Founding Senior Engineer — Own End-to-End AI Platform

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

Job summary

Dex is partnering to place you in a founding senior engineer role aimed at building a proactive AI assistant from the ground up. You will own desktop, backend, and algorithmic development, working directly with AI researchers in a small, high-caliber team.

This is a rare chance to define your scope, not inherit it, developing a complex system from first principles and shipping robust features in a hands-on environment in London, five days a week.

Qualifications

• A PhD or demonstrable personal ownership of a hard, end-to-end technical project.
• 5+ years building complex, comparable systems, solving genuinely hard problems.
• Strong in TypeScript, Python, Rust, or C++, with a proven ability to quickly master new languages.
• Experience owning the full engineering lifecycle: shipping robust products, working from user requests, and ideally running scientific processes.
• Comfortable with cloud infrastructure, SQL/NoSQL databases, and self-organising in an ambiguous environment.
• Willingness to work in person in London (Elephant and Castle) five days a week.

Responsibilities

• Build and own the desktop application, front and back end.
• Develop core algorithms that bridge the AI model and user actions.
• Design and implement the backend systems for continuous data ingestion and model maintenance.
• Work directly with AI engineers, translating research into robust, shippable product features.
• Drive architectural decisions across the entire stack, from user interface to data persistence.

Skills

TypeScript

Python

Rust

C++

Cloud infrastructure

SQL/NoSQL databases

End-to-end ownership

Education

PhD or demonstrable ownership of a hard, end-to-end technical project

Job description

Dex is partnering to place you in a founding senior engineer role aimed at building a proactive AI assistant from the ground up. You will own desktop, backend, and algorithmic development, working directly with AI researchers in a small, high-caliber team.

This is a rare chance to define your scope, not inherit it, developing a complex system from first principles and shipping robust features in a hands-on environment in London, five days a week.