Senior Backend Engineer (Rust | Serverless)

Contract | Remote (Spain-based) | Spanish-speaking

We are working with a stealth tech company building a high-performance, real-time platform - and they’re looking for a Senior Backend Engineer to own the heart of their system.

This isn’t your typical backend job. You’ll be building the core “brain” of the platform , where speed, efficiency, and smart design truly matter.

What you’ll be doing:

• Writing high-performance Rust (async/Tokio)
• Building and scaling serverless, event-driven systems in AWS
• Owning your infrastructure using Terraform / IaC
• Designing APIs and core backend logic
• Profiling and optimizing systems to shave off milliseconds and reduce compute costs

If you enjoy seeing the direct impact of your work, this role will provide that every day.

Who they’re looking for:

• Strong experience with Rust (ownership, lifetimes, async)
• Experience with serverless / event-driven architectures
• Comfortable with AWS (Lambda, DynamoDB, SQS, API Gateway)
• A performance-first mindset - profiling and optimization is part of your DNA
• Spanish-speaking (team communicates in Spanish)
• Self-motivated and able to work remotely from Spain

Tech Stack

Rust • AWS • Lambda • SQS • SNS • API Gateway • DynamoDB • Terraform • CloudWatch

Why it’s worth a look

• Work fully remote from anywhere in Spain
• High-impact role with a small, expert engineering team
• Real engineering challenges - no busywork, no legacy baggage
• Opportunity to own critical parts of the platform