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Hi, I’m Kai Wang, a Senior Software Engineer with a passion for building scalable, high-performance platforms across logistics, legal tech, and career marketplaces. I specialize in full-stack development, AI integration, microservices, and cloud infrastructure, and I enjoy turning complex problems into reliable, customer-centric solutions. Over the years, I’ve led engineering efforts at top tech companies, collaborated across product and engineering teams, and delivered features that boost engagement, efficiency, and user experience while keeping security and data privacy at the forefront.…Hi, I’m Kai Wang, a Senior Software Engineer with a passion for building scalable, high-performance platforms across logistics, legal tech, and career marketplaces. I specialize in full-stack development, AI integration, microservices, and cloud infrastructure, and I enjoy turning complex problems into reliable, customer-centric solutions. Over the years, I’ve led engineering efforts at top tech companies, collaborated across product and engineering teams, and delivered features that boost engagement, efficiency, and user experience while keeping security and data privacy at the forefront.

Kai Wang

Full Stack Developer, Back-End Developer, Web Developer, +2

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Hi, I’m Kai Wang, a Senior Software Engineer with a passion for building scalable, high-performance platforms across logistics, legal tech, and career marketplaces. I specialize in full-stack development, AI integration, microservices, and cloud infrastructure, and I enjoy turning complex problems into reliable, customer-centric solutions. Over the years, I’ve led engineering efforts at top tech companies, collaborated across product and engineering teams, and delivered features that boost engagement, efficiency, and user experience while keeping security and data privacy at the forefront.…Hi, I’m Kai Wang, a Senior Software Engineer with a passion for building scalable, high-performance platforms across logistics, legal tech, and career marketplaces. I specialize in full-stack development, AI integration, microservices, and cloud infrastructure, and I enjoy turning complex problems into reliable, customer-centric solutions. Over the years, I’ve led engineering efforts at top tech companies, collaborated across product and engineering teams, and delivered features that boost engagement, efficiency, and user experience while keeping security and data privacy at the forefront.

Available to hire

Hi, I’m Kai Wang, a Senior Software Engineer with a passion for building scalable, high-performance platforms across logistics, legal tech, and career marketplaces. I specialize in full-stack development, AI integration, microservices, and cloud infrastructure, and I enjoy turning complex problems into reliable, customer-centric solutions.

Over the years, I’ve led engineering efforts at top tech companies, collaborated across product and engineering teams, and delivered features that boost engagement, efficiency, and user experience while keeping security and data privacy at the forefront.

Skills

Experience Level

Expert

Expert

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Language

English

Fluent

Work Experience

Staff Software Engineer at DoorDash

August 1, 2022 - Present

Developed and optimized a real-time recommendation notification system, driving growth and user engagement through personalized recommendations and intelligent notifications. Spearheaded platform improvements to enhance recommendation efficiency, contributing to a 20% increase in customer retention. Designed scalable backend services and integrated AI-based recommendation systems to streamline customer experiences and optimize user engagement. Collaborated with product and engineering teams to ensure timely feature delivery, meeting performance, availability, and scalability requirements.

Staff Software Engineer at Snap Inc.

July 1, 2021 - August 1, 2022

Led the development of friend recommendation algorithms, utilizing embedding-based retrieval and personalized PageRank to drive social interactions on the platform. Optimized the retrieval ranking system to enhance recommendation relevance, improving user satisfaction and increasing engagement by 25%. Integrated machine learning models to enhance content personalization, refining algorithms based on A/B testing and user feedback. Worked closely with cross-functional teams to ensure the performance of recommendation systems met Snap's real-time processing standards.

Senior Software Engineer at Amazon

May 1, 2020 - July 1, 2021

Led the migration of a repeated purchase recommendation service, optimizing it for scalability and performance, reducing latency by 30%. Designed and implemented backend services for handling millions of customer data points while maintaining high availability and resilience. Delivered key features for the recommendation engine, improving operational efficiency and user engagement for Amazon’s consumer-facing applications. Collaborated with cross-functional teams to implement machine learning models and enhance data processing pipelines, significantly improving system throughput.

Software Engineer at Facebook

July 1, 2017 - May 1, 2020

Contributed to video growth strategies by enhancing co-watching and sports video engagement through the development of personalized recommendation systems. Developed and optimized search ranking infrastructure, including the integration of clickstream features and offline training data to improve search relevance. Enhanced backend systems supporting real-time video recommendation, resulting in a 20% increase in user engagement and viewing time. Led key initiatives in improving system scalability, reducing backend processing time by 40%.

Senior Software Engineer at Groupon

October 1, 2014 - July 1, 2017

Designed and implemented a backend web service for email recommendations, utilizing NoSQL databases and rule-based algorithms. Built an email and notification scheduling system that integrated with various backend services, boosting customer engagement by 15%. Collaborated with product and business teams to refine recommendation algorithms based on user feedback and business goals.

Research Assistant at Stony Brook University

August 1, 2010 - December 1, 2013

Conducted research in load balancing algorithms and nonlinear communication time optimization for distributed systems. Published findings in peer-reviewed journals, contributing to advancements in distributed computing and algorithm optimization.