John (Wukun) Liu
Summary
A software engineer focused on security with deep expertise on authentication, authorization, encryption systems and threat modeling with a strong interest in research.
Overview
5
5
years of professional experience
Work History
Software Engineer - Security
Google
07.2023 - Current
- Hypervisor-based access control. Designed and implemented next-generation (industry first) access-control / authorization system for code execution in secure environment for production and AI systems.
- Access control for sovereign-based cloud. Designed and implemented RBAC based access control for European Government on Google Cloud.
Software Engineer - Security
Tiktok
01.2022 - 12.2022
Authorization + KMS
- Designed / Implemented next-generation PBAC-based authorization service for Tiktok
- Designed RBAC WrappersAPIs for Authorization Service
- Co-Designed with PMs, FEs and Co-Implemented Authorization Service website landing page APIs
- Designed / Implemented Enveloped-based encryption service for Tiktok
Software Engineer
AWS Security
07.2019 - 04.2021
- Display Token: Leveraged AWS IAM + Secrets Manager + RDS to provide SafeNet Display Token support for Amazon Employees working with Public Sector
- Created monitoring service to secure secrets from human access and tampering using AWS Dynamodb + AWS Ticketing Service + Secrets Manager
- TOTP: Leveraged LastPass + Dynamodb + CloudHSM for providing TOTP authentication solution for Amazon Employees in India
Education
Bachelor of Science - Mathematics And Computer Science (3.6)
The College of William And Mary
08/2015 to 05/2019Skills
- Languages: Python, Java, C, C, Ruby, Go
- Database: MySQL, Dynamodb, ElasticSearch, FireBase
- Security Systems: OpenID Connect, Strong Auth, Authorization Frameworks (Expert), Encryption, Kms
- Security and Threat Modeling
Research Experience
IGEM 2016 - 2nd Place
- Differential Equation modeling and analysis of bacterial concentration on its speed to steadystate using Matlab
and Python Sklearn. - Analysed bacterial concentration data using pandas and fitted model with markov-chain monte carlo. https://2017.igem.org/Team:William_and_Mary/Model
- Created Website using Javascript, BootStrap and NodeJS
- Maintained team's user-end database, implemented FuzzySearch.JS for searching through the database
Accomplishments
- International Genetics Engineering Competition (IGEM) : Gold Medalist + First Runner Up (2 out of 343
teams) - William and Mary 2019 Hackathon: Grand Prize Winner
Timeline
Software Engineer - Security
Google
07.2023 - Current
Software Engineer - Security
Tiktok
01.2022 - 12.2022
Software Engineer
AWS Security
07.2019 - 04.2021
Bachelor of Science - Mathematics And Computer Science (3.6)
The College of William And Mary
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