Charles McQuain

Senior Software Engineer and founder of AvailSim, an eSIM comparison platform helping international travelers find the best mobile data plans across 30+ countries and 15+ providers. With 6+ years of experience building scalable platforms, cloud infrastructure, and AI-driven products, I bring a technical lens to the travel connectivity space. AWS Certified Solutions Architect and frequent international traveler who got tired of overpaying for roaming — so I built the tool I wished existed. I personally test eSIM providers on my own trips and publish the results. I'm heading to Dublin in September 2026 to test providers firsthand across Ireland.