Full Stack & AI Software Engineer
Nir Feinstein
Senior Full-Stack Engineer with 14 years of experience as a developer, educator, and app creator. I focus on writing clean, scalable, and maintainable production-ready code, turning complex problems into elegant digital solutions.
Explore my projects
Skills
- React
- Next.js
- TypeScript
- NestJS
- Node.js
- Python
- FastAPI
- PostgreSQL
- MongoDB
- Redux
- Tailwind CSS
- Storybook
- Jest
- Playwright
- WebSockets
- OAuth2
- Microservices
- Docker
- Kubernetes
- Terraform
- AWS
- GCP
- Azure
- Serverless
- CI/CD
- LLM APIs
- AI Agents
- LangGraph
- MCP
- Electron
- Flutter
- Swift
- Android
My Portfolio
A collection of my professional jobs, freelance projects, personal products, and teaching.
Full Stack Works
5
Base.ai
Senior Full Stack Engineer: autonomous AI agent workflows with QA, code review and fix loops
- React
- NestJS
- Python
- AWS
Easysend
Senior Full Stack Engineer, frontend oriented: no-code journey builder for insurers and banks
- React
- TypeScript
- Python
- AWS
In-House Health
Full Stack Engineer: AI-driven nurse scheduling platform, built from the ground up
- React
- FastAPI
- GCP
Prometheus Inspiring Technology
Software Engineer: Android app and C# backend services
- Android
- C#
- Backend
IDF, Matspen unit (Mamram)
Software Engineer: C# enterprise systems, WCF services and WPF clients
- C#
- WPF
- WCF
Contract Developer
5
Insait
Senior Full Stack Engineer, contract: LLM assistants for banks and financial institutions
- React
- Node
- Python
- LangChain
- Docker
- Azure
Hexagate
Frontend Engineer, contract: Web3 security platform, now part of Chainalysis
- React
Suridata
Full Stack Engineer, contract: SaaS security platform, now part of Fortinet
- React
- Node
Dipio Systems
Android Developer, contract: push-to-talk instant communication app
- Android
Full Stack Bootcamp Lecturer
4
HackerU
Full Stack Lecturer: HTML, CSS, JavaScript, React and Node.js bootcamp
- HTML
- CSS
- JS
- React
- Node
Scale Up Velocity (Startup Nation Central)
Full Stack Lecturer: full-stack course in its tech talent programs
- HTML
- CSS
- JS
- React
- Node
Apps & Projects
16
Betterloop
Check a public website for speed, search and security, then see what to fix first.
- Founder & Developer
- Website audits
- Monitoring
Plainer
A workspace for your notes, files and boards. Edit the starter workspace without an account.
- Founder & Developer
- Productivity
- Workspace
OnlinePages
Landing Page and Personal Website Builder
- Founder & Developer
- SaaS
- Builder
- No-Code
WebSkins
Restyle a website with a plain-language prompt. Uses your own Anthropic API key.
- Founder & Developer
- AI
- Chrome Extension
Modurobot
Explore a free 3D robot simulator and compare parts for an SO-101 build.
- Robotics
- 3D
- Parts guides
Hired in 60
Short visual lessons for software and AI interviews, with a Start Here playlist.
- Interview prep
- Short videos
- Education
Human in da Loop
Self-hosted software that lets AI agents ask your team for help or approvals.
- AI agents
- Self-hosted
- Approvals
AI Your Work
A free guided assessment to find practical AI and automation workflows for your business.
- AI workflows
- Business
- Assessment
Concepts
2
Small Living
Concept: a Modular Electric Camper You Configure in 3D
- Concept
- 3D
- Configurator
- EV
Open Source
Tools I build and maintain in the open, mostly for AI agents and developer workflows.
- Agent prompt
most-capable-agent-system-prompt
System prompt and architecture for self-improving agents (870+ stars).
885 - macOS utility
mac-keepawake
Keeps your Mac fully awake, even with the lid closed, and dims the backlight while it's shut.
Shell2 - Agent harness
agent-harness
Skills, rules and hooks that make Claude Code or Codex act as a product team, a CEO or a portfolio manager, and finish what they start.
Shell - Agent skill
frugal
Before your agent buys, subscribes or upgrades anything, it finds the cheaper honest way: right plan, programs, verified codes, alternatives.
JavaScript2 - Agent memory
Recall
Your Claude Code memory in every agent: shares Claude Code's auto memory with Codex, Cursor and others over MCP.
JavaScript - Android app
Handy AI
Android assistant that completes tasks on your phone (Kotlin).
Kotlin - Claude Code plugin
Flipback
An automatic /goal for Claude Code: when a turn ends with the work unfinished, it sends the agent back.
JavaScript1 - MCP server
Conductor
Verified, retried and fallback-backed commands for Claude Code, served as MCP tools.
TypeScript - Agent auth
account-access
Scoped, resumable account access for coding agents, with OAuth renewal.
Python - Eval harness
RegressGuard
Self-hosted CI eval harness for prompt regression testing (Docker + CLI).
Python - CLI
standup
Generates a standup update from git commits in one command.
JavaScript
Let's Connect.
Got a project, a question, or just want to chat? I'm all ears. Drop me a line below or send an email my way.