Senior Full Stack Engineer

Crooton; Cambridge; Hybrid; GBP 55,000 - 65,000; Full time

Job summary

A cutting-edge AI recruitment firm in the UK is on the lookout for a Senior Full Stack Engineer proficient in React and Python. You will join a small, senior team working on AI-driven recruitment solutions. The role involves end-to-end ownership of full-stack features, designing high-performance UIs, and refining AI integration. Competitive salary of £55k - £65k with a performance-related bonus and a hybrid work model in Peterborough.

Benefits

Performance-related bonus

Hybrid working model

No legacy technical debt

Qualifications

• Deep experience with modern React (Hooks, Composition).
• Comfortable building and maintaining async APIs (FastAPI/Pydantic).
• Enjoys solving ambiguous, real-world problems.

Responsibilities

• Building and shipping full-stack features from AI analysis visualizations.
• Designing complex React components ensuring high performance.
• Refining LLM prompting logic and CV parsing.

Skills

React

Python

TypeScript

FastAPI

Docker

CI/CD

Data-heavy interfaces

Testing with Pytest

Tools

Postgres

Google Vertex AI

Job description

Senior Full Stack Engineer | AI-Recruitment SaaS (React & Python)

Location: Peterborough / Hybrid

Salary: £55,000 – £65,000 + Bonus

Tech: React (TS), Python (FastAPI), Google Vertex AI, Postgres, GCP

Build the Future of AI-Driven Recruitment

Are you a Senior Engineer who thrives on "greenfield" projects? Do you want to work on a platform where AI isn't just a buzzword, but the core engine of the product?

Join Crooton to help us build our AI-powered recruitment intelligence platform. We are solving the biggest headache in high-volume hiring: processing thousands of applications with speed, fairness, and intelligence, as well as saving time and money.

This isn't a legacy rescue mission. You’ll be joining a small, senior team to write modern, well-structured code and shape the technical roadmap of a platform that’s already making an impact.

The Tech Stack

You’ll be working with:

• Frontend: React, TypeScript, Vite, Tailwind CSS, Zustand.
• Backend: Python 3.10+ (FastAPI), Postgres, Redis.
• AI/Infrastructure: Google Vertex AI, GCP (Cloud Run), Docker, CI/CD.

What You’ll Be Doing

• End-to-End Ownership: Building and shipping full-stack features, from AI analysis visualisations (Chart.js) to advanced workflows.
• High-Performance UI: Designing complex React components and ensuring our "Command Centre" remains lightning-fast under heavy data loads (AG Grid).
• AI Integration: Refining LLM prompting logic and CV parsing to improve candidate scoring and bias reduction.
• Scaling Architecture: Extending our FastAPI services with a focus on strong typing, validation, and async performance.

Who You Are

We are looking for a "Product Engineer"—someone who cares as much about the user experience as they do about the underlying architecture.

• Frontend Expert: You have deep experience with modern React (Hooks, Composition) and building data-heavy interfaces.
• Python Pro: You are comfortable building and maintaining async APIs (FastAPI/Pydantic).
• Testing Advocate: You believe in the "Testing Pyramid" (Pytest, Vitest, Cypress).
• Problem Solver: You enjoy solving ambiguous, real-world problems and want meaningful ownership rather than just "clearing tickets."

Why Join crooton?

• No Legacy Drag: Work on a modern stack with no inherited technical debt.
• AI-First Culture: We use AI to accelerate our own development and iteration.
• Senior Collaboration: Work closely with our Leadership Team in an environment that values clean architecture and good engineering judgment.
• Real Impact: As part of a small team, you will see your work used immediately by organisations hiring at scale.
• The Package: £55k–£65k DOE + performance-related bonus and a hybrid working model in Peterborough.

Ready to apply?

If you’re a clear communicator who cares about code quality and security, we want to hear from you.

Apply today with your CV and (optional) GitHub profile.