Harjit Singh S.

🏆 Build custom platforms that replace off-the-shelf tools — CRM systems, ERP workflows, e-commerce engines, and subscription billing platforms. SaaS Developer, CRM, ERP & e-Commerce CRM solutions architect | Full Stack Developer | Laravel, Codeigniter, Vue, React, React Native, Node js (Express), Nest Js, Next Js, Nuxt Js, MySQL, PostGreSQL, SupaBase, MongoDB | 7+ Years | 15+ Projects Delivered ✅ Built 15+ full-stack web applications with clean code and on-time delivery ✅ Specialized in project architecture, database/system design and flow of operations ✅ Developed Multi-tenant SaaS platforms, e-commerce stores, admin dashboards ✅ Developed mobile apps (e-commerce, marketing, directory type) for global clients ✅ Implementation of AI based chat bots, training at platform specific data ✅ Payroll management systems with role-based access, approval workflows, and reporting ✅ Customer loyalty and rewards engines with points tracking and segmentation ✅ Admin panels with full audit trails, bulk operations, and CSV/PDF exports ✅ REST API backends for mobile and third-party integrations (UPS, USPS, and more) Before writing a line of code, I document what already exists. I read the current logic first, then make changes incrementally — so nothing breaks unexpectedly and you always know exactly what changed and why. I work cleanly alongside existing teams and lead developers without causing conflicts. Clear communication, no black boxes. Bring expertise across a wide range of technologies, frameworks, and tools to deliver high-quality, efficient, and reliable solutions tailored to your business needs. Available across IST / US timezone overlap. Happy to walk you Technical Skills & Expertise: ✔️ Cloud & Hosting Platforms: Extensive experience in deploying and managing applications across various cloud and hosting environments, including AWS EC2, AWS RDS, DigitalOcean, Vercel, Render, Google Cloud, Microsoft Azure and managed hosting services such as GoDaddy, DreamHost, Namecheap, HostGator, Hostinger, WPEngine, and Wix. ✔️ Frontend & Backend Development: Frontend: HTML5, CSS3, Bootstrap, Tailwind Javascript, jQuery, AJAX, Axios, Vue.js Backend: PHP (CodeIgniter, CakePHP, Laravel), Node.js, Java (Spring Boot) Database Management: MySQL, PostGreSQL, SupaBase & MongoDB CMS & E-commerce: WordPress (custom themes), WooCommerce, Shopify Mobile App Development: Flutter, React Native, iOS (Swift) ✔️ Artificial Intelligence & implementation: AI chatbots, Fine tuning the model with private data. AI architecture: Public platform of Google Gemini APIs and OpenAI AWS bedrock: Amazon provided architecture to fine tune 20+ models (in one go) by private data stored at S3 and embedding and vector storage ✔️ API Development & Integration: Payment Gateways: Stripe, PayPal, Authorize.Net, PayTM Payment subscription: Stripe hosted and api based subscription management, statis/dynamic product/prices on demand, pause/resume/cancel subscriptions & reset billing interval Shipping APIs: UPS, USPS, FedEx, DHL Business Tools: QuickBooks Online, HubSpot, Freshdesk, 3PL Central Cloud Storage: Amazon AWS S3, Google Drive, Dropbox Other Integrations: Google APIs (Analytics & Tag Manager, Ads, Authenticator, Places Predictions, Google Consent Mode), Adobe ESign, Pinterest, Drip API, YouTube API & Ultracart ✔️ Project Management & Automation: Source Code Management: Git (Bitbucket, GitLab, GitHub) Webhooks & Automation: Cron Jobs for automated task scheduling ✔️ Other Libraries, Tools & Functionality: Email: SMTP (AWS SES, Mailchimp, SendInBlue) PDF & Spreadsheet Management: TCPDF, DomPDF, CSV & XLSX support Image Processing: Blueimp file uploads, image cropping, video thumbnail management Data Visualization: Charts (bar, line, pie) for reporting Advanced Table Formatting: Datatables integration WYSIWYG Editors: CKEditor, Summernote, TinyMCE, Froala Affiliate Management: Admin - partner feature by giving appropriate appreciation to respect the visitors redirected from affiliate website Aim to provide 100% client satisfaction with clean code, fast delivery, and solutions that scale with your business. If you're looking for a reliable Full Stack Developer, let's discuss your project and bring your idea to life 🚀 Keywords System/Database Architecture Expert Full Stack Developer Laravel Developer CodeIgniter Developer Vue.js Developer PHP Developer React Developer React Native Developer AI Implementation Developer Node.js Developer MySQL / PostGreSQL / SupaBase / MongoDB Web Application Developer SaaS Developer E-Commerce Developer REST API Developer CodeIgniter Developer Backend Developer Frontend Developer Admin Panel Developer CRM Developer Custom Web Development API Integration Laravel Vue.js PHP Laravel Developer Next Js Developer Docker Based Developement CI/CD pipeline based development