Senior Full-Stack Engineer (Python + Next.js)

Electric Twin Ltd
London
About Electric Twin

Electric Twin is building the future of strategic decision-making .

We use large language models (LLMs) to simulate human behaviour, creating science-based synthetic populations that mirror real markets and demographics.

Our platform gives leaders in business and government a new way to explore outcomes - from qualitative polling and quantitative analysis to simulated focus groups and one-to-one discussions. The result: faster insight, stronger evidence, and more confident decisions.

With a unique proposition in the rapidly developing generative AI sector, Electric Twin is poised for significant growth. We're backed by world-class leadership, including:
  • Alex Cooper (Co-founder) - Former COO at UNDO, Director of Mass Testing for the UK's Department of Health, and Advisor for 10 Downing Street
  • Ben Warner (Co-founder) - Former Chief Advisor on Digital and Data to the UK Prime Minister, Data Scientist at Faculty, and EPSRC Research Fellow at UCL
We're now looking for a Senior Full-Stack Engineer to help us build the next generation of applied AI tools.
What You'll Do
  • Build and ship production features end-to-end across Python , SQL , and Next.js .
  • Design APIs, data pipelines, and UIs that make complex model outputs intuitive and actionable.
  • Own architecture and design decisions - schemas, modularisation, and system patterns.
  • Refactor and optimise existing systems for performance and maintainability.
  • Improve quality and speed through testing and CI/CD.
  • Work side-by-side with founders and senior engineers - we collaborate on-site four days a week.
Requirements

What We're Looking For
  • 5+ years' experience building production software (exceptional 4+ considered).
  • Strong proficiency in Python and SQL for scalable back-end systems.
  • Skilled with TypeScript , React , and Next.js for high-quality front-end work.
  • Solid testing habits and CI/CD experience.
  • Product-focused mindset and attention to code quality.
  • Comfortable working on-site in a fast-paced, collaborative startup.
Nice to Have
  • Experience with data-heavy or high-throughput systems.
  • Exposure to applied AI or LLM integrations (no model training required).
  • Familiarity with GCP , especially IAM, networking, and security.
Why Electric Twin
  • Impact - Shape both the product and how we build it.
  • Pace - We ship weekly; your work goes live fast.
  • Team - Small, sharp, and experienced.
  • Learning - Work hands-on with cutting-edge AI applications that matter.
Posted 2025-10-15

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