# Hao Jin

> Principal Software Engineer at Roblox

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

• Engineering leader with 15+ years of experience in areas of, large scale recommender systems, Ads e2e ecosystem including indexing/retrieval/ranking/bidding/optimization, ML Infra, feed recommendations, short form video ranking and personalization, deep video content understanding, multimodal semantic extraction
• 15+ U.S./International patent applications and 10+ publications on top journals and international conferences in cloud computing and computer networking areas
• PhD degree with a focus on Cloud Computing and Data-driven Optimizations

Skills:
• Distributed System: Kafka, Flink, Spark, Redis, ElasticSearch, CockroachDB, MongoDB, Druid, Kubernetes, Docker
• ML Infrastructure: Real-time inference, feature pipelines, model training pipelines, CUDA, Triton, Kubeflow
• Language: Java, GO, Python, SQL, C#, Javascript, C
• Engineering Leadership: Architecture strategy, technical roadmap, cross-functional collaboration

## Work Experience
### Principal Software Engineer / TLM @ Roblox
Jan 2021 – Present
• Founding TL of Roblox's Recommendation Service team, building a recommendation-as-a-service that powers the personalized AI/ML recommendation for Roblox Moments (short form video product) and for millions of Roblox games.
• Founding TL of Roblox Ads: leading teams building full Ads systems at Roblox from scratch, including ads creation/delivery, modeling/ranking/bidding/pacing/budgeting, tracking/reporting/billing
• Founding TLM of Ads ML Infra team, building cutting-edge infra for large scale Ads retrieval, model training, inference, and ranking

### Staff Software Engineer @ Indeed.com
Jan 2018 – Jan 2021 | Austin, Texas
• Indeed Ads Backend - TL, Ads bidding optimization, real time bidding, pacing algorithm, ads delivery
• Internal platforms - TL, CRM tooling and data pipeline for Sales/Finance/CS
• CRM platforms - TL, enabling large-scale backend data pipelines for CRM business use cases

### Tech Lead Manager @ Indeed.com
Jan 2020 – Jan 2020 | Austin, Texas, United States
• TLM of the Indeed Internal Platform CRM Service team
• Delivered company-level projects uplifting revenue system efficiency and robustness

### Staff Engineer @ InterDigital Communications
Jan 2015 – Jan 2018 | King of Prussia, PA
•	Technical Lead for platform development and external partner solution integrations
•	Designed and implemented integration solutions that resulted in company press release and demonstrations at major trade shows
•	Cloud backend system R&D using modern enterprise software architecture and frameworks, such as micro-services, SOA, Spring MVC, Node.js, and AngularJS.
•	DevOp Lead responsible for establishment and maintenance of internal product development and testing process

### Senior Engineer, Next Generation Networks @ InterDigital Communications
Jan 2013 – Jan 2015 | King of Prussia, PA
•	Full stack developer for various software products, including cloud based network selection solution and wireless network management cloud system
•	Production experience and skills on backend enterprise software engineering, including Java, HTML/CSS, SQL, Javascript/jQuery, JSP/JSTL, Spring MVC, Hibernate, Ajex, Bootstrap, XML, JSON, Node.js, AgularJS, etc.
•	Managed off-shore developers: continuously defining tasks, tracking processes using scrum, reviewing results, and integrate the deliveries with existing products
•	Architecture and system design of Next Generation Wired/Wireless Networks
•	Designed and prototyped network systems with state-of-the-art SDN components and toolkits, e.g. OpenvSwitch, Floodlight, OpenDaylight, Mininet, OpenFlow HW switches, etc.
•	Introduced SDN to wireless world by publishing an article on IEEE Wireless Communications Magazine, "An Architecture for Software Defined Wireless Networking", which later becomes a featured article of the magazine

### Research Assistant @ Florida International University
Jan 2008 – Jan 2012 | Miami, FL
•	Thesis: Host and Network Optimizations for Performance Enhancement and Energy Efficiency in Data Center Networks
•	Developed network optimization algorithm that reduces costs and energy consumptions of virtualized data center networks by up to 70%
•	Built data center prototypes consisting of 48-port HP OpenFlow enabled ProCurve switches, Java OSGi based Beacon OpenFlow controller, 16 servers and 80+ VMware ESXi based virtual machines managed by VMware vCenter
•	Designed and implemented novel packet switch traffic scheduling and routing algorithms that achieve high throughput and low latency for network flows
•	Published 8 papers on top journals and conferences, including IEEE Transactions on Computers, IEEE INFOCOM, IEEE IPDPS, etc.

### R&D Intern @ InterDigital Communications
Jan 2011 – Jan 2011 | Melville, NY
•	Designed TCP flow-control enabled bandwidth aggregation solutions for 3GPP LTE network
•	Proposed Cellular-Wifi integrated Small Cell architectures for next generation wireless network
•	Applied 3 US and 1 Taiwanese patents based on the outcome of the internship

### Engineer @ BenQ
Jan 2006 – Jan 2008
•	Developed mobile terminals for 2G and 3G wireless communication networks
•	Led the infrastructure design and performance tuning of the states-leading TDS-CDMA project
•	Applied 1 Chinese patent and received 2 outstanding awards from the company

### Research Assistant @ Nanjing University
Jan 2005 – Jan 2006
•	Member of the state-leading R&D project: A Novel Bare-Eye 3D Display Technique.
•	Designed one of the key components: Image Integrator Module.


## Education
### Doctor of Philosophy (Ph.D.) in Computer Engineering
Florida International University

### Bachelor of Engineering in Electrical Engineering
Nanjing University


## Contact & Social
- LinkedIn: https://linkedin.com/in/haojin1

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Source: https://flows.cv/haojin
JSON Resume: https://flows.cv/haojin/resume.json
Last updated: 2026-04-12