# Tanzim Hossain

**Backend Engineer** — System Design & Scalable Backend Systems

tanzimhossain2@gmail.com  
+88 01838647383  
Dhaka, Bangladesh  
https://github.com/0xtanzim  
https://linkedin.com/in/0xtanzim

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## Summary

I'm a CS undergrad at United International University who enjoys the unglamorous parts of backend engineering — clean boundaries, predictable data flows, and code my future self can still understand. I spend most of my time on multi-tenant SaaS design, concurrency, and small but pragmatic framework experiments. Outside of that, I mentor students at Softsasi and write about what I'm learning.

## Experience

### Backend Engineer & Mentor — Softsasi
_Dec 2025 — Present · Full-time · Remote_

- Designed and developed scalable backend systems
- Implemented clean architecture and modular service layers
- Led code reviews and architectural decisions
- Mentored interns on production-level engineering practices

### Mentor — Softsasi
_Jun 2025 — Dec 2025 · Part-time · Remote_

- Mentored developers on backend architecture and frontend structure
- Guided real-world project development
- Improved debugging and system-thinking skills of students

## Selected Projects

### Salon Management SaaS — Multi-tenant SaaS Platform
_2025 · Completed_

Full product for salon businesses — I built the Next.js frontend, NestJS backend, and deployment stack solo. Live at donebyme.dk: booking, scheduling, and subscriptions on a multi-tenant foundation.

**Tech:** TypeScript, Next.js 16, NestJS, PostgreSQL 15, Drizzle ORM, Redis, RabbitMQ, BullMQ, Stripe Connect, Capacitor, AWS EC2, Nginx, pnpm Turborepo

### FileTree Pro — VS Code Extension
_2025 · Active_

VS Code extension to generate and preview project folder trees before files hit disk — small surface area, 29k+ downloads, steady adoption.

**Tech:** TypeScript, VS Code API, Webview UI

### NextRush — Backend Framework
_2025 · In Progress_

A learning-driven Node.js framework — middleware pipeline, trie-based router, plugin system, and zero-dependency core. Built to understand how frameworks actually work.

**Tech:** Node.js, TypeScript

## Technical Skills

- **Languages:** TypeScript, Java, Go, Python, C++
- **Backend:** Node.js, NestJS, Spring Boot
- **Frontend:** React, Next.js
- **Database:** PostgreSQL, MongoDB, Redis
- **Infrastructure:** AWS EC2, AWS RDS, AWS S3, Load Balancer, Docker, RabbitMQ
- **Architecture:** Multi-tenant Architecture, Clean Architecture, Service-Repository Pattern, RBAC, OOP, Framework Design
- **System Design:** Rate Limiting, Caching Strategy, Background Jobs / Queues, Event-driven Patterns, Concurrency Control
- **AI:** LLMs, LangChain, Agent Systems

## Achievements

### NASA International Space Apps 2025 — Climaxplore (Team Softsasi)
_2025 · 1st Runner Up_

1st runner up (Mymensingh site) at the 2025 NASA International Space Apps Challenge with Team Softsasi on Climaxplore — an AI weather risk platform. My focus: architecture support, technical review, and keeping the system design coherent through the sprint.

### Google Chrome Built-in AI Challenge 2025 — ContentChat AI
_2025 · Built-in AI Challenge_

Shipped ContentChat AI: a Manifest V3 Chrome extension that uses on-device Gemini Nano (Summarizer, Prompt, Writer, Rewriter, Proofreader) — no API keys, privacy-first, built for the official 2025 challenge.

## Education

- **BSc in Computer Science** — United International University (UIU) _(Ongoing)_

## Writing

Articles on backend systems, architecture, and developer experience — [@0xtanzim on Medium](https://medium.com/@0xtanzim).

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_Last updated June 2026. References available on request._