I'm a full stack developer from Kabacan, Cotabato. For the past 3 years, I've helped businesses and organizations turn their ideas into simple, reliable websites, mobile apps, and everyday business tools.
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Years of experience
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Projects completed
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Tools & technologies
Errold Jay Batay-an
Full Stack Developer
Things I can build for you
My TechStack
From frontend interfaces to backend systems and deployment — the technologies I use to build complete, production-ready applications.
Building responsive, accessible interfaces with modern frameworks, type safety, and clean component architecture.
Designing REST APIs, authentication, and business logic with a focus on clean architecture and maintainability.
Developing cross-platform mobile apps for Android and iOS with native-feeling performance and smooth UX.
Modeling relational and document data, writing efficient queries, and keeping data consistent and reliable.
Containerizing apps, setting up CI/CD pipelines, and deploying to the cloud for fast, reliable releases.
Collaborating with version control, design handoff, and agile practices to ship features efficiently.
My Work
Real things I've built for real people — from online stores and mobile apps to systems that run schools and offices.
A complete system that helps a company keep employee records, post job openings, and handle everyday HR tasks in one place. Managers and staff each get their own easy-to-use dashboard.
A cashless payment system for school canteens. Students pay for food with a tap of their ID card instead of cash, parents can view their child's transactions, and the school sees every transaction live.
A music and arts app where people can create, share, and discover audio content — a bit like TikTok meets Spotify.
A complete online shop with products, a cart, secure checkout, and order tracking — plus a simple admin page for managing stock.
Private and group messaging with photo sharing and instant notifications — messages arrive the moment they're sent.
Helps a church keep track of members, ministries, events, and announcements — with different access for admins and leaders.
Tracks stock levels, suppliers, and purchase orders for a warehouse — and sends an alert before anything runs out.
Customers book, move, or cancel appointments online. The staff sees everything on a calendar, and emails go out automatically.
Helps a barangay office manage resident records, certificate requests, and announcements — all digital instead of paper.
Lets students enroll online — choose subjects, pay fees, and view grades — without lining up at the registrar.
A cashier system for retail stores with barcode scanning, receipts, and daily sales reports the owner can actually read.
A job board where companies post openings and applicants upload resumes and apply — with email updates along the way.
Log workouts, calories, and daily goals on your phone — with reminders and progress charts that keep you motivated.
Browse restaurants, order food, and watch your delivery move on the map in real time.
Find local events, RSVP with one tap, and chat with other people going — all from your phone.
…and a few more I can show you when we talk.
Contact
Tell me a little about what you need, and I'll get back to you within a day. No tech knowledge required — just describe your idea in your own words.
Quick replies
I respond to every message within 24 hours.
Based in Kabacan, Cotabato
Happy to work with clients anywhere in the world.
Prefer plain email?
erroldjayb@gmail.com