# Jack L.

> Senior Software Engineer @ Tiktok || Trust and Safety

Location: San Francisco Bay Area, United States
Profile: https://flows.cv/jackl

🔍 Senior Software Engineer | Backend Engineer | Platform Engineer | Distributed Systems

🚀 My name is Jack Lian, a Senior Software Engineer with 7+ years of experience in backend engineering, platform engineering, and distributed systems. Currently at TikTok (Trust & Safety), building high-availability, large-scale microservices for 🌍 content moderation, reporting, and appeal systems serving millions of users.

🧠 Core Skills / Keywords
Backend Development · Platform Engineering · Distributed Systems · Microservices Architecture · Go (Golang) · Java · Python · REST / RPC (Thrift, Protobuf) · ☁️ Cloud Computing · AWS · GCP · ☸️ Kubernetes · 🐳 Docker · CI/CD · Jenkins · 🤖 Automation Testing · Test Coverage · 📊 Observability · Metrics · Monitoring · 🚨 Alerting · Grafana · Logging · Data Pipelines · Reliability Engineering · Scalability · ⚡ Performance Optimization · High Availability · Fault Tolerance · API Design · SQL · MySQL · Kafka · Data Migration

🏗 Domain Experience
🛡 Trust & Safety · Content Moderation · Compliance · 🇪🇺 EU Digital Services Act (DSA) · Risk Systems · ☁️ Cloud Infrastructure · 🏥 Healthcare Systems · 🏛 Government & Medicaid Platforms · 🔐 Security · Identity & Certificate Management · ☸️ Kubernetes Operators · 🌐 Cross-Cloud Systems · 📈 Performance Benchmarking · Load Testing · QPS · Latency Optimization

🎯 Impact Highlights
✅ Built and owned Go-based microservices
📈 Increased automation test coverage from 0–20% → 50–80%
🧩 Established unified testing frameworks across 20+ services
📊 Designed real-time business metrics & alerting pipelines
🏢 Supported data center onboarding/offboarding
📜 Passed external regulatory & compliance audits
🤝 Mentored engineers and contributed to hiring

🎯 Target Roles
Senior Backend Engineer · Senior Platform Engineer · Infrastructure Engineer · Distributed Systems Engineer · Site Reliability / Production Engineer · Trust & Safety Engineer · Payments / Data Platform Engineer

💬 Open to conversations about high-scale backend & platform roles at tech companies building systems with real-world impact 🌍

## Work Experience
### Senior Software Engineer @ TikTok
Jan 2023 – Present | San Francisco Bay Area
Trust and Safety

### Software Engineer II @ TigerGraph
Jan 2021 – Jan 2023 | San Francisco Bay Area
Tigergraph(www.tigergraph.com): The Only Scalable Graph Database for the Enterprise
• Implemented benchmark test modules on Jenkins to measure QPS and Query time cost by writing bash scripts
and third-party tools called wrk and Pewpew.
• Contributed and designed test cases for a large amount of nodes' availability with different data sizes (ongoing).
• Performed Kafka connector tests to load data from AWS S3, ABS, and GCS to support WKH cloud feature.
• Executed manual tests on Tigergraph Kubernetes(GKE, EKS, AKS) operator with single server and clusters.
• Leveraged knowledge in Linux, Kubernetes, Docker, Helm, Kafka, Bash, Jenkins, GSQL

### Software Engineer @ Collective Medical
Jan 2020 – Jan 2021 | Salt Lake City, Utah, United States
Collective Medical(www.collectivemedical.com): Closing the Healthcare Communication Gap
• Monitored team-wide Splunk logs in order to debug failures and update CVE (Common Vulnerability
Exposure).
• Deployed weekly releases and builds to Atlassian Bamboo through Docker containers.
• Developed e2e test scripts to implement test scenarios and features for BDD (Behavior Driven Development)
by using Java Jbehave.
• Performed and documented endpoint responses, JSON data formats, and API tests by using Postman.
• Leveraged knowledge in Java Jbehave, Git, Programming in Java using IntelliJ, Splunk, Atlassian Bamboo, Linux,
Ubuntu, MySQL, Postman, HL7, Docker, Kafka, Gradle, Kubernetes

