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Kacper Rączy

PROFILE

Kacper Rączy

G.F.W. Kra developed and enhanced advanced automotive software features for the commaai/openpilot repository, focusing on robust data handling, real-time sensor fusion, and machine learning-driven control systems. Over ten months, Kra delivered resilient data pipelines, improved calibration and localization through Kalman filtering, and integrated ONNX-based model updates to support safer autonomous driving. Using Python, C++, and Cap’n Proto, Kra refactored core modules for reliability, introduced parameter management improvements, and streamlined build automation. The work demonstrated depth in backend and embedded systems, with careful attention to testing, diagnostics, and maintainability, resulting in more reliable, observable, and adaptable vehicle software infrastructure.

Overall Statistics

Feature vs Bugs

77%Features

Repository Contributions

82Total
Bugs
11
Commits
82
Features
37
Lines of code
3,690
Activity Months10

Work History

September 2025

2 Commits • 2 Features

Sep 1, 2025

September 2025: Two focused feature improvements across commaai/new-connect and commaai/openpilot delivering clearer route data and deeper live torque debugging. No critical bugs fixed in scope this month; all changes were small, well-scoped commits enabling safer rollout and faster operator insight.

August 2025

1 Commits • 1 Features

Aug 1, 2025

August 2025 monthly summary for developer work on commaai/openpilot. Delivered a focused enhancement to the Process Replay feature by integrating LiveParametersV2 for custom parameters, significantly improving data handling fidelity and enabling more flexible parameter experimentation. No major bugs fixed were documented this month. Overall impact includes improved replay accuracy for diagnostics and testing, faster iteration on parameter tuning, and stronger support for parameterized scenarios in openpilot. Technologies/skills demonstrated include LiveParametersV2 integration, replay/data flow understanding, version-controlled changes in a high-visibility open-source project, and disciplined change-management aligned with repository standards.

July 2025

2 Commits • 1 Features

Jul 1, 2025

July 2025 monthly work summary for commaai/openpilot focusing on reliability, calibration visibility, and localized Kalman filter improvements. Key changes restored late-lag estimation visibility in release builds and added stationary handling for location estimation to improve filter behavior when the vehicle is stationary. These changes enhance steering lag calibration accuracy, localization robustness, and release readiness, delivering measurable business value in safety, maintenance efficiency, and product trust.

June 2025

9 Commits • 2 Features

Jun 1, 2025

June 2025 monthly summary for commaai/openpilot: delivered ML/model and data-management improvements, with a focus on ONNX-driven driving task updates, output structure consolidation, and build reliability enhancements.

May 2025

22 Commits • 6 Features

May 1, 2025

May 2025 — Delivered key features and fixes across openpilot with tangible business value: more reliable online lag learning, robust parameter management, improved build reproducibility, and streamlined model/vision pipelines. Highlights include implementing online lag learning with a working model and tests, fixing lag parameter mismatch by ensuring saved parameters are removed on mismatch, establishing build/target configuration for reproducible builds, integrating Capnp car interface handling, updating the Vision Model to remove unneeded outputs for efficiency, restoring policy behavior, and adding testing infrastructure and 700 data-path handling.

April 2025

30 Commits • 15 Features

Apr 1, 2025

April 2025 monthly summary for commaai/openpilot: A focused month delivering safety- and reliability-centered features, stronger parameter and localization workflows, expanded test coverage, and tightened data-path correctness across subsystems. Notable work included reapplying the Online lateral lag learning feature with an initial implementation and subsequent reapplication to restore functionality, and enhancing paramsd with cache restore and backwards-compatibility tests. Also, Calibrationd began reading carParams from Params to ensure parameter consistency, Locationd’s pose_kf was updated to inherit from KalmanFilter for improved localization, and critical data-path bugs in process_replay were fixed (GM handling and Toyota3 replacement) with GM volt removal. Additional progress included tooling and maintenance improvements to support robust releases."

March 2025

5 Commits • 3 Features

Mar 1, 2025

March 2025 monthly performance summary for commaai/openpilot focusing on delivering business value through robust data handling, calibration robustness, migration reliability, and parameter management. The month emphasizes refactoring, safer pipelines, and improved initialization to enhance reliability and throughput across critical subsystems.

February 2025

5 Commits • 4 Features

Feb 1, 2025

February 2025 focused on delivering robust data handling, safety-focused diagnostics, and cross-repo compatibility improvements across Openpilot, OpenDBC, and Panda. Deliverables enhanced data reliability, safety monitoring, and hardware compatibility while laying groundwork for more trustworthy analytics and debugging across vehicle software stacks.

January 2025

5 Commits • 2 Features

Jan 1, 2025

January 2025 performance summary for commaai/openpilot focused on delivering robust data ingestion, improved data processing resilience, and enhanced observability. Key work centered on integrating filesystem path handling for data ingestion, hardening migration/event data processing, and improving location data reliability and diagnostics.

November 2024

1 Commits • 1 Features

Nov 1, 2024

November 2024 monthly summary for commaai/openpilot: Implemented Sensor Data Processing Resilience Improvement to harden timing spikes in location data processing, boosting reliability of locationd and sensor data handling. This work reduces intermittent data latency and strengthens downstream sensor fusion, contributing to safer and more dependable ADAS capabilities.

Activity

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Quality Metrics

Correctness89.2%
Maintainability87.8%
Architecture87.6%
Performance87.6%
AI Usage25.4%

Skills & Technologies

Programming Languages

C++Cap'n ProtoONNXPythonTypeScriptYAMLcapnponnx

Technical Skills

AIAI developmentAI integrationAI model integrationAlert System ImplementationAutomotive SoftwareAutomotive Software DevelopmentAutonomous SystemsC++C++ programmingCI/CDCap'n ProtoCommand Line InterfaceData HandlingData Parsing

Repositories Contributed To

4 repos

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

commaai/openpilot

Nov 2024 Sep 2025
10 Months active

Languages Used

PythonCap'n ProtoC++ONNXcapnpYAMLonnx

Technical Skills

Python programmingalgorithm designsensor data processingtestingPythonback end development

commaai/opendbc

Feb 2025 Feb 2025
1 Month active

Languages Used

Python

Technical Skills

Automotive SoftwareEmbedded Systems

commaai/panda

Feb 2025 Feb 2025
1 Month active

Languages Used

Python

Technical Skills

Python DevelopmentTesting

commaai/new-connect

Sep 2025 Sep 2025
1 Month active

Languages Used

TypeScript

Technical Skills

Frontend DevelopmentTypeScript

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