GPO-Tech Blog
Fintech
The Ledger: The One Thing You Must Get Right on Day One
How to design a payment ledger for a fintech product — double-entry, immutability, idempotency keys, payment state machines, reconciliation and multi-currency, explained plainly.
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Fintech
What It Costs to Build a Money Transfer App
A realistic 2026 budget for a money transfer app — MVP cost by component, three delivery tiers, the recurring compliance and ops bills founders forget, and what to buy instead of build.
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Fintech
Why Your First Architecture Should Be a Monolith
Monolith vs microservices for a startup: microservices solve organisational problems, not technical ones. Why a modular monolith is the right first architecture.
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