about 3 hours ago
Barcelona, Spain or Madrid, SpainMid Level / Senior / Staff+
H1B Sponsor
Responsibilities
- Design and build core language and runtime features across the Expression Language, Data Mapper, and Decision Engine.
- Own and extend the Rust core, embedding it as a native component inside Ruby and Go services via FFI bindings.
- Help expand Decision Engine from static rules to support formulas.
- Contribute to WASM sandboxing for safe component isolation.
- Partner closely with Product and AI teams to define component requirements.
Requirements
- Deep, hands-on Rust experience at a systems/backend level.
- Working competence in Go with real production ability.
- Proven experience embedding Rust as a library or native extension in other languages.
- Strong fundamentals in algorithms and data structures.
- Comfort operating in a deadline-driven, cross-team environment.
- Experience with AI-assisted workflows and system analysis.
- Experience with systems handling millions of requests/events per day.
- Exceptional technical writing and communication skills.
- Experience planning phased implementations and leading complex projects.
- Proven track record with feature flags, gradual rollouts, and zero-downtime deployments.
- Ability to facilitate architectural decision-making and create technical roadmaps.
- Mentorship mindset and cost analysis capabilities.