March 2026 monthly summary for expo/eas-cli focusing on performance improvements and reliability for cross-platform builds and upload workflows. The team delivered two new features aimed at faster, more consistent builds across platforms and fixed a critical robustness issue in the upload pipeline. The changes are expected to reduce build times, lower CI flakiness, and improve developer productivity by delivering a more reliable end-to-end CI/CD experience for users of eas-cli. Business value highlights: - Faster feedback loops due to caching across platforms, enabling more frequent and reliable builds. - More robust upload operations, reducing retries and failures in CI pipelines. - Cross-platform consistency in build behavior and cache management, simplifying maintenance and onboarding for engineers. Commit scope overview: - Build caching enhancements across platforms and Android Gradle builds (commits 642bb6fa4d9cf062417756cfa14eb0e3a53de57d and c9cdfd1eb56986b895b18a169f1312c9354c1073). - Upload session: Robust HTTP error handling (commit b71226d90f0ea38d9695de6725e3bcd26506800b). Delivery notes: - Cross-platform build caching enabled and integrated with Android Gradle builds, including consolidation of caches across restore/save steps and aligned log paths. - Enhanced error handling in upload session to detect non-OK HTTP responses before JSON parsing, preventing crashes and improving resilience under error conditions.

February 2026 monthly summary for expo/eas-cli focusing on observability improvements and build/worker reliability. Key deliverables include enhanced error logging to Datadog, improved worker logs capturing stdout/stderr, and better error context tagging to accelerate debugging and triage across the build pipeline.

January 2026 performance-focused sprint across expo/eas-build and expo/eas-cli. Delivered cache reliability improvements, enhanced build state caching, introduced observability for cache usage, and refreshed tooling to improve performance, stability, and compatibility. These changes reduce build times, lower failure rates, and provide better telemetry for teams.

December 2025: Implemented Build Cache Statistics Insights in expo/eas-build to improve build observability and caching decisions. Introduced a new cacheStats step within build function groups, enabling collection and exposure of cache usage metrics. This lays the groundwork for data-driven caching optimizations and faster, more reliable builds. Commit 1ee8d6a2ec486178d9a60c3f5b4ea0a801e08009 documents the change (build-tools: add cacheStats step to build function groups).

November 2025: expo/eas-build focused on implementing and stabilizing Build Tools Cache Management with ccache integration. Delivered save/restore of public cache, added cache statistics logging, and reliability safeguards by performing cache operations only when ccache is installed, verified via a shell presence check.

Month: 2025-10 — Performance-focused month for expo/eas-build. Key features delivered improved build speed and reliability, while targeted bug fixes reduced build fragility and toolchain drift. Highlights include a new caching architecture, robust file hashing, and hardened error handling that lowers CI flakiness and speeds delivery to customers. Key features delivered: - Reliable Cache Key Generation and Configurable Build Cache for Android/iOS: adds package root detection for accurate lock-file hashing, configurable cache save/restore, verbose cache stats, improved error handling, and integration of ccache to speed builds. - File-Based Hashing in Build Tools (hashFiles): introduces a hashing function that computes hashes over file patterns for job outputs, with exclusion support and tests. Major bugs fixed: - Remove Automatic ccache Injection into Android Toolchain: stops auto-modifying Android CMake toolchain files to inject ccache settings, simplifying the build process and preventing unintended toolchain changes. - Graceful Handling of 404 TurtleFetch Errors During Cache Restoration: adds targeted error handling for 404 errors from TurtleFetch during cache restoration to prevent build failures and ensure proper logging. Overall impact and accomplishments: - Improved build speed and reliability via configurable caching and ccache integration; reduced build fragility and toolchain drift; better observability and logging; smoother CI workflows. Technologies/skills demonstrated: - Build tooling and caching strategies (ccache, cache key generation, save/restore workflows) - Hashing and file-pattern operations (hashFiles) with tests - Robust error handling and observability (404 handling, verbose stats) - Toolchain management for Android/iOS and integration with TurtleFetch

September 2025 (expo/eas-build): Focused on reliability and speed improvements for iOS workflows and build pipelines, delivering business value through resilient artifacts and faster CI cycles. Key features delivered: - Unified Build Caching: added restore/save cache for build-tools and iOS builds, including generation of cache keys and end-to-end archive handling (compression, upload, download, and decompression) to speed up subsequent builds. • Commits: [build-tools] restore and save cache functions (#590) (8966f796e412c2da0f2e04bf9676644f98e6dea9); [ios-builder] support save and restore ccache for builds and workflows (#599) (da7896348a443ca83c33371e4a8036f7b1948a76). Major bugs fixed: - iOS build robustness: relax the requirement for APPLICATION_ARCHIVE to allow the build to proceed when the archive artifact is missing, preventing build failures due to missing artifacts. • Commit: [ios-builder] accept null archive artifact (#588) (211a3ad91295dc6c3541d797cb03cb90e3e61d7f). Overall impact and accomplishments: - Increased reliability of iOS build pipelines and developer productivity by eliminating failures caused by missing artifacts and by reducing CI wait times through caching. - Improved resource utilization and predictability of build times across workflows, enabling faster feedback and more stable releases. Technologies/skills demonstrated: - Build-tools and iOS builder tooling, cache key design, cache lifecycle (save/restore), and artifact management. - End-to-end caching strategies across multiple subsystems, with clear traceability to commits. - Cross-repo collaboration and impact assessment for build optimizations.

August 2025: Feature delivery and impact for expo/eas-build. Major bugs fixed: none this month. Key feature: Exposed pull_request number in the build interpolation context to enable eas-build-job to access PR data during interpolation. Technical note: Extended StaticWorkflowInterpolationContextZ schema to include a pull_request object with a number field. Business value: PR-aware interpolation improves automation, build reproducibility, and traceability in PR workflows. Technologies/skills demonstrated: TypeScript schema extension, build-interpolation logic, PR data integration, and commit-based traceability (see commit d58d0de1ddf266482a9accc956fc36a9a73b25e6).

July 2025 performance summary for expo/eas-build: Delivered scalable storage enhancements to the build artifact workflow, introducing R2 as a new archive source and enabling builds to proceed without requiring an archive. These changes improve storage flexibility, pipeline resilience, and cost efficiency by leveraging R2 storage for artifacts.