The-OpenROAD-Project/OpenROAD
Jan 2025 – Oct 2025
9 Months active
Languages Used
C++DEFDefUnknownBUILDTcl
Technical Skills
Code RefactoringDocumentationC++C++ DevelopmentCMakeCode Readability
João Mai
PROFILE
João Mai
Jian Mai contributed to The-OpenROAD-Project/OpenROAD by engineering advanced macro placement and clustering features for VLSI design automation. Over nine months, Jian refactored and optimized C++ code to improve macro snapping, clustering stability, and simulated annealing convergence, addressing both algorithmic accuracy and code maintainability. He enhanced the Snapper and clustering engines, introduced robust error handling, and expanded test coverage to ensure reliability in large-scale chip layouts. Jian’s work included integrating Boost.Polygon support, refining build system configuration with CMake, and maintaining code hygiene through formatting and documentation. These efforts delivered scalable, maintainable solutions that improved placement quality and developer productivity.
Overall Statistics
Feature vs Bugs
80%Features
Repository Contributions
113Total
Bugs
7
Commits
113
Features
28
Lines of code
27,872
Activity Months9
Your Network
84 people
Work History
October 2025
6 Commits • 3 Features
Oct 1, 2025Month: 2025-10 — The OpenROAD MPL work focused on enabling new capabilities, improving design correctness for tight designs, and enhancing code hygiene to support faster iteration and robust builds in The-OpenROAD-Project/OpenROAD.
6 Commits • 3 Features
Oct 1, 2025Month: 2025-10 — The OpenROAD MPL work focused on enabling new capabilities, improving design correctness for tight designs, and enhancing code hygiene to support faster iteration and robust builds in The-OpenROAD-Project/OpenROAD.
October 2025
September 2025
35 Commits • 13 Features
Sep 1, 20252025-09 Monthly Summary for The-OpenROAD-Project/OpenROAD. Focused on delivering robust MPL improvements, API stability, and code quality enhancements to enable more scalable floorplanning, reduce risk, and accelerate development cycles.
September 2025
35 Commits • 13 Features
Sep 1, 20252025-09 Monthly Summary for The-OpenROAD-Project/OpenROAD. Focused on delivering robust MPL improvements, API stability, and code quality enhancements to enable more scalable floorplanning, reduce risk, and accelerate development cycles.
August 2025
18 Commits • 3 Features
Aug 1, 2025August 2025 monthly summary for The-OpenROAD-Project/OpenROAD focusing on macro placement enhancements, SA-based convergence improvements, and codebase hygiene. Deliverables emphasize business value through improved placement quality, faster convergence for large macro arrays, and maintainable code with regression coverage.
18 Commits • 3 Features
Aug 1, 2025August 2025 monthly summary for The-OpenROAD-Project/OpenROAD focusing on macro placement enhancements, SA-based convergence improvements, and codebase hygiene. Deliverables emphasize business value through improved placement quality, faster convergence for large macro arrays, and maintainable code with regression coverage.
August 2025
July 2025
11 Commits • 4 Features
Jul 1, 2025July 2025 - The-OpenROAD-Project/OpenROAD: Delivered key features and reliability improvements to placement and macro handling. Implemented improved cluster detection for large flat clusters via the isLargeFlatCluster helper, and stabilized macro perturbation state management in the SA core and SACore to prevent state inconsistencies. Refined notch penalty calculation in SACoreSoftMacro to better optimize macro placement. Built a foundation for maintainability with code quality improvements including formatting, test updates, and build/test parameter tweaks. Fixed a critical bug: inconsistent restore during macro perturbations, reducing risk of erroneous simulations and improving robustness. These changes deliver more accurate, reliable placements, faster iteration, and stronger code quality, translating to tangible business value.
