Tanjil Hossain

DiveThru is a Canadian mental health therapy matching platform that helps clients connect with suitable therapists and manage their therapy journey across web, mobile, and admin applications. I contribute to the development of the client-facing web app, mobile app, and admin console. My responsibilities include building therapist-matching and rematching workflows, developing scheduling and therapy-session management features, and improving user experience across platforms. I also contribute to scalable application architecture and production-ready features while collaborating with cross-functional remote teams.

Acquire Learning is a cross-platform clinical and educational system built for Web and iPad, serving 500+ active users. I worked as a front-end engineer, architecting the Web and mobile applications and integrating with MongoDB-backed APIs, and implementing real-time WebSocket synchronization on the client side so changes from one user instantly reflect across all active sessions and devices.

One of the most technically challenging aspects was building a multi-container drag-and-drop scheduler with strict collision detection — preventing overlapping time-slot conflicts — along with intelligent insertion logic (dropping on the first half of a slot inserts before, the second half inserts after). I also engineered dynamic manual zoom-in/out for the scheduling viewport, both horizontally and vertically, to support dense, high-interaction workflows, and ensured a consistent UI state when multiple users modified schedules simultaneously.

Cricket Connections is a full-stack session booking platform used by 300+ players and coaches to schedule and manage cricket training sessions. I built back-end services using Node.js, Express, TypeScript, and MongoDB, alongside the React front end, and implemented geo-location-based coach discovery so players could automatically see nearby available coaches.

I integrated the Google Calendar API to sync coach availability with their live Google events in real time, and built complex event-collision detection to prevent double-booked sessions. I also implemented recurring session logic with dynamic availability recalculation and designed an approval workflow that required coaches to confirm bookings before they were finalized. Throughout, I maintained consistent real-time slot updates across the platform after every booking and cancellation.

Elevate is an immersive 3D real estate visualization platform that lets prospective buyers explore property walkthroughs online, showcasing over 40 property units. I built the front end using React, TypeScript, Three.js, and React Three Fiber, creating interactive 3D environments that let users navigate spaces remotely before visiting in person.

I implemented advanced filtering so users could narrow down properties based on criteria relevant to their search, which improved decision-making speed by 20%. A major focus of the project was performance tuning — I worked to keep complex 3D scenes running at stable frame rates across a range of browsers and devices, balancing visual fidelity with rendering performance so walkthroughs stayed smooth even with detailed property models loaded.

MessMate is a cross-platform mobile app (React Native/Expo, TypeScript) that helps shared households and hostels manage daily operations. I designed and built the full system, including meal count tracking with automatic cost splitting, rotating market/duty schedules, shared expense ledgers with per-member balance calculations, stock inventory, and group chat.

The back end is powered by Supabase (Postgres, Auth, Realtime), with state managed via Zustand and UI styled using NativeWind. I implemented role-based access control (owner/manager/member), a fully self-serve onboarding flow, and multi-tenant support so a single account can belong to multiple households.

Key features include real-time chat with attachments, reactions, and read receipts; an automated balance and cost-splitting engine across meals and shared bills; PDF/report generation and export; push notifications; an in-app activity feed; and full audit logging for transparency across household operations.