Founding AI Platform Engineer

Dex; Greater London; On-site; GBP 150,000 - 190,000; Full time

Job summary

Dex is partnering with a stealth startup delivering legal AI services directly to clients. The role involves architecting the core agentic platform, integrating with Slack, Notion, email and CRMs, and enabling in-house lawyers to review and sign off on automated outputs.

You will hire and mentor engineers, set technical direction, and maintain speed and code quality, while shaping the engineering culture at the fastest pace.

Qualifications

• Staff-level engineering experience in fast-moving startups.
• Experience shipping AI-native or agentic systems in production.
• Ability to deconstruct problems into tight MVPs and make foundational decisions.
• Hands-on coding and willingness to stay technically involved.

Responsibilities

• Architect and build the core agentic platform from scratch with zero legacy code.
• Build deep integrations into Slack, Notion, email and CRMs.
• Design human-in-the-loop interfaces and state machines for rapid review and sign-off by in-house lawyers.
• Partner with paying launch customers and internal legal partners to prioritise automation efforts.
• Establish the engineering culture, hire founding engineers, and maintain high code quality.

Skills

Staff-level engineering

AI-native systems

Hands-on coding

Technical leadership

Hiring / mentoring engineers

Tools

Slack

Notion

CRM integrations

Email platforms

Job description

Dex is partnering with a stealth startup delivering legal AI services directly to clients. The role involves architecting the core agentic platform, integrating with Slack, Notion, email and CRMs, and enabling in-house lawyers to review and sign off on automated outputs.

You will hire and mentor engineers, set technical direction, and maintain speed and code quality, while shaping the engineering culture at the fastest pace.