Don Mitchell
Principal Software Engineer at Delivery Hero
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolDon Mitchell is a Principal Software Engineer based in Berlin with 13+ years of experience building and architecting high-scale, data-driven systems across adtech, edtech, and SaaS. He combines deep expertise in Kotlin, Java, Python and coroutines with practical mastery of SQL/NoSQL systems (Mongo, Cassandra), queueing, and query optimization to deliver resilient, performance-focused architectures. At CarGurus he led online advertising architecture for billions of ads, applying probabilistic modeling and fine-grained experimentation to optimize bids and ROAS, and now oversees adtech standards and strategy at Delivery Hero. Known for pragmatic, efficient engineering, he repeatedly refactors fragile ETL and distributed systems into resumable, incremental state-machine architectures that scale. Trained as a cognitive scientist (PhD, Northwestern), he brings a rare blend of formal analytical thinking and production-hardened software craftsmanship.
13 years of coding experience
14 years of employment as a software developer
PhD Cognitive Science, PhD Cognitive Science at Northwestern UniversityBS Research psychology, BS Research psychology at Wheaton College
Stackoverflow
175reputation
42kreached
8answers
11questions
Github Skills (64)
kotlin10
realtime-updates10
lms10
edx10
ktorm10
sequence10
dsl9
facebook-api9
facebook9
java9
pool9
facebook-ads9
sqlite9
connection-pool9
sql9
Programming languages (7)
Github contributions (5)
dmitchell/snowflake-jdbc
Jun 2020 - Aug 2022
Snowflake JDBC Driver
Contributions:3 pushes, 1 branch in 2 years 2 months
mysqlsqlspring-jdbcsnowflakedatabase
Placester/Data-Listing-Import-RETS-Java-Lib
Apr 2015 - Jan 2016
Contributions:12 PRs, 15 pushes, 12 branches in 9 months
javaretscart
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