Johan Haals
Senior Engineer - Core Infrastructure at Spotify
Greater Stockholm Metropolitan Area Sweden
Summary
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RockstarJohan Haals is a senior infrastructure engineer with 17 years building reliable, large-scale service platforms and developer tooling, currently shaping perimeter and service routing at Spotify. He’s a core Backstage maintainer and active open-source contributor, with notable backend work on secure-sharing tools (yopass), the Backstage catalog, and long-running fixes in Puppet’s server automation. Comfortable across cloud-native stacks—GCP, Kubernetes, gRPC, Envoy, Java, Go—he combines SRE rigor with full-stack contributions to demos and plugins. Colleagues know him for reducing API surface and improving platform testability, and for pragmatic fixes that prevent real-world outages (e.g., lockfile and compression bug remediation).
17 years of coding experience
9 years of employment as a software developer
English, Swedish
Github Skills (35)
puppeteer10
encrypt10
openpgp10
catalog10
apidoc10
puppet10
decryption10
rspec10
databases10
typescript10
ruby10
crypt10
backstage10
go10
api10
Programming languages (15)
Github contributions (5)
jhaals/yopass
Jan 2014 - Jan 2023
Secure sharing of secrets, passwords and files
Role in this project:
Back-end Developer
Back-end DeveloperContributions:53 releases, 29 reviews, 934 commits in 9 years 1 month
Contributions summary:Johan contributed to the "jhaals/yopass" repository, which is designed for securely sharing secrets. The commits demonstrate the user's involvement in implementing core back-end features, specifically focusing on the 404 view and the logic to handle secret retrieval with decryption and database interactions. The user also improved the index view and made a config file in production settings with SMS provider support.
passwordssecuresecurity-toolssharing-secretssecurity
backstage/backstage
Jan 2021 - Jan 2023
Backstage is an open framework for building developer portals
Role in this project:Back-end Developer
Back-end DeveloperContributions:2465 reviews, 2592 commits, 1408 PRs in 2 years
Contributions summary:Johan Haals primarily focused on enhancing the catalog backend within the Backstage project. Their contributions involved reducing the public API surface of the catalog-backend, removing outdated labels in the microsite, and fixing tests within the catalog-graph plugin. They also added support for lifecycle events. Furthermore, they updated dependencies and made changes to the search and catalog-backend plugins.
backstageinfrastructuredxdeveloper-experiencedeveloper-portal
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