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

New Yesterday

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.
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.
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Location:
City Of London, England, United Kingdom
Job Type:
FullTime

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