Confidential company, Engineering
Full Stack Engineer at high-growth fintech SaaS platform
- Location
- London, United Kingdom
- Compensation
- Not Disclosed
Help redefine the investment management landscape at this high-growth fintech startup in London. We are seeking an elite Full Stack Engineer to build next-generation platforms using Java 21, React, and agentic coding workflows.
This is a high-intensity, high-reward environment for engineers who want to own products end-to-end and work with a team of top-tier talent from global finance and tech giants. Backed by premier venture capital firms, this role offers the chance to integrate cutting-edge AI into production systems at scale. If you are a proactive builder who thrives in fast-paced settings, apply now.
What's the next step?
Confidential company are hiring from Jack's network. Talk to Jack for free and get a direct introduction to the team, if a good fit.
Role overview
Join a high-performance team building a next-generation platform for the global investment industry. You will develop end-to-end features using a modern stack including Java 21 and React. This role involves integrating agentic AI workflows and LLM-powered tools into production services while maintaining high engineering standards within a cloud-native, microservices-driven architecture.
About the company
High-growth fintech SaaS platform
What you will do
- Build and optimize scalable microservices using Java 21 and Spring Boot, defining robust RESTful APIs to support complex financial data flows.
- Develop responsive, high-performance user interfaces using React, TypeScript, and Tailwind CSS, evolving a modern design system for sophisticated financial applications.
- Integrate LLM-powered agents and streaming AI workflows into the platform, leveraging modern cloud infrastructure including AWS, Kubernetes, and Kafka.
Who this is a fit for
- Extensive professional experience in full-stack engineering, ideally within fintech, with mastery of backend Java and modern frontend TypeScript frameworks.
- Proven ability to leverage AI coding tools fluently and a practical understanding of building with LLM APIs, agents, or tool-use flows.
- A proactive, high-ownership mindset that thrives in high-intensity startup environments and prioritizes shipping quality code over following rigid corporate processes.
Why this role is remarkable
- Work at the forefront of AI-driven engineering, utilizing agentic coding tools like Cursor and Claude Code as core parts of your daily development workflow.
- Join a well-funded, early-stage fintech backed by top-tier global venture capital firms and senior industry executives, currently scaling rapidly with significant user traction.
- Own features from conception to production in a high-intensity environment where talent is prioritized over tenure and bureaucracy is eliminated to accelerate progress.
How Jack & Jill work together
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Confidential company wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.