Leon Mergen
Head Of Solutions at quasardb - limitless timeseries
Driebergen-Rijsenburg, Utrecht, France
Summary
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RockstarLeon Mergen is a seasoned software leader with 16 years of experience, currently Head of Solutions at Quasardb, where he bridges product needs and scalable timeseries engineering. He has a strong hands-on background as a CTO and founder, having led technical development, operations and quality at startups including Autheos and AdDynamics. A pragmatic backend engineer and active open-source contributor, Leon has made notable contributions to Clojure projects like Aleph (adding multi-format form encoding) and Onyx (job metadata APIs and platform improvements). He combines systems-level thinking with practical optimizations—early in his career he automated fax and call infrastructures to cut costs and streamline operations. Based in the Netherlands with French ties, he pairs entrepreneurial drive with a focus on maintainable, high-quality code and reliable distributed systems.
16 years of coding experience
14 years of employment as a software developer
Stackoverflow
336reputation
16kreached
3answers
4questions
Github Skills (26)
apidoc10
clojure-cli10
http10
clojure10
http-client10
api10
data-processing10
software-distribution9
software-update9
github-release9
webserver9
auto-release9
version-control8
concurrency8
tcp8
Programming languages (22)
Github contributions (5)
onyx-platform/onyx
Apr 2017 - Aug 2019
Distributed, masterless, high performance, fault tolerant data processing
Role in this project:
Back-end Developer
Back-end DeveloperContributions:21 commits, 7 PRs, 23 pushes in 2 years 4 months
Contributions summary:Leon primarily contributed to the Onyx data processing platform by implementing new features, refactoring existing code, and fixing bugs. They added an API to retrieve job metadata, demonstrating an understanding of the platform's public interface and how to provide access to job information. The commits include modifications to Clojure code, fixing build links and upgrading Clojure versions. Additionally, the user updated dependencies and marked releases of new versions of the platform.
fault-tolerantstream-processingdata-processingfaultdata-stream
clj-commons/aleph
Jul 2016 - Dec 2016
Asynchronous streaming communication for Clojure - web server, web client, and raw TCP/UDP
Role in this project:Back-end Developer
Back-end DeveloperContributions:16 commits, 2 PRs, 18 comments in 4 months
Contributions summary:Leon contributed significantly to the Aleph library by adding support for different form parameter encodings, including JSON, EDN, Transit+JSON, and Transit+Msgpack. They modified the client middleware to handle these new content types and implemented corresponding encoding and decoding methods. Further commits include code refactoring, indentation fixes, and the removal of dead code, demonstrating a focus on code quality and maintainability.
non-blockingwebsocketsweb-serverasynchronoushttp-client
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