Building an Offline-First QR Check-In System
How I built a production-ready QR code check-in system using Cloudflare Workflows, offline-first iOS architecture, and smart merge protection to handle event check-ins without network connectivity.
Hey, I'm Devin 👋🏼
I'm a product builder and full stack developer. I'm a big proponent of building resilient and reliable workflows and systems. I'm currently working at 🌐 Cubic Digital Intelligence, building GEOINT tools to help the Warfighter.
By day, I've built everything from scalable image processing pipelines, to advanced edge computing platforms. By night, my entrepreneurial spirit drives me to create side projects that solve real-world problems. I'm currently helping build 🅿️romoted - a nightlife platform for building out your ambassador program, and an iOS app to help promoters build their guest list, and venues to check-in guests at the door; and 🍂 Vendora - a marketplace for connecting vendors to event organizers.
I share my projects and my learnings on this blog.
Writing
Monitoring GolfNow Tee Times with Temporal.io
Building a resilient tee time monitoring system with Temporal workflows, multi-tenant database design, and automated notifications to catch last-minute golf course cancellations in competitive North Jersey markets.
Deploying Temporal with Podman Quadlets
A hands-on guide to deploying Temporal workflow orchestration using Podman Quadlets and systemd on Linux, covering multi-container setup, networking, SSL configuration, and production-ready security practices for edge and high-security environments.
Building an Email Drip Campaign with Temporal.io
Learn how to build a reliable, production-ready email drip campaign using Temporal.io for workflow orchestration, Spring Boot, and AWS SES—with automatic retries, durability, and clear workflow-as-code design.
Projects
Promoted
Nightlife's essential service to manage their promoter program, provide loyalty rewards, and drive more business
GolfNow Tee Time Monitor
Monitor tee time openings with Temporal workflows
Table On Us
Automated Restaurant Reservations in NYC
Temporal with Podman Quadlets
Deploy Temporal with Podman Quadlets