Senior Software Engineer

Software Engineer Python / FastAPI / React / Functional programming / Typescript

Location: London, UK (Hybrid)

Type: Full-time

Level: Mid to Senior

Salary: 70,000 to 100,000

About the Role:

This startup is building a cutting-edge platform to transform how engineers design physical products. Instead of creating one solution at a time, this system enables users to generate, visualise, and explore thousands of design alternatives. Faster and more intelligently than ever before.

This company is a spin-out from one of the UKs most successful startups, built by top-tier engineers and developers from industry leading teams. Were looking for a software engineer who enjoys writing clean, functional code and is genuinely passionate about real-world engineering not just building software, but helping change how things are designed and built.

Opportunities: Frontend or Backend

Tech Stack within the engineering environment:

• Backend: Python, FastAPI, Pydantic, PostgreSQL, Docker
• Frontend: React, TypeScript, Vite
• Infrastructure: GitHub Actions, GCP, Kubernetes (optional)
• Paradigms: Functional programming, async APIs, event-driven architecture

Responsibilities

• Build and maintain backend services using FastAPI and Python for geometry, simulation, and data workflows
• Develop responsive, performant frontends using React and TypeScript
• Work closely with domain experts (engineers, designers) to translate complex physical problems into usable software features
• Follow functional programming practices to write testable, composable code
• Own features from idea to implementation to deployment
• Contribute to architectural decisions in a fast-moving, early-stage product

Requirements

• Bachelors degree in Computer Science, Engineering, Physics, Mathematics, or a related technical field
• 2+ years of experience building web applications in a production environment
• Strong experience with Python and API frameworks (FastAPI, Flask, etc.)
• Proficiency with React and TypeScript
• Comfort or interest in functional programming principles and clean code architecture
• A genuine interest in engineering and the physical world
• Ability to thrive in a startup or agile environment with autonomy and ownership

Software Engineer Python / FastAPI / React / Functional programming / Typescript