I'm Haider Zaman, a full-stack & backend engineer, currently building the programmatic ad-tech stack at Advergic and freelancing on Upwork (Top Rated).
I like building systems that have to work under real constraints, not just pass a demo. Low-latency bidders, identity graphs, fraud detection, tracking infrastructure, things where being 50ms late or slightly wrong actually costs money.
Lately I've:
- owned and shipped an end-to-end programmatic advertising platform: real-time bidding, identity resolution, bot detection, attribution, SDK, and analytics pipeline.
- built marketplace and e-commerce integration backends that normalize messy multi-platform data into something usable.
- designed and shipped AI-powered features using embeddings, similarity search, and generative models in production apps.
- prototyped and launched Android apps, Shopify plugins, SaaS tools, and Chrome extensions, mostly because I got curious and couldn't stop.
- written about RAG, MCP, agentic coding, and backend patterns at developersarchive.com.
If you need something built or just want to talk shop, find me on LinkedIn · Email.