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

Opus Recruitment Solutions; Basildon; Remote; GBP 50,000 - 80,000; Full time

Job summary

A cutting-edge technology company is seeking a Senior Full-Stack Engineer specializing in TypeScript and AI integration. In this role, you will be instrumental in developing a robust SaaS platform while incorporating advanced AI features. The position offers the chance to shape intelligent, user-focused solutions in a thriving environment.

Qualifications

• Experience integrating AI models and LLMs into web applications.
• Strong foundation in TypeScript and web development frameworks.
• Ability to deliver high-quality features in a fast-paced environment.

Responsibilities

• Design and maintain web application features using Next.js and TypeScript.
• Integrate and optimize LLMs through prompt engineering.
• Implement relational databases and type-safe RPC endpoints.

Skills

TypeScript

React.js

Next.js

Prisma

MySQL

Prompt Design

API Management

tRPC

Job description

Senior Full-Stack Engineer (TypeScript & LLM Integration)

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