Francis C.

Diagnosed and repaired incremental billing rollup regressions, optimizing cache invalidation, reuse, and bounded eviction to eliminate redundant scans and improve incremental and full recomputation correctness. Traced complex state and caching interactions across an existing billing engine, implementing constrained target fixes and validating results against correctness and performance benchmarks. Repaired an inline-cache regression in the Lumen runtime by tracing compiler bytecode execution through VM cache site handling, correcting cache site indexing, and implementing dynamic cache growth when programs exceeded initial cache capacity. Corrected object-shape transition and field-mutation behavior to preserve inline-cache validity across attribute updates, deletion/re-addition, prototype shadowing, and polymorphic access patterns. Validated the Lumen repair against documented benchmark workloads with all visible workload passing documented operation budgets.

Contributed to full-stack projects including an Airbnb clone and a travel app, delivering authentication, search/filtering, booking flows, and responsive UI components using React, TypeScript, Tailwind CSS, and PostgreSQL. Implemented DevOps practices on Ubuntu servers, including shell scripting for log rotation, backup scheduling, and environment setup automation to reduce setup time by 40%. Configured Nginx micro-caching to reduce response latency; hardened security using UFW firewall rules and SSH access controls; and monitored active connections and suspicious traffic using netstat, ss, and custom bash scripts. Containerized applications with Docker to manage multi-service environments and streamline deployment workflows across development and test environments. Leveraged AI tools such as Claude, Cursor, and ChatGPT to accelerate development, debug logic, and optimize workflows, reducing development time by ~

Built a Django REST Framework + PostgreSQL RESTful Recipe Management API with CRUD operations, role-based permissions, pagination, filtering, and Swagger documentation. Developed a full-stack Movie Recommendation platform with a React/TypeScript frontend and Django REST backend, using personalized recommendations, user preferences, and Redis caching to improve API performance. Contributed to full-stack projects including an Airbnb clone and a travel app, implementing authentication, search/filtering, booking flows, and responsive UI components using React, TypeScript, Tailwind CSS, and PostgreSQL. Implemented DevOps practices on Ubuntu servers including shell-script automation for log rotation, backup scheduling, and environment setup, reducing setup time by ~40%. Configured Nginx micro-caching, hardened security using UFW firewall rules and SSH access controls, and monitored active connections and suspicious traffic via netstat/ss and custom bash scripts. Containerized applications wi