Regee
Casañaレジー・カサーニャ

Software Developer

• ▸Collaborated with Romania-based international development team to architect and develop Zendesk integration connector for Polyglot translation platform, implementing OAuth 2.0/Azure AD B2C authentication, per-agent OAuth and real-time WebSocket/SignalR protocol translation enabling 100+ customer support agents to access translation capabilities across 20+ languages.
• ▸Developed TypeScript migration of legacy JavaScript e-commerce platform with Domain-Driven Design and Prisma ORM, creating 800+ item migration checklist and implementing 18-state Shopee return/refund state machine for presales demonstration and internal product development.
• ▸Contributed to MediGuide healthcare platform by developing serverless AWS Lambda function for insurance policy verification, integrating with external insurer APIs using OAuth2 authentication, implementing AWS Parameter Store for encrypted credential management, and scalable multi-insurer architecture with GDPR compliance.
• ▸Engineered Python CLI migration tool for PDIC client, migrating 10,000+ historical tickets from Excel to Zendesk with zero data loss and 80% time reduction compared to manual migration.

Software Engineer

• ▸Led and mentored a team of 4 developers through two major platform versions, progressing from initial VPS deployment to production-grade AWS infrastructure with Docker and GitHub Actions CI/CD, achieving 8+ months of continuous operation serving DRRM offices in the Philippines.
• ▸Architected and rebuilt KloudTrack IoT platform from Version 1 to Version 2 (enterprise-grade), implementing distributed architecture integrating ESP32 firmware, MQTT over TLS, Socket.IO real-time communication, and AWS services (IoT Core, S3, EC2, IAM).
• ▸Built high-performance backend systems including custom LRU cache achieving 90%+ hit rate, MQTT telemetry pipeline with <100ms latency, and WebSocket infrastructure supporting 100+ concurrent users with real-time presence tracking.
• ▸Implemented production-grade security with X.509 PKI certificate-based device authentication, JWT with refresh tokens, multi-tier rate limiting, and AWS S3-based OTA firmware update system with checksum validation.
• ▸Developed React 19 frontend using TanStack stack, Tailwind CSS 4, and Mapbox GL for interactive weather visualization with 24-hour timeline animation, supporting multi-tenant SaaS for 25+ weather stations across 4 station types.

Full-Stack Developer

• ▸Developed comprehensive carbon footprint tracking application for Philippine organizations using Next.js 15, React 19, TypeScript, PostgreSQL, and Prisma ORM with 21 API endpoints and 13 database models.
• ▸Built scientifically-backed calculation engine using EPA, IPCC AR5, and Philippine DOE 2024 emission factors for Scope 1, 2, and 3 emissions tracking.
• ▸Created automated PDF/Excel reporting system with Recharts visualizations for emissions breakdown by scope, category, and time period.

Software Engineering Intern

• ▸Gained hands-on experience with IoT systems and applied cybersecurity practices.
• ▸Enhanced and maintained the company's web application and optimized the codebase.

Bachelor of Science in Computer Science

Graduated Cum Laude with latin honor, specializing in software engineering, algorithms, and system design. Developed strong foundation in programming languages, database management, and software development methodologies.

Science, Technology, Engineering and Mathematics (STEM)

Graduated with Honor. Focused on mathematics, science, and technology fundamentals that provided a strong foundation for computer science studies.