01
Double-entry ledgers
Append-only journals where every transaction balances — debits equal credits — enforced by the database, not by convention.
Principal / Lead
Hire senior fintech and double-entry ledger engineers
Financial systems engineers who build ledgers, payment flows and reconciliation that balance to the cent — with idempotency on every write and an audit trail regulators can follow.
Role profile
What we look for in a Senior Fintech & Payment Systems Architect
Seniority and experience are agreed in the proposal, and you interview every engineer before they start. These are the skills that interview should test.
02
Idempotent execution
Idempotency keys, row locks and retry-safe webhook handling, so a network retry never moves money twice.
03
Security and PCI DSS scope
Tokenized card data, KMS envelope encryption and immutable audit logs, designed to keep your systems out of PCI scope where possible.
Typical work
What a Senior Fintech & Payment Systems Architect typically works on
Examples of the scope this role is hired for. Your statement of work sets the actual deliverables and how they are accepted.
- 01Core ledger services with balances derived from immutable entries
- 02Stripe Billing migrations with multi-currency tax handling
- 03Reconciliation that matches bank feeds against internal ledgers
- 04Payment orchestration that keeps card data out of your systems through tokenization
Stack and tools
What this role works with day to day. Tell us your stack and we’ll say plainly which parts we can staff.
- PostgreSQL
- Kafka
- Go
- Stripe API
- Plaid
- AWS KMS
Technology guides
Related service
Custom software developmentA system built around your workflow, shipped in weekly increments — not a rewrite that lands a year late.
How hiring works
Four steps, agreed in writing before anyone starts
01
Tell us the role
The stack, the seniority you need, the hours you want covered, and any certifications the work requires. We reply within one business day.
02
We propose engineers
A written proposal sets out who we'd put forward, their seniority and experience, the scope, and the terms. If we can't staff the role well, we say so.
03
You interview every engineer
Nobody starts on your codebase until you've interviewed them and agreed. Use the skills on the role page as your interview checklist.
04
Working arrangements go in the SOW
Working-hours overlap is agreed for each engagement and written into the statement of work — the shared window, who shifts hours, and how handoffs work outside it.
QuantmHill provides development teams from India for Indian startups and SMEs. Role profiles describe project capabilities; availability is confirmed for your engagement. Our team works on India Standard Time. Project working hours, availability and handoff responsibilities are agreed before kickoff.
Need specific certifications? Tell us at the start and we'll confirm whether we can staff to that requirement before you sign. There are no recruiting fees.
FAQ
Questions about hiring a Senior Fintech & Payment Systems Architect
Answered the way we would on a call. If yours isn’t here, send it — we reply within one business day.
Row-level locks (SELECT … FOR UPDATE) or optimistic version checks, unique idempotency keys enforced by the database, and serializable transactions where the invariants demand them.
It keeps the full history of every money movement, so any account balance can be rebuilt as of any point in time — which is exactly what auditors and regulators ask for.
Related roles
Similar and adjacent roles
Add a Senior Fintech & Payment Systems Architect to your team
Tell us the stack, the seniority you need and the hours you want covered. We reply within one business day, and you interview every engineer before they start.