Paris. Most of our team works remotely, and has done since long before the pandemic.

Who are you?

You’re enthusiastic about understanding what users need, and then delighting them with simple and elegant interfaces, particularly when you have to manage a lot of underlying complexity to do so. You’re familiar with standard industry patterns and tools for web front ends, and are actively interested in incorporating functional programming techniques and even ideas from research to advance the field.

Your skill set will grow constantly with each new client project, so consider applying if you are inquisitive, willing to fail often and adapt quickly. You should be comfortable with feeling out of your depth and rapidly becoming an expert in a new field.

As an engineer at Tweag, you

  • work autonomously, organising and clearly communicating your plans,
  • cultivate good relationships with clients and with colleagues,
  • identify and quickly learn new skills and techniques needed to work in new areas,
  • value high-quality and elegant software,
  • enjoy using principles from one area to help solve problems in another,
  • can explain and discuss complex topics,
  • are highly competent in at least one programming language (Scala, Python, Java, C++, Haskell, Clojure, Typescript, Javascript, Elm, Purescript, or others),
  • have a good understanding of developer tools and techniques such as Git, GitHub/GitLab, CI, testing, Docker, Nix.

In addition, a front end engineer candidate typically has experience with some or all of the following:

  • A modern Javascript framework such as React, Vue, Svelte
  • User experience fundamentals and practices
  • Working iteratively with designers
  • ReasonML, Elm, Purescript, Reflex (Haskell), Typescript or other robustly-typed web languages
  • Up-to-date knowledge of CSS
  • Mobile-first development
  • Server-side rendering
  • SEO and social media link previews
  • Website optimisation tools

What will you be doing?

Engineers at Tweag primarily work in small groups embedded in a client team, collaborating with the client’s engineers and each other. In parallel, Tweag engineers connect and collaborate with each other across project boundaries, teaching, learning and improving our many research and community projects.

Our front-end work on client projects ranges from building single page applications with Purescript to adapting existing web apps using a range of popular technologies, and you might expect to work in a range of such settings, always with an eye on developing, codifying and sharing best practices as open source.


  • The chance to work on interesting problems and work with and learn from amazing people,
  • a flexible work environment, based either remotely or in our Paris office,
  • the opportunity to work on your own innovative projects, if they align with Tweag’s goals,
  • support to grow into other specialist areas.


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