Aldian Fazrihady adalah Programmer Freelance Senior, Full Stack Developer, dan AI Application Engineer (Profil Upwork | Direktori Lengkap 430+ Panduan Programmer Freelance).
FinTech platforms, B2B marketplaces, neobank layers, and usage-billed SaaS companies that need audit-grade financial accuracy frequently search to hire a freelance double-entry accounting ledger & payment reconciliation programmer. I am Aldian Fazrihady, a Senior Freelance Backend & FinTech Programmer available via Upwork.
Core Double-Entry Ledger & Financial Engineering Capabilities
- Immutable Append-Only Double-Entry Ledgers: Designing PostgreSQL ledger schemas (`journal_entries`, `postings`, `accounts`) where `SUM(debits) = SUM(credits)` is enforced transactionally and balances are never mutated via destructive `UPDATE` statements.
- Automated PSP Settlement Reconciliation: Reconciling Stripe, Adyen, Wise, Xendit, and bank payout CSV/webhook feeds against internal ledger entries to detect fee discrepancies or chargebacks automatically.
- Global Tax & E-Invoicing Integration: Integrating Stripe Tax, Avalara, TaxJar, and regional e-invoicing APIs.
Frequently Asked Questions
How do you prevent race conditions when two concurrent requests withdraw from the same wallet balance?
I use deterministic ordered `SELECT ... FOR UPDATE` account locking or serializable optimistic concurrency checks paired with idempotency keys on every ledger transaction.
How can we hire you for FinTech ledger architecture?
Contact me on Upwork.