Björn Harrtell
Senior Software Engineer at Septima
Malmo, Skåne County, Sweden
Summary
🤩
Rockstar🎓
Top SchoolBjörn Harrtell is a Senior Software Engineer based in Malmö with 16 years of experience building robust back-end systems and full‑stack features, particularly in geospatial tooling and data formats. He has driven integrations and drivers for major open-source geospatial projects (GDAL, GeoServer, GeoTools, QGIS, PostGIS) and modernized JavaScript/TypeScript code generation for Google’s FlatBuffers, showing fluency across languages and layers. At Septima he continues to apply that domain expertise to production systems, having earlier combined statistical traffic analysis and GIS consulting at Sweden’s National Road Administration and Sweco. His contributions often focus on performance, correctness and modern interoperability—e.g., adding FlatGeobuf support across multiple ecosystems and introducing TextEncoder/TextDecoder usage to modernize serialization. Colleagues rely on him for pragmatic refactors that improve API ergonomics and long-term maintainability.
16 years of coding experience
Bachelor of Computer Science, Computer Engineering, Bachelor of Computer Science, Computer Engineering at Mid Sweden University
Swedish, English, Danish
Github Skills (61)
algorithm10
algorithms10
javascript10
c-language10
postgresql10
geometry10
ogr10
qgis10
geoserver10
wfs10
gdal10
typescript10
vector-database10
data-serialization10
geospatial10
Programming languages (21)
Github contributions (5)
google/flatbuffers
May 2019 - Jan 2023
FlatBuffers: Memory Efficient Serialization Library
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:62 reviews, 23 commits, 49 PRs in 3 years 8 months
Contributions summary:Björn primarily contributed to the JavaScript/TypeScript code generation aspects of the FlatBuffers library, specifically focusing on size prefix support. They worked on code generation, added and fixed size-prefixed tests, and addressed review comments. The user also modernized TypeScript/JavaScript support and introduced the use of TextEncoder/TextDecoder for string handling, enhancing the library's compatibility with modern JavaScript and TypeScript features. Furthermore, the user made several contributions to improve the codebase, including fixing code and adding a Rollup configuration for iife bundles.
rpcmemorypythonmarshallingprotobuf
locationtech/jts
Jan 2016 - May 2020
The JTS Topology Suite is a Java library for creating and manipulating vector geometry.
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 reviews, 28 commits, 39 PRs in 4 years 4 months
Contributions summary:Björn primarily refactored and improved the JTS Topology Suite library's core geometry classes. Their commits focused on refactoring the `Geometry` class, introducing `copy` methods and deprecating `clone`, which indicates a focus on improving object handling and memory management. Furthermore, they updated and refactored the implementation of the `Comparable` interface for geometry classes to reduce dependencies and improved the overall design of the classes within the library. The user's work highlights their expertise in improving the JTS Topology Suite library.
vectorgisgeometric-algorithmscomputational-geometrytriangulation
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