Igor Markin

Senior Full-Stack Engineer

I build LLM‑powered products that hold up in production.

11 years in web development: 5 as a freelancer and 6 in product teams, including a team lead role. I work mostly on the backend with Python, Node.js, TypeScript and PostgreSQL.

Open to Senior Full-Stack and Backend roles · Israel or remote

Email me LinkedIn GitHub
Portrait of Igor Markin

Results

$40 → $0.50

Cost of one article after the LLM content pipeline I designed at Adzz. It served 58 projects.

1000s a day

External sites handled by my Playwright automation, including sites without APIs.

2 min → 2 s

Load time of key admin pages at Claustrophobia after SQL optimization and caching.

Own products

Torhair admin: notifications, menu and calendar screens

In production

Torhair

A mobile-first booking system for an independent hairstylist in Israel. It replaced manual scheduling, chats and spreadsheets. Online booking, a mobile admin, reminders, protection against double booking, verified backups.

TypeScript · React Router · Node.js · SQLite · Docker

Project page →

Hebrew Live window with Hebrew speech and its English translation

Open source · macOS

Hebrew Live

Live Hebrew transcription with translation next to it. Recognition and translation run locally on Apple Silicon, without a cloud service. I measured latency on real recordings and made the first draft appear 24% sooner.

Python · MLX · TypeScript · React · Electron

Project page →

Live Markdown Preview editor with source and preview side by side

Open source · Product Hunt

Live Markdown Preview

A local-first Markdown editor. No account and no backend: drafts stay in the browser. Rendering in a Web Worker, sanitized HTML, recovery of unsaved edits, conflict detection across tabs.

TypeScript · Preact · Vite · IndexedDB · Cloudflare Workers

Project page →

Experience

  1. Mar 2026 – now

    Defacta

    Lead Engineer · Contract

    • Early-stage startup that helps people check claims and sources with LLMs. Lead engineer in a team of six.
    • Took the product from a backend pipeline to a web app and a Chrome extension in production.
    • Owned architecture, releases and production support. Compared models by quality, speed and cost.

  2. Mar 2023 – Apr 2026

    Adzz

    Team Lead, from Aug 2023 · Senior Software Engineer before that

    • Designed an LLM content pipeline from scratch: $40 → $0.50 per article, 58 projects. Business-critical rules stayed in code, not in prompts.
    • Built the internal platform: CRM, marketplace and QA bots.
    • Introduced code review and CI/CD, mentored four engineers and stayed hands-on.

  3. 2021 – 2023

    Claustrophobia

    Backend Developer · Python, Django

    • Django backend and internal admin tools for a network of escape rooms.
    • Restored a broken migration history so the team could deploy safely again.

  4. 2020 – 2021

    Legsy

    Python Developer

    • Fintech MVP for retail investors: brokerage API integrations and real-time stock alerts.

  5. 2015 – 2020

    Freelance

    Web Developer

    • 70+ websites for small businesses, mostly on WordPress. Full cycle, directly with business owners.

How I work

I own the design

I use AI coding agents every day. I write the requirements and architecture, review every change and test the result myself.

Reliability is a feature

Tests, migrations, backups and monitoring are part of the product, not a later task.

Close to the product

I do best in small teams where I go from an unclear request to a working release and stay after launch.

Skills

Backend
Python, FastAPI, Django, Node.js, PostgreSQL, Redis, Celery, REST APIs
Frontend
TypeScript, React, Preact, Vite, Electron
AI
LLM APIs, AI agents, model evaluation, local models on MLX
Quality and delivery
Docker, Playwright, Vitest, CI/CD, monitoring, Cloudflare Workers

Contact

Building a product with AI? Let’s talk.

Full-time or contract through my Israeli business. Northern Israel, hybrid around Haifa or fully remote. I speak English and Russian; my Hebrew is basic.

9588604@gmail.com LinkedIn GitHub