# Hadley Callaway

> Chief of Staff at Sazabi | Prev. Software Engineer at Doppel, Brex, Microsoft

Location: San Francisco, California, United States
Profile: https://flows.cv/hadley

## Work Experience
### Chief of Staff @ Sazabi
Jan 2026 – Present | San Francisco, California, United States
Founding employee #5. First commercial hire. Still shipping product changes.

The AI-native observability platform for fast-moving engineering teams. Backed by tastemakers from the world's top AI companies: Vercel, Graphite, Daytona, Browserbase, LangChain, Mastra, Replit, and more.

### Senior Software Engineer @ Doppel
Jan 2024 – Jan 2026 | New York, New York, United States
Employee ~60, engineer #16, and the first woman engineer hired beyond the founding team.

Built AI/ML systems to detect and dismantle phishing attacks across the internet. Led our product focused on identifying high-profile impersonations. Personally recruited 5 engineers.

### Senior Software Engineer (Bill Pay & Procurement Product) @ Brex
Jan 2024 – Jan 2024 | New York, New York, United States
Led a team of 5 engineers to design and launch a secure vendor payments portal, enabling self-service onboarding into the Brex payment ecosystem.

### Software Engineer II (Banking Infrastructure) @ Brex
Jan 2022 – Jan 2024 | New York, New York, United States
Owned the FDIC sweep product that allocates customer funds across a partner-bank network. In March 2023 we onboarded 4K former Silicon Valley Bank customers, more than doubling our deposits.

### Software Engineer I (Banking Infrastructure) @ Brex
Jan 2021 – Jan 2022 | New York, New York, United States
Built internal tooling to help Accounting manage and reconcile customer funds. Won 1st place in the company-wide hackathon.

### Software Engineer @ National Institutes of Health
Jan 2020 – Jan 2020 | Bethesda, Maryland, United States
Modernized collaborative research by leading customer research and adoption strategy for GitHub Enterprise Cloud across 11 NIH institutes.

### Software Engineer @ Microsoft
Jan 2020 – Jan 2020 | Redmond, Washington, United States
Contributed to post-acquisition integration of GitHub into Visual Studio by embedding GitHub template repositories into the project creation workflow.

### Software Engineer @ Microsoft
Jan 2019 – Jan 2019 | Redmond, Washington, United States
Built a web application to extend the platform reach of an AI-curated mobile news feed.


## Education
### Master of Business Administration - MBA
Harvard Business School

### Bachelor's degree in Computer Science
Columbia University

### Groton School


## Contact & Social
- LinkedIn: https://linkedin.com/in/hadley-callaway

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Source: https://flows.cv/hadley
JSON Resume: https://flows.cv/hadley/resume.json
Last updated: 2026-03-20