KIT-CMS/CROWN
Feb 2025 – Feb 2026
11 Months active
Languages Used
C++CMakePythonRSTShellreStructuredTextrstc++
Technical Skills
Backend DevelopmentC++C++ DevelopmentCode FormattingCode RefactoringConfiguration Management
nshadskiy
PROFILE
Nshadskiy
Nikita Shadskiy contributed to the KIT-CMS/CROWN repository by engineering and maintaining core backend features for high energy physics data analysis. Over 11 months, Nikita refactored and modernized C++ and Python workflows, improving compatibility with evolving NanoAOD data formats and integrating advanced physics corrections such as scale factors, reweighting, and jet energy corrections. Their work included robust build system updates using CMake and Docker, expanded unit testing, and enhanced documentation to streamline onboarding and reproducibility. By addressing both feature development and bug fixes, Nikita ensured the codebase remained maintainable, scalable, and reliable for complex scientific computing and collaborative analysis.
Overall Statistics
Feature vs Bugs
73%Features
Repository Contributions
166Total
Bugs
19
Commits
166
Features
51
Lines of code
111,614
Activity Months11
Your Network
49 people
Work History
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for KIT-CMS/CROWN. Focused on stabilizing data-analysis workflows under ROOT framework changes and improving user guidance. Highlights include a robustness fix for zero-event datasets in RDataFrame and documentation enhancements for the Correction Manager and CMS analysis corrections. These efforts reduced risk of empty outputs, improved onboarding, and reinforced code quality.
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for KIT-CMS/CROWN. Focused on stabilizing data-analysis workflows under ROOT framework changes and improving user guidance. Highlights include a robustness fix for zero-event datasets in RDataFrame and documentation enhancements for the Correction Manager and CMS analysis corrections. These efforts reduced risk of empty outputs, improved onboarding, and reinforced code quality.
February 2026
January 2026
6 Commits • 2 Features
Jan 1, 2026January 2026 – KIT-CMS/CROWN: Delivered two feature updates to tau physics workflows, with targeted bug fixes, refactoring, and documentation improvements. Key impact includes improved Monte Carlo tau energy scale corrections (fixing variation order inconsistency and clarifying parameters) and a streamlined tau embedding workflow via a new embedding scale-factor function and removal of redundant/outdated paths. These changes enhance MC accuracy, reduce technical debt, and simplify future maintenance, enabling more robust tau analyses and faster iteration.
January 2026
6 Commits • 2 Features
Jan 1, 2026January 2026 – KIT-CMS/CROWN: Delivered two feature updates to tau physics workflows, with targeted bug fixes, refactoring, and documentation improvements. Key impact includes improved Monte Carlo tau energy scale corrections (fixing variation order inconsistency and clarifying parameters) and a streamlined tau embedding workflow via a new embedding scale-factor function and removal of redundant/outdated paths. These changes enhance MC accuracy, reduce technical debt, and simplify future maintenance, enabling more robust tau analyses and faster iteration.
December 2025
5 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for KIT-CMS/CROWN: Key features delivered include Z boson pT reweighting enhancements with a new pT reweighting function, removal of the old ZPtWeight, and envelope-based total uncertainty handling. Recoil corrections for bosons were enhanced to Run3-ready status, with refined evaluation of Upara and Uperp and improved logging for debugging. A code cleanliness fix in MetSystematic class was completed to improve maintainability. These efforts yield more accurate physics reweighting, robust uncertainty propagation, and a cleaner, more maintainable codebase, enabling faster iteration and more reliable results for physics analyses.
5 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for KIT-CMS/CROWN: Key features delivered include Z boson pT reweighting enhancements with a new pT reweighting function, removal of the old ZPtWeight, and envelope-based total uncertainty handling. Recoil corrections for bosons were enhanced to Run3-ready status, with refined evaluation of Upara and Uperp and improved logging for debugging. A code cleanliness fix in MetSystematic class was completed to improve maintainability. These efforts yield more accurate physics reweighting, robust uncertainty propagation, and a cleaner, more maintainable codebase, enabling faster iteration and more reliable results for physics analyses.
December 2025
November 2025
19 Commits • 2 Features
Nov 1, 2025Month: 2025-11 | KIT-CMS/CROWN – concise monthly summary highlighting delivered features, stability improvements, and physics analysis capabilities. Two feature streams drove the month: CI/build/stability around ONNX/ROOT integration and Advanced physics analysis features (rapidity, MET, triggers, Haa analysis).
November 2025
19 Commits • 2 Features
Nov 1, 2025Month: 2025-11 | KIT-CMS/CROWN – concise monthly summary highlighting delivered features, stability improvements, and physics analysis capabilities. Two feature streams drove the month: CI/build/stability around ONNX/ROOT integration and Advanced physics analysis features (rapidity, MET, triggers, Haa analysis).
