A seasoned Full Stack Developer with 8 years of experience in web & mobile application development.

projects

Priyangsu Banerjee • Peerlist

<h3>DealDesk - Modern Invoicing &amp; DSC-enabled Digital Signing</h3><ul><li>Streamlined Workflows: Automate your invoicing process with a modern, web-based platform.</li><li>Secure Digital Signatures (DSC): Integrate seamlessly with USB tokens like PROXKey and eMudhra for secure PDF signing.</li><li>Enhanced Compliance: Ensure your invoices meet regulatory requirements with built-in compliance features.</li><li>Enterprise-Ready: Designed for businesses of all sizes, offering robust features for managing invoices and digital signatures.</li><li>User Authentication: Secure sign-in process to protect sensitive business data.</li><li>Audit-Ready Invoices: Generate invoices that are compliant and easily auditable.</li></ul>DealDesk provides an end-to-end solution for invoicing and digital document signing, leveraging the power of DSC technology. Our platform is built to simplify your business operations, enhance security, and ensure compliance. Schedule a demo today to see how DealDesk can transform your invoicing and signing processes.

DealDesk - DSC-enabled invoicing app

Control Your Presentations Like Never Before: Turn your smartphone into a powerful remote control for your presentations.<ul><li>Wireless Control: Navigate your slides without touching your laptop.</li><li>Cross-Platform: Works on Windows and macOS with minimal setup.</li><li>Lightweight: No heavy installations, runs in seconds.</li><li>Free &amp; Open: Built for students, educators, and professionals.</li></ul>This innovative tool enhances your presentation experience by providing seamless control from any device. Designed for professionals and educators, it offers a simple and reliable solution to manage your presentations effortlessly. Whether you are using Windows or macOS, this tool ensures a smooth setup and operation, making it an essential addition to your productivity toolkit.

PPT Control | Remote for Presentations

<h3>SniffTag: Reunite Faster, Feel Safer</h3>A quick scan of the QR tag shows the pet’s details, medical alerts &amp; owner contact — no batteries, no subscriptions, no fuss.Built with one purpose: no lost pet should stay lost for long.And for pet brands &amp; shelters, SniffTag offers a white-label solution to make pet safety part of your products.🔗 <a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="http://www.snifftag.in">www.snifftag.in</a>

SniffTag

GitRoast is a playful AI-powered web app that analyzes your GitHub profile and generates a roast based on your repos, commits, stars, and contributions.Powered by Gemini and built with Next.js, it blends developer stats with punchy, stand-up-style burns that are sharp, funny, and sometimes painfully true.Just enter your GitHub username and let our PG-13 roast bot tell you how your open-source life really looks.Great for laughs, shareable moments, and realizing you haven’t pushed in 8 months.

GitRoast

CoinKaro is a browser-based customer loyalty platform designed to help local businesses reward their shoppers using digital coins. With a simple phone number-based flow, CoinKaro enables stores to instantly issue rewards, apply redemptions, and even process refunds as store credits — all without needing billing software or hardware integrations.I conceptualized, designed, and built CoinKaro as a standalone loyalty system that runs on any device and scales with ease. It includes:<ul><li>A mobile-friendly merchant dashboard</li><li>A consumer portal to track coins and redeem rewards</li><li>Real-time reward logic and analytics</li><li>PWA support and multi-store readiness</li></ul>Currently live in two outlets as part of a pilot, CoinKaro has processed over 21,800+ coins with a 13% redemption rate in its first week — showing great promise in driving repeat visits and customer satisfaction.Explore: 🔗 <a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="https://coinkaro.in">https://coinkaro.in</a> 🔗 <a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="https://business.coinkaro.in">https://business.coinkaro.in</a>

CoinKaro – A Lightweight Loyalty Platform for Local Retail

Nukkad Pay is a minimal web utility that helps small vendors and shopkeepers generate UPI payment links and QR codes with a fixed amount. The tool collects the payer’s name, UPI ID, and amount, stores it securely for 30 minutes, and auto-generates a short-lived, shareable payment page.We don’t process any transactions — instead, customers are redirected to UPI apps (like GPay, PhonePe, Paytm) with all fields pre-filled, reducing the chance of errors or price negotiations. Built with a focus on speed, simplicity, and privacy, Nukkad Pay is ideal for quick, in-person payments without needing an app or login.<ul><li>🔒 End-to-end encrypted</li><li>⏳ Auto-expiring links</li><li>⚡ No registration required</li></ul>

