Staff AI Engineer — Autonomous Agent Systems (Production)

Dex; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Dex is building production infrastructure for enterprise AI, focusing on autonomous agents and safe, scalable design. You will join as one of two founding Member of Technical Staff seats in London, owning applied AI and agent architecture end-to-end.

Expect to influence core systems around indeterminism, tool use, and evaluation, working directly with founders who value unconventional technical opinions and fast execution.

Qualifications

• At least one year hands-on experience deploying autonomous agents in production.
• Harness/ orchestration/ memory and eval pipeline experience.
• Strong ML foundations or senior applied AI with full-stack execution.
• Preference for guardrails around model indeterminism.

Responsibilities

• Architect autonomous agent harnesses capable of executing complex workflows inside enterprise environments.
• Design safety guardrails and runtime constraints to manage model indeterminism without reducing utility.
• Build closed-loop evaluation systems that benchmark and improve harness performance.
• Ship agent features directly into production with enterprise design partners.
• Contribute to foundational technical strategy from memory management to multi-agent orchestration.

Skills

Autonomous agents

Harness engineering

Memory systems

Multi-agent orchestration

Full-stack execution

Runtime guardrails

Job description

Dex is building production infrastructure for enterprise AI, focusing on autonomous agents and safe, scalable design. You will join as one of two founding Member of Technical Staff seats in London, owning applied AI and agent architecture end-to-end.

Expect to influence core systems around indeterminism, tool use, and evaluation, working directly with founders who value unconventional technical opinions and fast execution.