We are looking for an exceptional individual to join ExoMatter as a Ruby on Rails developer. In this role, you will be working directly on our customer-facing platform and internal tools that power our Materials R&D platform.

Become part of a young deep tech and software startup based in Munich and revolutionize materials development with us. ExoMatter is a spin-off of the German Aerospace Center (DLR) and part of the UnternehmerTUM family of startups. We have a first product on the market with paying customers like Airbus and BSH and a strong upward trajectory.

Why are we doing this?

Our mission is to challenge the status quo of materials development to reduce the worldwide ecological footprint and increase the innovation speed.

We need you to succeed!

Do you think along these lines?

1. If you are equally convinced that only with more efficient materials, can we tackle the climate crisis
2. You are a maker and want to turn visions into reality. See your impact directly!

You love working in a dynamic team: trusting, exchanging feedback, and taking responsibility is most crucial.

As a Ruby on Rails developer, you will be responsible for maintaining and further developing our customer-facing materials screening and computation platform, including our internal management tools. You will work in our small but growing development team, alongside our Python backend developers and our our team of materials scientists.

Knowledge about Materials Science is not required

• You will implement new application functionality, build new interfaces, and maintain the existing codebase
• You will be working directly in our established Ruby on Rails codebase
• You will work on intergrations between our Ruby on Rails application and our Python computation backend, including scaling our queing and pooling systems

• You have 3+ years commercial experience working with both Ruby on Rails, and have ideally built at least one commercial application from scratch
• You have strong experience in testing (specifically with RSpec)
• Ability to work autonomously and self-manage are very important
• Fluent in spoken and written English, German skills are a plus
• You live in Munich or want to move to Munich and are willing to work ca. 50% of your time on-site

Not required, but a plus:

• Experience working with vanilla Javascript, implementing frontend interfaces, UI/UX design/implementation
• Experience working with Sidekiq, and/or other job management systems
• Experience with Python
• Experience working in a startup environment and/or in a small team

• Competitive package of salary, (virtual) stock options, and benefits
• Attractive company culture in an early-stage startup
• Public transportation ticket for Munich and entire Germany (Deutschlandticket, 50 EUR per month covered by ExoMatter)
• Flexible work hours with strong focus on work-life balance far beyond industry standard
• Free choice between latest ThinkPads or MacBooks for personal and private use
• Full time position, part-time work possible upon agreement
• Hybrid work with flexible arrangement between on-site work in new Munich office and remote work

Start date: 1 July 2025.