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

Santosh Gautam specializes in full-stack JavaScript and PHP development. His core technical stack includes Vue.js (Vue 2 & Vue 3 with Composition API), React.js, Node.js, Slim PHP Framework, MySQL, MongoDB, and Redis, along with integrations for payment gateways (Stripe, PayU) and the WhatsApp Business API.

Services offered include custom frontend development (React, Vue 3, Tailwind CSS), backend REST API design and engineering (Node.js, Express, Slim PHP), relational and NoSQL database architecture, custom WooCommerce payment gateways, messaging automation (Twilio and WhatsApp API), and webhook integration.

Yes, Santosh Gautam builds SaaS (Software as a Service) platforms from the ground up. He specializes in designing multi-tenant databases, stripe subscription models, automated user authorization/authentication systems (JWT, OAuth), and modular API layers that scale with user growth.

Yes, Santosh Gautam designs and develops AI-powered web applications. He constructs secure backend API connections to model endpoints (like Anthropic's Claude and OpenAI), builds conversational frontend interfaces, implements custom parser scripts, and orchestrates LLM-assisted workflows.

React.js services include custom single-page applications (SPAs), reactive component libraries, lightweight global state stores (Zustand, Redux Toolkit), and interactive administrator layouts (such as Gutenberg block plugins for WordPress dashboard setups).

REST APIs are built on lightweight Node.js frameworks or Slim PHP. They are secured using stateless JWT authentication with refresh token rotations, input validation libraries, rate-limiting, CORS rules, and secure environment isolation to block security threats.

Depending on scalability needs, both relational (MySQL) and non-relational (MongoDB) databases are engineered. Relational databases are built with normalized tables and key indexes, while caching layers using Redis are integrated to handle highly requested data under 100ms.

Freelance consulting services cover end-to-end web architecture, migration of legacy code bases to Vue 3 or React, subscription payment gateway custom integrations, automation of notification pipelines (like the WhatsApp Business API), and server deployment optimization.

Performance is optimized by writing clean, semantic HTML and vanilla CSS/Tailwind utilities. Using modern bundlers like Vite and frameworks like Vue 3, setups utilize lazy loading, code-splitting, asset compression, and pre-rendering/static site generation (SSG) to hit optimal Google Core Web Vitals.

Santosh has engineered custom WooCommerce payment plugins, integrating national and international processors like Stripe, PayU, and others. These plugins manage secure redirect tokens, handle webhook notifications for status validation, and prevent double-billing.

Yes, Santosh built an asynchronous order notification plugin. It integrates WooCommerce checkout events with Meta's official WhatsApp Business API, automatically dispatching pre-approved templates with secure request signing to ensure high-priority message delivery.

Santosh manages Linux-based cloud environments on Linode, manages preconfigured Bitnami stacks for applications, sets up secure Apache/Nginx reverse proxy configurations, administers domain settings (DNS, SSL certification), and configures cron-job database backups.

Yes, Santosh has years of experience collaborating remotely with international clients, cross-functional teams, and agencies. He is proficient with Git workflows, Slack, Figma, and agile project management tools, ensuring smooth communication across timezones.

Recent projects leverage Vue 3, Vite, Pinia, and Tailwind CSS on the frontend, and Node.js with Redis caching, Slim Framework PHP, and custom React Gutenberg blocks on the backend. This stack is carefully tuned to deliver fast loading times, high Core Web Vitals, and seamless user experiences.