Twelve
Full Stack Engineer, Senior
TwelveUnited Kingdom17 hours ago
Full-timeRemote FriendlyInformation Technology

Senior Fullstack Engineer (Python) | GenAI-Powered Fintech


We are looking for a Senior Fullstack Engineer whose primary language is Python with a strong GenAI-led engineering approach to join this highly profitable, mid-sized fintech in London that’s experiencing continuous growth.


The successful Snr Fullstack Engineer will join a dynamic team of engineers with an outstanding culture, competitive benefits, and commitment to innovation. They offer a flexible hybrid working model and are deeply focused on leveraging AI to revolutionise their development process.


We're looking for a solid, experienced full-stack practitioner who can make a substantial impact across the platform.


Your Core Expertise:

  • Python (Primary Language) 🐍
  • Solid full-stack development experience.
  • Proven experience in environments where GenAI is utilised in the development workflow


Full Tech Stack:

  • Backend & Data: Python, PostgreSQL, BigQuery, MySQL
  • Frontend: TypeScript, React, styled-components
  • Testing: Jest, React Testing Library, Cypress, pytest
  • Cloud & Infra: AWS, GCP, ECS Fargate, Docker, Terraform, GitHub Actions


This is a unique opportunity for an engineer who understands what best practice looks like when working with AI assistance. While you won't be building the GenAI models themselves, your engineering practice must be GenAI-led. The client is looking for individuals who can demonstrate:

  • Applied GenAI Examples: Concrete examples of how you've used applied GenAI in your product work to achieve better or faster outcomes.
  • Paradigm Shift: A deep understanding of how to manage, edit, and iterate on code that is generated by AI agents.
  • 'Good Looks Like': Insights into which available GenAI tools and workflows yield the best results for robust, maintainable full-stack engineering.


What's on Offer 🎁

  • Highly Competitive Salary and a comprehensive benefits package.
  • Hybrid Working model based in London.
  • A genuinely great culture—collaborative, empowering, and focused on professional growth.
  • The chance to work at a highly profitable, growing bank that is setting the standard for technical excellence.


Apply now to learn more!

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