bash — ~/nafi
$whoami
Full-Stack Web Developer — Python / SQL backends, React & TypeScript frontends.
$cat profile.txt
2 years engineering end-to-end web solutions — from digital storefronts and dynamic
user platforms to mobile-first interfaces. Focused on pairing secure, high-performance
data processing with interactive frontend experiences.
Nafi Khan Chowdhury
Full-Stack Web Developer
~/skills $
ls -l
languages
Python (3y) · SQL (2y) · JavaScript (2y) · TypeScript (1y) · HTML5 · CSS3
frontend
React · Next.js
backend
Node.js · FastAPI · Flask · RESTful APIs
databases
PostgreSQL · SQLite · Relational DB design
tooling
Git/GitHub · Web Scraping · UI/UX Optimization · Mobile-First Design · Automation · Real-Time (SSE/WebSocket)
~/projects $
git log --oneline
#a3f9e21mainFull-Stack Developer
GAME TERMINAL — Digital Storefront Architecture
Next.js · React · Node.js · Stripe · Docker
- Architected a full-stack digital storefront for games and subscriptions — SSR product pages for SEO, containerized Node.js backend for order processing and license delivery.
- Enforced a mobile performance budget: LCP < 2.5s on 3G, CLS < 0.1, with a Lighthouse CI gate blocking regressions before merge.
- Embedded three support channels (Discord, WhatsApp, Messenger) into the UI — shifting 70% of support volume to chat within 60 days.
#7c1b408backendBackend Developer
Real-Time Currency API & Automation Engine
Python · FastAPI · SQLite (WAL) · APScheduler · httpx
- Built an autonomous 4-source scraper with rate limiting, exponential backoff retries, and a 60-minute cron loop — zero manual intervention.
- Designed a normalized SQLite schema (WAL mode) served via FastAPI with Pydantic validation and LRU caching — p99 latency < 50ms.
- Implemented a circuit breaker that skips failing sources for 30 minutes, plus Prometheus metrics and a /healthz endpoint for structured observability.
#e4d0a17frontendFrontend Developer & Tool Maker
Web Platform UI/UX & Custom Tooling
React · CSS Modules · Python · OpenCV · Tesseract
- Led a full frontend migration from jQuery to React + CSS Modules — a WCAG 2.1 AA compliant, mobile-first redesign with a design token system.
- Reduced JS bundle by 38% through code splitting and tree-shaking, with a Lighthouse CI budget enforcing JS < 170KB.
- Built OCR tooling (Sleepy Stitcher, BubbleTagger) that cut the localization team's image processing pipeline by 47%.
#0f88c3dsystemsSystems Developer
arc_engine — Local AI Automation Architecture
Python · llama.cpp · IPEX-LLM · Intel Arc GPU · FastAPI
- Built a local-first automation framework running coding agents entirely on-device via llama.cpp + IPEX-LLM on Intel Arc GPU — zero cloud API dependencies, no rate limits, no data egress.
- Implemented smart model loading: auto-detects VRAM, selects the max context window, and falls back GPU → CPU offload → pure CPU.
- Zero telemetry architecture — no outbound requests except explicit tool calls, with an audit log of SHA-256 hashes for reproducibility.
#b52d6e9visualizationFull-Stack Developer
Live DDoS Attack Map
React · Vite · Three.js (globe.gl) · Node.js · Express · WebSocket · GitHub
- Built an interactive 3D globe visualization rendering simulated DDoS traffic as animated arcs between country centroids, color-coded by attack type.
- Implemented a live metrics panel at 60fps using O(1) incremental counters — exponential moving average, bounded min-heap for top sources, no full re-render per event.
- Designed a dual-mode architecture: fully static in-browser simulation, plus an optional Express + WebSocket backend for real-time event streaming.
#d914aa2researchBackend Developer
Spyder — Zero-AI Research Agent
Python · TF-IDF (from scratch) · asyncio · DuckDuckGo/ArXiv/PubMed/Semantic Scholar/Crossref APIs · GitHub
- Built a keyless, LLM-free research pipeline querying 5 retrieval engines in parallel via asyncio, deduplicating, and producing structured cited reports — no API keys required.
- Implemented TF-IDF entirely from scratch (no sklearn) with k-means thematic clustering — ~50ms for 200 docs / 5000 vocab on laptop CPU.
- Shipped multi-format citation export (BibTeX, APA, MLA, RIS) plus a zero-dependency stdlib web UI — no npm, no build step.
#c9a41f5intelFull-Stack Developer
Seltos — Bangladesh Intelligence Terminal
Node.js · Express · SSE · Three.js (globe.gl) · fastText · MinHash LSH · GitHub
- Built a Bangladesh-focused intelligence platform scraping 9 news sources in parallel via worker threads every 15 minutes — zero cloud dependencies, zero telemetry.
- Implemented Bangla language detection (98% accuracy via fastText lite) plus MinHash LSH online story clustering across sources.
- Shipped a Jarvis-style dashboard: WebGL globe with district choropleth heatmap, inter-district co-mention arcs, and a live SSE feed.
#f21c7b6forkContributor
Kotatsu-0 — Android Manga Reader (Fork)
Kotlin · Android · Jsoup · OkHttp · GitHub Actions · GitHub
- Restored 12+ broken source scrapers across 6 PRs (MangaDex API v3 migration, MangaKakalot, MangaFox, KissManga, ComicWalker).
- Each fix ships with regression test HTML snapshots and a nightly CI validator against live endpoints with Slack alerts.
- Wrote SOURCE_AUTHORING.md and a NewSourceTemplate.kt boilerplate for the modular extractor plugin system.