Freelance Backend Engineer
Berlin or Remote
About Rey
Rey is a tool that lets anyone build mobile apps visually. We believe in a world where the power of software creation is accessible to everyone, not just those with specialised skills or financial resources. With Rey, we’re starting with apps for smartphones, the most universal computing devices today.
We're currently in closed beta with 3 pilot customers and 2 apps already live on the app stores (Lume and Recharge). Today, users can already use Rey to design interfaces, define interactions, connect to built-in databases, and deploy to the app stores.
But this is just the beginning. As a team, we'll continue to take on complex design and engineering challenges — from expanding our building block library, to automating deployment pipelines, to building AI copilot experiences. If you’re excited by hard problems and big mission, this is the perfect time to join us.
About the role
We’re looking for a Backend Engineer to help us take a key step in our product journey: building out our first deployment feature. This will involve working with our Phoenix/Elixir backend to enable users to publish their apps seamlessly to the stores.
This is a project-based freelance role to start. If there’s a strong mutual fit, we’d love to continue collaborating on additional backend projects on an ad-hoc basis.
What you’ll work on
Collaborating with Linh (founder and product designer) and Miguel (freelance Flutter engineer) to design, scope and ship features end-to-end
Architecting and implementing our first app deployment pipeline in Phoenix/Elixir
Designing APIs and backend logic that integrate with our Flutter-based frontend
Ensuring scalability and reliability for app deployments
What we’re looking for
Strong experience with backend development, ideally in Phoenix/Elixir
Proven track record of shipping production-grade software, ideally including deployment pipelines or CI/CD flows (e.g. Github Actions)
Pragmatic approach to problem-solving: you balance speed and quality, and know how to break down complex problems into clear steps
Strong communication skills: you explain technical tradeoffs clearly, ask good questions, and collaborate smoothly across disciplines
How to apply
If you're excited about building the future of mobile app creation with a small yet ambitious team, write me at linh@reyapp.io and let's chat!