Open to Software Developer and Full-Stack Developer Roles
Hi, I’m Valk.
Think deeply. Build deliberately.
I'm a Computer Engineering graduate who builds software with a systems-first mindset—turning complex workflows into simple, reliable solutions without compromising quality or efficiency.
Three applications, from Java fundamentals to full-stack workflows.
A multi-tenant equipment management system for tracking assets, checkout, returns, location transfers, maintenance, audits, and lifecycle history.
Role-based workspaces, CSV import and export, printable QR labels, and asset retirement with retained history.
Hand-coded original; AI-assisted interface redesign and later development, informed by user research.
Read the case studyPublic synthetic demo via sign-in
A client-origin service workspace connecting requests, dispatch, work orders, inventory, and billing across branches.
Technician scheduling, inspection records, invoicing, collections, receipts, and branch reporting.
Requirements, workflows, and data decisions; AI-assisted development and deployment.
Read the case studyPublic synthetic demo via sign-in
A banking simulator for practicing account and transfer workflows, with a Java desktop original and a separate web adaptation.
Account registration and sign-in, cash-in, transfers, and transaction history. Web v2 adds requests, fictional billers, savings goals, display-only cards, activity, and statement export.
Hand-coded desktop v1; AI-assisted redesign, development, and deployment of Web v2.
Read the case studyPublic synthetic demo · sign in with the sample account
I'm Valkenburgh Margin, also known as Valk, a Computer Engineering graduate from the Polytechnic University of the Philippines. I've completed Java programming training and have experience building Java applications, PERN-stack projects, and client websites.
I'm a builder who thinks in systems. I enjoy understanding problems, simplifying complex workflows, and finding efficient ways to build software without compromising quality.
I bring the same mindset to AI-assisted development. Beyond prompting, I build custom skills, automations, and structured workflows to improve how I work. I stay involved in planning, technical decisions, and reviewing results while continuously strengthening my skills as a software developer.
Languages, frameworks, and tools used across my projects and this portfolio.
Application logic, queries, and the web.
Java applications and server-side workflows.
Interfaces, styling, and interaction.
Relational models and database access.
Checks, dependencies, and production builds.
Version control, local environments, and hosting.
Tools used across my workflow for planning, development, and review. Tool use varies by project.
Browse a category for the complete inventory.
Learning & foundations
Engineering foundations, project experience, and continued learning.
Polytechnic University of the Philippines
This is where I developed the engineering mindset and skill set I bring to building software.
TESDA · Center for International Industries Competence Corp. (CIICC)
Completed training in programming fundamentals, core Java concepts, and object-oriented programming. Completion certificate awaits issuance.
AWS Training & Certification
Completed the AWS Cloud Quest learning course, not the AWS Certified Cloud Practitioner exam. View the original course completion document below.
Personal full-stack project
Built a React and Express learning application with JWT sign-in, personal task lists, task creation and deletion, and PostgreSQL persistence.
ERL AssetHub · Personal project
Hand-coded the original asset manager, then expanded equipment lifecycle workflows through AI-assisted redesign and development, informed by user research.
Client-origin project · Portfolio implementation
Defined requirements, workflows, and data decisions for branch-aware service requests, work orders, inventory, and billing, with AI-assisted development.
CASH-G · Desktop v1 and Web v2
Hand-coded the Java Swing and JDBC banking simulator, then adapted it to Spring Boot and Thymeleaf with AI-assisted redesign, development, and deployment.
Have a software developer role or a question about my work? I’d like to hear from you.
