Alexandra Heartsfield
Staff Security Engineer at Mozilla
Fort Worth, Texas, United States
Summary
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Rockstar🎓
Top SchoolAlexandra Heartsfield is a Staff Security Engineer based in Fort Worth, Texas with 18 years of experience securing complex systems across aviation, consulting, and consumer-focused organizations. Currently at Mozilla after consulting for Unit 42 and Zyston, she blends hands-on security engineering with program-level data governance and product security practices. Her background at Bell Flight spans hands-on SOC liaison work, vulnerability management, and driving enterprise data governance—skills she translates into pragmatic, auditable security controls. She also contributes backend engineering to open-source projects like a Nostr relay implementation, demonstrating expertise in WebSocket event parsing, signature validation, and embedded SQLite storage. Known for turning cross-functional requirements into operational programs, she pairs technical depth with a business-information systems mindset from Texas Christian University. Colleagues rely on her to bridge engineering, risk, and product teams to deliver secure, scalable outcomes.
18 years of coding experience
2 years of employment as a software developer
Bachelor of Business Administration (B.B.A.), Business Information Systems; Supply Chain Management, Bachelor of Business Administration (B.B.A.), Business Information Systems; Supply Chain Management at Texas Christian University
Github Skills (7)
nostr10
json10
rust10
websocket10
sqlite10
database-design10
cryptography9
Programming languages (13)
Github contributions (5)
scsibug/nostr-rs-relay
Nov 2021 - Jan 2023
Mirror of https://sr.ht/~gheartsfield/nostr-rs-relay/
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 reviews, 420 commits, 66 PRs in 1 year 2 months
Contributions summary:Alexandra primarily focused on implementing core back-end functionalities for a Nostr relay server. Their work involved parsing and validating events and subscription requests from WebSockets. They implemented robust validation procedures, including signature verification, and introduced mechanisms for event storage within an SQLite database. The user also designed and implemented functionalities for managing subscriptions and event filtering.
relayrustnostr-protocolnostrrelay-modern
scsibug/tarski_logic
Mar 2012 - Aug 2021
Solutions for Tarski's Introduction to Logic
Contributions:9 commits, 1 PR, 1 push in 9 years 7 months
code-golflogicrelational-algebra
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