Georges Hajjar

Architect and build a secure crypto payment gateway end-to-end, owning technical architecture and engineering decisions across a Node.js/Express, React, TypeScript, and PostgreSQL stack. Design and implement complex payment flows and gateway integrations, and enforce a security-first posture for a regulated financial domain.

Owned technical architecture and engineering decisions across a Node.js/Express, React, and PostgreSQL platform, setting the quality bar and reviewing all code merged to production. Architected and executed a database migration from MongoDB to PostgreSQL, implementing Row-Level Security (RLS) for multi-tenant isolation and pgvector for vector search.

Acted as senior engineer making architectural decisions independently and leading code reviews across a React, Angular, and Node.js/Express platform. Built and scaled production full-stack features and RESTful APIs for document management workflows handling sensitive data with a security-first approach.

Owned automated and manual testing strategies, applying strong code-review judgment to maintain a high quality bar before production. Built regression suites and QA processes that reduced post-release defect rates and strengthened production reliability and security.

Maintained production systems and infrastructure, diagnosing issues through analytical root-cause analysis to reduce resolution time.

Bachelor's Degree in Computer Science from the Arts, Science and Technology University in Lebanon, completed in 2020.