Fabian Holler
Teamleiter Systemtest Testmanager at MELAG Medizintechnik
Berlin, Germany
Summary
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RockstarFabian Holler is a seasoned test manager and team lead with 12 years of experience driving system testing and quality assurance at MELAG Medizintechnik in Berlin. He combines hands-on test engineering roots with leadership in system test strategy, ensuring medical-device software meets rigorous reliability standards. An active open-source contributor, Fabian has improved back-end tooling in prominent projects like grpc-go and the Go GitHub client, and extended grafanalib with Elasticsearch support to broaden dashboard integrations. His contributions show a pragmatic focus on maintainability, resource-safety (fixing goroutine leaks), and clearer data models. Comfortable moving between Python and Go ecosystems, he brings a developer’s attention to detail to test automation and integration challenges. Colleagues rely on him to translate complex operational issues into robust, testable solutions.
12 years of coding experience
4 years of employment as a software developer
Github Skills (27)
dashboard10
python10
amqp10
amazon-elasticsearch10
testing10
microservices-application10
grafana10
refactor10
elasticsearchquery10
go10
github-api10
aws-elasticsearch10
golang10
elasticsearch10
refactoring10
Programming languages (14)
Github contributions (5)
rabbitmq/amqp091-go
Apr 2022 - Apr 2022
An AMQP 0-9-1 Go client maintained by the RabbitMQ team. Originally by @streadway: `streadway/amqp`
Role in this project:
Back-end Developer
Back-end DeveloperContributions:16 reviews, 20 commits, 7 PRs in 9 days
Contributions summary:Fabian primarily focused on improving the stability and reliability of the AMQP 0-9-1 Go client. Their contributions involved fixing a reader go-routine leak, which could occur on connection close, and ensuring the proper termination of go-routines in various scenarios. Furthermore, the user implemented checks to detect and prevent go-routine leaks in integration tests. They also refactored the channel code to improve its efficiency and maintainability.
golanggo-clientamqp-0-9-1amqprabbitmq
grpc/grpc-go
Oct 2017 - Jul 2019
The Go language implementation of gRPC. HTTP/2 based RPC
Role in this project:Back-end Developer
Back-end DeveloperContributions:27 reviews, 3 commits, 7 PRs in 1 year 9 months
Contributions summary:Fabian primarily focused on improving the gRPC Go implementation. They addressed inefficiencies by reducing log verbosity in balancer components. Additionally, the user fixed a JSON marshaling/unmarshaling issue related to gRPC codes, ensuring proper handling of uint32 values. They also improved code maintainability by refactoring and adding test cases.
golangnanoservicesrpcprotoprotobuf
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