Full Stack Engineer

Full Stack Software Engineer – Back Office Ledger/Accounting Software

London – Hybrid, 2 days per week

£110,000–£130,000 + benefits

Certus Recruitment is working with an ambitious UK fintech building a new regulated digital currency and payments platform.

We are looking for a Senior Software Engineer to play a key role in taking the platform from its current stage through to regulated, production-grade deployment.

This is a highly hands‑on engineering role, working across the application and protocol layer and building the services and core engines responsible for issuing, recording, reconciling and settling financial transactions.

The key requirement

We are particularly interested in engineers who have built back‑office ledger or accounting software.

You should have experience developing systems where financial transactions must be recorded accurately, balances must reconcile and there is a clear, auditable record of every movement of money.

Experience could come from payments, banking, fintech, accounting platforms, custody, financial infrastructure or another environment where transactional and accounting correctness is critical.

The role

You will take ownership across areas including:

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

This is very much a build role. You will be taking architecture and design documentation and turning it into robust, auditable production software.

What we're looking for

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, although strong engineers from other systems languages who are keen to learn Rust will be considered

Experience with event‑driven architectures and transactional systems

Strong written communication and a design/documentation‑led approach

Experience within payments, banking, fintech, custody or digital assets would be particularly relevant.

Blockchain or stablecoin experience is not essential, but you should be interested in developing your knowledge of on‑chain systems and comfortable working in a highly regulated financial environment.

The opportunity

This is an opportunity to join at a genuinely formative stage and help build the core financial infrastructure behind a new regulated platform.

Rather than maintaining an established product, you'll be directly involved in building the ledger, settlement and transaction infrastructure that ultimately needs to demonstrate that every movement of money is correct, reconciled and auditable.

£110,000–£130,000 + benefits

Hybrid – 2 days per week in London

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