August 2025
12 Commits • 3 Features
Aug 1, 20252025-08 KIT-CMS/CROWN: Core feature deliveries span NanoAOD integration, Fat Jet analysis, and JES/JER infrastructure. NanoAOD run configurations for NanoAODv15_run3 and NanoAODv9_run2 were added, including new L1 trigger definitions and scripts/docs to integrate the latest nanoAOD branches, alongside dependency updates and quality improvements. Fat Jet Analysis Enhancements introduced b-jet energy regression, ParticleNet vs QCD scoring, and N-subjettiness calculations with Run2/Run3 applicability guidance. Jet Energy Corrections and Seeding workflow expanded with a JetPtSmearingSeed producer; PtCorrectionMC signature updated and PtCorrectionBJets refactored for clarity. Several commits focused on code quality and documentation, addressing review feedback and docstring fixes. Overall impact: improved Run3 readiness, higher fidelity jet reconstruction and analyses, and stronger maintainability. Technologies/skills demonstrated: C++, Python scripting, run configuration management, documentation, and dependency maintenance.
12 Commits • 3 Features
Aug 1, 20252025-08 KIT-CMS/CROWN: Core feature deliveries span NanoAOD integration, Fat Jet analysis, and JES/JER infrastructure. NanoAOD run configurations for NanoAODv15_run3 and NanoAODv9_run2 were added, including new L1 trigger definitions and scripts/docs to integrate the latest nanoAOD branches, alongside dependency updates and quality improvements. Fat Jet Analysis Enhancements introduced b-jet energy regression, ParticleNet vs QCD scoring, and N-subjettiness calculations with Run2/Run3 applicability guidance. Jet Energy Corrections and Seeding workflow expanded with a JetPtSmearingSeed producer; PtCorrectionMC signature updated and PtCorrectionBJets refactored for clarity. Several commits focused on code quality and documentation, addressing review feedback and docstring fixes. Overall impact: improved Run3 readiness, higher fidelity jet reconstruction and analyses, and stronger maintainability. Technologies/skills demonstrated: C++, Python scripting, run configuration management, documentation, and dependency maintenance.
August 2025
July 2025
23 Commits • 7 Features
Jul 1, 2025Summary for 2025-07: Focused on enabling compatibility with the latest NanoAOD releases, stabilizing data handling, and improving code quality and maintainability. Delivered substantial feature work and targeted bug fixes that unlocks smoother data processing pipelines and long-term scalability across KIT-CMS/CROWN. Key business value includes broader NanoAOD compatibility, safer data processing, and faster, more maintainable development cycles.
July 2025
23 Commits • 7 Features
Jul 1, 2025Summary for 2025-07: Focused on enabling compatibility with the latest NanoAOD releases, stabilizing data handling, and improving code quality and maintainability. Delivered substantial feature work and targeted bug fixes that unlocks smoother data processing pipelines and long-term scalability across KIT-CMS/CROWN. Key business value includes broader NanoAOD compatibility, safer data processing, and faster, more maintainable development cycles.
June 2025
55 Commits • 18 Features
Jun 1, 2025June 2025 (KIT-CMS/CROWN) monthly summary: Delivered core feature updates, bug fixes, and quality improvements that enhance compatibility, maintainability, and deployment reliability. Key work centered on integrating updated JSON Pog interface, organizing scale factors by object type, expanding test coverage in MT unittest, and strengthening documentation and code quality. These efforts reduce maintenance overhead, enable faster onboarding, and improve accuracy of physics analyses.
55 Commits • 18 Features
Jun 1, 2025June 2025 (KIT-CMS/CROWN) monthly summary: Delivered core feature updates, bug fixes, and quality improvements that enhance compatibility, maintainability, and deployment reliability. Key work centered on integrating updated JSON Pog interface, organizing scale factors by object type, expanding test coverage in MT unittest, and strengthening documentation and code quality. These efforts reduce maintenance overhead, enable faster onboarding, and improve accuracy of physics analyses.
June 2025
May 2025
2 Commits • 2 Features
May 1, 2025May 2025 monthly summary for KIT-CMS/CROWN focused on delivering user-facing improvements and enabling reproducible workflows. Delivered two key features with documentation improvements and CLI configurability; no reported critical bug fixes this period; laying groundwork for smoother onboarding and contributor collaboration.
May 2025
2 Commits • 2 Features
May 1, 2025May 2025 monthly summary for KIT-CMS/CROWN focused on delivering user-facing improvements and enabling reproducible workflows. Delivered two key features with documentation improvements and CLI configurability; no reported critical bug fixes this period; laying groundwork for smoother onboarding and contributor collaboration.
