At a Glance
- Tasks: Design and build core financial systems using Go for an innovative fintech platform.
- Company: Early-stage fintech company focused on secure financial processing and AI capabilities.
- Benefits: Competitive pay for 1-2 days a week, flexible working, and impactful role.
- Other info: Work closely with experts and enjoy significant architectural ownership.
- Why this job: Join a dynamic team to shape the future of finance with cutting-edge technology.
- Qualifications: Experience in backend development, especially in fintech and using Go.
The predicted salary is between 63000 - 77000 £ per year.
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.
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.
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 and open banking integrations
- Build reliable processes for idempotency, reconciliation, audit trails and transaction safety
- Manage low-latency communication between backend services, graph databases and AI components
- Establish engineering patterns for security, automated testing, observability, resilience and maintainability
- Work closely with financial and product specialists to convert complex accounting requirements into clear technical solutions
- Provide senior technical guidance while remaining closely involved in hands-on implementation
You:
- Significant commercial experience developing concurrent, high-throughput backend services using Go
- Strong fintech experience gained within banking, payments, open banking, accounting software or another transaction-intensive environment
- Thorough knowledge of event sourcing, double-entry ledger concepts, idempotency, reconciliation and transaction safety
- Excellent API, database, distributed systems and automated testing fundamentals
- Strong understanding of security, data protection and auditability when handling sensitive financial information
- Comfortable working with ambiguity, taking ownership of architectural decisions and explaining complex technical issues clearly
- Experience with PostgreSQL, Neo4j, GCP, Moneyhub or similar financial data integrations would be advantageous
Benefits:
- Competitive remuneration for a fractional commitment of 1–2 days per week
- Opportunity to build the core financial engine of an innovative early-stage platform
- Flexible working arrangements with London listed as the role location
- A high-impact role combining architectural ownership with hands-on engineering
To submit your CV for this exciting opportunity, please click ‘Apply’ now.
Fractional Fintech Backend Engineer employer: Elliot Marsh
Join an established garden furniture and outdoor living business in Manchester as a Managing Director, where you will have the opportunity to lead a dynamic team and shape the future of an international brand. The company fosters a culture of growth and development, offering ongoing personal and professional training, including executive coaching and leadership development, alongside a competitive salary package with bonuses and private healthcare. With a strong emphasis on international markets and a commitment to employee empowerment, this role provides a unique chance to make a significant impact in a thriving industry.
