Published package
fastmail-masked-email
A typed Node.js client for creating, updating, filtering, and deleting Fastmail masked email addresses through JMAP.
01 / About
Building systems with a long view.
Backend engineering, open-source work, and continued study in computing systems.
I’m Andrew Leonard, a software engineer focused on designing and building scalable, reliable backend systems. At Ally Financial, I work on serverless APIs in AWS; alongside that work, I’m pursuing Georgia Tech’s online Master of Science in Computer Science with a computing systems specialization.
Open source is where I keep learning in public. I build tools such as fastmail-masked-email and Masked Email Manager, and I value projects whose interfaces and operational behavior stay understandable as they grow.
Away from the computer, I’m usually at the gym, gaming, or spending time with my two dogs.
02 / Projects
Browser extension
Masked Email Manager
A Chrome and Firefox extension for searching, creating, editing, favoriting, and deleting Fastmail masked email addresses.
03 / Experience
View resume (PDF)–Present
Principal Software Engineer / Technical Lead
Ally Financial / Remote
- Set technical direction for business-critical authentication APIs while mentoring and onboarding junior and mid-level engineers
- Architected and delivered highly available, multi-region AWS infrastructure for production AI and customer authentication services
- Led large-scale architectural migrations, including transitioning high-traffic APIs to Kong Enterprise Gateway with zero downtime
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Senior Software Engineer
Ally Financial / Remote
- Developed resilient, low-latency Node.js APIs for the core customer login journey, backed by event-driven data flows
- Architected fault-tolerant, multi-region database and API infrastructures using Terraform to ensure high availability and automated disaster recovery
- Optimized developer productivity by overhauling CI/CD pipelines, reducing build times by 98% and accelerating feature delivery
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Senior Software Engineer
MITRE Corporation / Eatontown, NJ
- Orchestrated containerized ELK clusters on AWS using Docker and Kubernetes for high-volume data ingestion and analysis
- Developed Python REST APIs for configuring and tuning high-performance Software Defined Radios
- Designed and built full-stack video communication web applications using WebRTC
Education
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Master of Science in Computer Science
Georgia Institute of Technology / Atlanta, GA
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Bachelor of Science in Computer Science
Rutgers University / New Brunswick, NJ
04 / Notes
Recent Notes
Reading the boundary
A short note on making a service boundary observable before it becomes difficult to debug.