Sathesh Sivashanmugam
Sr. Cybersecurity Engineer II
Expert in Secure Systems & Scalable Architecture. Driving innovation at American Express.
01 — About
Engineering at the intersection of
security and scale.
I'm a Senior Cybersecurity Engineer with 17+ years of experience designing secure, scalable systems for the world's most demanding financial and consumer-tech platforms — from American Express to Apple Inc.
I thrive on the messy edges where security meets product velocity: encryption, cloud architecture, AI-system threat modeling, and the kind of pragmatic engineering that ships under real constraints.
Outside of shipping code, I judge international technology awards, publish research on AI security, and lead engineering teams with a Harvard-certified leadership lens.
02 — Experience
A 17-year career trajectory.
Sr. Cybersecurity Engineer II
Aug 2025 — Present- Drive cybersecurity engineering initiatives across mission-critical financial platforms.
- Apply 17+ years of systems and security expertise to safeguard scalable architecture.
Senior Software Engineer I
Jan 2019 — Aug 2025- Led scrum teams: hands-on coding, daily stand-ups, technical mentorship.
- Partnered with Engineering Directors and Product Owners on requirements and system design.
- Designed and shipped resilient services powering customer-facing financial products.
Software Engineer
Nov 2015 — Dec 2018- Revised, modularized, and modernized legacy codebases — reducing operating costs by 80%.
- Established modern development standards adopted across multiple teams.
Senior Software Engineer — Client: Apple Inc.
Apr 2013 — Nov 2015- Collaborated with cross-functional Apple teams to analyze and design system solutions to evolving requirements.
- Wrote production code and guided offshore engineers to deliver multiple concurrent projects.
Senior Software Engineer — Client: Apple Inc.
Dec 2009 — Apr 2013- Delivered Java and front-end enhancement projects for Apple Inc.
- Provided technical guidance, code review, and kept project deliverables on timeline.
Software Engineer — Client: MasterCard
Sep 2008 — Dec 2009- Wrote highly maintainable, solid code for multiple software applications.
- Earned consistent praise from the client for code quality and reliability.
03 — Selected Work
Research, recognition, and impact.
Model Inversion Attacks on Llama 3
Published research demonstrating PII extraction from large language models through model inversion. Explores attack surfaces in modern LLMs and proposes mitigations relevant to enterprises deploying generative AI.
Globee Awards — Technology Judge
Selected as a judge across four Globee Awards categories — Cybersecurity, Technology, Artificial Intelligence, and Customer Excellence — evaluating innovative products and platforms worldwide.
Security Vulnerability Disclosure — Wipro
Discovered and responsibly disclosed a security vulnerability in the Wipro Technologies internal portal. Recognized with an Honors-Awards mention for the contribution.
04 — Toolkit
The tech stack behind the work.
Security
Languages
Backend & Data
Cloud & Platform
Frontend
Leadership
Certifications & Recognition
- Harvard Leadership Excellence
- Sun Certified Java Programmer
- Judge — Globee® Awards for Cybersecurity
- Judge — Globee® Awards for Technology
- Judge — Globee® Awards for Artificial Intelligence
- Judge — Globee® Awards for Customer Excellence
Education
05 — Contact
Let's build something
worth securing.
Open to senior cybersecurity, staff engineering, and technical leadership conversations. Reach out — I'll respond personally.