# William Callahan

> Senior Cloud Software Engineer | DevSecOps Professional

Location: Bethel, Connecticut, United States
Profile: https://flows.cv/williamcallahan

Cloud Software Engineer with ten years of experience designing and implementing scalable, high-performance multi-cloud architectures. Proven ability to lead technical teams to deliver mission-critical solutions of complex applications while improving security and reducing costs.

## Work Experience
### Software Engineer @ 908 Devices
Jan 2025 – Present | Danbury, Connecticut, United States

### Senior Software Engineer @ ThorTech Solutions
Jan 2018 – Jan 2025 | White Plains, NY
• Led software engineering teams of four in health, media, and public sectors on designing and implementing multi-cloud solutions, ensuring security, durability, and scalability
• Optimized live election API performance, ensuring consistent sub-200ms latency while querying large dynamic datasets handling over 10-million daily global requests
• Reduced batch execution times by 90%, accelerating time to market from hours to 
minutes for multiple clients utilizing diverse databases
•  Redesigned US election survey weighting platform, improving model accuracy and 
accelerating live election publishing to achieve accurate election forecasts
• Reimagined CI/CD pipeline to reduce build times by 44%, cost by 29%, and SCM 
vulnerabilities by 52%
• Architected distributed systems using AWS Lambda, ElastiCache, RDS, MSK, ECS, Kinesis, ELB, SQS, EC2, Elastic Beanstalk, SSM, OpenSearch, and VPCs
•  Reduced cloud OpEx by 19% across four clients, saving over $127,000 per year

### Squad Leader, SSG @ Army National Guard
Jan 2013 – Jan 2022 | Danbury Connecticut
• Led an eight-soldier infantry squad, providing training, direction, and development 
for a successful deployment in support of Operation Enduring Freedom (OEF)
• Executed joint military missions among CJTF-HOA, successfully strengthening 
international relationships for the first time in 20 years

### Software Engineer @ United Nations Office for Disarmament Affairs
Jan 2016 – Jan 2017 | New York, NY
• Collaborated with multi-national stakeholders to gather application requirements for a multi-lingual dynamic forms application using Django, React, and MySQL
•  Designed and implemented a scalable architecture to support global efforts in 
tracking illicit firearms trade to award multi-million dollar aid packages to over 75 
member countries

### Software Engineer Team Lead @ Western Connecticut State University
Jan 2015 – Jan 2017 | Western Connecticut State University
• Mentored fellow engineers in the first student-led university software engineering 
team using Angular, Java EE, Spring, Oracle, MSAD, and JBoss
• Digitized university operations paperwork and timekeeping, saving over 30 
employees one hour each daily


## Education
### Bachelor of Science - BS in Major: Computer Science, Minor: Security
Western Connecticut State University


## Contact & Social
- LinkedIn: https://linkedin.com/in/william-callahan
- Portfolio: http://callahanwilliam.com/

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Source: https://flows.cv/williamcallahan
JSON Resume: https://flows.cv/williamcallahan/resume.json
Last updated: 2026-04-13