Steve.Architect

Fintech & Ledger Systems

Engineering immutable, double-entry financial ledgers. I build systems that handle money with ACID compliance and 99.8% transaction reliability.

Strategic Approach

Handling money requires zero margin for error. I specialize in building immutable financial ledgers that track every cent. Instead of relying on third-party dashboards, I build internal reconciliation engines that ensure your database always matches the bank.

Capabilities

Double-Entry Ledger Architecture
Idempotent Payment Processing
Stripe / M-Pesa / PayPal Integrations
Automated Reconciliation Logic
Webhook Handling & Failure Recovery
Audit Logging & Financial Reporting

Engineering Process

1

Transaction Modeling

Defining the flow of funds and creating immutable ledger schemas.

2

Gateway Integration

Connecting payment providers with robust error handling and idempotency keys.

3

Reconciliation Engine

Building background jobs that verify internal records against gateway settlements.

4

Security Audit

Ensuring PCI compliance logic (tokenization) and securing financial API endpoints.

Tools & Technologies
Node.jsTypeScriptPostgreSQL (ACID Transactions)Stripe APIM-Pesa APIRedis (Locks)
Why Me?

I don't just 'add Stripe.' I build financial infrastructure. My systems are designed to survive network failures, duplicate webhooks, and concurrency race conditions, ensuring your revenue data is always accurate.

Need this expertise?

Let's discuss how I can architect this solution for you.

Steve Arnold Otieno | Full Stack Engineer