Financial Technology Mumbai, India

How Mumbai FinTech PayStream Migrated 400+ Microservices to Edge Workers with BhaiCode

PayStream used BhaiCode's autonomous AST refactoring and test-repair engine to migrate 400+ legacy Node.js microservices to Cloudflare Workers with zero transaction downtime.

4.5x Faster
Migration Speed

Completed 9-month migration roadmap in just 7 weeks

14.2 ms
Global Latency

Reduced p99 checkout latency from 180ms to 14.2ms

-72%
Inference Cost

Reduced AI developer tooling costs with local BYOK routing

PayStream Payments

The Challenge

PayStream processed over 40 million payment events daily across legacy monolithic microservices. The infrastructure suffered from high server maintenance costs and regional cold start latencies. Their 60-engineer team faced a 9-month manual refactoring cycle to rewrite routing layers, database connection pools, and unit tests to Cloudflare Workers.

The Solution with BhaiCode

By adopting the BhaiCode Desktop IDE with Parivaar multi-agent coordination, PayStream automated the conversion of Express.js controllers into typed Hono edge handlers. BhaiCode's autonomous tester agent ran thousands of Jest suites, identified edge-compatibility bottlenecks, and patched AST nodes automatically.

Architecture & Implementation Details

Migration Pipeline

  • Repository AST Scanning: BhaiCode scanned legacy Express route trees and generated Hono edge equivalents.
    • 2. Database Adapter Translation: Converted heavyweight pg connection pools into Hyperdrive and D1 edge pools. 3. Automated MSW Mocking: Rewrote integration test suites to mock downstream banking gateways with MSW. 4. Zero-Downtime Canary Verification: Verified canary builds in ephemeral Cloud Sandboxes before staging deployment.

    Quantifiable Results & Business Impact

    ✓ Successfully migrated 412 microservices to Cloudflare Workers with zero production outages.
    ✓ Achieved 14.2ms global p99 API response time across 12 Indian banking integrations.
    ✓ Freed up 1,400+ engineering hours previously allocated to repetitive boilerplate refactoring.
    “

    BhaiCode's AST refactoring didn't just write code—it understood our transaction validation invariants and generated spotless edge handlers that passed our strict compliance audits on the first run.

    Aditya Deshmukh
    VP of Engineering, PayStream
    PayStream Payments

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