Fullstack Engineer

Company: Oscar
Apply for the Fullstack Engineer
Location: London
Job Description:

Overview

In this role, you design and build the product end-to-end, from database to UI, for an AI-driven platform serving investment teams. You work in a small, senior London team with direct leadership access to deliver secure, multi-tenant features and trusted AI-enabled capabilities. You’ll shape data-heavy interfaces, REST APIs and real-time interactions, while ensuring auditability and compliance. This is a hands-on, impact-focused opportunity to influence product direction in a regulated financial context.

Pay / Benefits

  • competitive compensation
  • close collaboration with leadership
  • impactful work for leading financial services firms
  • collaborative culture
  • central London office

Responsibilities

  • Build data-heavy interfaces in TypeScript and React with role-based access
  • Design services and REST APIs in Python (FastAPI/Django) with OpenAPI contracts
  • Model data in PostgreSQL including multi-tenant isolation
  • Develop event-driven and real-time features via WebSockets
  • Implement SSO, OTP, session/JWT auth; integrate with Microsoft 365 and CRMs
  • Collaborate with AI/ML team to ship LLM-powered features with provenance and approval flows
  • Operate on AWS with CI/CD, observability, and SOC 2 / UK GDPR awareness

Key requirements

  • 5+ years of software engineering with full-stack ownership
  • Strong TypeScript, React, Python and PostgreSQL
  • Auth and access control experience in multi-tenant B2B products
  • AWS, CI/CD and containers
  • Track record of setting technical direction and leading architecture decisions
  • Daily use of AI coding tools and a thoughtful view on their value
  • strong ownership and leadership
  • cross-functional collaboration
  • analytical thinking
  • TypeScript
  • React
  • Python

…

Posted: October 17th, 2026