Abdullah Hashim

• Architected and built self-paced simulation engine for enterprise client Procore, enabling automated training workflows without facilitator dependency
• Solved complex state management challenges by automating round transitions, replacing manual facilitator controls with intelligent progression logic
• Established testing foundation from zero - implemented comprehensive test suite and CI/CD pipeline, significantly improving developer confidence and deployment reliability
• Made key architectural decisions for self-paced feature supporting enterprise-scale business training simulations

Tech Stack: Next.js, React, TypeScript, Prisma, PostgreSQL, Tailwind CSS

• Built custom workflow automation engine enabling employers to create 13-stage hiring pipelines with automated status transitions and email triggers
• Developed offer letter system for enterprise client Florida Marlins, streamlining contract delivery for major league sports organization
• Integrated complex third-party HR systems including Checkr (background checks), Rippling, and InflectionHR with custom data mapping and API orchestration
• Optimized reporting queries for multi-tenant architecture, solving performance bottlenecks for clients managing multiple organizations and large candidate datasets
• Implemented Elasticsearch-powered candidate search, improving recruiter efficiency across full-stack Rails application
• Delivered full-stack features across entire ATS platform, touching all aspects of candidate management and recruiting workflows

Tech Stack: Ruby on Rails, PostgreSQL, Elasticsearch

• Mentored and led team of 3 junior developers while architecting in-stadium food delivery platform for the Dallas Cowboys' NFL venue
• Transformed application stability from weekly firefighting to zero-downtime operations, eliminating need for active monitoring during game days
• Solved critical production bug minutes before Dallas Cowboys game, preventing $30K+ revenue loss through real-time debugging under extreme pressure
• Built React Native operations app enabling stadium staff to print receipts and manage orders efficiently during live events
• Developed concession worker administration interface, streamlining stadium staff workflows and order management
• Built comprehensive test coverage and automated CI pipeline, reducing deployment errors and enabling confident releases
• Integrated Rails application into Dallas Cowboys mobile app, delivering seamless in-seat food delivery experience to NFL fans

Tech Stack: Ruby on Rails, React Native, PostgreSQL, CI/CD

rhythmiq

Developed and deployed a full-stack, multi-tenant application for music instructors and students.

Key Features:

• Built complex scheduling engine handling recurring lessons, timezone conversions, and automated conflict detection
• Implemented secure payment processing with automated transaction tracking and fee distribution
• Integrated Zoom API for seamless video lesson creation and participant management
• Deployed using Kamal with zero-downtime deployments to DigitalOcean production environment

Tech Stack: Ruby on Rails, PostgreSQL, Hotwire, Tailwind CSS

Ruby for Good (Stocks in the Future)

Led Rails 8 migration and modernization effort for financial literacy education platform.

• Implemented Rails 8 upgrade
• Modernized asset pipeline by migrating to importmap-rails and Propshaft
• Established comprehensive CI pipeline and development workflows
• Improved test coverage and reliability

Tech Stack: Ruby on Rails, PostgreSQL, TailwindCSS