Senior Back-End Ledger Engineer – Fintech Payments

Certus Sales Recruitment; Greater London; Hybrid; GBP 110,000 - 130,000; Full time

Job summary

Certus Recruitment in London is seeking a Senior Full Stack Software Engineer to power back-office ledger and accounting software at a fintech scale. The role involves building the core transaction infrastructure, ensuring auditable records, and integrating traditional financial systems with blockchain settlement.

You will own backend services, double-entry accounting logic, reconciliation, and settlement workflows, while collaborating on APIs and event schemas. Hybrid work model offered.

Qualifications

• 5+ years' professional software engineering experience.
• Proven experience building back-office ledger/accounting software.
• Strong experience with financial transactions, reconciliation and data integrity.
• Experience taking systems from prototype through to production.
• Strong back-end engineering capability.
• Experience with strongly typed languages.
• Strong SQL/PostgreSQL knowledge.
• TypeScript experience.
• Rust experience would be highly valuable, though other systems languages considered.
• Experience with event-driven architectures and transactional systems.
• Strong written communication and a design/documentation-led approach.

Responsibilities

• Back-end services and transaction workflows.
• Double-entry ledger and accounting systems.
• Settlement services and payment orchestration.
• Event-sourced financial records.
• Reconciliation and transactional integrity.
• Compliance and authorisation logic.
• Database design and integrity controls.
• Shared APIs and event schemas.
• Customer-facing and internal applications.
• Integration between traditional financial infrastructure and blockchain settlement.

Skills

Back-end engineering

SQL/PostgreSQL

Event-driven architectures

TypeScript

Rust

Strong typed languages

Documentation & design

Financial data integrity

Job description

Certus Recruitment in London is seeking a Senior Full Stack Software Engineer to power back-office ledger and accounting software at a fintech scale. The role involves building the core transaction infrastructure, ensuring auditable records, and integrating traditional financial systems with blockchain settlement.

You will own backend services, double-entry accounting logic, reconciliation, and settlement workflows, while collaborating on APIs and event schemas. Hybrid work model offered.