Crafted Personal Experience
Software Engineer | Full-Stack Developer | Cloud Architect | Open Source Contributor
Built for those who create, not just those who code.
Full-stack software engineer with 8+ years of experience designing and shipping production-grade web applications, microservices, and cloud-native platforms. I specialize in building scalable, maintainable systems using modern JavaScript/TypeScript stacks, with a strong focus on developer experience, CI/CD automation, and infrastructure as code. Trusted by startups and enterprises alike to deliver high-quality software on time.
Beyond my core engineering work, I actively contribute to open-source projects and participate in the developer community through conference talks, technical writing, and mentoring. My interests span distributed systems, edge computing, and the intersection of AI with software development tooling. I believe in shipping pragmatic solutions that solve real problems while maintaining clean, testable code.
My PRO journey and career highlights
Leading frontend architecture for the developer dashboard team. Responsible for designing scalable component systems, improving developer experience, and shipping high-impact features used by millions of businesses worldwide.
- Architected and shipped a new React-based dashboard that reduced page load times by 40% and improved developer satisfaction scores by 25%.
- Led migration from legacy jQuery codebase to modern React/TypeScript stack across 50+ pages, establishing patterns adopted by 8 other teams.
- Built a real-time webhook debugger with WebSocket streaming, enabling developers to diagnose integration issues 3x faster.
- Mentored 4 junior engineers through structured 1-on-1s and code review sessions, with 2 promoted within 18 months.
Core contributor to Next.js framework and Vercel platform. Worked on server-side rendering, edge functions, and deployment infrastructure serving billions of requests monthly.
- Contributed to Next.js core, implementing ISR (Incremental Static Regeneration) features that became one of the most-used framework capabilities.
- Built the initial version of Edge Functions runtime, enabling serverless compute at 30+ global locations with sub-10ms cold starts.
- Designed and implemented the project analytics dashboard processing 500M+ data points daily with real-time visualization.
- Authored official documentation and tutorials that became the primary learning resource for 100K+ developers.
Worked on the Pull Requests and Code Review team, building features that improved collaboration for 80M+ developers. Focused on performance optimization and accessibility improvements.
- Shipped the redesigned Pull Request review experience with inline commenting, reducing review cycle time by 35% based on user studies.
- Optimized diff rendering performance for large PRs (10K+ lines), achieving 60% reduction in initial render time through virtualization.
- Implemented keyboard navigation and screen reader support across the code review interface, meeting WCAG 2.1 AA standards.
- Led the adoption of React Testing Library across the team, increasing test coverage from 45% to 85%.
Worked on the storefront rendering engine team, optimizing Liquid template compilation and implementing responsive design patterns for merchant themes.
- Improved Liquid template rendering performance by 30% through caching optimizations and lazy evaluation techniques.
- Built a responsive preview tool allowing merchants to test their storefront across devices directly in the admin dashboard.
- Contributed to the Polaris design system, creating 12 reusable React components adopted across 5 internal teams.
Selected work and side-B projects
Hackathon - Autonomous Construction Robotics Platform
Empower facilities to perform autonomous material transport, optimize workflows, and enhance productivity with our intelligent robot fleet management system—delivering measurable results from planning to execution.
Hackathon - Agentic AI for Data Indexing Platform
Arcanum orchestrates intelligent CCTP data‑indexing (USDC-EURC) decisions across 13+ blockchain networks, providing fast access to onchain events and state‑data monitoring
Private Generator for Short URL Links
Personalize private short url links. Make it easy to share. Manage dashboard analytics. Add your retargeting custom shorted from multiple platforms.
Private Object Storage with Cloudflare R2
Craft your personalized cloud storage buckets, forging a realm of effortless file management and securely by Cloudflare R2 & compatibility with Amazon S3.
Enterprise Payment Gateway Redesign
Led the complete frontend redesign of a payment gateway processing $2B+ annually. Modernized the merchant dashboard with real-time analytics, improved checkout conversion by 18%.
Stripe — San Francisco, CA
Edge Runtime Infrastructure
Designed and built the runtime infrastructure for deploying serverless functions at the edge across 30+ global locations, achieving sub-10ms cold start times.
Vercel — Fulltime
Crafted Personal Experience Portfolio
Personal portfolio built to showcase projects, skills, and professional background. Features responsive design, project filtering, and dedicated sections for portfolio, about, and contact information.
Private Generator for Two-Factor Authentication
Secure and private 2FA code generator. Generate Two-Factor Authentication codes instantly in your browser with no server storage and no tracking for complete privacy. A self-hosted solution for maximum security—just pure cryptographic protection for your accounts.
Continuous learning and professional development
AWS Solutions Architect — Professional
Demonstrated advanced knowledge of designing distributed systems on AWS, including multi-account strategies, cost optimization, and high-availability architectures.
Google Cloud Professional Data Engineer
Certified in designing and building data processing systems on Google Cloud, including BigQuery, Dataflow, and Pub/Sub for real-time analytics pipelines.
GitHub Actions & Advanced CI/CD
Certified in building advanced CI/CD pipelines with GitHub Actions, including matrix builds, reusable workflows, container deployment, and security scanning.
Project Management Professional (PMP)®
Demonstrated advanced project management expertise, including predictive, agile, and hybrid approaches to lead cross-functional teams and deliver global initiatives.
Microsoft Certified: Azure Solutions Architect Expert
Validated expertise in designing cloud and hybrid solutions that run on Microsoft Azure, including compute, network, storage, monitoring, and security.
Certified Information Systems Security Professional (CISSP)
Demonstrated expertise in designing, implementing, and managing best-in-class cybersecurity programs. Covered domains including Security and Risk Management, Asset Security, and Network Security.
Certified ScrumMaster (CSM)®
Validated mastery of the Scrum framework and agile principles. Capable of facilitating team collaboration, removing impediments, and ensuring high-performance product delivery.
TOGAF® 9 Certified
Certified in the TOGAF enterprise architecture framework. Skilled in bridging the gap between business strategy and IT infrastructure through structured architecture development methods.
Have a project in mind? Let's work together.
ASIA, SEA - ID
"Let's build something amazing together. I'm always open to exciting collaborations and new challenges."
— johnkey