Paramjeet Singh

Full Stack Developer with 3+ years shipping production MERN applications across 3 organizations — an IoT-integrated EV rental platform, a multi-OTA hotel booking system, and a GPT-4-powered activity tracker. Strong in Node.js backend development (Express.js, NestJS, TypeScript), REST API design, and third-party/hardware integrations (MQTT, Razorpay, OpenAI GPT-4). Deploys and maintains applications on AWS with Docker and CI/CD pipelines.

Full Stack Developer at Shunya Ekai Technologies (2025-03 – Present)

• Engineered the PlusX Electric EV rental platform end-to-end (MERN, TypeScript) across 4 modules — booking, wallet, vehicle management, and EV charger booking.
• Implemented MQTT-based remote lock/unlock control for EV hardware, Razorpay wallet recharge, and dynamic time-based ride pricing — enabling real-time device commands from the application layer.
• Delivered REST APIs with Express.js/NestJS, validated through manual Postman testing; deployed to AWS via Docker with GitHub Actions CI/CD.
• Led requirement gathering and solution design with project managers; resolved production issues across booking and payment flows.

Full Stack Developer at Twom Global (2023-02 – 2025-02)

• Architected a multi-property Hotel Channel Manager + PMS syncing real-time availability across 2 OTA platforms (MakeMyTrip, Agoda), with isolated booking logic per property and offline/walk-in support.
• Developed 2 concurrency-safe railway allotment systems — a high-traffic Running Room booking flow preventing double-allotment, and a separate Colony Management system for permanent housing.
• Created SadhanaGPT, a GPT-4-powered mentor/student activity tracker with 2 dedicated panels (mentor and student), streak scoring, and weekly activity reporting.
• Delivered REST APIs (Express.js, NestJS, TypeScript) tested via Postman; integrated OTA APIs and webhook-based updates.
• Managed schema design and query optimization across 3 databases (MySQL, PostgreSQL, MongoDB) for multiple concurrent projects; deployed via AWS, Docker, and CI/CD.

Co-Founder & Full Stack Developer at Tripa (Travel & Hospitality Venture) (2019-01 – 2023-12)

• Co-founded and scaled a hotel and homestay business across multiple Uttarakhand locations, combining full-stack development with business growth strategy.
• Established and maintained full-stack systems supporting hotel and homestay operations.
• Operated a B2B tourism product, partnering with Thrillophilia to distribute hospitality inventory.

Bachelor of Technology (B.Tech) in Information Technology – Hemvati Nandan Bahuguna Garhwal University (HNBGU) (2014-01 – 2018-12)