July 2025
11 Commits • 4 Features
Jul 1, 2025July 2025 - The-OpenROAD-Project/OpenROAD: Delivered key features and reliability improvements to placement and macro handling. Implemented improved cluster detection for large flat clusters via the isLargeFlatCluster helper, and stabilized macro perturbation state management in the SA core and SACore to prevent state inconsistencies. Refined notch penalty calculation in SACoreSoftMacro to better optimize macro placement. Built a foundation for maintainability with code quality improvements including formatting, test updates, and build/test parameter tweaks. Fixed a critical bug: inconsistent restore during macro perturbations, reducing risk of erroneous simulations and improving robustness. These changes deliver more accurate, reliable placements, faster iteration, and stronger code quality, translating to tangible business value.
June 2025
5 Commits
Jun 1, 2025June 2025: Focused stability and correctness improvements in MPL cluster handling and tiling workflows for The OpenROAD project. Delivered targeted bug fixes that improve correctness (ClusterEngine) and visibility (tiling error reporting), resulting in more reliable layout processing, earlier failure detection, and easier debugging. Demonstrated proficiency in C++ refactoring, logging, and test maintenance, with measurable business value through reduced production risk and clearer, maintainable code paths.
5 Commits
Jun 1, 2025June 2025: Focused stability and correctness improvements in MPL cluster handling and tiling workflows for The OpenROAD project. Delivered targeted bug fixes that improve correctness (ClusterEngine) and visibility (tiling error reporting), resulting in more reliable layout processing, earlier failure detection, and easier debugging. Demonstrated proficiency in C++ refactoring, logging, and test maintenance, with measurable business value through reduced production risk and clearer, maintainable code paths.
June 2025
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 focused on enhancing clustering with macro-awareness to improve stability, quality of clustering decisions, and observability in large designs within The OpenROAD project. The core work delivered the Advanced Clustering Engine improvements to factor macro thresholds into clustering decisions, updates to the clustering pipeline (multilevelAutocluster and updateSubTree) with max_macro checks, and refined BreakLargeFlatCluster logic for stability and correctness. Improved logging/diagnostics supports faster debugging and performance tuning across large-scale designs.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 focused on enhancing clustering with macro-awareness to improve stability, quality of clustering decisions, and observability in large designs within The OpenROAD project. The core work delivered the Advanced Clustering Engine improvements to factor macro thresholds into clustering decisions, updates to the clustering pipeline (multilevelAutocluster and updateSubTree) with max_macro checks, and refined BreakLargeFlatCluster logic for stability and correctness. Improved logging/diagnostics supports faster debugging and performance tuning across large-scale designs.
April 2025
20 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for The-OpenROAD-Project/OpenROAD. Delivered Snapper placement improvements with a focus on accuracy, robustness, and workflow stability for complex macro-based designs. Strengthened code quality and test coverage to ensure long-term reliability and maintainability.
20 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for The-OpenROAD-Project/OpenROAD. Delivered Snapper placement improvements with a focus on accuracy, robustness, and workflow stability for complex macro-based designs. Strengthened code quality and test coverage to ensure long-term reliability and maintainability.
April 2025
February 2025
15 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for The-OpenROAD-Project/OpenROAD focused on delivering a robust macro snapping capability, stabilizing snapping behavior, and expanding test coverage. The work positions the project for more reliable macro placement and faster iteration in layout flows.
February 2025
15 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for The-OpenROAD-Project/OpenROAD focused on delivering a robust macro snapping capability, stabilizing snapping behavior, and expanding test coverage. The work positions the project for more reliable macro placement and faster iteration in layout flows.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 performance summary: Focused on improving code clarity and maintainability in a critical snapping path of the OpenROAD repository, setting the stage for safer future enhancements and faster onboarding.
1 Commits • 1 Features
Jan 1, 2025January 2025 performance summary: Focused on improving code clarity and maintainability in a critical snapping path of the OpenROAD repository, setting the stage for safer future enhancements and faster onboarding.
January 2025
Activity
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Quality Metrics
Correctness89.8%
Maintainability91.2%
Architecture84.8%
Performance81.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
BUILDC++DEFDefTclUnknown
Technical Skills
Algorithm DesignAlgorithm ImplementationAlgorithm OptimizationBug FixingBuild System ConfigurationBuild SystemsC++C++ DevelopmentCMakeChip DesignClean CodeCode CleanupCode DocumentationCode FormattingCode Organization
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