William Callahan
Software Engineer at 908 Devices
Bethel, Connecticut, United States
Summary
👤
Senior🎓
Top SchoolWilliam Callahan is a cloud software engineer with nine years of hands-on experience designing and delivering high-performance, multi-cloud architectures and cost-optimized distributed systems. He has led engineering teams across public, health, and media sectors to produce mission-critical solutions—optimizing APIs to sub-200ms latency at 10M daily requests and cutting batch times by 90%—while reducing cloud OpEx and CI/CD costs. His background spans AWS serverless and streaming technologies (Lambda, MSK, Kinesis), container platforms, and resilient data stores, and he has applied that expertise to election forecasting, global UN disarmament tracking, and university systems. A former Army National Guard squad leader, he brings disciplined leadership, cross-cultural collaboration experience, and an operational mindset to engineering challenges. Based in Bethel, CT, he currently builds cloud products at 908 Devices and consistently balances security, scalability, and cost-efficiency in production systems.
9 years of coding experience
10 years of employment as a software developer
Bachelor of Science - BS Major: Computer Science Minor: Security, Bachelor of Science - BS Major: Computer Science Minor: Security at Western Connecticut State University
English
Github Skills (39)
aws-lambda6
django-project6
authlib5
aws-ecs5
aws5
sublime5
django-framework5
django5
simplify5
aws-services4
lambda-functions4
json4
lambda4
csharp4
validation4
Programming languages (6)
Github contributions (5)
WillCallahan/portfolio
Dec 2017 - Feb 2025
Portfolio Web Application for William Callahan
Contributions:29 PRs, 50 pushes, 4 branches in 7 years 2 months
mysqlphpweb-applicationweb-portfoliocomposer
tecconn/colorblind-pal
Sep 2017 - Jan 2025
Contributions:1 release, 13 pushes, 2 branches in 7 years 6 months
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