Senior Full Stack Engineer

Full Stack Engineer – Agentic AI-Powered FinTech

Location: London/Hybrid (2 days per week in the office)

Up to £130,000 per annum plus stock options

Typescript | Node | React | Next.js | AWS | GraphQL

Senior Full Stack Engineer - We’re partnering with a well-funded, cutting-edge startup that’s redefining how professionals in the financial services industry interact with artificial intelligence. They’re building intelligent agentic tools that don’t just automate tasks, but collaborate with human analysts to generate insights, drive decisions and transform workflows.

This is a unique opportunity for a Senior Full Stack Engineer who’s eager to work on ambitious, meaningful problems at the intersection of AI, UI/UX innovation, and financial software. You’ll help build a dynamic and responsive tech stack that supports real-time, context-aware interaction between humans and AI agents — a space that's growing fast and ripe for innovation.

What’s the opportunity?

As part of a small, senior-led product and engineering team, the Senior Full Stack Engineer will:

• Architect and implement responsive, AI-enabled interfaces using React, NextJS, and TypeScript
• Develop robust backend services with Node.js, connecting to external financial data and AI tools
• Contribute to database design, DevOps workflows, and end-to-end performance
• Collaborate directly with founders and product stakeholders on feature design, architecture, and UX experimentation
• Explore and implement emerging patterns in AI-powered interfaces and real-time interactions

This Full Stack Engineer role combines technical depth with creative ownership, offering the chance to shape the product and stack from the ground up.

What skills will the Full Stack Engineer have?

They’re searching for a Senior Full Stack Engineer with a breadth of experience:

Core Requirements:

• Demonstrable experience as a Full Stack Engineer with JavaScript / TypeScript
• Strong frontend expertise in React, NextJS, and modern tooling (Tailwind, etc.)
• Solid backend skills with Node.js, Express, RESTful APIs or GraphQL
• Experience building production-grade applications and designing clean data models (SQL/NoSQL)

Bonus Points For:

• Familiarity with AI/LLM tools (LangChain, Vercel AI SDK, OpenAI APIs)
• Experience building real-time apps (e.g., WebSockets)
• Understanding of authentication/authorization flows in web apps
• Knowledge of financial services, fintech, or enterprise-grade products

This is a rare opportunity for a Senior Full Stack Engineer to be part of something early and impactful — helping build the foundational tools for how AI and humans collaborate professionally in high-value industries. Please reply with your CV or call Simon for a chat.

Full Stack Engineer – Agentic AI-Powered FinTech

Location: London/Hybrid (2 days per week in the office)

Up to £130,000 per annum plus stock options

Typescript | Node | React | Next.js | AWS | GraphQL