Nukkad Pay

GeoTagger is a browser-based photo capture tool that embeds geolocation (latitude &amp; longitude) and the public IP address directly onto photos taken with a device's camera. Designed for field verification, reporting, and digital evidence collection, GeoTagger operates entirely in-browser with no server-side processing.<h3>🚀 Key Features</h3><ul><li>📷 Capture images directly from the device camera</li><li>🌐 Automatically fetch and embed GPS coordinates and public IP</li><li>🖼️ Overlay metadata on the captured photo</li><li>💾 Download stamped photo instantly</li><li>🔐 No data is uploaded or stored — fully privacy-respecting</li></ul><h3>📦 Tech Stack</h3><ul><li>HTML, CSS, JavaScript (Vanilla)</li><li>Browser APIs: getUserMedia, Geolocation, and Fetch</li><li>External IP API: <a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="http://ipify.org">ipify.org</a> for public IP detection</li><li>Canvas API for photo rendering and metadata stamping</li></ul><h3>✅ Use Cases</h3><ul><li>Field inspections and audits</li><li>Journalistic or legal evidence capture</li><li>Wildlife tracking or rescue documentation</li><li>Geo-verification for remote teams</li></ul>

GeoTagger

Tired of saving a number just to send a quick WhatsApp message? WapDialer is here to make your life easier. It's a lightweight, no-install progressive web app that lets you start a WhatsApp chat with any number instantly — without cluttering your contacts. Whether you're messaging a delivery agent, a client, or a one-time contact, simply type the number, hit "Chat," and you're redirected straight to WhatsApp. No logins, no ads, no nonsense — just pure convenience. Works seamlessly on both mobile and desktop. Bookmark it, pin it to your home screen, and chat smarter.

WapDialer – Chat on WhatsApp Without Saving Numbers

SpeakerSync is a powerful, web-based audio routing and amplification tool that transforms your computer into a fully configurable, real-time audio hub. Designed to work seamlessly with Bluetooth, RF, or wired earphones, SpeakerSync allows you to use them as dynamic wireless microphones — no specialized hardware required.Whether you're hosting a virtual meeting, live streaming an event, conducting a family celebration, or simply improving your at-home audio setup, SpeakerSync delivers crystal-clear, low-latency audio output to any connected speakers or audio devices. With a modern interface and intelligent audio processing, SpeakerSync gives you professional-grade control over how sound is captured and transmitted.You can easily select and switch between different input (microphones) and output (speakers/headphones) devices through the built-in source and destination picker. Fine-tune audio levels with separate input and output gain controls, and enjoy a refined listening experience thanks to advanced features like echo cancellation, background noise suppression, automatic gain adjustment, and latency optimization.All of this happens directly within your browser — no need to install bulky software or deal with complex configurations. Just open SpeakerSync on a supported browser (Chrome, Firefox, Safari, or Edge), connect your preferred earphones or mics, choose your destination, and you’re ready to broadcast high-quality audio in real time.Whether you're a content creator, remote worker, public speaker, or just someone looking for better audio control, SpeakerSync gives you the flexibility and clarity you need — right from your browser.

SpeakerSync — Turn Your Earphones into Wireless Mics

Welcome aboard Peer's, a unique, airport-themed portfolio that offers an immersive experience into my world as a full-stack developer. Inspired by the dynamic environment of airports, each section of the website is designed to resemble different parts of a terminal—guiding visitors through my professional journey as if they were passengers on a flight.​From the "Approaching Runway 08" welcome message to sections like "Work," "Process," and "Make it happen," the site employs aviation-inspired terminology and design elements to create an engaging narrative. The interactive interface allows visitors to explore my skills in web design and development, UX/UI, backend, and frontend development. Built with modern web technologies, the site ensures a responsive and seamless user experience across devices. The thematic consistency not only reflects my technical proficiency but also my creative approach to storytelling and user engagement.​Whether you're here for a brief layover or an extended stay, I invite you to explore my portfolio and discover how I can help bring your digital ideas to life.

