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Fintech Payment Gateway Modernization & Sub-50ms Processing

How DharmaTech Solutions refactored a legacy payment backend to handle 50,000+ daily transactions with a 99.999% success rate and sub-50ms execution.

6 min technical read Production-Grade Architecture Sub-100ms Latency Standards
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Architecture & Engineering Specifications

Client Challenge

A rapidly expanding payment service provider experienced escalating timeout failures and database deadlocks during peak trading hours on their legacy REST payment API.

Software Engineering Solution

- Re-architected API endpoints using Fastify and connection-pooled PostgreSQL with PgBouncer. - Implemented a Redis-backed idempotency token layer to eliminate duplicate transaction charges. - Introduced dual-write ledger verification ensuring 100% balance reconciliation.

Measurable ROI & Results

  • Latency Reduced: Average API response time dropped from 420ms to 38ms.
  • Failures Eliminated: Zero timeout failures recorded over 6 months of peak volume.
  • Cost Savings: Reduced AWS EC2 compute requirements by 35%.

    • Measurable Outcomes & Deliverables

    Performance Benchmark

    Engineered for sub-100ms API response latencies and 99.99% system availability SLAs.

    Code Ownership

    Complete clean source code transfer with automated CI/CD pipelines and IaC setup.

    Security & Compliance

    SOC2 Type II compliance audit ready, zero-trust OAuth2/JWT auth, and data isolation.

    Ongoing SLA Retainer

    Dedicated principal software engineers maintaining production performance 24/7.

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