April 2026 performance summary for signalapp/libsignal focused on reliability and backup capabilities. Implemented server-side upload size limits for getUploadForm, introduced a backup upload service, and bridged backup uploads to clients. These changes improve user feedback for oversized uploads, enable proper error handling for unauthorized access, and support retrieval of upload forms for message/media backups, laying groundwork for more robust backup workflows and data integrity.

March 2026 performance highlights for signalapp/libsignal. No major bugs fixed this month. Focused on delivering business value through reliable features, secure key management, cross-language interoperability, UX improvements for rate-limiting, and enhanced observability. Key features and improvements delivered: - Attachment Uploads via Upload Form Retrieval and gRPC Uploads: Exposed getUploadForm() to clients and added gRPC support for resumable uploads (c706b7f5ce62f8f3f8938080271b82a56911d573; e9ec8dd431ca886070944da6abba0bf2b0736a58). - Unauthenticated Keys Prekeys Retrieval: Added getPreKeys() client library and UnauthKeysService support (a47ba487a7ad0fcf9b014e9bb48a15b6a12a8aad). - Kotlin Native Interoperability Enhancement: Enabled kotlin.Pair getters to be called from native code (f6c4ff2e8dbaa39e245c641e32eb209a8ba2317f). - Rate Limit Retry Duration Guidance: Introduced a configurable retry-later duration indicator for rate limit challenges (0a58e80bbc312a5a628c3cf8a65cde5f2c6384d1). - Diagnostics and Logging Enhancements: Android performance tracing, enhanced gRPC failure logging, and panic backtrace logging (1ca00428e0fd2526f7e2dfac8cd2324e1ec7e28b; a7a24ed517f9784c7645b29c95fd95ed12a4066d; 400a021c2b6efb43280dcb78e2e5fdf293a03081). These changes collectively improve upload reliability, key management UX, cross-language interoperability, user feedback during rate-limiting, and system observability.

February 2026 performance summary: Delivered critical security, reliability, and developer-experience improvements across signalapp/libsignal and Signal-iOS, aligning feature delivery with business value. Key work focused on simplifying cryptographic key handling, enabling remote-config driven account existence checks, and improving error observability and build consistency. The results include faster, more secure key operations, a streamlined account verification path, better debugging capabilities, and development environment parity across platforms.

January 2026: Delivered three core initiatives in signalapp/libsignal to enhance safety, data integrity, and release efficiency. Implemented account existence checks via the Account Existence API and UnauthProfilesService, strengthened group member data integrity with a backup label validator, and optimized the release/build pipeline with a Rust upgrade and selective proto rebuilds. No critical bugs fixed this month; focus was on robustness, reliability, and faster release cycles.