Senior Full-Stack Engineer - AI Startup - TypeScript/LLM

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