Md Khalid

Backend Developer Authentication

Freelance • Freiberufler

Feb 2025 - Present • 1 yr 8 mos

Premium Authentication API | Advanced Security & Session Management An advanced authentication and account security REST API built with Node.js, Express.js, and MongoDB. Designed for SaaS platforms, business applications, and projects that need more than basic login functionality. Key Features: - Secure user registration and login - JWT access tokens and refresh token rotation - Multi-device session management - View active login sessions and device information - Revoke individual sessions or all other sessions - Email verification and account identity management - Two-factor authentication (2FA) with OTP verification - Recovery codes for account access - Login history and security event tracking - Account protection and login rate limiting - Role-based authorization and permission management - Security audit logs - Secure password hashing and password reset - Joi validation and centralized error handling - Helmet, CORS, and security-focused configuration - Postman collection and setup documentation Technology Stack: Node.js, Express.js, MongoDB, Mongoose, JWT, bcrypt, Joi, and Postman. Built with a modular, maintainable architecture and designed to support stronger account protection, device-level session control, and security monitoring. Includes organized source code, environment configuration, API testing resources, and documentation. Ideal for applications that require advanced authentication workflows and improved visibility into account security. GitHub Portfolio: https://github.com/khalid-webdev

Backend Developer

Self employed / Freelance • Freiberufler

Mar 2024 - Present • 2 yrs 7 mos

Standard JWT Authentication API | Node.js, Express.js & MongoDB A professional and secure REST API authentication system built with Node.js, Express.js, and MongoDB. Designed for websites, SaaS applications, eCommerce platforms, and admin dashboards that require reliable user authentication and management. Key Features: - User registration and login - JWT access token authentication - Secure refresh token rotation and reuse detection - Password hashing with bcrypt - Forgot password and password reset - Change password and logout - Logout from all devices - Role-based access control (User/Admin) - Protected routes and user profile management - Admin user management with activation and deactivation - Pagination, search, and filtering - Joi request validation and centralized error handling - Rate limiting, Helmet, and CORS configuration - MongoDB integration with Mongoose - Postman API collection and setup documentation Technology Stack: Node.js, Express.js, MongoDB, Mongoose, JWT, bcrypt, Joi, and Postman. Built with a modular architecture, reusable middleware, and practical security best practices, this system provides a solid authentication foundation for modern web applications. Includes organized source code, environment configuration, API documentation, and testing resources. GitHub Portfolio: https://github.com/khalid-webdev

Backend Developer

Freelance • Freiberufler

Mar 2024 - Present • 2 yrs 7 mos

Backend Developer specializing in constructing secure, efficient, and scalable server-side systems around precise business logic. I help businesses and independent developers build production-ready Node.js REST APIs and data-driven backends using Express.js and MongoDB. Core Competencies & Functional Implementations: • API Engineering: Designing robust RESTful APIs built with clean MVC (Model-View-Controller) architecture, structured middleware, and comprehensive Express routing. • Database Management: Modeling optimized MongoDB database schemas, handling data persistence, aggregation queries, and ensuring efficient CRUD operations. • User & Access Control: Implementing secure authentication workflows, credential hashing, and secure token-based user management systems (JWT). • End-to-End Solutions: Structuring full-scale backend systems for custom eCommerce platforms, SaaS architectures, and specialized business applications tailored to client requirements. All project architectures, database schemas, and fully commented clean source codes are thoroughly documented and open for evaluation on my GitHub profile. GitHub Portfolio: https://github.com/khalid-webdev