Founding Engineer: Agent Systems & AI Orchestration

TechTree; Greater London; On-site; GBP 60,000 - 90,000; Full time

Job summary

TechTree is building an agent-native risk infrastructure and seeks a backend engineer to own the orchestration, evals, and reliability work that turns model calls into trusted product features. You will work on a production-grade stack that pushes frontier APIs toward reliable release standards.

We’re a seed-stage company with seven-figure revenue in months, collaborating with leading enterprises and backed by top UK/US investors.

Qualifications

• Backend engineering in TypeScript with 1-2+ years shipping production LLM features.
• Experience with agent frameworks, tool calling, and multi-step orchestration.
• Production evals: dataset curation, LLM-as-judge failure modes, regression testing under model swaps.
• Strong systems thinking: async, queues, idempotency.
• Comfort being the named owner of AI quality, including saying no when needed.
• Nice to have: Anthropic, OpenAI, or open-weight APIs in production at scale; prompt-injection or agent-security background in compliance, audit, or any domain where correctness is fuzzy and stakes are high.

Responsibilities

• Evals for fuzzy, high-stakes outputs: assessments, policy interpretation, control mapping
• Reliability infrastructure: retries, fallbacks, circuit breakers, prompt versioning
• Set the internal standard for what "good enough to ship" means for AI features

Skills

TypeScript backend

LLM features

Agent frameworks

Tool calling

Orchestration

Dataset curation

LLM evaluation

Async systems

AI quality ownership

Anthropic/OpenAI APIs

Tools

Anthropic API

OpenAI API

Job description

TechTree is building an agent-native risk infrastructure and seeks a backend engineer to own the orchestration, evals, and reliability work that turns model calls into trusted product features. You will work on a production-grade stack that pushes frontier APIs toward reliable release standards.

We’re a seed-stage company with seven-figure revenue in months, collaborating with leading enterprises and backed by top UK/US investors.