Omar A.

Senior Full-Stack Engineer and System Architect with 6+ years of experience building SaaS and business platforms. I specialize in backend systems, integrations, asynchronous processing, and production reliability, and can take features from API and data design through the user interface and deployment.

Recent work includes contributing to Haseem, a Saudi e-invoicing and accounting SaaS with ZATCA compliance workflows, and re-architecting Pintar Investments’ e-invoicing platform from GCP serverless services to Dockerized VPS microservices using Node.js, Redis, and BullMQ. I built background workflows for CSV validation, UBL XML generation, LHDN submissions, status polling, and monitoring.

I have also delivered Laravel and React features for supply-chain and ERP systems, improved API and database performance, and built multi-tenant e-commerce, travel, and medical-lab applications.

Core stack: Node.js, TypeScript, React, FastAPI/Python, Laravel/PHP, PostgreSQL, MySQL, Redis, BullMQ, Docker, and VPS/cloud infrastructure. I can help build SaaS features, APIs and integrations, background job pipelines, ERP workflows, or improve performance and reliability in an existing product.