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Justin Hwang

PROFILE

Justin Hwang

Justin developed embedded firmware and system integration features for the hytech-racing/VCR, VCF, and CCU repositories, focusing on vehicle control, diagnostics, and safety. He architected state machines, sensor data paths, and task scheduling frameworks using C++ and the Arduino framework, emphasizing modularity and real-time reliability. His work included implementing dual-redundant pedal systems, CAN bus communication, and automated CI/CD pipelines with PlatformIO and GitHub Actions. By refactoring codebases, centralizing configuration, and expanding unit test coverage, Justin improved maintainability and reduced regression risk. His contributions enabled safer startup sequences, robust diagnostics, and scalable sensor integration, demonstrating depth in embedded systems engineering.

Overall Statistics

Feature vs Bugs

72%Features

Repository Contributions

30Total
Bugs
7
Commits
30
Features
18
Lines of code
5,297
Activity Months6

Work History

May 2025

2 Commits • 2 Features

May 1, 2025

May 2025 monthly summary for hytech-racing/VCR focusing on key accomplishments, system safety, reliability improvements, and business value.

March 2025

4 Commits • 4 Features

Mar 1, 2025

March 2025 performance highlights: Delivered critical feature work and system integration across VCF, VCR, and CCU repositories to enhance safety, reliability, and future velocity. Key features delivered include: Pedals System (VCF) with dual-sensor redundancy, deadzone handling, and FSAE-compliant checks; VCF System Task Scheduling and Modularity Enhancements; VCR System Integration with enhanced CAN communication, inverter control, and state-machine refinements; CCU Codebase Workflow Configuration Reorganization to .github/workflows for CI/CD hygiene. No discrete major bugs fixed in this period; instead, the work focused on reducing defect risk through architecture and interface improvements. Technologies demonstrated include embedded C/C++, CAN, Ethernet, ADC, system time-aware tasking, deadzone and fault-detection logic, and CI/CD workflow automation.

February 2025

3 Commits • 2 Features

Feb 1, 2025

February 2025 monthly summary focusing on test coverage expansion, initialization correctness, and build reliability across VCR and VCF repositories. Delivered new unit tests, fixed a critical default initialization, and improved build/test configuration to reduce regressions and accelerate CI feedback.

January 2025

11 Commits • 5 Features

Jan 1, 2025

January 2025 performance summary: Delivered core platform improvements across VCR, VCF, and CCU, focusing on accurate vehicle metrics, safer startup sequencing, sensor data integration, foundational charging infrastructure, and improved development automation. Enhanced business value through more reliable dashboards, safer operation flows, scalable data collection, and an enablement layer for battery management.

December 2024

6 Commits • 3 Features

Dec 1, 2024

December 2024 monthly summary for hytech-racing/VCR. Focused on establishing a robust MCU development workflow, delivering a scalable ADC data path, and laying a CI/CD foundation to accelerate validation and reliability for future system testing.

November 2024

4 Commits • 2 Features

Nov 1, 2024

Month: 2024-11. Delivered foundational VCR work for hytech-racing/VCR and established automation-ready workflows for hardware integration. Key accomplishments: - VCR Project Initialization and Testing Infrastructure: PlatformIO scaffolding for Teensy41 plus testing infra for the task scheduler, including a VCR task header and Google Test/Mock tests (commits c35c15bd43a2f9bb9f8d93e875d116c7077190a4; 16b724bade6e4133c82617ba21c4447998a06a78). - Teensy41 Build Optimization: excluded tests from the Teensy41 build to avoid cross-environment issues (commit fe3d6828497bed2680cc6a1e5f4cec1710cf65aa). - HT_SCHED Dependency Update: updated platformio.ini to use the latest main branch of HT_SCHED, removing a fixed commit hash to ensure access to the latest stable scheduler features (commit 8f14fba0667b047dfb9327125bae221863e45e81).

Activity

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Quality Metrics

Correctness88.6%
Maintainability88.0%
Architecture87.4%
Performance81.4%
AI Usage21.4%

Skills & Technologies

Programming Languages

ArduinoBashCC++INIMarkdownYAML

Technical Skills

Arduino FrameworkC++C++ DevelopmentCAN BusCAN Bus CommunicationCI/CDCode RefactoringCode StandardizationConfigurationConfiguration ManagementEmbedded SystemsEmbedded Systems DevelopmentFMEAFirmware DevelopmentGitHub Actions

Repositories Contributed To

3 repos

Overview of all repositories you've contributed to across your timeline

hytech-racing/VCR

Nov 2024 May 2025
6 Months active

Languages Used

C++INIMarkdownYAMLC

Technical Skills

C++Embedded SystemsEmbedded Systems DevelopmentFirmware DevelopmentGoogle MockGoogle Test

hytech-racing/VCF

Jan 2025 Mar 2025
3 Months active

Languages Used

CC++INIYAMLBash

Technical Skills

C++CI/CDConfiguration ManagementEmbedded SystemsFirmware DevelopmentGitHub Actions

hytech-racing/CCU

Jan 2025 Mar 2025
2 Months active

Languages Used

ArduinoC++

Technical Skills

Arduino FrameworkC++Embedded SystemsFirmware Development

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