May 02, 2026
Contract Full-Stack JavaScript Developer (AI Platform)
📍 Location: 3 days per week in London Office
📆 Duration: 4 weeks with a longer term extension afterwards.
💼 IR35 Status: Outside IR35
💰 Rate: £500p/d – £600p/d
Opus is partnering with a cutting-edge FinTech start-up to secure a Contract Full-Stack JavaScript Developer.
You’ll be joining a small, high-calibre team building a platform to improve workflows within the the FinTech space. They have a genuinely interesting problem at the intersection of frontend engineering, backend systems, and applied LLM tooling.
This is a true 0–1 build, ideal if you enjoy ownership, clean abstractions, and shipping product quickly.
🧠 What You’ll Be Working On
Building and extending agent-driven workflows.
Developing context management and LLM entry points. Only application-layer LLM integrations, not model training)
Expanding slide generation functions and data structures.
Full-stack feature development, with a frontend-heavy bias...
| IR35 Status: |
Outside IR35
|
CV-Library
London, UK
Contractor