Full-stack Software Engineer (Product)

8 days ago

London, United Kingdom or San Francisco, CA, USAMid Level

H1B sponsor

Base Salary

$222k - $290k/yr

Responsibilities

Design, build, and ship Watcher features across the full stack, including agent hooks, CLI tooling, ingestion and grading pipelines, monitoring UIs, and dashboards.
Own features from ambiguous requirements and customer conversations through technical decisions, production deployment, and iteration.
Build integrations with coding agents, LLM gateways, enterprise security systems, SIEM platforms, and security operations workflows.
Design and operate real-time backend systems handling large volumes of agent logs, including scalable data models and storage.
Own reliability through error handling, graceful degradation, logging, metrics, tracing, alerting, and low-latency blocking paths.
Support cloud-hosted, on-premises, and local deployment models, including tenant isolation, encryption, and access controls.
Productionize monitoring research such as new monitors, grading strategies, and backtesting results.
Talk to customers, debug issues in customer environments, and incorporate feedback into the product roadmap.

At least 4 years of experience building and operating production software with real users.
Strong backend and frontend capability, including APIs, data pipelines, databases, cloud infrastructure, and modern web UI development.
Strong working experience with Python and TypeScript.
Experience using Claude Code, Codex, Cursor, or similar tools heavily, or experience building agents or agent tooling.
Ability to own substantial product areas, make decisions with incomplete information, and deliver at high volume.
Ability to talk to users, translate vague requirements into concrete designs, and make product tradeoffs.
Experience with developer tools, monitoring or observability systems, security products, real-time or large-scale data processing, enterprise or on-premises deployments, or early-stage startups is valued.
Experience building LLM-powered applications, including LLM-as-judge systems, evaluation pipelines, or familiarity with Inspect, is valued.
Formal AI safety and management experience are not required.

Market-competitive salary, equity, and competitive benefits.
Flexible work hours and schedule, unlimited vacation, and unlimited sick leave.
Up to six months of paid parental leave.
Comprehensive health, dental, and vision insurance.
Retirement savings with competitive employer matching, including 401(k) for US employees.
Lunch, dinner, and snacks provided on workdays.
Paid work trips, staff retreats, business trips, and relevant conferences.
$1,000 USD annual professional development budget.
Relocation support and visa fees if applicable.
Full-time, in-person work from the London or San Francisco office, with flexible hours and some work-from-home arrangements.
The company provides an effectively unlimited token budget for engineering work.

1-10 employees