Senior Ruby on Rails developer, 10+ years. Most recent work via Toptal:
- Fullscript: built an unauthenticated storefront (catalog, guest checkout, org branding) and an enterprise catalog-restrictions policy engine — GraphQL mutations, caching, search integration.
- Desertcart: refactored a legacy Google Merchant Center disapproval system spanning ~300 accounts (150K–15M products each). Cut CPU 70%+ and reduced runtime from days to hours; added New Relic dashboards + Slack alerting to prevent account suspensions.
- Toptal Core Team (3 years): scalable architecture for an internal engineering-insights platform serving 600+ engineers across GitHub/Jira; convention-driven design + a custom Rails generator so new metrics ship fast. Also rebuilt parts of screening ops on a high-volume platform.
- Earlier: online casino platform (30+ payment gateways, anti-addiction compliance for 1M+ players) and team lead at Cybage.
OSS: small contributions to Devise, CanCanCan, and Kamal.
Side project:
JustInvoicIt (Rails 8 + Hotwire) for freelancer invoicing. Currently experimenting with an MCP server using OAuth.
Looking for: Senior/Staff Backend or Full-Stack Rails roles. Comfortable owning architecture, mentoring, and shipping end-to-end.
Remote: Yes — worldwide remote only
Willing to relocate: No
Technologies: Ruby, Rails, PostgreSQL, Redis, Sidekiq, GraphQL, Hotwire/Turbo, RSpec, Docker, Kamal
Résumé/CV: https://www.linkedin.com/in/ahmad-hamza-0b812052
Email: ahmadhamza19@gmail.com
Senior Ruby on Rails developer, 10+ years. Most recent work via Toptal:
- Fullscript: built an unauthenticated storefront (catalog, guest checkout, org branding) and an enterprise catalog-restrictions policy engine — GraphQL mutations, caching, search integration.
- Desertcart: refactored a legacy Google Merchant Center disapproval system spanning ~300 accounts (150K–15M products each). Cut CPU 70%+ and reduced runtime from days to hours; added New Relic dashboards + Slack alerting to prevent account suspensions.
- Toptal Core Team (3 years): scalable architecture for an internal engineering-insights platform serving 600+ engineers across GitHub/Jira; convention-driven design + a custom Rails generator so new metrics ship fast. Also rebuilt parts of screening ops on a high-volume platform.
- Earlier: online casino platform (30+ payment gateways, anti-addiction compliance for 1M+ players) and team lead at Cybage.
OSS: small contributions to Devise, CanCanCan, and Kamal.
Side project: JustInvoicIt (Rails 8 + Hotwire) for freelancer invoicing. Currently experimenting with an MCP server using OAuth.
Looking for: Senior/Staff Backend or Full-Stack Rails roles. Comfortable owning architecture, mentoring, and shipping end-to-end.