VeyoApp is a mobile application designed to analyze your speech, evaluate communication patterns, and help you improve your public speaking and everyday conversations. Users can practice different topics, receive structured feedback, and prepare for various real-life scenarios such as interviews, presentations, and casual discussions. The backend is built with NestJS and Prisma, leveraging WebSockets for real-time speech feedback and analysis. The mobile application is developed using React Native with Expo, ensuring smooth cross-platform performance.

Role: Sole full-stack developer responsible for designing and building the mobile app and backend, integrating OpenAI, implementing real-time communication, and adding in-app subscriptions.

Tech: Used NestJS to structure the backend with clear module separation and WebSocket support for real-time communication. Integrated OpenAI APIs for speech analysis and feedback generation. Chose Prisma with PostgreSQL for reliable and type-safe database access. On the frontend, used XState to manage complex async flows and reduce race-condition bugs. Built the mobile app with React Native (Expo) and implemented authentication with Clerk. Added in-app subscriptions with server-side validation and feature access control.

A power bank rental system with a mobile app, admin dashboard, and backend API. Users can browse available power banks, rent them, and track location and battery in real-time. The system handles user payments through a wallet + card system, blocks users who have unpaid debt or empty wallets, and communicates with physical devices via MQTT. Still in development with more event-driven modules being added.

Role: Sole full-stack developer building the complete rental ecosystem from scratch—backend API, device integration, mobile app, admin dashboard, and DevOps infrastructure.

Tech: Used NestJS for the API and PostgreSQL to store user, rental, and payment data. Devices send location/battery updates via MQTT; the backend subscribes and caches them in Redis (1-hour expiry) to avoid hitting the database too much. When a user requests to rent, they choose their payment method (wallet or card), then the API checks device availability with a 10-second timeout before processing that payment. Users can't rent if they have unpaid debt. Built payments, rentals, and device tracking as event-driven services so each module works independently. Mobile app with Expo, admin dashboard with Next.js. Hosting on Render.

Full-stack platform built for a bakery business with three applications: client (Expo), staff (Expo), and admin dashboard (Refine). System handles real-time orders, role-based workflows for bakers/baristas/cashiers, and inventory management. Uses Supabase for authentication and real-time updates, with Redux Toolkit for optimized client-side state management. TanStack Query minimizes redundant API calls. Project development paused due to company-side issues affecting requirements and timeline.

Role: Full-stack developer responsible for architecting and building all three applications (client, staff, admin), Supabase integration, cron job automation, and error monitoring setup.

Tech: Selected Supabase for managed PostgreSQL, real-time subscriptions via WebSockets, and built-in authentication—critical for eliminating backend infrastructure complexity. Used Supabase Realtime to sync orders instantly across staff apps (bakers, baristas, cashiers see orders the moment client places them). Expo for cross-platform staff and client apps. Built Refine admin dashboard for operational oversight and inventory management. Integrated Sentry for crash monitoring and PostHog for behavioral analytics. Cron jobs maintain inventory accuracy by reconciling orders with stock.

Built 3 independent Telegram bots for different operational needs. Delivery Management Bot uses PostgreSQL to manage a hierarchy of organizations, operators, and delivery personnel. Operators invite delivery guys via code, manage assignments, track real-time delivery status, and attach orders with address details clickable in Google Maps. Business Reporting Bot captures operational information (who, what, why). Exam Preparation Bot retrieves and delivers exam questions with answers. Two bots deployed in production, one production-ready but not yet deployed.

Role: Built 3 independent Telegram bots with PostgreSQL backend. Delivery bot includes complete user hierarchy, order management, and real-time notifications. Reporting bot for business operations. Exam bot for education. Two deployed, one production-ready.

Tech: Selected Python for rapid bot development. Delivery bot uses PostgreSQL to maintain organization/operator/delivery-guy hierarchy and order state. Implemented invite code system for secure user onboarding. Integrated Google Maps for address-to-location conversion. Used Telegram Bot API with inline keyboards for intuitive multi-step workflows.

Patty is a mobile-first platform for discovering, creating, and managing local parties in your town. Users can explore public parties, get invited to private gatherings, and host their own events with full control over guest interaction areas. The app combines social features like friend following and achievements with detailed party information including drink types, food availability, guest count, location, and host descriptions. All location-based discovery is limited to your current town, ensuring a localized community experience. The entire backend is built on Firebase with Firestore and security rules, enabling real-time party updates and robust authentication.

Role: Solo developer—designed and built the entire mobile app, Firebase backend architecture, and published to Google Play Store.

Tech: Chose Firebase/Firestore for real-time database and authentication—eliminates backend infrastructure while providing instant party updates when new events are created or guest counts change. Location-based filtering (town-scoped) prevents global clutter and creates intimate community. Expo for rapid cross-platform development and direct Play Store deployment. Firebase security rules enforce privacy—public parties visible to all in town, private parties only to invited users. StyleSheet for performant native styling.

Shoowy is a habit-tracking mobile application focused on cold shower routines. It helps users build consistent habits by guiding transitions between cold and hot water, providing structured routines and progress tracking.

Role: Solo developer—designed and built a focused habit-tracking app with minimal UI/UX, Firebase integration, and user authentication.

Tech: Chose minimal design to reduce distractions during cold showers. Firebase for real-time user progress tracking and cloud backup. Clerk for authentication—simple but secure, perfect for habit app. GlueStackUI components for accessible, consistent UI. AsyncStorage for local caching to support offline habit logging.

Life Counter is a lightweight React Native app that calculates and displays a user's current age down to decimal precision in real time. The app uses local async storage, requires no authentication, and includes widget support for quick access.

Role: Solo developer—built a simple but polished utility app from concept to Play Store deployment.

Tech: Minimalist approach—zero backend, zero auth, pure client-side calculation. AsyncStorage persists birthdate locally. Used React's useEffect with interval to keep age updating in real-time without lag. Exported widget using Expo's widget APIs for home screen quick access.

A clean and modern real estate web application created as a showcase of frontend skills. The project focuses on UI/UX, responsive layouts, and smooth interactions rather than backend complexity.

Role: Solo developer focused on frontend design and implementation. Created designs, component architecture, and responsive layouts.

Tech: Selected Next.js for Server-Side Rendering enabling fast initial page loads and SEO optimization for property listings. Tailwind CSS for rapid, consistent styling without custom CSS. TypeScript for type safety across components. Vercel deployment for automatic optimization and zero-config hosting.