Hi, I'm JOHN
A decade of shipping production systems.
I'm a full-stack software engineer with 10+ years of experience building scalable web, mobile, and AI-powered applications - from small platforms to enterprise systems.
I'm John Alcantara.
A quick hello in 7 seconds.
Tap the speaker icon to hear me out — or just scroll on. Either way, I've spent the last decade turning complex problems into products people actually enjoy using.
SaaS & Web Platforms
Built scalable web applications with complex workflows, user management, and production-ready architectures.
AI-Enabled Systems
Integrated AI services for real-time processing, structured outputs, and intelligent user experiences.
Frontend Engineering
Developed modern, component-driven interfaces with focus on performance, usability, and maintainability.
Real-time Applications
Engineered systems with live updates, streaming data, and responsive user interactions.
Scalable Architecture
Designed modular systems using microservices, shared modules, and scalable infrastructure patterns.
Reliability & Security
Built production-ready systems with strong data handling, access control, and robust testing practices.
A stack tuned for speed & scale.
I pick the right tool for the job - from real-time systems to AI-first products.
Front-End
11 itemsBackend
12 itemsDatabase
6 itemsCloud & DevOps
7 itemsSome of my projects.
Enterprise kiosks, interactive retail walls, and consumer platforms across PLDT, Smart, Yamaha, and the Villar Group.
A 12-year timeline.
From enterprise to startup, I've led and shipped across the stack.
Software Engineer
- — Designed and developed scalable healthcare platforms at Oqea Pty Ltd, including telehealth systems, diagnostic tools, and practice management solutions used in real-world clinical workflows.
- — Implemented microservices using modern stacks, leveraging monorepo setups, module federation, and cloud-native services for performance and scalability.
- — Built advanced features such as real-time video consultations, live transcription with AI-powered summaries, and complex reporting pipelines integrating multiple data sources.
Web/Mobile Developer
- — Delivered end-to-end freelance solutions for enterprise clients including Yamaha Motor Philippines, Lumina Homes, Villar Group, etc. building custom systems tailored to business needs.
Full Stack Developer
- — Customized and extended the CRM platform Perfex CRM at Ad-Lib.io, enhancing core modules such as client management, sales pipelines, and reporting to support business-specific workflows.
- — Developed full-stack features using PHP, JavaScript, and MySQL, including custom modules, API integrations, and UI improvements to streamline internal operations and improve user experience.
- — Optimized system performance and maintainability by refactoring legacy code, improving database queries, and implementing scalable solutions aligned with evolving CRM requirements.
Full Stack Developer
- — Developed interactive kiosk systems at Optima Digital, including PLDT InfoTouch and Smart Product Wall, delivering engaging digital experiences for telecom and retail environments.
- — Built and maintained multiple full-stack web applications and marketing websites using PHP, JavaScript, and MySQL, supporting both internal tools and client-facing platforms.
- — Engineered experiential marketing solutions by integrating hardware (touchscreens, kiosks) with custom software, enabling immersive and data-driven customer interactions across events and physical locations.
Let's build something immersive and thoughtfully crafted.
Open to full-stack, architecture, and AI-heavy product roles.