Founding Full-Stack Product Engineer - Fintech Infra

Dex; Greater London; On-site; GBP 75,000 - 110,000; Full time

Job summary

Dex partners with a London-based fintech building an autonomous digital worker that executes across banking rails, FX, liquidity, and reconciliation. You will join as a founding-team Product Engineer working directly with the founders to turn prototypes into production-grade infrastructure.

This is end-to-end full-stack ownership with a direct path to engineering leadership as the team scales, not a narrow seat where you push tickets down an assembly line.

Qualifications

• 3+ years of software engineering experience with backend systems and service-oriented design.
• Fintech, banking infrastructure or payment rails experience is preferred.
• Open Banking familiarity is a strong advantage.

Responsibilities

• Architect and ship core product features across backend and frontend, integrating with banking rails and financial tools.
• Design fault-tolerant, scalable architectures handling real-money movement and multi-currency reconciliation.
• Establish testing, monitoring, and CI/CD foundations for fast, safe production deployments.
• Collaborate with founders, commercial teams, and customers to discover requirements and iterate.
• Help shape engineering culture and onboard future hires, progressing toward an engineering lead role.

Skills

Backend systems

Open Banking familiarity

Fintech experience

Customer-facing mindset

Job description

Dex partners with a London-based fintech building an autonomous digital worker that executes across banking rails, FX, liquidity, and reconciliation. You will join as a founding-team Product Engineer working directly with the founders to turn prototypes into production-grade infrastructure.

This is end-to-end full-stack ownership with a direct path to engineering leadership as the team scales, not a narrow seat where you push tickets down an assembly line.