Md. Kawsar Ahmed.

Turborepo + Bun monorepo orchestrating 6 applications and 7 services for multi-tenant ecommerce

• Architected a Turborepo + Bun monorepo with 6 applications; designed a two-system platform separating SaaS Control Plane (tenant lifecycle, auth, billing) from Ecommerce Runtime (multi-tenant storefront).
• Built automated store provisioning pipeline with env config generation, Caddy reverse-proxy management, SSL via ACME/Let's Encrypt, and health checks with real-time status tracking through deployment states.
• Implemented a shared-container Next.js storefront serving all merchants via hostname-based tenant resolution with product catalog, checkout, customer auth, order tracking, and theme customization.
• Integrated payment gateway (idempotent checkout), WhatsApp marketing (Baileys with per-store session isolation), and voice marketing (IVR).
• Built modular REST API (Hono + Bun, DDD) with 35 feature modules; authored 3 production Dockerfiles and Docker Compose orchestrating 7 services with health checks and persistence.
• Managed production deployment via PM2 and GitHub Actions CI/CD.

• Turborepo
• Bun
• Next.js
• Hono
• Caddy
• ACME
• Baileys
• PostgreSQL
• Docker
• PM2
• GitHub Actions

Production-grade POS with zero data loss during network outages and exactly-once order sync

• Architected and developed a production-grade offline-first Point-of-Sale application enabling uninterrupted cashier operations during network outages with zero data loss via IndexedDB local persistence.
• Engineered a dual-database sync pipeline using Dexie.js (client-side write-ahead log) and PostgreSQL (canonical store), with BullMQ + Redis background worker ensuring exactly-once order processing via idempotency-key deduplication (24h TTL + DB constraints).
• Integrated Web Bluetooth API for direct ESC/POS thermal receipt printer communication with automatic GATT discovery and Unicode-to-raster conversion using Canvas 2D API with Floyd-Steinberg dithering for non-Latin scripts (Bengali, Arabic, CJK).
• Implemented PIN-based RBAC authentication (4 roles) with Redis-backed server sessions and 12-hour offline cache; designed a Zustand cart engine with per-line/order discounts, variants, modifiers, and category-level taxes.
• Built admin dashboard with menu/staff CRUD, table management, analytics via Recharts, dynamic CSS theming, and keyboard-driven command palette; deployed via Docker Compose + PM2 with separate web/worker processes.

• Next.js
• Dexie.js
• IndexedDB
• PostgreSQL
• BullMQ
• Redis
• Web Bluetooth
• Canvas 2D
• Zustand
• Recharts
• Docker
• PM2

• Launched the Software Intern Program, coaching 102 students to ship 6 software modules for the campus.
• Hosting twice-weekly "Engineering Adda" tech round-tables (avg 40 attendees), boosting club retention.
• Organized a 24-hour hackathon for 51 teams (196 participants); managed logistics end-to-end, earning a 90% participant NPS.
• Developed the Internal Management System and the mail server for the club.

• Organized a 24-hour hackathon, IUPC, E-football, Typing Contest, and ICT Quiz for 600+ participants.
• Worked closely with faculty to plan and execute the event end-to-end.
• Problem Setter for the hackathon segment; mentored participants throughout.
• Developed strong teamwork skills and an ability to thrive in a fast-paced, dynamic environment.

• Bus Tracker: real-time tracking for 12 buses with live map and ETA for students and admins.
• Treasurer Branch Reconciliation: automated matching of bank statements and student payments with instant mismatch alerts and ready-to-sign reports.
• Alumni Portal: a secure platform for graduate profiles, updates, and networking to enhance alumni engagement.
• MCP Server: central info agent aggregating live academic, finance, and transport data for quicker decision-making.