Fractional Fintech Backend Engineer

Our client has an exciting opportunity for a Fractional Fintech Backend Engineer to join the team. Location: London Salary: Competitive Job Type: Fractional, 1-2 days per week About The Company: Our client is an early-stage financial technology business building an intelligent platform that combines secure financial processing with advanced data and AI capabilities. Accuracy, auditability and transaction integrity sit at the heart of the product. The business is now looking for an experienced backend engineer to help create the core financial engine and establish a robust technical foundation for future development and scale. Fractional Fintech Backend Engineer - The Role: The Fractional Fintech Backend Engineer will design and build the core ledger and financial processing services using Go. The role will involve creating deterministic, event-sourced systems that ensure financial transactions remain balanced, traceable and safe. Working directly with the founder and alongside graph, AI and infrastructure specialists, the successful candidate will translate complex accounting requirements into secure, maintainable software and reliable integrations. Fractional Fintech Backend Engineer - Key Responsibilities: - Design and build an append-only, event-sourced double-entry ledger using Go - Develop strict, type-safe validation logic that ensures financial transactions balance before execution - Create secure, high-performance APIs and microservices for financial data ..... full job details .....