Build systems, not just services.
Work across products, not inside one codebase.
Own problems from first question to production.
The role
We run a portfolio of mobile products used by millions of people.
Our engineering team works across that portfolio.
You won't join a permanent team attached to one app. You might spend your first few weeks improving the backend of one product because that's where the biggest technical need is. A month later, you could be designing a service for another, helping resolve a production incident elsewhere, or improving infrastructure used across several products.
That's intentional.
We want engineers who can understand a system quickly, find the real problem, and move between different technical contexts without needing everything to stay familiar.
We're looking for a Senior Backend Engineer who combines depth in backend engineering with breadth across systems, infrastructure, architecture, and product.
Think T-shaped : deep in backend engineering, broad enough to understand the systems around it.
How engineering works here




There is not always a perfectly specified ticket waiting for you.
Usually, there is a problem.
A service is struggling under load.
A database model no longer fits the product.
A team needs to test something quickly.
An API needs redesigning.
Something breaks in production.
Your job is to understand the context, decide what engineering should do next, and build it.
That means asking questions beyond implementation:
What problem are we actually solving?
What happens upstream and downstream?
What breaks if usage grows 5x?
What trade-off are we making?
Does this need a new service at all?
We care more about how you reason about the whole system than how well you know one framework.
What you'll work with
Go is our backend standard.
Roughly 80–90% of our backend work is Go , with the rest mainly in Node.js and Python .
You don't need to have spent your whole career writing Go. You might come from Java, Kotlin, Python, Nod

📌 Senior Backend Engineer (Barcelona)
🏢 BlueThrone
📍 Barcelona