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About

I build search and the backends behind it.

I'm Ayesh Rehman, a backend and AI search engineer in Karachi. I have spent more than seven years building backend systems.

What I work on now

In my full-time role I build production AI search for a US company. That work is under a non-disclosure agreement, so I don't name the client, describe its data or show its architecture here. Everything on this site comes from my own projects, which I can show in full.

Where I've worked

  1. 2023 to nowStaff Software Consultant, 10PearlsBackend and AI platforms. Currently AI search for a US client under NDA.
  2. 2021 to 2023Associate Team Lead, Salsoft TechnologiesReact Native and backend delivery across fitness, e-commerce and computer vision products.
  3. 2019 to 2021Senior Mobile Applications Developer, Interlink Multimedia (Jang Media Group)Geo News, Geo Super, HarPal Geo and Jang Newspaper apps, about 20M+ installs combined.
  4. 2019Mobile Applications Developer, Salsoft TechnologiesReact Native consumer apps and native modules.

How I work

I measure before I change things. A search system gets a fixed set of test questions and a score before and after each change. I keep the failed attempts in the write-up, because they explain why the final design looks the way it does.

How I build AI search
  1. UnderstandRead what the user meant: fix typos, pull out filters like price or size.
  2. RetrieveSearch keywords and embeddings together over your own data.
  3. RerankReorder the results so the best match comes first.
  4. AnswerReply only from what was retrieved, with the sources shown.
  5. MeasureScore a fixed set of real questions before and after every change.

Elsewhere