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Ivanjo Sarmiento

@ivanjosarmiento

Senior Full Stack PHP Developer at Flexilabs, building Rex Software features and AI-agent workflows for software delivery.

Philippines

Message

At Flexilabs, I build and maintain full-stack features for Rex Software, including payment-related solutions across card-present and card-not-present workflows. I also design and maintain high-availability services in a cloud-based engineering environment.

I designed an AI-assisted engineering orchestration workflow using Claude Code, reusable skills, and specialized sub-agents. It supports ticket implementation, gated PR reviews, reviewer-comment resolution, CI and build-failure investigation, and other development workflows, with human control over architectural and production decisions.

Earlier, I built a Vue.js and Laravel gym management application at PersonalPT with multi-tenancy and Stripe and PayPal integrations. Across roles at RedHQ, Etsyrank, Kats Software, AR BPO Services, and Nextvation Software Solutions, I worked on real estate applications, APIs, payment systems, and web platforms.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack PHP Developer

Current

Flexilabs

Feb 2025 - Present (1 year 8 months)

Build and maintain full-stack features for Rex Software products using PHP/Laravel, TypeScript/React, APIs, and modern web application practices. Contribute to payment-related solutions and design high-availability services in a cloud-based environment.

PHP Laravel TypeScript React APIs Cloud Computing Claude Code AI Assisted Engineering Orchestration Testing CI CD

Full Stack Developer

RedHQ

Mar 2020 - Aug 2024 (4 years 5 months)

Maintained and enhanced real estate web applications, improving backend workflows, UI/UX, integrations, and platform reliability. Designed and implemented RESTful APIs and integrated third-party APIs.

REST APIs Third Party Integrations Database Optimization Refactoring Unit Testing

Full Stack Developer

PersonalPT

Jul 2019 - Mar 2020 (8 months)

Built a single-page gym management application using Vue.js, Vuex, Sass, and Laravel APIs. Integrated Stripe and PayPal APIs for subscription and payment transactions.

Vue.Js Vuex SASS Laravel Stripe PayPal Multi tenancy Database Design

Backend Developer

Etsyrank

Feb 2018 - Jul 2019 (1 year 5 months)

Joined as the first developer in a rebuild project, migrating a legacy codebase to Laravel and improving maintainability and scalability. Built RESTful APIs and backend services supporting a Vue.js single-page application.

Laravel REST APIs Vue.Js Legacy Migration Backend Services

Full Stack Developer

Kats Software

Jul 2017 - Mar 2018 (8 months)

Developed modules for a custom payment gateway, including virtual payment and user management features. Designed and managed MySQL structures for payment and administration workflows.

Payment Gateways MySQL WooCommerce PHP Production Deployment

Web Developer

AR BPO Services

Apr 2016 - Jul 2017 (1 year 3 months)

Guided developers, gathered client requirements, and developed internal and client-facing websites. Built responsive websites using HTML, CSS, JavaScript, and WordPress, and maintained an internal PHP payroll system.

HTML CSS JavaScript WordPress PHP Responsive Design

Web Developer

Nextvation Software Solutions

Oct 2015 - Apr 2016 (6 months)

Maintained e-commerce websites built with Exponent CMS and developed responsive frontend features using XHTML, CSS, and JavaScript. Maintained a CRM system, added features, fixed bugs, integrated BlueSnap payments, and created RESTful APIs.

Exponent CMS XHTML CSS JavaScript CRM BlueSnap REST APIs