An Airport-Themed Developer Portfolio

The Perceptron Simulator is an interactive, user-friendly tool designed to help students, researchers, and machine learning enthusiasts visualize and experiment with the perceptron learning algorithm. As one of the foundational algorithms in machine learning, the perceptron serves as the building block for more complex neural network models. This simulator allows users to understand how the perceptron model works, its decision-making process, and how it adapts to training data over time.The tool provides an intuitive interface where users can set up a two-dimensional feature space, visualize data points, and manually adjust the weights and bias of the perceptron. By using real-time visualizations, users can watch the perceptron "learn" from labeled data points (classified into two categories) as it iteratively updates its weights during the training process. The visual feedback helps users understand how the perceptron finds the optimal decision boundary that separates the two classes.Key features of the Perceptron Simulator include:<ul><li>Interactive Visualization: See the perceptron's decision boundary evolve as the model trains on input data.</li><li>Customizable Dataset: Users can import or generate datasets with various patterns to explore how the perceptron reacts to different kinds of data distributions.</li><li>Step-by-Step Learning Process: Watch the perceptron learn over multiple iterations as it adjusts its weights and bias to minimize classification errors.</li><li>Performance Metrics: Track the accuracy and loss of the perceptron model during training to assess its learning progress.</li><li>Real-Time Feedback: Receive immediate visual feedback on the effect of each change, providing an engaging learning experience.</li></ul>The simulator is designed to run in a web browser, making it accessible and easy to use without the need for complex setups. Users can experiment with different configurations, such as adjusting the learning rate, number of epochs, and the types of training data, to see how these parameters affect the learning process.Whether you're a beginner just starting to learn about machine learning or an expert wanting to demonstrate the workings of a perceptron, this simulator provides a hands-on way to understand the fundamentals of supervised learning. By allowing users to control key parameters and visualize their effects, the Perceptron Simulator fosters a deeper understanding of the algorithm's mechanics and its applications in solving classification problems.This tool is ideal for educators looking to teach machine learning concepts in a more interactive and engaging way. It provides a valuable resource for anyone wanting to explore the basics of neural networks and the perceptron algorithm before diving into more complex topics like multi-layer perceptrons and deep learning.

Perceptron Simulator

Phyr Switch is a next-generation smart home control system that empowers users to manage their home appliances from anywhere in the world, using a simple, reliable, and secure interface. Whether you’re at home, at work, or traveling the globe, Phyr Switch provides real-time control over your devices, from lights and thermostats to more complex electronics. The system leverages the MQTT protocol, a lightweight and efficient messaging protocol, ensuring seamless communication between devices even in low-bandwidth environments.One of the standout features of Phyr Switch is its robust failsafe technology, designed to maintain device control even in the event of network interruptions. Whether it’s a brief internet outage or a device failure, Phyr Switch guarantees that users retain access to their home’s smart devices, providing peace of mind and reliability. This failsafe mechanism ensures that your home stays in control, no matter where you are or what happens with the network connection.Phyr Switch is designed to work with a wide variety of smart home devices, making it incredibly versatile. From controlling smart lights, fans, and thermostats, to managing security cameras and locks, the system integrates with multiple IoT ecosystems. It is fully compatible with Alexa, Google Assistant, and other major home automation platforms, making it a perfect solution for both new installations and retrofitting existing setups. The user-friendly mobile app or web dashboard allows you to monitor and control your devices with a few taps or clicks, giving you full control over your environment, no matter where you are.The architecture of Phyr Switch is built with security and scalability in mind. The MQTT protocol ensures that data is transmitted securely between the devices and the cloud, while also minimizing latency for faster response times. With built-in encryption and authentication protocols, Phyr Switch ensures that only authorized users can control the devices, keeping your home secure. Furthermore, the system is designed to scale, allowing users to add as many devices as needed, without compromising on performance.Whether you're managing a single home or multiple properties, Phyr Switch offers seamless device management, with all devices accessible from a unified platform. With its easy-to-use interface, advanced failsafe capabilities, and robust security, Phyr Switch offers unparalleled control and reliability for any smart home enthusiast.