Company: Wasmer ( )
Type: Full-time
Location: Remote (CET ± 2)
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Build an operating system that runs everywhere

Siga leyendo para descubrir lo que necesitará para tener éxito en este puesto, incluyendo habilidades, cualificaciones y experiencia.

Most engineers spend their careers using operating systems. A few get to build one. This role is for the second group.

At Wasmer, we're building WASIX — an OS emulation layer that brings full POSIX semantics to WebAssembly: threads, processes, fork(), sockets, TTYs, signals, the works. It's the kind of problem where you're reading Linux kernel source in one tab and the WebAssembly spec in another, deciding how mmap should behave on a platform that was never designed to have one.
If that sentence made you lean in rather than close the tab, keep reading.

What you'll work on
- WASIX itself — designing and implementing syscall semantics, process and threading models, virtual filesystems, and networking stacks on top of WebAssembly. Where Linux behavior and Wasm constraints collide, you'll be the one deciding what "correct" means.




- The Wasmer runtime — the sandboxing, scheduling, and memory-management machinery that makes thousands of Wasm "processes" run safely and fast on a single host. Think hypervisor problems, at a different layer of the stack.
- Making real software just work — porting and running battle-tested Unix software (curl, bash, PostgreSQL-class programs) unmodified on WASIX, and fixing everything that breaks along the way.
- Open source - a good chunk of your work will ship publicly, in one of Wasmers open-source repositories

You're probably a fit if you
- Have 5+ years of systems-level engineering experience, with real-world work on Linux internals, hypervisors (KVM, Xen, Firecracker, etc.), or comparable low-level runtimes — not just as a user, but as someone who has debugged, extended, or built them.
- Have a genuine, self-driven interest in OS and hypervisor design — you have opinions about schedul

📌 Senior Operating Systems (Mallorca)
🏢 WASMER
📍 Mallorca