The constraint
Coordinate external providers and on-chain confirmations without double-crediting or losing auditability.
Case study · Fintech · Web3
Multi-chain Payment Engine
A payment orchestration layer spanning fiat providers and blockchain networks, with reconciliation, confirmation tracking, treasury movement, and a complete auditable transaction lifecycle.
request lifecycle
architecture.flowProvider
Webhook API
Queue
Ledger
Settlement
The solution
Used idempotency keys and explicit transaction states around provider callbacks. Asynchronous workers verify confirmations and update the relational ledger before downstream balance or settlement events are released.
architecture highlights
- Saga-style orchestration
- Immutable audit events
- Provider adapters
- Async webhook processing
- Ledger-first settlement
scalability considerations
- Partition listeners by chain
- Deduplicate provider callbacks
- Rate-limit external providers
- Separate hot-wallet and ledger responsibilities
project outcomes
- Multi-provider abstraction
- Multi-network deposit detection
- Confirmation-depth verification
- Auditable transaction lifecycle
runtime.dependencies
Technology stack
Node.jsPostgreSQLRabbitMQWeb3Kubernetes
engineering ownership
My contribution
Built idempotent transaction flows, confirmation-depth checks, webhook verification, and ledger workflows.