Tanzim Hossain
Backend Engineer · focused on multi-tenant systems & clean architecture.
/ Professional Summary
Backend Engineer focused on multi-tenant SaaS systems using TypeScript (Node.js) and Java (Spring Boot). I care about clean data models, concurrency-safe booking/scheduling logic, and REST API design that holds up in production.
/ Experience
Backend Engineer & Mentor · Softsasi
- Designed backend services, API contracts, and PostgreSQL data models
- Built modular REST APIs with clear domain boundaries
- Contributed to architecture reviews and design decisions
- Mentored developers through code reviews and engineering guidance
/ Selected Projects
Salon Management SaaS · Multi-tenant SaaS Platform
Multi-tenant salon booking platform, built solo end-to-end. 27 domain modules across 110+ tables. Booking writes are protected by a pessimistic row lock plus a partial unique index as a hard backstop; a separate Redis mutex guards the temporary slot-hold cache. Caught and fixed a real production billing bug where two disconnected settings quietly disagreed on the platform's cut of every booking. Live at donebyme.dk.
FileTree Pro · VS Code Extension
VS Code extension to preview and generate project folder trees before files hit disk. 36,000+ installs on the Marketplace, 5.0 average rating. Conflict-aware by design — existing files are never silently overwritten.
NextRush · Backend Framework
A TypeScript backend framework monorepo — 20+ packages covering a segment-trie router, a tsyringe-wrapped DI layer, Koa-style middleware, and Node/Bun/Deno/Edge adapters. Benchmarked with autocannon against Fastify, Express, Koa, and Hono: 14% overhead vs raw Node.js, and it wins the middleware-stack scenario outright (32,220 RPS vs Fastify's 28,744).
/ Technical Skills
- Architecture
- Multi-Tenant Architecture · Clean Architecture · Framework Design
- System Design
- Caching · Concurrency Control
- Backend
- Node.js · NestJS · Spring Boot
- Database
- PostgreSQL · Redis · MongoDB
- Languages
- TypeScript · Java · Go
- Infrastructure
- AWS · Docker
- AI
- LLM Integration · LangChain
/ Achievements
- 20251st Runner Up
NASA International Space Apps 2025 — Climaxplore (Team Softsasi)
1st Runner-up, NASA Space Apps Challenge 2025 (Mymensingh) — architecture support for Climaxplore, an AI weather-risk platform.
- 2025Built-in AI Challenge
Google Chrome Built-in AI Challenge 2025 — ContentChat AI
Built ContentChat AI using on-device Gemini Nano — Chrome Built-in AI Challenge 2025.
/ Education
BSc in Computer Science
United International University (UIU)