LedgerHQ/ledger-secure-sdk
Dec 2024 – Jan 2026
11 Months active
Languages Used
CMakefileC++
Technical Skills
Embedded DevelopmentFirmware DevelopmentUI DevelopmentBuild SystemsC ProgrammingUnit Testing
Julian Arevalo
PROFILE
Julian Arevalo
Julian Arevalo contributed to the LedgerHQ/ledger-secure-sdk repository, focusing on embedded systems and firmware development using C and C++. Over eleven months, Julian delivered features and fixes that improved device reliability, security, and maintainability. He enhanced protocol robustness across BLE, NFC, and USB interfaces, implemented CRC-based data integrity checks, and refactored memory management for safer buffer handling. His work included API design, system call cleanup, and localization support, enabling future multi-language features. Julian also strengthened unit testing infrastructure with CMake and sanitizer integration, ensuring code quality. His engineering demonstrated depth in low-level programming, security best practices, and cross-interface consistency.
Overall Statistics
Feature vs Bugs
76%Features
Repository Contributions
68Total
Bugs
7
Commits
68
Features
22
Lines of code
5,984
Activity Months11
Your Network
146 people
Work History
January 2026
8 Commits • 3 Features
Jan 1, 2026Month: 2026-01 for LedgerHQ/ledger-secure-sdk focused on stability improvements, API cleanups, and groundwork for multi-language support. Delivered targeted fixes and refactors to reduce risk, streamline maintenance, and prepare for future features while preserving business value for cryptographic operations and endorsement workflows.
8 Commits • 3 Features
Jan 1, 2026Month: 2026-01 for LedgerHQ/ledger-secure-sdk focused on stability improvements, API cleanups, and groundwork for multi-language support. Delivered targeted fixes and refactors to reduce risk, streamline maintenance, and prepare for future features while preserving business value for cryptographic operations and endorsement workflows.
January 2026
December 2025
9 Commits • 1 Features
Dec 1, 2025December 2025 Monthly Summary for LedgerHQ/ledger-secure-sdk focusing on delivered features, critical fixes, impact, and skills demonstrated.
December 2025
9 Commits • 1 Features
Dec 1, 2025December 2025 Monthly Summary for LedgerHQ/ledger-secure-sdk focusing on delivered features, critical fixes, impact, and skills demonstrated.
November 2025
2 Commits • 2 Features
Nov 1, 2025Month: 2025-11 focused on delivering forward-looking features in LedgerHQ/ledger-secure-sdk and improving code quality to enable future extensions and increased stability. Delivered two primary features: Endorsement Feature (Header Refactor and Type Safety) and Syscall ID Reservation Enhancement. These changes strengthen correctness, extendability, and security readiness of the SDK. A small cleanup commit contributed to endorsement header quality. No distinct major bug fixes were reported this month; effort concentrated on robust feature delivery and groundwork for scalable ID management.
2 Commits • 2 Features
Nov 1, 2025Month: 2025-11 focused on delivering forward-looking features in LedgerHQ/ledger-secure-sdk and improving code quality to enable future extensions and increased stability. Delivered two primary features: Endorsement Feature (Header Refactor and Type Safety) and Syscall ID Reservation Enhancement. These changes strengthen correctness, extendability, and security readiness of the SDK. A small cleanup commit contributed to endorsement header quality. No distinct major bug fixes were reported this month; effort concentrated on robust feature delivery and groundwork for scalable ID management.
November 2025
September 2025
4 Commits • 1 Features
Sep 1, 2025September 2025 summary for LedgerHQ/ledger-secure-sdk: Delivered a robust App Storage Initialization and Integrity Verification feature with CRC-based corruption detection, returning explicit status codes for init and init checks. Implemented conditional app_storage initialization in common startup when HAVE_APP_STORAGE is defined. Strengthened quality through enhanced unit tests with address/undefined sanitizers. This work improves data integrity, startup reliability, and security posture, enabling safer storage handling and clearer operational signals for upstream components.
September 2025
4 Commits • 1 Features
Sep 1, 2025September 2025 summary for LedgerHQ/ledger-secure-sdk: Delivered a robust App Storage Initialization and Integrity Verification feature with CRC-based corruption detection, returning explicit status codes for init and init checks. Implemented conditional app_storage initialization in common startup when HAVE_APP_STORAGE is defined. Strengthened quality through enhanced unit tests with address/undefined sanitizers. This work improves data integrity, startup reliability, and security posture, enabling safer storage handling and clearer operational signals for upstream components.
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for LedgerHQ/ledger-secure-sdk focusing on App Storage Unit Tests Infrastructure Enhancement. Key changes fixed CMake configuration, cleaned up build process, added mock CRC, and updated test linking to improve reliability and maintainability of app_storage unit tests. These changes reduce test flakiness, accelerate CI feedback, and enable safer future refactors in the app_storage module. Commit FWEO-1481 references the work; primary commit 8771c30dfcc490a94d17d54f6dfb314e41ec6887.
1 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for LedgerHQ/ledger-secure-sdk focusing on App Storage Unit Tests Infrastructure Enhancement. Key changes fixed CMake configuration, cleaned up build process, added mock CRC, and updated test linking to improve reliability and maintainability of app_storage unit tests. These changes reduce test flakiness, accelerate CI feedback, and enable safer future refactors in the app_storage module. Commit FWEO-1481 references the work; primary commit 8771c30dfcc490a94d17d54f6dfb314e41ec6887.
