Vonn Harold A. Mamaril

Software Engineer

Full-stack Development • DevOps • Application Security

Building practical software from idea to deployment.

Versatile Software Developer and recent Computer Science graduate with hands-on experience building, deploying, and maintaining mobile and web applications. Experienced with React, Flutter, Node.js, PostgreSQL, Docker, GitHub Actions, and Linux, with exposure to CI/CD automation, containerized deployments, and application security practices. Experienced contributing across the software development life cycle: from development and testing to deployment and operations, and eager to grow in software engineering, DevOps, and security-focused roles.

Open to Software Engineering RolesOpen to Remote WorkOpen to Contract Work
Vonn Harold A. Mamaril

Education

National College of Science and Technology

Bachelor of Science in Computer Science

2022 - 2026

Training

Cisco Networking Academy

Introduction to Cybersecurity

July 2026

Work Experience

Titan Collection and Credit Management Inc.

Junior Programmer

January 2026 - Present

  • Made a local web application that converts Trivy JSON output and Lynis dat output into a clean web UI with AI integration suggesting additional actions and proper authentication for project or systems monitoring of the dev team.
  • Configured a local Prometheus and Grafana monitoring stack that fetches node-exporter data from two production droplets.
  • Developed, deployed, and maintained mobile and web applications supporting internal and business operations, using Flutter for mobile and web applications.
  • Designed and implemented CI/CD workflows using GitHub Actions to automate application builds and deployments.
  • Containerized web applications and PostgreSQL services using Docker Compose, deployed services to DigitalOcean, and managed Linux-based infrastructure through SSH.
  • Improved development reliability by incorporating automated security scanning and deployment checks into application workflows.

Titan Collection and Credit Management Inc.

IT Intern

December 2025 - January 2026

  • Designed and developed a PSGC-based REST API and integrated it across company mobile applications.
  • Adapted existing web application features into mobile applications while maintaining consistent data handling and user experience.
  • Optimized cloud database queries and data-fetching strategies to improve application performance and reduce unnecessary operations.
  • Performed manual quality assurance testing and documented issues using GitHub Issues.

Projects

Selected publicly visible projects; proprietary and unpublished company work is excluded.

SiphonPro Plumbing

Web App

Sole Developer (Freelance)

June 2026 - Present

Developing a full-stack SaaS platform connecting customers with plumbing and siphoning service providers, covering service requests, provider assignment, scheduling, status tracking, and subscription payments via Stripe (test mode).

Next.js, Supabase, Tailwind CSS, shadcn/ui, Stripe, Vercel

ComoEsta

Mobile App

Collaborator / Dev

December 2025 - Present

Collaborated on a Flutter-based mobile app that provides loan collection services for small businesses.

Flutter, Android, iOS, Firebase

House of Heroes

Web App

Sole Developer (Freelance)

January 2026 - March 2026

Built a social platform for a school community to digitize manual house-system processes and improve quality of life.

Next.js, Supabase, Tailwind CSS, Vercel

Lost Harmonia

Mobile Game + Web App

Leader / Developer / Docs

April 2025 - November 2025

Built a Unity-based 3D Android educational game with music theory puzzles and a companion Next.js platform for secure teacher-student management.

Unity, Next.js, Android, Vercel, Firebase

AutoFixin

Mobile App

Leader / Dev

February 2025 - May 2025

Built a mobile platform connecting vehicle owners with nearby automotive repair shops using geolocation, OpenStreetMap navigation, and Firebase-managed authentication.

Flutter, Android, Firebase

CurtainSlide

Mobile App + IoT

Leader / Sole Dev

October 2024 - December 2024

Developed a Flutter + ESP32 app that controls motorized curtains over Wi-Fi with background task scheduling and real-time synchronization.

Flutter, ESP32, Android, Firebase

Library Management System

Desktop App

Sole Dev

December 2023 - February 2024

A school project built using Java Swing for library management with MySQL database integration, supporting book inventory management and borrowing transactions.

Java, Swing, MySQL

Tech Stack

Languages

JavaScriptTypeScriptDartC#JavaPythonSQL

Frontend / App

ReactNext.jsFlutterTailwind CSSshadcn/uiAndroid

Backend / Data

Node.jsExpress.jsREST APIsPostgreSQLMySQLFirebaseSupabasePrisma ORM

DevOps & Infrastructure

DockerDocker ComposeGitHub ActionsCI/CDLinuxUbuntu ServerProxmox VESSHDigitalOcean

Security

TrivyLynisSemgrepContainer SecurityVulnerability Scanning

Tools & Platforms

GitGitHubVercelFirebase HostingAndroid StudioVS CodeOpenCode

Send a Message

Use the form below to contact me directly via email.