Senior Full-Stack Engineer - AI Startup - TypeScript/LLM - £120k - Fully Remote

JR United Kingdom; London Fields; Remote; GBP 120,000; Full time

Job summary

A forward-thinking tech company is hiring a Senior Full-Stack Engineer to integrate AI into B2B software solutions. You will develop features using TypeScript and Next.js, contribute to a monorepo, and optimize AI capabilities, while working fully remote in London.

Qualifications

• Demonstrated experience in integrated codebases including application logic and AI components.
• Proficiency in React.js, Next.js, tRPC, TypeScript, and Prisma.
• Strong understanding of MySQL schema design and optimization.

Responsibilities

• Design, develop, and maintain web app features using Next.js and TypeScript.
• Integrate and optimize LLMs through prompt engineering and API orchestration.
• Rapidly adapt to a modern development stack for high-velocity feature delivery.

Skills

TypeScript

React.js

Next.js

tRPC

Prisma

MySQL

LangChain

Job description

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Senior Full-Stack Engineer - AI Startup - TypeScript/LLM - £120k - Fully Remote, london (west end)

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Client:

Opus Recruitment Solutions

Location:

london (west end), United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

3

Posted:

10.06.2025

Expiry Date:

25.07.2025

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Job Description:

I am currently recruiting on behalf of a forward-thinking technology company that is pioneering the integration of AI into B2B software solutions. We are seeking a highly skilled Senior Full-Stack Engineer with a strong foundation in TypeScript and a keen interest in working with Large Language Models (LLMs).

This role offers the opportunity to contribute to a unified codebase that supports both a robust SaaS platform and advanced AI capabilities. You will be involved in the full development lifecycle—from architectural design and database modelling to the integration of LLMs—helping to shape intelligent, user-centric features.

Key Responsibilities

• Design, develop, and maintain web application features using Next.js and TypeScript
• Contribute to a monorepo encompassing both SaaS and AI/LLM components
• Integrate and optimize LLMs (e.g., OpenAI, Gemini) through prompt engineering and API orchestration
• Implement multi-step AI workflows using frameworks such as LangChain
• Design and optimize relational databases, particularly MySQL
• Develop type-safe RPC endpoints using tRPC for seamless frontend-backend communication
• Rapidly adapt to a modern development stack and contribute to high-velocity feature delivery

Required Qualifications

• Demonstrated experience working within integrated codebases that include both application logic and AI/LLM components
• Proficiency in React.js, Next.js, tRPC, TypeScript, and Prisma
• Strong understanding of MySQL, including schema design and performance optimization
• Practical experience integrating with LLMs, including prompt design and API management
• Familiarity with orchestration tools such as LangChain or similar
• Ability to learn quickly and deliver high-quality features in a dynamic, fast-paced environment

Preferred Qualifications

• Experience deploying and fine-tuning custom AI models
• Background in developing B2B software platforms with multi-user functionality

If you are a driven engineer looking to work at the intersection of modern web development and AI innovation, I would be delighted to discuss this opportunity with you further