Software Engineer (up to £300k)

Dex; Greater London; On-site; GBP 90,000 - 140,000; Full time

Job summary

Dex is hiring for a senior engineer to join a small, high-caliber team in Hoxton, London. You will own features end-to-end across Rust services, backend and frontend, shipping high-quality code with the help of cutting-edge AI tools.

You will tackle deep technical problems, optimize performance, and contribute to CI and infrastructure improvements. This role requires working 5 days a week in our Hoxton, London office.

Qualifications

• Demonstrated track record as a top-tier engineer.
• Experience using AI for coding, with advanced prompting.
• Familiar with models such as Claude Code and Cursor.
• Experience owning features end-to-end across Rust, TypeScript and frontend/backend.

Responsibilities

• Ship high-quality code quickly using AI tools.
• Own features end-to-end from backend to frontend.
• Optimize performance and reduce allocations.
• Improve AI agent harness, tools and context.
• Drive backend and infrastructure improvements, CI included.

Tools

Rust

TypeScript

React

Job description

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process.

The role

This company is reinventing how businesses make their biggest decisions. They're starting by building the best AI add-in for complex financial modelling in Excel. Financial models underpin every critical business decision, yet the tooling for this form of programming is fundamentally broken. This is a chance to fix it. The long-term vision is an AI operating system for the entire strategic decision lifecycle, a new category with a massive market opportunity. The engineering team is small, but comprises top-tier talent from leading institutions.

You will join a small, high-calibre engineering team. This isn't a role for 'vibe coders'; you'll own features end-to-end, from Rust services to backend and frontend, with a mandate to ship high-quality code at speed using the latest AI tools. Expect deep technical problems, not just feature implementation. This role is 5 days a week in person in Hoxton, London.

The work

• Ship high-quality code at speed, leveraging the latest AI tools and models. This isn't optional.
• Own features end-to-end: from Rust services to backend logic and frontend implementation.
• Optimize for performance: eliminate allocations, tune queries, implement aggressive caching.
• Enhance our AI agent's intelligence by refining its harness, tools, and context optimization.
• Drive improvements across backend and infrastructure, from low-level bug fixes to CI optimization.

What You Bring

• Demonstrable track record as a top-tier engineer.
• Expertise in leveraging AI for coding, including advanced prompting and familiarity with various models (e.g., Claude Code, Cursor).
• Experience owning features end-to-end across the stack (Rust, TypeScript, React, backend, frontend).
• A deep understanding of performance optimization and infrastructure.
• Ability to work 5 days a week in our Hoxton, London office.

As part of the recruitment process at Dex, we process your personal data in accordance with our Privacy Notice for Job Applicants. This notice explains how and why your data is collected and used, and how you can contact us if you have any concerns.