Zachary Iguelmamene
Software Engineer @American Express
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WORK HISTORY
Software Engineer @American Express
Owned end-to-end delivery of multiple identity and authentication microservices (Trusted Device, Smart Identity Profile, One Time Authentication Code, Personal Security Key, User Identifier Suggestion, Account Reset Notification), including authoring design documents, driving production readiness reviews, and leading implementation. Modernized legacy systems and enabled secure access for 10+ million global customer accounts- Engineered next-generation security and identity APIs with Java and Spring Boot, sustaining TPS under peak loads with 99.99% availability. Reduced latency by 40% compared to legacy services- Developed comprehensive performance and regression test suites using JMeter and Postman, validating throughput at 3–5× expected peak traffic to ensure stability and resilience for customer-facing services- Optimized backend efficiency by eliminating millions of redundant network calls per month and reducing CPU utilization by 15%, lowering infrastructure costs while improving reliability at scale- Resolved critical production incidents in customer authentication services, restoring availability within SLA and minimizing customer impact. Authored post-incident documentation and monitoring improvements to reduce recurrence- Provided technical leadership and mentorship by onboarding interns and new engineers, leading training sessions, and guiding contributions that shipped to production- Championed engineering culture and collaboration by leading production readiness reviews, knowledge-sharing sessions, and cross-team initiatives across 5+ partner teams, improving development velocity and code quality.
EDUCATION
University of California, Los Angeles
Bachelor of Arts
ABOUT ZACHARY IGUELMAMENE
Experienced, driven, and motivated software engineer with a demonstrated history of…
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