📍 Metro Manila, Philippines • B.S. Information Technology (PLV, 1.03 Running GWA) • CTF Silver Medalist

I build full-stack systems and production AI architectures with strict security-first engineering. My focus centers on bounded agentic systems, hybrid neural retrieval (BM25 + Dense RRF), and resilient edge IoT computer vision, engineered with defensive AppSec principles (RBAC, PII redaction, Row-Level Security).

• 🎓 Academic Standing: Senior B.S. Information Technology student at Pamantasan ng Lungsod ng Valenzuela (PLV) — 1.03 Running GWA, Consistent Dean's Lister.
• 🛡️ Defensive Mindset: Hands-on competitive CTF player (HTB, PicoCTF, ITlympics) applying threat modeling and vulnerability hunting to audit web services from the outside in.
• 🎨 Design Rigor: TESDA Visual Graphics Design NC III certified, bringing high typographic polish and design system consistency to complex data-heavy interfaces.

JUN 2026 – PRESENT • Remote

• Retrieval Accuracy: Architected and deployed an autonomous FastAPI AI sidecar microservice, increasing Top-1 retrieval accuracy from 81.8% to 86.4% on ground-truth benchmarks by fusing BM25 (SQLite FTS5) and dense vector search via Reciprocal Rank Fusion (RRF, $k=60$) with deterministic blend reranking.
• Hallucination Elimination: Engineered a bounded 3-step agentic query loop with cosine similarity gating ($<0.50$ threshold) and inline numbered citations, achieving a 100% negative query pass rate and 90% LLM-as-judge relevance score (llama-3.3-70b).
• Latency & Telemetry: Reduced time-to-first-token (TTFT) by ~65% via asynchronous Server-Sent Events (SSE) streaming APIs, backed by Prometheus /metrics latency histograms and a 6-chart Dockerized Grafana monitoring dashboard.

JUN 2026 – PRESENT • Marikina (Hybrid)

• Statutory Compliance: Ensured 100% DOLE compliance across 4 enterprise HRIS applications by auditing payroll calculation engines and implementing interval-partitioned time algorithms to isolate 10 PM – 6 AM night differentials from standard overtime multipliers.
• Automated Payroll: Automated statutory multi-tier deductions and 13th-month proration across 500+ employee records using TypeScript/Next.js calculation modules for progressive SSS/WISP, PhilHealth, and Pag-IBIG regular/MP2 brackets with immutable audit trails.
• Multi-Tenant Security: Hardened PostgreSQL and Supabase data layers against cross-branch data leaks by enforcing strict branch-scoped row-level security (RLS) query constraints.
• CI/CD Acceleration: Cut runner execution times by 40% (~12m down to ~7m) in GitHub Actions and Jenkins by architecting an offline mock testing daemon that eliminated flaky external DNS timeouts.
• Sprint Leadership: Led sprint execution and technical code reviews across 180+ Jira/GitHub issues as Intern Team Lead, enforcing TypeScript type safety and clean architecture standards.

Decoupled Dual-Engine Architecture: Core Web Monolith + Autonomous FastAPI AI Sidecar

• The Challenge: The university library required fast, reliable catalog search and automated Q&A over institutional research docs without vendor lock-in, hallucinations, or crashing the primary web server.
• Architecture & Engineering:
  • Decoupled a Laravel 11 monolith (PHP 8.4, PostgreSQL, Livewire 3, MaryUI, QR borrowing) from an external FastAPI AI Sidecar (PSergio984/ceit-ai-sidecar).
  • Implemented hybrid neural retrieval fusing SQLite FTS5 (BM25) with all-MiniLM-L6-v2 dense embeddings using Reciprocal Rank Fusion (RRF, $k=60$), lifting retrieval from 81.8% to 86.4% Top-1.
  • Bounded agentic loop with cosine similarity gating ($<0.50$) that forces deterministic refusal on zero context, completely eliminating out-of-domain hallucinations.
• Verification & Telemetry: 600+ PHPUnit tests, 78 pytest tests, evaluated against a 27-case golden set ($P@5$: 0.45, $R@5$: 0.72, Top-1: 86.36%). Monitored via Prometheus latency histograms and Dockerized Grafana.

Solar-Powered Edge IoT Flood Surveillance System for Barangay Maysan

• The Challenge: High-resolution flood monitoring in remote, low-bandwidth urban waterways with strict solar battery constraints and severe network dropouts.
• Architecture & Engineering:
  • 92% Compute Reduction: Decoupled a lightweight 15-second camera feed for live human monitoring from a 3-minute server-side YOLOv8 inference cycle, slashing continuous compute demands and preventing thermal throttling on Raspberry Pi Zero 2W.
  • Sensor & Decision Fusion: Engineered a composite 0–100 hazard scoring algorithm fusing ultrasonic depth telemetry (JSN-SR04T) with debris detection (YOLOv8) and weather API alerts.
  • Alert Fatigue Prevention: Integrated 3-tier hardware LEDs (Safe/Warning/Critical) with SMS/push notification throttling enforcing a strict 30-minute cooldown.
  • Dataset Engineering: Curated and annotated 5,000 drainage images on CVAT.ai with OpenCV frame quality pre-filtering.

• AI, RAG & Vector Systems: FastAPI, LangChain, LangGraph, pgvector, Pinecone, ChromaDB, SQLite FTS5 (BM25), Hybrid RRF Search, YOLOv8, OpenCV, Prometheus, Grafana, LLM-as-Judge Evaluation, Server-Sent Events (SSE)
• Languages: TypeScript, JavaScript (ES6+), Python, PHP (8.4), C# / .NET, Java, SQL
• Frontend & UI: Next.js (App Router), React 19, Tailwind CSS v4, shadcn/ui, MaryUI, Filament 4, Livewire 3, Alpine.js, Zustand, Figma
• Backend & Databases: FastAPI, Laravel 11/12, Node.js, PostgreSQL, Supabase, Redis, MySQL, MongoDB, SQLite
• Cloud, DevOps & Tooling: Docker, Jenkins, GitHub Actions, AWS, Google Cloud (GCP), Vercel, Cloudflare, Render, Railway, Vite, Sentry
• Defensive Security & AppSec: Burp Suite, Wireshark, Kali Linux, Role-Based Access Control (RBAC), Row-Level Security (RLS), PII Masking, OWASP Top 10 Auditing

• 🥈 Silver Medal (CTF) | ITlympics 2026 — Pamantasan ng Lungsod ng Valenzuela
• 🥇 Gold Medal (Quiz Bee) | ITlympics 2025 — Pamantasan ng Lungsod ng Valenzuela
• 🥉 Bronze Medal | Gamecon 2026 — Pamantasan ng Lungsod ng Valenzuela
• 🎖️ Representative (Cybersecurity Quiz Bee) | 14th National IT Olympics — University of Makati