Ben Fleis
Software Engineer at DuckLabs
Amsterdam, North Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolBen Fleis is a seasoned software engineer with 13 years of experience building scalable distributed systems and leading engineering teams across companies like Uber and Databricks, now based in Amsterdam. He combines deep backend expertise—demonstrated by work on high-performance network and traffic databases and real-time bidding platforms—with hands-on contributions to open-source projects such as porting and optimizing the Datascript immutable DB/Datalog engine for Clojure/JS. Comfortable switching between individual contributor and management roles, Ben has a track record of shipping production systems, improving test coverage and performance, and architecting resilient deployments. His background in both low-level systems (network analysis, C/C++) and cloud-native tooling (Kafka, Docker, AWS) gives him a pragmatic edge in solving hard scaling problems. An M.S. in Computer Science and an uncommon sidestep into fine furniture design reflect a blend of analytical rigor and craft-focused attention to detail.
13 years of coding experience
19 years of employment as a software developer
M.S., Computer Science, M.S., Computer Science at University of MichiganN/A, Fine Furniture design and construction, N/A, Fine Furniture design and construction at Center for Furniture CraftsmanshipB.S., Computer Science, B.S., Computer Science at Michigan State University
Stackoverflow
113reputation
5kreached
0answers
2questions
Github Skills (11)
clojure10
databases10
clojure-cli10
clojurescript10
database10
testing9
macros6
extjs6
reader6
has-many6
conditional-statements6
Programming languages (14)
Github contributions (5)
tonsky/datascript
Apr 2015 - May 2015
Immutable database and Datalog query engine for Clojure, ClojureScript and JS
Role in this project:
Back-end Developer
Back-end DeveloperContributions:24 commits, 11 PRs, 21 pushes in 1 month
Contributions summary:Ben primarily focused on porting and adapting the Datascript codebase for compatibility across Clojure and ClojureScript. They refactored code, updating file extensions and adjusting project dependencies. Furthermore, the user worked on enhancing testing, specifically for the `btset` and `entity` features, ensuring functionality across both CLJ and CLJS environments. They also introduced optimizations, improved code structure, and corrected type handling to improve performance.
clojureclojurescriptdatabasedatalogjs
benfleis/samples
Mar 2013 - Dec 2014
Contributions:8 commits, 1 push in 1 year 9 months
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