Full-Stack Product Engineer
I build full-stack web applications, scalable APIs, and AI systems. I write clean TypeScript. I focus on fast delivery, good design, and stable software.
JED MATTHEW MAMOSTO
Full-Stack Product Engineer
Selected Software & Systems
Real-world client software, enterprise loan engines, 3-day conference tools, and startup MVPs.
CPU Retirement Office Loan Management System
Institutional financial records modernization and loan processing ecosystem built for Central Philippine University Retirement Office. Replaced decades of legacy paper records with a CPA-validated automated calculation engine.
Key Achievements & Architecture
- CPA-Backed Financial Formula Engine: Codified complex institutional loan amortization schedules and penalty deduction rules into validated pure TypeScript modules with automated test coverage.
- Legacy Spreadsheet Normalization Pipeline: Sanitized and migrated 15+ years of unstandardized financial spreadsheets into structured MongoDB collections with Prisma guarantees.
- Role-Based Access Control (RBAC): Implemented granular permissions separating loan officers, system administrators, and member inquiry workflows.
Nomad Escape ROI Calculator & Lead Funnel
Interactive corporate retreat ROI calculator engineered under extreme deadline pressure for Nomad Escape to capture high-value enterprise leads at Web Summit 2025 in Lisbon.
Captured live on-site at Web Summit Lisbon across international tech founders
Startrpack AI Packaging Platform
Dual-engine packaging consultancy and AI studio combining an Astro 5 marketing frontend with a Next.js 16 interactive compliance studio for Philippine food and cosmetic makers.
$150,000 USD preliminary commercial value unlocked upon initial launch
Paynoy Store Sales & Inventory System
Paynoy is a store sales and inventory system for small Filipino shops. It combines fast cash and QR checkout with nationwide GCash audio device delivery.
Paynoy sends customer money directly to merchant GCash accounts with zero fund holding.
Showcase Toolkit
Showcase helps developers and creators build a fast personal website and manage their career. It includes a private local folder to tailor resumes and write job introduction notes with AI.
Every feature passes automated test checks with zero errors
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Professional Background
3+ years of hands-on client software development, rapid MVP builds, and full-stack engineering.
Dedicated engineering contribution for remote product teams and high-growth ventures.
Deep async focus with daily written or video updates and flexible sync overlap for US, EU & AU.
Self-directed engineering & QA led by Jed; accelerated by Claude Code, Antigravity & Open Agent Engine.
Lead Full-Stack Engineer (Client Projects)
Oz TechLed technical execution for client web applications, deep GoHighLevel (GHL) API integrations & webhook pipelines, B2B conversion calculators (Nomad Escape), and open-source payment tools (WizPay).
Lead Web Engineer & Architect
CPU Retirement Office (Freelance System)Lead engineer for Central Philippine University’s loan management platform. Modeled CPA financial rules, designed UI/UX prototypes, and migrated decades of paper and Excel data into a MongoDB and Prisma web admin portal.
Founding Product Engineer
PackUp / Startrpack (Himo AI)Architected AI packaging label design automation (Startrpack) and sustainable group-buying demand aggregation algorithms for MSMEs. Won 1st Place in Tourism & Creative Tech at Visayas Startup Awards 2025.
DEVELOPER INFRASTRUCTURE & CORE STACK
0-to-1 MVP Velocity
Rapid execution from client requirements to deployed Next.js web applications.
Clean Production Code
Strict TypeScript typing, modular architecture, and zero technical bloat.
Direct Communication
Fluent client collaboration, clear status updates, and transparent commitments.
How I Build with AI Agents
I combine technical product leadership with multi-agent AI orchestration. Using Open Agent Engine, Claude Code, and Antigravity, I ship production software faster with verified quality.
Every build starts with human dialogue. I clarify business goals, map user journeys, and define strict constraints before writing code.
- Uncovering root business goals & user journeys
- Defining security, compliance & SLA requirements
- Establishing clear scope & acceptance criteria
I design data schemas, domain state models, and component hierarchies. Strict architecture guarantees modular code before agent execution.
- Designing typed database schemas & RLS policies
- Modeling domain business logic & financial algorithms
- Structuring task allocation matrices & API contracts
Using Open Agent Engine, Claude Code, and Antigravity, I orchestrate specialized domain subagents across isolated Git worktrees in parallel.
