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

JR United Kingdom; Ashton-under-Lyne; Remote; GBP 120,000; Full time

Job summary

A leading technology startup is seeking a Senior Full-Stack Engineer with expertise in TypeScript and a passion for AI. This fully remote role is focused on the development of cutting-edge web applications that incorporate advanced AI capabilities. You will collaborate on a unified codebase that supports both SaaS functionalities and AI integrations, delivering user-centric solutions. If you are experienced in Next.js and LLMs, this is an exciting opportunity to contribute to innovative projects in a dynamic environment.

Qualifications

• Experience with integrated codebases in application and AI/LLM environments.
• Proficiency in relevant technologies and frameworks for web and AI.
• Ability to quickly learn and adapt in a fast-paced environment.

Responsibilities

• Design, develop, and maintain web application features.
• Integrate and optimize LLMs through prompt engineering.
• Develop type-safe RPC endpoints for seamless communication.

Skills

TypeScript

React.js

Next.js

tRPC

MySQL

Prisma

LangChain

Job description

Social network you want to login/join with:

Senior Full-Stack Engineer - AI Startup - TypeScript/LLM - £120k - Fully Remote, ashton-under-lyne

col-narrow-left

Client:

Opus Recruitment Solutions

Location:

ashton-under-lyne, United Kingdom

Job Category:

Other

-

EU work permit required:

Yes

col-narrow-right

Job Views:

3

Posted:

10.06.2025

Expiry Date:

25.07.2025

col-wide

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