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

JR United Kingdom; Crawley; Remote; GBP 100,000 - 140,000; Full time

Job summary

A forward-thinking technology company is hiring a Senior Full-Stack Engineer to bridge web development and AI. The role focuses on building robust SaaS solutions while integrating advanced AI capabilities. Candidates should have strong skills in TypeScript and be familiar with LLMs, ensuring innovative user-centric features in a dynamic tech environment.

Qualifications

• Demonstrated experience with integrated codebases including both application logic and AI components.
• Proficiency in TypeScript, React.js, Next.js and MySQL.

Responsibilities

• Design and maintain web application features using Next.js and TypeScript.
• Integrate and optimize LLMs through prompt engineering and API orchestration.
• Implement multi-step AI workflows using frameworks like LangChain.

Skills

TypeScript

React.js

Next.js

tRPC

Prisma

MySQL

LangChain

Job description

Social network you want to login/join with:

Senior Full-Stack Engineer - AI Startup - TypeScript/LLM - £120k - Fully Remote, crawley, west sussex

col-narrow-left

Client:

Opus Recruitment Solutions

Location:

crawley, west sussex, United Kingdom

Job Category:

Other

-

EU work permit required:

Yes

col-narrow-right

Job Views:

5

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