Behzad Najafzadeh

Full‑Stack Engineer · Django · Android · KMP

📧 BehzadNjf22@gmail.com

📞 +98 937 422 6136

🐙 github.com/behzad-njf

Summary

Full‑stack engineer with 8+ years building scalable web and mobile products. Many years shipping production Android apps in Java and Kotlin (Jetpack Compose, Room, Hilt). Last 2+ years building cross‑platform mobile with Kotlin Multiplatform (KMP) for Android and iOS, sharing core logic with native UX on each platform. Strong Django backend and React/Next.js frontend experience. Creator of open‑source AI analytics tools with a focus on clean architecture, security, and maintainable delivery.

Technical Skills

Languages

  • Python, JavaScript (ES6+)
  • Kotlin, Java, SQL, PHP

Backend & APIs

  • Django, Node.js, Celery, FastAPI
  • RESTful APIs, GraphQL, Socket.IO
Django

Mobile & Cross-Platform

  • Android — Java & Kotlin (many years)
  • Kotlin Multiplatform (KMP) — Android & iOS (2+ years)
  • Jetpack Compose, Room, Hilt, MVVM
Android Kotlin KMP

Frontend & Web

  • React, Next.js (SSR/SEO)
  • JavaScript (ES6+), responsive UI

AI & Data

  • LLM APIs, RAG, NL→SQL pipelines
  • sqlglot, Pydantic, schema intelligence

Databases

  • PostgreSQL, MSSQL, Redis, Room, MySQL

Tools & DevOps

  • Docker, Kubernetes, Git, Firebase
  • Jenkins, Ansible, Jira, Stripe, CI/CD

Open Source & Projects

DeviceFlow

2026 – Present
Open Source Django · Kotlin

github.com/behzad-njf/DeviceFlow · smsgateway.behzaaad.ir · Django · React · Kotlin

Self‑hosted Android SMS gateway and device automation platform. Pair real phones with a Django API and React dashboard to send OTP, transactional SMS, and USSD on SIMs you control.

  • Multi‑tenant control plane: device pairing, heartbeats, project API keys, webhooks, and live fleet monitoring over WebSockets.
  • Kotlin Android agent for SMS send/receive, dual‑SIM routing, USSD, remote commands, and agent security (hidden launcher, passcode).
  • Ops stack with Redis/Celery queues, contacts/inbox, automations, and Docker Compose deploy.

InsightAI

2025 – Present
AI / NL→SQL Open Source

github.com/behzad-njf/InsightAI · Python · FastAPI · SQLAlchemy

Production platform that turns natural language into safe, read‑only SQL, runs queries on operational databases, and returns grounded answers from real row data.

  • Hexagonal architecture with domain ports, use cases, and FastAPI /api/v1 adapters.
  • Hybrid routing (SQL, RAG over knowledge base, or both) with SSE streaming, sessions, and rate limits.
  • Multi‑layer SQL safety via sqlglot AST validation, read‑only execution, row caps, and timeouts.
  • Trusted semantic metrics, YAML governance (row scope, column masks), and explainability payloads.
  • Integrates django‑db‑schema‑doc exports for schema‑aware LLM context.

django‑db‑schema‑doc

2025 – Present
PyPI Django

pypi.org/project/django-db-schema-doc

Schema intelligence for Django: Markdown docs, JSON snapshots, DBML export, and an interactive ERD explorer (React Flow) from live databases.

  • Management commands: generate_database_doc, export_schema_json, export_ai_schema, schema_diff, generate_erd.
  • FK graphs, business‑context heuristics, and per‑table SQL/ORM examples for developers and AI agents.
  • Live demo on GitHub Pages; documented integration with InsightAI for NL→SQL pipelines.
  • Supports PostgreSQL, MySQL, SQL Server, SQLite, Oracle, and other Django backends.

Professional Experience

Full‑Stack Developer

Feb 2020 – Present
iSightsCare · United States (Remote)
  • Built and maintained Android apps in Java and Kotlin for many years; last 2+ years on Kotlin Multiplatform (KMP) shipping shared logic to Android and iOS.
  • Designed and maintained Django 5/6 backends; PostgreSQL and MSSQL with query optimization.
  • Built role‑based authentication, dashboards, and React frontends on Django REST APIs.
  • Developed Next.js pages with SSR and SEO for key user‑facing product flows.
  • Implemented real‑time messaging (Socket.IO) and Celery/Redis for async jobs and notifications.
  • Integrated Stripe, Firebase push, multi‑language UI, time zones, and Google Calendar.
  • Containerized with Docker; configured CI/CD; enforced JWT, CSRF, and CORS security policies.

Freelance

Web & Android Developer

2018 – Present
  • Android apps in Java and Kotlin since 2018 — Jetpack Compose, Room, Hilt (e‑commerce, reservations, messaging).
  • Kotlin Multiplatform (KMP) for Android & iOS — shared business logic with platform‑native UI.
  • Django and PHP backends with React frontends; JWT‑secured WebSocket real‑time features.

🌐 Languages

Persian: Native

English: Professional

🎓 Education

B.S. Software Engineering
Ilam University, Iran · 2013 – 2017