Developer Summit

October 13-17, 2025 • Technical Deep-Dives • ~20 Participants Expected

Focus Areas

  • Variable Chunk Grids: Finalize extension definition and prototype implementation
  • Sharding: Complete design and demonstrate high-throughput distributed I/O
  • Codec Standardization: Stabilize specifications for image compression routines
  • Cross-Language Support: Ensure compatibility and feature parity across Python, C++, Rust, JavaScript

Represented groups

  • Zarr steering council
  • Zarr-Python
  • Zarrs
  • GDAL
  • Zarr.jl
  • Numcodecs
  • AnnData
  • VirtualiZarr
  • Acquire-Zarr
  • Icechunk
  • Zarr-sparse
  • Cubed
  • Nvcomp
  • Viv
  • AnnData
  • Xarray
  • ...and more!

We want to connect with you! Reach out if you have any questions!

Why This In-Person Format Matters

Complex technical challenges require high-bandwidth communication. The Zarr community's current barriers can only be overcome through intensive, in-person collaboration. Time zone differences, competing priorities, and the limitations of asynchronous communication have created a deadlock where critical decisions remain unmade month after month.

This summit will transform months of asynchronous debate into days of productive problem-solving, enabling the real-time discussions necessary to resolve technical disagreements and build the trust essential for a healthy open-source ecosystem.

Travel Support Available

Travel support is available for Zarr developer summit participants. Please request travel support when registering.

Register for Developer Summit (Closed)