Building tech-forward systems for real business operations, secure workflows, and modern product experiences.
I work across internal business platforms, backend engineering, infrastructure, e-commerce operations, security controls, and flagship web apps. My portfolio is built to show depth, ownership, and ship-ready execution.
Positioning
Systems builder with delivery depth
This site presents more than app screens. It highlights architecture, operations, delivery, security posture, and the kind of real-world constraints that matter inside companies.
The strongest signal here is range with ownership: from PHP/MySQL business systems to modern TypeScript builds, from hosting and integrations to reporting, automation, and defensive controls.
A broader GitHub showcase that reflects both flagship work and practical business builds.
This section now covers more of your public GitHub footprint so visitors can see both your polished standout apps and the systems that prove your day-to-day engineering range.
A polished hiking planner with Google OAuth, calendar sync, notifications, background jobs, and security-first API patterns.
A personal health record companion with dashboards for medications, appointments, lab data, vitals, exports, and document handling.
A secure internal request system for approvals, assignments, attachments, and operational routing built around real office workflows.
A phishing-defense-focused desktop security tool using policy logic, DNS filtering, suspicious link scoring, and reporting workflows.
A modernized cheque scanning and OCR review system with secure uploads, admin workflows, auditability, and export-oriented processing.
A role-aware task and reporting platform supporting employee operations, management workflows, file handling, and structured updates.
An in-house diagnostic e-commerce platform built for actual business operations, catalog handling, and product presentation.
A web-based reporting system with separate user and manager views for submission, analysis, and report visibility.
An early from-scratch e-commerce system with product management, admin workflows, and customer-facing pages built on PHP and MySQL.
A quotation calculator built to compute pricing, tax, and cost breakdowns using practical business inputs.
A medicine inventory software project built with PHP and MySQL to track stock and support internal pharmacy-style operations.
A machine learning project using YOLOv5 for skin disease detection based on sample datasets from the Philippines.
Work that spans engineering, implementation, operations, and secure system ownership.
My career path combines backend delivery, internal tooling, infrastructure responsibility, and security-related execution. That combination is what I bring into both company systems and portfolio projects.
IT & E-Commerce Business Lead
Pharmastar International Trading Corporation
- Owns the design, deployment, and protection of business-critical systems spanning software, infrastructure, and online retail platforms.
- Builds PHP/MySQL internal tools for task management, inventory, invoicing, permissions, audit logs, and reporting.
- Manages Linux/Windows servers, DNS/SSL, backups, DR routines, patching, and least-privilege security practices.
- Supports secure data workflows, e-commerce growth, and AI-assisted app delivery while keeping architectural and permission control in place.
SDE (Backend Developer)
SmartByte Solutions
- Led delivery of a client web platform while handling backend engineering and project coordination.
- Built OAuth-based integrations with TikTok and Meta Ads APIs, including token exchange, refresh handling, and structured ingestion.
- Customized websites in Wix Studio (Velo) with JavaScript logic, dynamic collections, conditional rendering, and API functionality.
- Managed hosting setup, database integrity, system performance, and technical communication with non-technical stakeholders.
SDE L1 Engineer
Hexaroot Solutions
- Handled technical project execution, on-site audits, hardware testing, maintenance, and support coordination.
- Balanced field troubleshooting with stakeholder management and delivery follow-through.
IT Associate Support
Isidro, Redoble & Associates
- Supported internal and client-facing technology initiatives, including surveys, prototypes, QA, documentation, and process improvement.
- Contributed to software ideation, troubleshooting, and operational support across multiple projects.
Information Security Intern
DFI Retail Group
- Worked on security tickets, reporting, vulnerability scans, endpoint protection support, backups, disaster recovery support, and remediation visibility.
- Collaborated with vendors and internal teams to help maintain the confidentiality, integrity, and availability of enterprise systems.
A profile built around what I actually do in the field, not just what looks good on a list.
The strongest part of my skill set is the ability to move across code, servers, workflows, security, integrations, and operations while keeping systems usable and maintainable.
Full-Stack & Product Engineering
Infrastructure & Delivery
Security & Governance
Business Systems & Operations
Verified profile signals from education, LinkedIn-visible credentials, and published work.
This area combines academic recognition, public credential entries, and your ACM publication so the portfolio feels stronger and more complete without relying on filler content.
Certificates & Test Scores
LinkedIn-visible entries
TOEIC Listening and Reading
LinkedIn test score entry
Score: 970 (C1)
TOEIC Speaking and Reading
LinkedIn test score entry
Score: 380 (B2)
Publication
ACM-indexed paper
SenSabong: A sensor-based Application for the aid of training Cocks for CockFighting
Publisher: Association for Computing Machinery (ACM)
Venue: ICCDE '24: Proceedings of the 2024 10th International Conference on Computing and Data Engineering
Published: April 11, 2024
Pages: 133–140
DOI: 10.1145/3641181.3641198
Authors: William P. Rey, Shreyansh M. Jain, Juan Carlos S. Lambino, Zachary Josh T. Raymundo
B.S. Information Technology, Major in Cybersecurity
Mapúa University · 2023
Dean’s List and President’s List Awardee.
HNICEM 2021 Nominee
Academic recognition
Recognized as a nominee for the International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management.
Best ICT Project
San Beda College Alabang
Awarded during Senior High School STEM studies.
Open to strong engineering, systems, backend, and security-aware opportunities.
Whether the role is full-stack, internal systems, backend engineering, business technology, or security-focused product development, this portfolio is designed to show how I build and deliver in real operating environments.