Building Production Subscriptions with Razorpay: Webhooks, Signatures, and Edge Cases
A practical engineering guide to handling RBI e-mandates, flipped HMAC signatures, Fastify raw body buffers, and idempotent webhooks in Node.js.
#architecture
Posts tagged #architecture
How to Choose a Database in 2026: Eight Options Compared by Use Case
PostgreSQL, MySQL, SQLite, MongoDB, Redis, Cassandra, DynamoDB and ClickHouse compared by use case, with facts checked as of October 2026.
Architecture Case Study: Migrating a Developer SaaS from Serverless to a $10 VPS with Docker
How we eliminated cold starts, solved database connection pool exhaustion, reduced P99 latency by 92%, and stabilized infrastructure costs using Docker, Caddy, and a $10 VPS.
Stop Logging Out Innocent Users: Building Production Refresh Token Rotation with Token Family Revocation in Redis
How to implement RFC 6749 OAuth 2.0 Security BCP in NestJS and Redis with atomic Lua scripts, concurrency grace windows, and SSR-safe session management.
Hardening the Edge: Defeating SSRF, Redirect Traps, and Compression Bombs in Next.js Dynamic OpenGraph Generators
Why passing user-supplied avatar URLs to @vercel/og creates a critical SSRF vulnerability, and how to build a 5-layer defense in V8 Edge runtimes with magic byte validation and bounded streaming.
Building a Production Remote MCP Server in NestJS: Connecting Claude Desktop and Cursor to Your SaaS
Why local stdio scripts fail in production, and how to build a stateless JSON-RPC 2.0 server over HTTP with bearer authentication, schema validation, and self-healing LLM error handling.