### Software Engineer Intern @ Venafi
Jan 2019 – Jan 2019 | Greater Salt Lake City Area
Company: Venafi Inc.
Team: Server Agent
Product: https://support.venafi.com/hc/en-us/sections/203604647-Venafi-Agent
Manager: Cary Woodland
Mentors: Reid Poole, Patrick Campbell, Lili Peng

• Discovered and fixed 2 multibyte conversion bugs that would display Chinese SSL certificates’ friendly names 
and clients’ user names incorrectly.
• Deployed an automated continuous integration system using Jenkins and VMware in order to scan the SSL
certificates in Microsoft CAPI store.
• Improved the Python API tests by 8% by automating unzipping tar files for data transmission between local 
database and web servers.
• Leveraged knowledge in Linux, Ubuntu, Vim, programming in Objective-C using Visual Studio 2017, Python 
using PyCharm 3.5, and integrated automation testing with Jenkins, VMware.

### Software Engineer Intern @ Indus Valley Partners
Jan 2019 – Jan 2019 | Greater Salt Lake City Area
Company: Indus Valley Partners
Team: Ivp Polaris
Product: https://www.ivp.in/portfolio/ivp-polaris/ & Polaris Database
Manager: Himadri Bagchi
Mentors: Dhruv Shah, Ankita Gupta & Ananth Ramaswamy

### Software Engineer Intern @ Symantec
Jan 2018 – Jan 2018 | Greater Salt Lake City Area
Company: Symantec
Team: WebPulse
Product: https://sitereview.bluecoat.com/#/
Manager: Dale Asay
Mentors: Jeff Vincent & Jim Schnitter

 • Implemented refactoring product’s category names and descriptions for new version release by rewriting 
MySQL scripts.
• Utilized Fiddler to debug traffics between clients and web servers.
• Increased test efficiency by 29% by using Java Selenium to automate the test-cases for the Web-Pulse Site￾review (sitereview.bluecoat.com).
• Integrated the GoCD for maintaining test-cases by tracking the bug and story variables.
• Leveraged knowledge in Full Stack Web development, Jira, JavaScript, MySQL, SQLite, GoCD, Fiddler, Git

### Quality Assurance Intern @ University of Utah School of Medicine
Jan 2017 – Jan 2018 | Greater Salt Lake City Area
Company: University of Utah
Team: University Faculty Information & Support
Product: https://faculty.utah.edu/activityreport/login.hml
Manager: Jeremy Uffens
Mentor: Robby Miller

• Improved refactoring test scripts by reducing unnecessary codes through analyzing the test reports
• Established remote testing development environment using Java Selenium and bash scripts for Faculty Activity 
Report Website(https://faculty.utah.edu/)
• Leveraged knowledge in Unit testing, Bitbucket, Java Selenium, Sourcetree

### Campus Recreation Facility Manager @ University of Utah - Employment
Jan 2017 – Jan 2017 | Greater Salt Lake City Area
Company: University of Utah
Team: Campus Recreation Services
Manager: Jeanne Huelskamp
Mentor: Gregory Reinhardt

• Supervised 150+ facility guests in the Core area, ensuring patron satisfaction
• Prepared monthly employee performance reports
• Helped 10+ new employees' training and assisted them to get into a routine for their
   tasks

### Student Life Center Gear Central & Core Staff @ University of Utah - Employment
Jan 2016 – Jan 2017 | Salt Lake City, UT
Company: University of Utah
Team: Campus Recreation Services
Manager: Jeanne Huelskamp
Mentor: Gregory Reinhardt

• Managed the sales and rentals inventory during closing shift at Gear Central
• Maintained an accurate cash draw of over $100 per shift
• Ensured there was a steady supply of recreational equipment and towels


## Education
### Bachelor's degree in Computer Science
University of Utah John and Marcia Price College of Engineering

### Associate's Degree in Computer Science
Dixie State University


## Contact & Social
- LinkedIn: https://linkedin.com/in/ylian
- GitHub: https://github.com/yingjielian

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Source: https://flows.cv/jackl
JSON Resume: https://flows.cv/jackl/resume.json
Last updated: 2026-03-29