Senior Software Engineer - London
H Company · Hybrid London · Hybrid Paris
CHECKED 9H AGO
Frontier labremotesenior
At a glance
Highlights
- Build the evaluation framework behind computer-use agents and models.
- Scale from ~50 benchmarks to 100-200 reliably, fast and cheap.
- Results directly decide model checkpoints and release decisions.
Ideal candidate
A pragmatic backend builder with 5+ years shipping tooling others depend on, who cares deeply if a number is right. Comfortable owning systems end to end and working with researchers and customers.
Requirements
- 5+ years in backend development with production Python
- Built test, QA or evaluation tooling that other teams depended on
- Operated distributed systems on Kubernetes in a public cloud
- Built and shipped systems end to end including APIs and integrations
- Knowledge of relational and non-relational databases and message queues
- Instrumentation with metrics, tracing and monitoring from the start
- remote policy
- Hybrid - 3 office days a week in London, plus Paris trip about every 4-6 weeks
- hiring process
- 30-min call with Talent, 60-min technical challenge, 60-min system design interview, and 30-min final conversation with Ceiran (~3.5 hours total).
Lab profile
About H Company
Pushing superintelligence boundaries with autonomous agentic AI that automates complex multi-step tasks.
What they build
- Autonomous agentic AI systems
- Foundational infrastructure for autonomous AI
Known for
- Post-training
- Model inference and serving
- AI infrastructure
- Safe and responsible AI development
Key facts
- Teams in Paris, London, and the US