April 2025 focused on stabilizing focal-plane projection workflows in sotodlib. Delivered a critical bug fix for the FocalPlane projection signature in get_nearby_sources by using the correct so3g.proj.FocalPlane.from_xieta() data format, preventing coordinate transformation errors during nearby-source calculations. This addressed a stale signature from an imperfect upgrade and is tracked in commit e73fc8dd36e961fdc2862371a09390dd20feda33. Impact includes more reliable nearby-source computations, improved data quality for downstream analyses, and reduced risk of regression in future upgrades. Key KPIs: faster issue resolution, decreased coordinate-related errors in projections, and clearer upgrade-path traceability. Skills demonstrated include Python debugging, cross-library API compatibility, and regression testing across the data processing pipeline.