Dave Hagman
Lead Engineer II at Klaviyo
Wilmington, Massachusetts, United States
Summary
👤
Senior🎓
Top SchoolDave Hagman is a Lead Engineer II with 11 years of experience designing and scaling high-throughput event ingestion and analytics platforms, currently building Klaviyo’s generalized analytical data solution. He specializes in distributed data systems—Spark, HDFS, ClickHouse—and architects pipelines that span low-latency OLAP to massive batch analytics across hundreds of terabytes and trillions of datapoints. Previously he led platform engineering at Threat Stack, where he solved real-time ingestion and event-sourcing challenges at extreme scale, and has full-stack and Salesforce experience from earlier roles. Colleagues rely on him to combine hands-on implementation with top-down system design and to mentor teams through iterative, metrics-driven delivery. He’s comfortable balancing pragmatic engineering trade-offs rather than chasing one-size-fits-all solutions, and has a history of launching foundational systems like Klaviyo’s first datalake that unlocked new product capabilities. Based in Wilmington, Massachusetts, he blends deep distributed-systems expertise with a curiosity for ambitious, privacy-forward architectures.
11 years of coding experience
13 years of employment as a software developer
Computer Science, Computer Science at Umass Boston
Github Skills (150)
stream-processing10
streaming10
reactive10
incremental-processing10
high-performance10
data-integration10
spark10
apache-flink10
uart9
blocking9
akka9
big-data9
sql9
akka-streams9
database9
Programming languages (8)
Github contributions (5)
haggy/Proton-IDE
Jul 2014 - Jul 2014
Contributions:39 commits, 1 comment in 11 days
haggy/is-not-thirteen
Mar 2016 - May 2017
Contributions:11 commits, 1 PR, 7 pushes in 1 year 1 month
is-12
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