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Senior Software Engineer - London

hcompanyHybrid LondonEngineering
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Salary
Not listed
Job type
Full-time
Work mode
Remote
Experience
Senior · 5+ yrs
Posted
2 Oct 2026
Status
Open · checked 7d ago

About this role

This role suits an experienced backend engineer with a strong background in distributed systems who wants to build evaluation tooling for computer-use agents. Based in hybrid London, this position involves scaling and optimizing the core evaluation framework used by researchers and deployment engineers.

Role Overview

H is hiring a Senior Software Engineer in London for a hybrid position that requires three office days per week and occasional travel to Paris. The person in this role will build, scale, and maintain the evaluation framework that runs dozens of benchmarks across desktop apps, web applications, and command-line environments. The work directly impacts research decisions, model releases, and customer workflow measurements.

Key Responsibilities

Provide integration support for researchers and forward deployed engineers to incorporate new benchmarks into the framework efficiently
Establish standards for benchmark onboarding and build validation checks to enforce them
Manage scheduling and observability to optimize cluster capacity and prevent evaluation job queues
Ensure reproducible results across trials to support reliable model release decisions
Adapt to various technology stacks required by different benchmarks, ranging from cluster tuning to browser extensions and desktop environments
Collaborate with customers ranging from individual developers to large enterprises to automate measurement needs and feed results back into model harnesses

Requirements

Minimum of 5 years of experience in backend development centered on production Python
Practical experience using coding agents to accelerate development without sacrificing quality
Background in building test, quality assurance, or evaluation tooling relied upon by other teams
Experience operating distributed systems on Kubernetes within a public cloud, with AWS preferred
Demonstrated track record of building and shipping end-to-end systems, including REST or GraphQL APIs and external service integrations
Working knowledge of relational and non-relational databases, alongside message queues such as SQS, RabbitMQ, or Kafka
Habit of instrumenting software from inception using metrics, tracing, and monitoring

Nice to Have

Prior experience measuring large language model quality or building autonomous agents
Experience packaging and running workloads using Docker and virtual machines
Familiarity with Temporal, Dask, FastAPI, PostgreSQL, Grafana, or Datadog
Experience automating web or desktop software using Playwright, Selenium, or custom browser extensions
History of setting engineering standards through code reviews, design reviews, or mentorship

Skills and Tools

Python
Kubernetes
AWS
REST and GraphQL APIs
SQS, RabbitMQ, Kafka
Docker
Temporal, Dask, FastAPI
PostgreSQL
Grafana, Datadog
Playwright, Selenium

Salary and Benefits

Competitive package

About the Company

H develops computer-use agents and underlying models accessed through a managed API and deployed into enterprise workflows. The organization emphasizes public transparency by publishing detailed trajectories and benchmark metrics for its releases.

How to Apply

Interested candidates should apply on the official company careers page.

Skills and tech stack

Questions candidates ask

What is the location requirement for this position?

This position is hybrid in London, requiring three office days per week and a trip to Paris roughly once every four to six weeks.

Is a machine learning background required?

No, a background in machine learning is not required for this role.

How many years of experience are required?

The role requires 5 or more years of experience in backend development.

What does the interview process involve?

The hiring process includes a 30-minute call with the talent team, a 60-minute technical challenge, a 60-minute system design interview, and a 30-minute final conversation with VP Engineering Ceiran Chapman.

Ready to apply?

The application is on the official hcompany careers page.

Apply on company site