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resume.json
{
"$schema": "https://raw.githubusercontent.com/jsonresume/resume-schema/v1.0.0/schema.json",
"basics": {
"name": "Junjun Deng",
"label": "Staff Software Engineer | ML Infrastructure & Distributed Systems",
"image": "",
"email": "[email protected]",
"phone": "+8613126496289",
"url": "https://medium.com/@cnjdeng",
"summary": "Staff Software Engineer with 10+ years of experience specializing in ML Infrastructure, distributed systems, and large-scale recommendation systems. Currently leading MLOps initiatives at Tubi, serving 100M+ monthly active users. Expertise in Kubernetes, experimentation platforms, and high-performance backend services.",
"location": {
"countryCode": "CN",
"region": "China"
},
"profiles": [
{
"network": "GitHub",
"username": "lilac",
"url": "https://github.com/lilac"
},
{
"network": "Medium",
"username": "cnjdeng",
"url": "https://medium.com/@cnjdeng"
}
]
},
"work": [
{
"name": "Tubi Inc.",
"position": "Staff Software Engineer",
"url": "https://tubitv.com",
"startDate": "2021-01",
"summary": "Serve as a key member of the ML Infrastructure team at Tubi, a leading US AVOD streaming service with 100M+ monthly active users.",
"highlights": [
"Architect and maintain critical MLOps services that power Tubi's recommendation system",
"Built online feature store processing 500K+ reads/sec and 1M+ writes/sec",
"Manage personalization orchestrator service coordinating 100+ machine learning models",
"Drive infrastructure improvements directly impacting user engagement and platform scalability"
]
},
{
"name": "Alibaba Group",
"position": "Senior Software Engineer",
"url": "https://www.alibaba.com",
"startDate": "2018-11",
"endDate": "2020-12",
"summary": "Led the design and implementation of multiple mission-critical services for UC News, a service integrated with UC Browser serving 100M+ users.",
"highlights": [
"Designed and implemented mission-critical services for UC News platform",
"Served 100M+ users across multiple regions",
"Built high-performance backend services with focus on scalability and reliability"
]
},
{
"name": "Maiduote Ltd",
"position": "Architect & R&D Director",
"startDate": "2017-09",
"endDate": "2018-11",
"summary": "Directed R&D department and established AI department from the ground up.",
"highlights": [
"Established and led a 5-person AI department from scratch",
"Delivered knowledge graph-based chatbot for healthcare platform",
"Reduced doctor-patient communication time by 60% while maintaining high accuracy",
"Led architectural refactoring of 24haowan.com healthcare platform"
]
},
{
"name": "Shuyun E-commerce Ltd",
"position": "Cofounder & Technical Lead",
"startDate": "2016-07",
"endDate": "2017-09",
"summary": "Co-founded and served as Technical Lead for a startup.",
"highlights": [
"Conceptualized and built SameMo, a smart photo-sharing application with facial recognition",
"Delivered complete solution: back-end infrastructure, iOS and Android apps in 4 months",
"Led product vision and full-stack development from concept to market launch",
"Pioneered innovative photo collection technology in Chinese market"
]
},
{
"name": "SafetyCulture Inc.",
"position": "Senior Software Engineer",
"url": "https://safetyculture.com",
"startDate": "2015-01",
"endDate": "2016-06",
"summary": "Developed and maintained Android application for iAuditor, a leading workplace safety inspection platform used by 30K+ organizations worldwide.",
"highlights": [
"Built key features for iAuditor Android app used by 30K+ organizations",
"Implemented offline data synchronization and report generation",
"Contributed to mobile application serving global enterprise customers"
]
}
],
"education": [
{
"institution": "University of Western Sydney",
"url": "https://www.westernsydney.edu.au",
"area": "Computing and Mathematics",
"studyType": "Master of Science (Honours)",
"startDate": "2012",
"endDate": "2014",
"score": "",
"courses": [
"Answer Set Programming",
"Artificial Intelligence"
]
},
{
"institution": "Sun Yat-sen University",
"url": "https://www.sysu.edu.cn",
"area": "Network Engineering",
"studyType": "Bachelor of Engineering",
"startDate": "2007",
"endDate": "2011",
"score": "3.7/4.0",
"courses": [
"Distributed Systems",
"Algorithms",
"Network Architecture"
]
}
],
"awards": [
{
"title": "Qatar National Foundation Postgraduate Research Award",
"date": "2012",
"awarder": "University of Western Sydney",
"summary": "Full scholarship for postgraduate research (2012-2014)"
},
{
"title": "National Endeavor Scholarship",
"date": "2010",
"awarder": "Sun Yat-sen University",
"summary": "Merit-based scholarship for academic excellence"
}
],
"publications": [
{
"name": "Answer Set Programming with One Incremental Variable (ivASP)",
"publisher": "Academic Journal",
"releaseDate": "2014",
"summary": "Proposed ivASP as a novel extension to traditional Answer Set Programming. Developed a complete solver implementation and published peer-reviewed research documenting theoretical foundations and practical applications."
