Full Stack Developer & React.js, Vue.js & Node.js

Santosh Gautam specializes in full-stack JavaScript, PHP, and modern web application development. His core technical stack includes Vue.js (Vue 3 Composition API, Pinia, Vite), React.js, Node.js (Express), Slim PHP Framework, MySQL, MongoDB, and Redis caching. He also specializes in Meta WhatsApp Business API integration, Stripe/PayU payment gateways, and AI-powered web tools.

You can hire Santosh Gautam for freelance web development, SaaS product development, or custom API integration. He is available for remote contracts, hourly consulting, or fixed-price milestones for clients in India, Delhi NCR, and globally. Reach out via the contact form or LinkedIn to discuss requirements and receive a free quote within 24 hours.

Unlike the standard WhatsApp Business mobile app, Meta's WhatsApp Cloud API enables programmatic, automated customer notifications, order updates, and two-way chatbots. Santosh builds custom Node.js and PHP webhook handlers with HMAC-SHA256 signature verification, Redis deduplication, and template message dispatching for WooCommerce and custom SaaS applications.

Santosh engineers custom WhatsApp marketing automation systems connecting WooCommerce and CRM platforms with Meta's WhatsApp Cloud API. This enables e-commerce stores to run targeted WhatsApp marketing campaigns, recover abandoned carts with dynamic coupon codes, automate review collections, and leverage direct WhatsApp marketing tools without costly monthly third-party software subscriptions.

Services offered include custom frontend development (Vue 3, React.js, Tailwind CSS), backend REST API architecture (Node.js, Slim PHP), relational/NoSQL database modeling (MySQL, MongoDB, Redis), WooCommerce payment plugins (Stripe, PayU), browser-based WebAssembly tools, and end-to-end cloud server deployments.

PixGrow is a high-performance image optimizer plugin for WordPress built by Santosh that converts images to WebP and AVIF formats directly in the browser using WebAssembly (WASM). As an open-source image optimizer plugin, it reduces image payloads by up to 70% without requiring third-party cloud API keys or consuming server CPU resources.

Yes, Santosh Gautam engineers scalable SaaS platforms. He designs multi-tenant database architectures, automated subscription billing (Stripe, PayU), stateless JWT authentication with refresh token rotation, and high-performance REST APIs tailored for fast user growth.

Yes, Santosh designs and develops AI-enabled web apps. He connects secure backend endpoints to LLMs (such as Anthropic Claude API and OpenAI), implements real-time streaming interfaces in Vue.js and React, and creates intelligent data parsers.

React.js services include building fast Single Page Applications (SPAs), responsive component libraries with Tailwind CSS, global state management (Zustand/Redux), and custom interactive Gutenberg block plugins for WordPress and WooCommerce.

REST APIs are built with Node.js/Express or Slim PHP following industry standards. They feature stateless JWT tokens, strict input sanitization, rate-limiting, CORS whitelisting, Redis caching for sub-100ms response times, and HMAC webhook verification.

Santosh offers flexible engagement models: hourly rates for consulting and code reviews, monthly retainers for ongoing development, and fixed-price contracts for well-defined projects with milestone-based delivery and NDA confidentiality.

Performance is optimized using Vite SSG pre-rendering, route-based code-splitting, lazy loading, lightweight CSS utilities, and local WebP/AVIF asset compression to achieve 95+ Google PageSpeed and Core Web Vitals scores.

Yes, Santosh has extensive experience collaborating asynchronously with international teams and founders across US, European, and Asian time zones using Git, Slack, Jira, and agile sprints.