Architecture
- Product architecture
- System design
- Infra architecture
- Microservices
- Multi-tenancy
- Distributed systems
HASSAN ZEAITER
Engineering Team Lead @ OLX Lebanon — software & product engineer focused on systems & infrastructure architecture across PHP, Go, Python & JS/TS, while sharpening my data, ML & AI engineering along the way.
- 13+Years building
- 20+Products shipped
- ∞Cups of coffee
01
The Editorial
Self-taught engineer, product-minded, and stubborn about shipping. I've been building for the web since 2011 — and today I lead engineering at OLX Lebanon.
I started out freelancing in 2011, moved into company roles by 2015, and in 2019 co-founded Codeminos, a dev studio, right through Lebanon's economic collapse — we delivered several large-scale products before the country's instability forced us to close. I'm a polyglot engineer — PHP/Laravel, Go, Python and the JS/TS world (Node, React, React Native) — but what I really do is architecture: product, system and infrastructure design, and fast, reliable services.
At OLX I'm spearheading an end-to-end architectural rebuild and leading a cross-functional team across mobile, frontend and QA — turning product goals into architecture, sprint plans and shipped features. Architecture stays the core of what I do — and alongside it I'm actively learning data, ML & AI engineering: pipelines, analytics and LLM-powered features, and what it takes to run them in production.
- Now Engineering Team Lead, OLX Lebanon
- Focus Architecture · Scalable systems
- Learning Data · ML · AI engineering
- Based Beirut, Lebanon · Remote-friendly
02
The Toolkit
Languages
- PHP
- Go
- Python
- TypeScript
- JavaScript
- SQL
Frameworks & Runtime
- Laravel
- Node.js
- React
- Next.js
- React Native
- Livewire
Data & AI
- Data engineering
- Pipelines & dbt
- ML / AI engineering
- LLMs & agents
- Prompt engineering
- Analytics / BI
Infra & DevOps
- Docker
- Terraform
- CI/CD
- Nginx
- Cloud
- Observability
Data Stores
- MySQL
- PostgreSQL
- Elasticsearch
- Redis
- Schema design
Leadership & Craft
- Team building
- Mentorship
- Code & architecture review
- Product thinking
03
The Résumé
-
NOW
Engineering Team Lead · OLX Lebanon · Jun 2025 — Present
Spearheading the end-to-end architectural rebuild of the OLX Lebanon ecosystem for scale and reliability. Lead a cross-functional team (mobile, frontend, QA), drive core tech decisions, and tune Elasticsearch to serve fast search across millions of listings.
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2023
Product Engineer / Senior Backend · Qualizone · Mar 2023 — May 2025
Built and maintained scalable APIs powering web and mobile apps, mentored junior devs, led code reviews, and shaped product direction and architecture with the product manager.
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2022
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2019
Co-Founder & CTO · Codeminos · 2019 — Feb 2023
Co-founded a dev studio through Lebanon's economic crisis. Owned technical strategy and backend/API delivery for Gulf & Lebanon clients — e-commerce, delivery, POS and SaaS products.
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2019
API Developer · Barq App (KSA) · Aug 2019 — Feb 2020
Six-month contract building core backend for Barq, a fast-growing Saudi courier & logistics app — order handling, courier tracking and delivery workflows.
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2018
Senior Backend Developer · IdeaToLife · Mar 2018 — Jun 2019
Built APIs, CMSs and full web solutions across many clients, mentored juniors, and helped align tech choices with business goals.
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2016
Fullstack Web Developer · LibanCall Plus · Sep 2016 — Feb 2018
First developer in a newly formed tech department — built and maintained full-stack apps, and grew into mentorship and light management as the team expanded.
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2011
Freelancing & Learning · Self-taught · 2011 — 2016
Where it started. Taught myself to code and took on freelance work — building sites, apps and APIs for clients while learning the craft from the ground up.
Want the full story? Connect on LinkedIn ↗
04
The Portfolio
№ 01 · OLX Lebanon
Platform Rebuild
End-to-end architectural rebuild of the OLX Lebanon ecosystem — future-proof system design and Elasticsearch clusters delivering ultra-fast search & filtering across millions of live listings.
Details on request →№ 02 · Tech Lead · 6-mo contract
Diggipacks
A warehousing & logistics SaaS — inventory and warehouse management with first-mile and last-mile flows, integrated with major Saudi payment and courier systems.
Details on request →№ 03 · Tech Lead · 2-mo contract
COFEE
A coffee-shops delivery marketplace — a mobile app in the Gulf. Joined the team for a full re-platforming of the product on a focused 2-month contract.
Details on request →№ 04 · Co-Founder & Tech Lead
Nakrashat
A mobile app delivering imported and local snacks — co-founded and led end-to-end: CMS, API and iOS / Android apps, from planning to launch.
Visit nakrashat.com ↗A selection of the work — see all works →
05
Let's make
Let's make
something.
Always happy to talk architecture, scalable systems and data & AI engineering.