Senior Fullstack Developer

Version 1 · London, United Kingdom · full-time · On site · January 19, 2026

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Posted January 19, 2026 · Read from Version 1
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Job Description

You will be working in a Scrum Team of cross-functional skills in tight collaboration practising Agile. you'll collaborate closely with Product Owners, Business Analysts, Technical Architects, UX/UI Designers and other team members to understand business requirements and drive the solution design and development of our digital products. You will have strong experience on React with Python and Large Language Models (LLMs) to support and enhance our client’s AI-driven initiatives. Beyond technical expertise, you will follow software engineering best practices, including codebase security, testing, and scalability of AI systems.

This role requires someone who is a self-starter and stays ahead of technology.

Why Version 1?

At Version 1, we believe in providing our employees with a comprehensive benefits package that prioritises their wellbeing, professional growth, and financial stability.

  • Share in our success with our Quarterly Performance-Related Profit Share Scheme, where employees collectively benefit from a share of our company's profits.
  • Strong Career Progression & mentorship coaching through our Strength in Balance & Leadership schemes with a dedicated quarterly Pathways Career Development programme.
  • Flexible/remote working, Version 1 is tremendously understanding of life events and people’s individual circumstances and offer flexibility to help achieve a healthy work life balance.
  • Financial Wellbeing initiatives including; Pension, Private Healthcare Cover, Life Assurance, Financial advice and an Employee Discount scheme.
  • Employee Wellbeing schemes including Gym Discounts, Bike to Work, Fitness classes, Mindfulness Workshops, Employee Assistance Programme and much more. Generous holiday allowance, enhanced maternity/paternity leave, marriage/civil partnership leave and special leave policies.
  • Educational assistance, incentivised certifications, and accreditations, including AWS, Microsoft, Oracle, and Red Hat.
  • Reward schemes including Version 1’s Annual Excellence Awards & ‘Call-Out’ platform.
  • Environment, Social and Community First initiatives allow you to get involved in local fundraising and development opportunities as part of fostering our diversity, inclusion and belonging schemes.

And many more exciting benefits… drop us a note to find out more.

Qualifications

  • Experience of working in a Scrum Team and an Agile environment
  • You will have an extensive background in front-end development with significant experience working with ReactJS. Any further experience with Next.js/Angular/Vue.js is beneficial
  • You will have some exposure to Python, contributing to the design, build, and support of scalable and secure full-stack web applications using FastAPI.
  • Experience in Unit Testing with Jest
  • Experience with GraphQL with React for efficient data fetching and state management is preferred.
  • Consume and integrate RESTful APIs to efficiently connect frontend applications with backend services.
  • Work with business and technical stakeholders to turn requirements into technical solutions.
  • Exposure to integrating AI capabilities into applications using agent frameworks and MCP concepts.
  • Write high-quality code and carry out peer code reviews.
  • Manage code using Git and CI/CD pipelines.
  • Support and mentor team members to follow agreed standards and practices.
  • Financial Services or Capital Markets experience is beneficial.
Employer
Version 1
Location
London, United Kingdom · On site
Contract
full-time