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efazulkarim/README.md

Kazi Efazul Karim

Senior Full-Stack Product Developer | Lead Software Engineer | SaaS & Mobile App Specialist

💡 About Me

  • 🛠 Senior Full Stack Engineer with 6+ years of experience building SaaS and enterprise applications.
  • 🤖 AI-native dev using Claude Code and modern coding agents to accelerate development while maintaining production quality.
  • 🏗 Passionate about Distributed Systems, Backend Architecture, Message Queues, and Microservices.
  • 📱 Build products across Web, Mobile, and AI using React, React Native(Expo), Django, FastAPI, Node.js, and Go.
  • 🚀 Currently building AI-powered products, developer tools, and open-source infrastructure.

🛠 Tech Stack

💻 Languages

JavaScript TypeScript Python C# Go

🎨 Frontend

React Vue.js React Native Next.js Angular Three.js TailwindCSS Material UI Framer Motion

⚙️ Backend

Node.js Express.js Django FastAPI ASP.NET_Core GraphQL REST_API

🗄 Databases

MySQL PostgreSQL MongoDB SQL_Server ChromaDB

☁️ DevOps & Cloud

Git Docker AWS

Building Now

🔥 Kiln — GTM data enrichment for RevOps teams

Next.js 16 · React 19 · TypeScript · Prisma · Redis · Socket.io

Multi-tenant B2B SaaS that chains 12 enrichment providers into a single waterfall. The differentiator is estimate-before-run: you see projected credit spend and match rate before a job executes, with server-side hard spend caps so a bad run can't drain a budget. Also does AI research agents with schema-validated output, scheduled runs triggered off webhooks and field changes, and native HubSpot / Salesforce sync.

kiln.zelvante.com — 14-day trial, no card.

🩺 Reproductive health companion (in development)

Django · PostgreSQL + pgvector · Expo · RAG

Cycle, fertility, and pregnancy tracking with PCOS-aware predictions and a RAG assistant grounded in WHO/ACOG guidelines. Bangla + English, offline-friendly, doctor-ready PDF exports.


Featured Work

Enterprise Platform Work

Project Stack What it does
🏦 Litigation Management System ASP.NET Core 9, React, PostgreSQL, Redis Bank-wide case platform across ~124 branches. Clean Architecture + CQRS/MediatR + DDD, branch-scoped RBAC over 7 roles, LDAP SSO and TOTP MFA, maker-checker approval workflows, and a Hangfire notification engine firing 5,000+ alerts/day.
🏫 Education Management System React, Express.js, PostgreSQL, Zustand Multi-tenant school platform across 6 schools and 3,000+ users. 250+ documented REST APIs with JWT RBAC, plus exams, fees, payroll, SMS and CMS modules.
📧 Email Validation System Next.js, TypeScript, Tailwind, Python Bulk email verification with an admin dashboard built on Zustand + React Query. Cuts bounce rates for marketing senders.

Products & open source

Project Stack What it does
⚙️ Task Queue Go, Redis Streams, Prometheus Distributed task queue with retries, worker pools, DLQs, idempotency, priority queues and a monitoring dashboard.
🤖 BandUp React Native, Next.js, FastAPI, OpenAI Vocabulary learning app using spaced repetition and LLM-generated mnemonics.
🐍 Django Boilerplate Django, DRF, PostgreSQL, Docker Production-ready starter: Clean Architecture, JWT auth, CI/CD, tests, Docker.

Client work

Production sites shipped for Swiss businesses — construction, medical practice, and hospitality — built on Next.js with multilingual content and SEO as first-class concerns.


Interests

Distributed systems · event-driven architecture · backend performance · AI agents and LLM tooling · developer experience

Open to interesting problems — say hello.

Pinned Loading

  1. django-backend-boilerplate django-backend-boilerplate Public

    Django API Boilerplate

    Python 6 2

  2. forge-task-queue forge-task-queue Public

    Go 2

  3. inp-backend inp-backend Public

    Python 3

  4. AhmadS7/TenantKit AhmadS7/TenantKit Public

    TypeScript 4

  5. insightpilot-frontend insightpilot-frontend Public

    JavaScript 2

  6. GlamAura GlamAura Public

    JavaScript 4 1