Tianyi Ren
ECE Master’s @ CMU | Machine Learning, Deep Learning, & Cloud Systems | Software Engineer
- Role
- Full Stack Software Engineer Intern at Innovation Ai
- Location
- Pittsburgh, PA, US
- LinkedIn followers
- 500 followers
Experience
Full Stack Software Engineer Intern
Jun 2025 — Present · New York, NY, US
Designed and implemented a robust multi-factor authentication (MFA) system supporting SMS and email code delivery using Spring Boot, Twilio, and Mailgun; reduced unauthorized login attempts and improved platform security compliance for all user accounts. • Developed RESTful authentication endpoints (/api/login,/api/verify-2fa,/api/trusted-devices,/api/revoke-device) leveraging RESTful standards, enabling secure login flows and device trust management for large users, with % session continuity on trusted devices.• Engineered a secure \"trusted device\" token system using JWT and HttpOnly cookies, resulting in a seamless re-login experience and a % decrease in repeat 2FA prompts for users on known devices.• Collaborated with frontend developers to deliver an intuitive 2FA workflow and device management UI with Vue.js and Vuetify, leading to a % increase in successful first-time user logins.• Established session timeout and device trust policies (1-hour session expiry, 30-day device trust), balancing security and usability; contributed to zero major account takeovers during the internship period.• Wrote detailed technical design documentation and delivered a proof-of-concept, accelerating stakeholder buy-in and reducing feature implementation time by day/weeks.• Implemented audit logging and 2FA attempt tracking, supporting security audits and helping the team identify and block suspicious login activity in real time.
Education
Carnegie Mellon University
Master of Science - MS
2024 — 2025
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