August 2025
July 2025
7 Commits • 3 Features
Jul 1, 2025Monthly summary for 2025-07: Ledger-secure-sdk delivered security hardening, reliability, and build-system improvements across BLE, U2F, USB, and UI components, translating into tangible business value through reduced risk, improved stability, and easier future maintenance.
July 2025
7 Commits • 3 Features
Jul 1, 2025Monthly summary for 2025-07: Ledger-secure-sdk delivered security hardening, reliability, and build-system improvements across BLE, U2F, USB, and UI components, translating into tangible business value through reduced risk, improved stability, and easier future maintenance.
June 2025
20 Commits • 6 Features
Jun 1, 2025June 2025 performance summary for LedgerHQ/ledger-secure-sdk focusing on cross-interface robustness, data integrity, and maintainability. Highlights include NFC parsing validation, BLE safety improvements, API consistency, memory-management refactor, and CRC32 integration. These changes reduce risk in day-to-day device interactions and improve developer efficiency.
20 Commits • 6 Features
Jun 1, 2025June 2025 performance summary for LedgerHQ/ledger-secure-sdk focusing on cross-interface robustness, data integrity, and maintainability. Highlights include NFC parsing validation, BLE safety improvements, API consistency, memory-management refactor, and CRC32 integration. These changes reduce risk in day-to-day device interactions and improve developer efficiency.
June 2025
May 2025
13 Commits • 3 Features
May 1, 2025In May 2025, Ledger Secure SDK delivered a set of reliability, safety, and memory-management improvements across BLE, NFC, and protocol interfaces. Key outcomes include hardened BLE state machine with MTU validation, memory-safe protocol data handling, stricter NFC transitions, and comprehensive boundary checks across data paths, delivering higher reliability, lower risk of crashes, and easier maintenance.
May 2025
13 Commits • 3 Features
May 1, 2025In May 2025, Ledger Secure SDK delivered a set of reliability, safety, and memory-management improvements across BLE, NFC, and protocol interfaces. Key outcomes include hardened BLE state machine with MTU validation, memory-safe protocol data handling, stricter NFC transitions, and comprehensive boundary checks across data paths, delivering higher reliability, lower risk of crashes, and easier maintenance.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary focusing on code quality improvements in LedgerHQ/ledger-secure-sdk. Delivered a non-functional code cleanliness cleanup that removes an unused declaration, contributing to maintainability and safer refactoring.
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary focusing on code quality improvements in LedgerHQ/ledger-secure-sdk. Delivered a non-functional code cleanliness cleanup that removes an unused declaration, contributing to maintainability and safer refactoring.
April 2025
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 (2025-02) monthly summary for LedgerHQ/ledger-secure-sdk focused on strengthening test infrastructure and preparing for scalable CI. No major bugs fixed this month. Key delivery: moved cx_chacha unit tests to a dedicated test file, introducing a conditional compile pattern using STATIC to enable test code only under UNIT_TESTING. This refactor removes unit tests from the production cx_chacha.c source, reducing production footprint and improving CI reliability. Impact: cleaner production code, faster release builds, and a more maintainable test suite. Commit reference: 9500c48781d3658d118067c74df8e4088731354e.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 (2025-02) monthly summary for LedgerHQ/ledger-secure-sdk focused on strengthening test infrastructure and preparing for scalable CI. No major bugs fixed this month. Key delivery: moved cx_chacha unit tests to a dedicated test file, introducing a conditional compile pattern using STATIC to enable test code only under UNIT_TESTING. This refactor removes unit tests from the production cx_chacha.c source, reducing production footprint and improving CI reliability. Impact: cleaner production code, faster release builds, and a more maintainable test suite. Commit reference: 9500c48781d3658d118067c74df8e4088731354e.
December 2024
2 Commits
Dec 1, 2024December 2024 monthly summary for LedgerHQ/ledger-secure-sdk: Delivered targeted keypad reliability improvements for Nanos keypad input during PIN entry. Two critical fixes addressed backspace behavior and keypad initialization to ensure accurate, predictable user input and prevent unintended key presses. This work enhances user experience, reduces risk of incorrect PIN entries, and strengthens security UX across devices.
2 Commits
Dec 1, 2024December 2024 monthly summary for LedgerHQ/ledger-secure-sdk: Delivered targeted keypad reliability improvements for Nanos keypad input during PIN entry. Two critical fixes addressed backspace behavior and keypad initialization to ensure accurate, predictable user input and prevent unintended key presses. This work enhances user experience, reduces risk of incorrect PIN entries, and strengthens security UX across devices.
December 2024
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Quality Metrics
Correctness91.2%
Maintainability89.0%
Architecture86.8%
Performance85.2%
AI Usage20.8%
Skills & Technologies
Programming Languages
CC++Makefile
Technical Skills
API DesignAPI designBluetooth Low EnergyBluetooth Low Energy (BLE)Bug FixingBuild System ManagementBuild SystemsC ProgrammingC programmingC++CMakeCode CleanupCode FormattingCompiler WarningsCryptography
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