# Kevin L.

> Senior Software Engineer at Walmart Global Tech

Location: Fremont, California, United States
Profile: https://flows.cv/kevinl3

• Software engineer with 10+ years of industry experience. 
• Delivered large-scale, distributed backend systems and services. 
• Interested in joining a team that works on challenging and creative software projects.

## Work Experience
### Senior Software Engineer @ Walmart Global Tech
Jan 2023 – Present | Sunnyvale, California
• Developed and maintained high-performance systems for real-time bidding, ad serving, and auction platforms, to support millions of daily transactions with sub-50ms latency.
• Led optimization of the end-to-end ML serving stack (data processing, model evaluation, feature generation, model inference, fine-tuning, A/B testing infrastructure), reducing inference costs and improving model freshness.
• Designed and productionized a highly reliable daily ML model evaluation and auto-promotion pipeline using Apache Airflow; orchestrated model validation, performance benchmarking, shadow traffic testing, and safe rollout, reducing manual promotion time from days to under 4 hours while ensuring zero regression incidents.
• Developed a lightweight, high-performance Java SDK integrated into serving paths; achieved sub-millisecond overhead for feature logging and bucket assignment while streaming billions of events daily to Kafka → GCS/Data Lake for offline analysis.
• Optimized the full experimentation data lifecycle (event ingestion, joining, metric computation) in the data lake, cutting average experiment analysis latency from 24+ hours to under 3 hours.
• Architected low-latency microservices for retrieving feature data from Cassandra DB for online model serving, incorporating caching strategies to reduce latency by 60% and enhance throughput.

### Senior Software Engineer @ Tact.ai
Jan 2020 – Jan 2023 | Sunnyvale, California, United States
• Owned requirements gathering, design, development, testing, deployment, and providing operational excellence and support for mid to large-scale projects.
• Designed and developed Java distributed system for Enterprise Grade Data Vault (with BYOK support) using Postgres running on AWS RDS DB cluster.
• Designed and developed Java Micro-service implementation for metadata syncing and updating, establishing core infrastructure serving multiple teams.
• Created deployment strategies and maintain high availability of servers in AWS.

### Software Engineer @ Tact.ai
Jan 2018 – Jan 2020 | Sunnyvale, CA
• Developed high availability distributed services integrate Tact with external APIs, including third-party Customer Relationship Management (CRM) systems, Content Management Systems (CMS), and other partner applications.
• Developed RESTful APIs and Micro-services, serving as a robust backend for mobile clients (iOS and Android).

### Site Reliability Engineer @ Union Mobile Financial Technology International
Jan 2016 – Jan 2018 | San Mateo, California, United States
• Improved system reliability through the optimization of on-call processes.
• Conducted post-incident reviews and documented diagnostic procedures in the team’s runbooks.
• Built product demo of e-commerce web integrating to our online payment solution using Java Spring MVC as backend and JavaScript as frontend.


## Education
### Bachelor's degree in Computer Science
Tianjin University of Science & Technology


## Contact & Social
- LinkedIn: https://linkedin.com/in/kevin-l-6b62a9a8

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Source: https://flows.cv/kevinl3
JSON Resume: https://flows.cv/kevinl3/resume.json
Last updated: 2026-03-23