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Senior Software Engineer - London

H Company· Engineering
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Hybrid (Hybrid London), Hybrid (Hybrid Paris)Full-timePosted 11mo ago

About the role

Senior backend-focused role building and maintaining the evaluation framework for H's computer-use agents, enabling reliable, fast, and cost-effective benchmark runs and integrations with new benchmarks across web apps, desktop applications, and command line.

Responsibilities

  • Integration support for researchers and forward deployed engineers bringing in a benchmark, with a shorter path each time.
  • Setting the standard for how a benchmark enters the framework, and building the checks that enforce it.
  • Scheduling and observability, so cluster capacity isn't left idle while evaluation jobs queue.
  • Reproducible results across trials, so a release decision rests on numbers that hold.
  • Whatever stack a benchmark calls for. One week that's cluster tuning; the next it's a browser extension or desktop environments.
  • Time with customers, from single developers to large companies, to find out what they want measured, then automating it so the results flow back into our harnesses and models.

Qualifications

  • Have spent 5+ years in backend development, with production Python at the core, and use coding agents to go faster without letting quality drop.
  • Have built test, QA or evaluation tooling that other teams depended on, and care whether a number is right.
  • Have operated distributed systems on Kubernetes in a public cloud. AWS experience helps most.
  • Have built and shipped systems end to end, including APIs (REST or GraphQL) and integrations with outside services.
  • Know relational and non-relational databases, and message queues such as SQS, RabbitMQ or Kafka.
  • Instrument what you build, with metrics, tracing and monitoring from the start.

Skills

Required:Backend development (Python)Distributed systemsAPIs (REST or GraphQL)

Benefits

  • We offer a competitive package.
Last updated Oct 8, 2026. Interested? Apply on the company site.

About H Company

H is an AI Research Lab and Product Company

H is an AI Research Lab and Product Company

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