Frank Koornstra
Senior Freelance Backend Engineer (Kotlin) at DHL eCommerce Nederland
Uithoorn, North Holland, Netherlands
Summary
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Rockstar🎓
Top SchoolFrank Koornstra is a Senior Kotlin backend engineer with 11 years of experience building scalable, message-driven microservice architectures for high-throughput platforms. He designs and implements cloud-native systems using Kotlin, Spring Boot, Kafka, Elasticsearch, Flink, Kubernetes and Terraform, and has repeatedly converted slow legacy architectures into fast, observable platforms with measurable business impact. Frank co-founded Baseboard to streamline production documentation workflows and has driven major search and data pipelines—cutting latency and boosting conversion—at companies like Gorgias and Momentive. Based in the Netherlands, he blends hands-on implementation (including developer tooling and Gradle plugins) with pragmatic architecture and infrastructure-as-code practices. An unexpected strength is his focus on making complex streaming and search systems easy for teams to adopt, turning specialist infrastructure into repeatable developer workflows.
11 years of coding experience
15 years of employment as a software developer
Bachelor of ICT Business & ICT, Bachelor of ICT Business & ICT at HanzeMaster of Business Administration (MBA) Business & ICT, Master of Business Administration (MBA) Business & ICT at University of Groningen
English, Dutch, northern frisian
Stackoverflow
1reputation
0reached
0answers
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Github Skills (145)
pnpm10
debezium10
databases10
elasticsearch10
data-pipeline10
schema10
avro10
rest10
event-streaming10
skeleton10
database10
cdc10
kafka-connect10
search-engine10
confluent-schema-registry10
Programming languages (13)
Github contributions (5)
frankkoornstra/elastic-apm-agent
Apr 2018 - Sep 2018
Elastic Application Performance Monitoring (APM) agent for PHP
Contributions:9 releases, 53 commits, 28 PRs in 5 months
performance-monitoringphpelasticapmapm-server
frankkoornstra/elasticsearch-gist-operator
Apr 2020 - Feb 2023
Operator for Kubernetes that will take care of the gist of your Elasticsearch cluster
Contributions:34 PRs, 141 pushes, 36 branches in 2 years 9 months
operatorcarekuberneteselasticsearch-clusterelasticsearch
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