Alfredo S. Diomangay, Jr.

Full Stack Web Developer

Seasoned full stack web developer with extensive experience in building robust, scalable, and secure web applications from front to back. Skilled in modern frameworks like Next.js with Tailwind and TypeScript on the frontend, and powerful backend solutions using Node.js, AdonisJS, and Express.

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I'm a passionate Full Stack Web Developer with 6+ years of experience building scalable, user-centric applications. I specialize in React, Node.js, and PostgreSQL, with a strong foundation in performance optimization, RESTful APIs, and DevOps. I also have basic knowledge of GraphQL, NestJS, Angular, and MongoDB, allowing me to adapt quickly to modern tech stacks and contribute across the full development lifecycle.

My journey in web development started with a curiosity for creating interactive experiences that solve real-world problems. I believe in writing clean, maintainable code and staying up-to-date with the latest technologies and best practices.

What I bring to the table:

  • • Problem-solving mindset with attention to detail
  • • Team collaboration and mentoring experience
  • • Performance optimization and scalability focus
  • • User experience centered development approach

Senior Software Engineer - Freshclinics

December – July 2025

  • Developed and launched a new feature that increased user engagement by 20%, based on key user interaction metrics
  • Optimized the existing codebase, resulting in a 30% reduction in load times and improved overall performance
  • Participated in the successful migration of data from legacy systems to a modern, scalable architecture
  • Designed and implemented a robust POS system to enable fast transactions and efficient inventory management
  • Collaborated with cross-functional teams (including designers, QA, and product managers) to deliver high-quality, maintainable software solutions
  • Contributed to the frontend migration from Vue.js to React.js, improving code maintainability and developer experience
  • Created and maintained a library of reusable UI components, significantly accelerating development cycles and ensuring consistency across the application
React.js Next.js Node.js Express.js AdonisJS MongoDB GraphQL PostgreSQL TypeScript Tailwind CSS Shadcn UI Stripe

Backend Developer - Qonvex

September – November 2022

  • Redesigned the user interface, leading to a 25% increase in user satisfaction, as measured by user feedback and analytics
  • Worked closely with front-end developers to seamlessly integrate RESTful APIs, ensuring reliable and scalable data exchange
  • Implemented server-side rendering (SSR) to significantly improve page load times and SEO performance
  • Led a team of 3 developers in delivering a high-impact project ahead of schedule, while maintaining code quality and performance standards
  • Mentored junior developers, fostering skill growth and contributing to an overall increase in team productivity and code quality
Vue.js PHP Laravel MySQL JavaScript HTML CSS

Portfolio Website

Tech: Angular Tailwind CSS TypeScript

A responsive, single-page portfolio website built with Angular 18 and Tailwind CSS, designed to professionally showcase my work experience, technical skills, and development projects — including this portfolio itself. The site includes features such as a downloadable CV, categorized project listings, a detailed work history section, a skills overview (with both current technologies and future learning goals like Kubernetes), and social media links for easy networking. With a focus on UI/UX best practices, the design is optimized for mobile and desktop, using Tailwind’s utility-first styling and Angular’s component architecture to ensure performance, accessibility, and clarity.

Code

Admin Panel Platform

Tech: React NextJS PostgreSQL Tailwind CSS Shadcn UI NestJS

Built a full-stack e-commerce platform with an integrated admin dashboard for managing products, users, orders, and real-time sales analytics using modern frameworks and best practices

URL Collections Management System

Tech: NextJS TypeScript Shadcn UI PostgreSQL Prisma JWT Tailwind CSS Nodemailer Zustand Zod

A fullstack web application that lets users save and categorize external links for easy access, with email verification for security and rich profile customization. LinkCollect is a secure link bookmarking tool for organizing and categorizing external URLs. Users can register, verify their email. Each account includes a dashboard summarizing their saved links, categories, and profile data — optimized for both desktop and mobile.

Code

Sales Management System

Tech: NextJS Shadcn UI PostgreSQL Tailwind CSS

A mobile-first web application built with Next.js and Tailwind CSS to efficiently manage sales, customers, purchases, and stock inventory. The app includes a real-time sales summary report, secure user authentication, and is fully deployed on Vercel with a PostgreSQL database. Designed for speed, responsiveness, and real-world usability, this project demonstrates fullstack development skills and practical business logic implementation.

Code

Horse Racing System

Tech: Vue.js Tailwind CSS TypeScript PHP Laravel Stripe MySQL

A cloud-hosted SaaS application designed for horse racing enthusiasts to track live race schedules, results, and get real-time updates on specific horses. The platform offers a subscription model where paid users unlock advanced features like instant updates, push notifications, and horse tracking, even when the app is running in the background. Engineered for performance, scalability, and user engagement, the platform is ideal for both casual fans and serious bettors looking for immediate, reliable race information.

Currently Learning

  • Kubernetes & CI/CD with GitHub Actions
  • AWS Services (S3, EC2, RDS)
  • AI integration via OpenAI APIs
  • NestJS
  • Angular
  • GraphQL
  • RSC-first depevelopment
  • Microservices architecture
  • React Native