Factual backend API design, secure JWT/OAuth token verification pipelines, real-time webhook endpoints, and custom messaging gateways.
Santosh Gautam architectures secure and high-speed API layers. By writing low-latency routes in Node.js and Slim PHP, designing secure token authentication middleware, validating payloads, and configuring asynchronous webhook listeners for integrations, he provides robust backend connections. These APIs communicate directly with modern frontends built in React.js and Vue.js to deliver responsive, data-driven applications.
In API engineering, security validation is prioritized at every endpoint. Centralized validation layers enforce strict CORS configurations, input sanitization policies, and rate-limiting rules to prevent denial-of-service (DoS) attempts. For user authorization, we implement stateless JSON Web Token (JWT) strategies. Active session payloads are signed using private keys, while refresh token rotations are stored securely in HttpOnly, SameSite cookies to mitigate cross-site scripting (XSS) risks.
Backend services connect to relational SQL engines (MySQL) and document databases (MongoDB). Frequent read requests are cached in an in-memory Redis store to lower queries execution overhead, ensuring APIs maintain high availability under load.
Implementing JSON Web Token (JWT) schemes with refresh token rotations stored in HttpOnly cookies, protecting APIs from session hijacking.
Building secure webhook receivers that validate request origin using cryptographic signatures (HMAC) before passing payloads to background queues.
Integrating external services such as payment platforms (Stripe, PayU) or notification networks (WhatsApp Business API) requires reliable webhook ingestion. To protect backend routes, webhook receivers validate request headers cryptographically using HMAC signatures. Once authenticated, payload files are routed immediately to background message tables, returning a 200 OK response under 50ms and preventing connection timeouts.
Engineered a custom WordPress plugin that hooks into e-commerce checkout updates and triggers asynchronous Meta API payloads to dispatch order templates, complete with input sanitization compliance.
View API Case StudyWe apply strict HTTPS requirements, write validation layers to block injection, setup rate-limiting rules, require cryptographic signatures (HMAC) for webhook verification, and implement stateless token validation (JWT) for user authorization.
We resolve bottlenecks by optimizing database queries (indexing columns, writing efficient lookups), and placing highly-requested read assets into an in-memory Redis cache. This cuts database load and brings request latency below 100ms.
Incoming webhooks are immediately validated cryptographically and dropped into a background message queue (like Redis or a lightweight queue manager). The HTTP handler returns a 200 OK response under 50ms, leaving the queue to process payloads asynchronously without locking connection ports.
Versioning is managed through URL paths (e.g. `/api/v1/`) rather than custom headers, ensuring transparency for client-side routing. Old route modules are maintained as legacy layers and deprecated systematically with deprecation warnings in headers.