- Orchestrating parallel UX, frontend, backend & QA subagents
- Isolating file edits in temporary Git worktrees without collisions
- Loading specialized skill runbooks on demand with context caching
Every pull request undergoes automated unit tests, strict type checks, and human code review before release to production.
- Running automated unit, integration, and E2E test suites
- Auditing WCAG accessibility, input security & error states
- Deploying zero-downtime releases to Vercel with verified stability
Why Multi-Agent AI Engineering Delivers Higher Quality & Velocity
Jed personally architects every system, reviews code, and guarantees production stability.
Domain subagents build in isolated Git worktrees, eliminating code collisions and context bloat.
Every release passes automated verification suites, WCAG audits, and strict TypeScript checks.
Verified Track Record & Proof of Execution
Startup pitch awards, government-backed incubations, Google certifications, and international delegations: supported by verified external press releases and direct documents.
Bachelor of Science in Software Engineering
Central Philippine University (College of Engineering)
Senior software engineering coursework specializing in web application architecture, relational databases, and test-driven development.
Centralian Developer Group (CDG)
Central Philippine University
Spearheaded university developer community operations, orchestrating technical hackathons, coding workshops, and software engineering initiatives.
Google Developer Student Clubs (GDSC CPU)
Google Developers / CPU
Organized technical study jams, developer workshops, and campus hackathons in collaboration with Google Developer Groups.
Philippine Society of Software Engineers (PSSE)
CPU PSSE Chapter
Maintained engineering organization records, managed departmental operations, and coordinated creative design initiatives.
Rotaract Club of Central Iloilo City
Rotaract International / District 3850
Coordinated youth leadership programs, civic service projects, and community outreach across Western Visayas.
Visayas Startup Awards 2025 Winner
Visayas Startup Consortium / CPU
Validated B2B group-buying economics and product feasibility, winning 1st place in Tourism & Creative Tech and 2nd Runner-Up overall.
DICT PSC 8 Best Startup Pitch
Department of Information and Communications Technology (DICT)
Communicated technical architecture and commercial viability to executive judges, winning Best Startup Pitch and 2nd Place overall.
GrowthCon PH 2025 Top 5 Finalist
GrowthCon Philippines / Startup Live Pitching
Demonstrated startup unit economics and product scalability under live investor scrutiny, placing in the top 5 nationwide.
Anthropic: Introduction to Agent Skills
Anthropic Educational Academy
Architected specialized tool definitions, context-budgeted skill runbooks, and progressive disclosure protocols for autonomous LLM agents.
Anthropic: Claude Code in Action
Anthropic Educational Academy
Implemented terminal-driven AI engineering workflows, CLI automation, and test-driven agentic loops with Claude Code.
Google UX Design: Foundations of User Experience
Google / Coursera
Conducted foundational user research, created empathy maps, and built low-fidelity wireframes to minimize user cognitive load.
Google UX Design: Empathize, Define, & Ideate
Google / Coursera
Formulated clear problem statements, structured user personas, and executed iterative usability testing to validate product workflows.
DICT STEP UP Acceleration Program
DICT Philippines
Completed national startup acceleration curriculum focused on enterprise customer validation and rapid product iteration.
CPUGAD Tech Business Incubator
Central Philippine University
Incubated 0-to-1 software platforms, developing business models, MVP architectures, and institutional partnerships.
Western Visayas Student Startup Summit 2024 Speaker
UMWAD Western Visayas / DOST VI / CPUGAD TBI
Delivered keynote address on 0-to-1 product engineering and student entrepreneurship to regional university innovators.
DOST Antique iHub Resource Person
DOST Antique PSTO / Antique iHub
Conducted hands-on software development workshops and technical enablement sessions for provincial tech hubs.
DICT National ICT Month Guest Speaker
DICT Region VI
Presented on modern web software engineering and sustainable startup ecosystems for national ICT initiatives.
NTUE Taiwan Educational Immersion Delegate
National Taipei University of Education / CPU
Represented university in international academic immersion, collaborating across multicultural engineering and educational contexts.
Coastal Cleanup Environmental Leadership
Community / Environmental Advocacy
Coordinated volunteer teams for coastal environmental conservation and ecosystem protection.
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Looking for a full-time remote product engineer, scalable full-stack web applications, or dedicated 0-to-1 build sprints? Send a message directly below.
DIRECT DIRECTORY
Jed Matthew Mamosto
Full-Stack Product Engineer
0-to-1 Web & AI Systems