}
],
"skills": [
{
"name": "ML Infrastructure",
"level": "Expert",
"keywords": [
"Kubernetes",
"Docker",
"MLOps",
"Model Serving",
"Microservices",
"HPA/VPA"
]
},
{
"name": "Experimentation",
"level": "Expert",
"keywords": [
"A/B Testing",
"Interleaving Experiments",
"Statistical Analysis"
]
},
{
"name": "Programming Languages",
"level": "Expert",
"keywords": [
"Python",
"Java",
"Scala",
"C/C++",
"TypeScript",
"Rust",
"Haskell",
"Go"
]
},
{
"name": "Cloud & DevOps",
"level": "Advanced",
"keywords": [
"AWS",
"GCP",
"Terraform",
"CI/CD",
"Infrastructure-as-Code"
]
},
{
"name": "ML & Data",
"level": "Advanced",
"keywords": [
"TensorFlow",
"Recommendation Systems",
"Distributed Training"
]
},
{
"name": "Backend",
"level": "Expert",
"keywords": [
"MySQL",
"Cassandra",
"PostgreSQL",
"Redis",
"Message Queues"
]
},
{
"name": "Systems",
"level": "Expert",
"keywords": [
"Linux/Unix",
"Distributed Systems",
"Monitoring & Observability"
]
},
{
"name": "Web Development",
"level": "Advanced",
"keywords": [
"React",
"Flask",
"Django",
"REST APIs",
"gRPC"
]
}
],
"languages": [
{
"language": "Chinese",
"fluency": "Native speaker"
},
{
"language": "English",
"fluency": "Fluent (IELTS 7)"
}
],
"projects": [
{
"name": "Accelerating ML Experimentation with Interleaving - 20x Sensitivity Gain",
"startDate": "2025",
"endDate": "2025",
"description": "Led a cross-team initiative to implement interleaving experiments for Tubi's recommendation system, achieving 20x higher sensitivity compared to traditional A/B testing.",
"highlights": [
"Achieved 20x higher sensitivity compared to traditional A/B testing",
"Enabled direct comparison of ranking algorithms through interleaved result presentation",
"Reduced experiment duration from weeks to days",
"Accelerated ML model iteration velocity across entire ML organization"
],
"keywords": [
"Experimentation",
"A/B Testing",
"Interleaving",
"Recommendation Systems",
"ML Infrastructure"
]
},
{
"name": "Automated Resource Optimization for Large-Scale ML Model Serving",
"startDate": "2024",
"endDate": "2024",
"description": "Led a cost optimization initiative for Tubi's machine learning infrastructure, managing hundreds of Kubernetes pods serving 100+ models.",
"highlights": [
"Managed hundreds of Kubernetes pods serving 100+ models across thousands of CPU cores",
"Implemented intelligent orchestration of HPA and VPA",
"Achieved 24% reduction in infrastructure costs (saving $500K+ annually)",
"Maintained service quality while optimizing resource utilization"
],
"keywords": [
"Kubernetes",
"Cost Optimization",
"MLOps",
"HPA",
"VPA",
"Resource Management"
]
},
{
"name": "SameMo - Smart Photo Sharing Platform",
"startDate": "2016",
"endDate": "2017",
"description": "Developed an innovative mobile application that leverages facial recognition technology to automatically help users discover and collect their photos taken by others.",
"highlights": [
"Leveraged facial recognition for automatic photo collection",
"Pioneered concept in Chinese market",
"Single-handedly designed complete product experience and full-stack implementation",
"Delivered production-ready back-end, iOS, and Android apps in 4 months"
],
"keywords": [
"Mobile Development",
"Facial Recognition",
"iOS",
"Android",
"Product Design"
]
},
{
"name": "Android Port of ImageMagick",
"startDate": "2014",
"description": "Successfully ported the renowned cross-platform ImageMagick image processing library to Android OS.",
"highlights": [
"Enabled advanced image manipulation capabilities for mobile developers",
"Gained 200+ GitHub stars",
"Actively used in production applications requiring professional-grade image processing"
],
"url": "https://github.com/lilac/Android-ImageMagick",
"keywords": [
"Android",
"ImageMagick",
"Open Source",
"Image Processing"
]
},
{
"name": "KubeScript",
"startDate": "2022",
"description": "Founded and currently lead the KubeScript open-source project, a DRY infrastructure-as-code solution that simplifies Kubernetes DevOps workflows.",
"highlights": [
"Created DRY infrastructure-as-code solution for Kubernetes",
"Reduces configuration complexity for multi-environment management",
"Improves maintainability for teams managing Kubernetes deployments"
],
"url": "https://github.com/in-fun/KubeScript",
"keywords": [
"Kubernetes",
"Infrastructure-as-Code",
"DevOps",
"Open Source"
]
},
{
"name": "Open Source Contributions",
"description": "Contributed to various open-source projects.",
"highlights": [
"Rust programming language",
"TensorFlow",
"Helidon web server"
],
"keywords": [
"Open Source",
"Rust",
"TensorFlow",
"Helidon"
]
}
]
}
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