Nils Hartmann
Senior Software Entwickler (Freiberuflich)
Hamburg, Germany
Summary
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SeniorNils Hartmann is a senior freelance software engineer from Hamburg with 15 years of experience building backend systems (Java, Spring, GraphQL) and modern frontends (React, TypeScript). He has worked as an architect and senior developer across logistics, insurance, and media companies, and now combines consulting, hands-on delivery, and training through workshops. Nils contributes to open source—enhancing Debezium examples with KStreams and real-time WebSocket/GraphQL subscription features—showing strong expertise in stream processing and API design. Co-author of a German React book, he brings practical teaching experience that complements his project work and helps teams adopt TypeScript, React, and GraphQL effectively.
15 years of coding experience
6 years of employment as a software developer
Stackoverflow
476reputation
16kreached
23answers
0questions
Github Skills (23)
debezium10
kafka-streams10
java10
javas10
wpgraphql9
websocket9
wordpress-graphql9
websockets-client9
client-websocket9
websocket-client9
graphql9
change-data-capture8
query-by-example7
graphql-java6
react6
Programming languages (7)
Github contributions (5)
debezium/debezium-examples
Sep 2018 - Oct 2018
Examples for running Debezium (Configuration, Docker Compose files etc.)
Role in this project:
Backend Developer
Backend DeveloperContributions:6 commits, 4 PRs, 4 comments in 9 days
Contributions summary:Nils focused on enhancing the `debezium-examples` repository, particularly within the `kstreams-live-update` example. Their contributions involved extracting and refactoring code related to KStreams builder creation, and integrating a WebSocket endpoint for real-time data updates. They also implemented features for a GraphQL subscription, adding functionality for filtering subscription data, demonstrating a good understanding of stream processing and API development.
debeziumchange-data-capturedockercomposedocker-compose-files
nilshartmann/spring-graphql-talk
Jan 2022 - Dec 2022
Contributions:31 commits, 17 pushes, 2 branches in 10 months
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