February 2026 monthly summary highlighting feature delivery, stability fixes, and strategic refactors across LedgerHQ apps. Focused on enabling richer data handling, safer memory management, and expanded Ethereum support, with an emphasis on business value, reliability, and test coverage.

January 2026 focused on strengthening core data structures, expanding APIs for data manipulation, and elevating reliability and test coverage across LedgerHQ repositories. Key outcomes include enabling richer list operations in the Ethereum app, foundational upgrades to doubly linked lists for core data structures, robust handling of GCS batched transactions with empty TX support, and major refactors to trusted names and enum handling for safer, extensible state management. In parallel, critical bug fixes and quality improvements reduced crash risk and improved maintainability, delivering measurable business value through more flexible processing, safer state transitions, and enhanced developer tooling.

December 2025 monthly summary focusing on delivering robust feature work, expanding test coverage, and aligning branding, with notable architectural improvements in the internal plugin system and ERC-20 data handling. Key technical work spanned the app-ethereum and ledger-app-database repos, emphasizing performance, reliability, and business value.

November 2025: Delivered reliability, coverage, and configurability improvements for LedgerHQ/app-ethereum. Strengthened automated testing for ERC-20 flows, stabilized the Ragger test suite, hardened fuzzing builds, and improved correctness and security of critical transaction paths. These changes reduce risk in live deployments, accelerate QA feedback, and enable more flexible plugin behavior and trusted name management.

October 2025 monthly summary for LedgerHQ/ledger-secure-sdk: Focused on stabilizing Linux builds and strengthening cross-platform reliability. Key deliverable: Linux build CPU target fix implemented by updating Makefile.defines from cortex-m0plus to cortex-m3 to ensure the correct processor is targeted for Linux builds. Change recorded in commit fa4e19baf87ee881528d4f9d51ef63ecb16213d9 with message 'Fixed the CPU target for LNX'. Local and CI validation confirm Linux builds now compile against the correct CPU target, reducing build failures and downstream issues. Overall impact: improved build stability, faster iteration cycles, and clearer processor targeting in the build system. Technologies/skills demonstrated: Makefile configuration, embedded target management, Linux build processes, Git-based change management, and cross-platform debugging.

September 2025 highlights two major feature deliveries in LedgerHQ/ledger-app-database: Apex device support expansion for Nervos and Zcash configurations, and App-ethereum configuration cleanup. These changes improve device compatibility, streamline configuration management, and set the stage for faster builds and easier maintenance. No explicit bug fixes were reported this month; the focus was on configuration and device support.

August 2025 – LedgerHQ/app-ethereum: Key feature deliveries, critical bug fixes, and security/stability improvements focused on EIP-712 signing, proxy PKI handling, and GCS robustness. The work strengthens end-to-end signing reliability, hardens security boundaries, and improves memory management, supporting safer user interactions and more stable releases.

July 2025 monthly summary for LedgerHQ/app-ethereum focusing on business value, reliability, security, and platform readiness. The month delivered targeted improvements across build reliability, security hardening, contract compliance, device support, and developer experience. These efforts reduce risk in CI, improve customer trust, and accelerate release readiness.

June 2025 monthly summary for LedgerHQ/ledger-app-database: Delivered foundational Sonic Algorithm Clone integration and established groundwork for cryptographic/data processing capabilities, setting the stage for future algorithm integrations and expanded data-processing features. The work enhances extensibility and readiness for cryptographic workloads, with a clear path to broader algorithm deployment.

May 2025 monthly summary focusing on delivered features and fixes across two LedgerHQ repositories, emphasizing business value, stability, and performance improvements. Key context: LedgerHQ/ledger-secure-sdk delivered a critical memory allocation dead-code warning fix; LedgerHQ/speculos delivered startup-performance enhancements through lazy-loading of the sound subsystem. Both changes preserve existing behavior while improving maintainability and observability.

April 2025 (LedgerHQ/ledger-secure-sdk): Delivered baremetal ARM clang runtime builtins support. Updated the build system to link clang's runtime, added an automation script to build clang rt builtins, and introduced a CI workflow to trigger builtins across architectures. Improved portability by removing libgcc dependency for baremetal targets, reduced manual steps, and accelerated cross-arch development.

March 2025 monthly summary: Across LedgerHQ repositories, delivered stability, updated feature flags for Ethereum compatibility, and migrated GUI to PyQt6. Key refactors and documentation updates completed to align with platform changes and network updates. Highlights include suppression of unused catch warnings in ledger-secure-sdk with no runtime impact, Ethereum flag updates in ledger-app-database, and a PyQt6 migration in speculos with related changelog and docs updates. These changes improve maintainability, future-proofing against Ethereum evolutions, and modernize the UI stack.

February 2025 performance snapshot for LedgerHQ/ledger-secure-sdk focused on consolidating build configurations and stabilizing the LNS/nanos build flows to improve reliability and device support. Delivered key features that reduce duplication, enforce toolchain consistency, and tighten linker correctness across targets, enabling faster development cycles and safer device builds.

In January 2025, delivered notable build-system improvements for LedgerHQ/ledger-secure-sdk to enhance reliability across environments and toolchains. Key changes consolidated and hardened the build process, focusing on cross-compiler compatibility and LLVM transitions. Implemented a fallback GCC sysroot path for Debian-based systems, unified optimization/debug level handling in Makefile.defines, and applied a temporary compatibility workaround to reduce DBG_LVL issues with LLVM 14+. These changes reduced environment-specific build failures, streamlined CI, and accelerated feature delivery.

December 2024 monthly summary for LedgerHQ/app-ethereum focused on expanding APDU/TLV handling, extending GTP parameter and field support, and improving reliability, tests, and developer experience. The work delivered richer transaction data encoding/decoding, safer blind-signing UX, and improved interoperability with Ethereum apps, underpinning secure wallet workflows and faster integration for partners.

November 2024 monthly summary for LedgerHQ engineering. Delivered modernization and groundwork across two repos: ledger-app-database and ledger-secure-sdk. Focused on dependency refactor, IoTeX curve enablement, and data model mutations to support future extensibility. Business value includes improved compatibility, readiness for feature expansion, and maintainability.

October 2024 monthly summary for LedgerHQ/app-ethereum focusing on Sign Transaction Engine improvements and security. Delivered modularized signing workflow enhancements with RAM-based calldata management, robust error handling, and store-mode safeguards. Implemented groundwork for TLV parsing and unified RAPDU response timing, improving security, reliability, and performance in the hardware wallet environment.