Senior Fullstack Engineer — AI-Driven Finance Platform

Dex; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Dex is seeking a Senior Fullstack Engineer to own major product surfaces end-to-end, transforming ideas from whiteboards to production and measuring real user impact.

You will build user experiences tightly coupled to in-house AI infrastructure, including streaming agent execution, resumable code environments, and multimodal document search. This role requires hands-on ownership from architecture to deployment.

Qualifications

• 4+ years building and shipping production software at a venture-backed startup or top-tier tech company.
• Strong fullstack fluency across Python (FastAPI), TypeScript, React, and PostgreSQL.
• Experience building user-facing products tightly coupled to LLMs and autonomous agents, not just basic APIs.

Responsibilities

• Own core product surfaces across the entire stack, from architecture to post-launch telemetry.
• Build user workflows on top of internal AI infrastructure, including streaming agent execution and resumable code environments.
• Design interfaces that integrate with daily tools used by investment teams, such as spreadsheets, presentations, and email.
• Uphold code quality, performance, and architectural decisions to sustain velocity.

Skills

Ownership

Fullstack fluency

Problem solving

Finance/enterprise domain

Tools

Python (FastAPI)

TypeScript

React

PostgreSQL

Job description

Dex is seeking a Senior Fullstack Engineer to own major product surfaces end-to-end, transforming ideas from whiteboards to production and measuring real user impact.

You will build user experiences tightly coupled to in-house AI infrastructure, including streaming agent execution, resumable code environments, and multimodal document search. This role requires hands-on ownership from architecture to deployment.