April 2025
11 Commits • 5 Features
Apr 1, 2025April 2025 monthly summary for KIT-CMS/CROWN: Delivered a modernization pass across electron/muon and tau analyses, plus jet namespace refactor, producer configuration improvements, and general code quality enhancements. The work focused on refactoring core analysis paths, standardizing interfaces and naming, and improving readability and maintainability to speed up future development and reduce risk in data processing pipelines.
11 Commits • 5 Features
Apr 1, 2025April 2025 monthly summary for KIT-CMS/CROWN: Delivered a modernization pass across electron/muon and tau analyses, plus jet namespace refactor, producer configuration improvements, and general code quality enhancements. The work focused on refactoring core analysis paths, standardizing interfaces and naming, and improving readability and maintainability to speed up future development and reduce risk in data processing pipelines.
April 2025
March 2025
17 Commits • 6 Features
Mar 1, 2025March 2025: Delivered a set of impactful improvements to KIT-CMS/CROWN, focusing on maintainability, performance, and developer experience. Key outcomes include a comprehensive codebase refactor and namespace cleanup across the CROWN framework, enhancements to physics object handling (electrons, muons, taus) with improved corrections and filtering, relocation of the fake factor production logic to C++ addons for modularity and performance, and targeted logging/error-detection improvements in code generation and correction workflows. Concluded with code style cleanups (clang-format), documentation namespace refactors, and documentation build/config improvements to streamline docs generation. Together these changes reduce technical debt, stabilize the analysis pipeline, and accelerate future feature delivery.
March 2025
17 Commits • 6 Features
Mar 1, 2025March 2025: Delivered a set of impactful improvements to KIT-CMS/CROWN, focusing on maintainability, performance, and developer experience. Key outcomes include a comprehensive codebase refactor and namespace cleanup across the CROWN framework, enhancements to physics object handling (electrons, muons, taus) with improved corrections and filtering, relocation of the fake factor production logic to C++ addons for modularity and performance, and targeted logging/error-detection improvements in code generation and correction workflows. Concluded with code style cleanups (clang-format), documentation namespace refactors, and documentation build/config improvements to streamline docs generation. Together these changes reduce technical debt, stabilize the analysis pipeline, and accelerate future feature delivery.
February 2025
14 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for KIT-CMS/CROWN. Delivered three focused work streams that raise Run-3 readiness, reproducibility, and maintainability: 1) Muon Scale Factor Workflow Enhancements: updated muon scale factors to the latest jsonpog corrections, added a new reconstruction SF evaluation function, removed year-specific parameters to simplify usage, and aligned tests and configuration. 2) Analysis Environment and NanoAOD Versioning Documentation and Configuration Updates: refreshed init.sh for updated OS configurations and LCG usage; updated nanoAOD versioning docs from v9 to v12; expanded analysis configurations and updated sample names and CMake/config references. 3) Code Quality Improvements, Utilities, and Bug Fixes in Analysis Core: applied Black formatting, introduced ROOT::RDF utilities, fixed MET Lorentz-vector assignment, fixed jet propagation to MET, and improved ReplaceProducer outputs handling. Business impact: improved Run-3 consistency, streamlined setup, fewer defects, and clearer documentation, enabling faster iteration and more reliable physics production. Technologies/skills demonstrated include Python, C++/ROOT, ROOT::RDF, nanoAOD workflows, jsonpog corrections, testing, and CI-friendly coding standards.
14 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for KIT-CMS/CROWN. Delivered three focused work streams that raise Run-3 readiness, reproducibility, and maintainability: 1) Muon Scale Factor Workflow Enhancements: updated muon scale factors to the latest jsonpog corrections, added a new reconstruction SF evaluation function, removed year-specific parameters to simplify usage, and aligned tests and configuration. 2) Analysis Environment and NanoAOD Versioning Documentation and Configuration Updates: refreshed init.sh for updated OS configurations and LCG usage; updated nanoAOD versioning docs from v9 to v12; expanded analysis configurations and updated sample names and CMake/config references. 3) Code Quality Improvements, Utilities, and Bug Fixes in Analysis Core: applied Black formatting, introduced ROOT::RDF utilities, fixed MET Lorentz-vector assignment, fixed jet propagation to MET, and improved ReplaceProducer outputs handling. Business impact: improved Run-3 consistency, streamlined setup, fewer defects, and clearer documentation, enabling faster iteration and more reliable physics production. Technologies/skills demonstrated include Python, C++/ROOT, ROOT::RDF, nanoAOD workflows, jsonpog corrections, testing, and CI-friendly coding standards.
February 2025
Activity
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Quality Metrics
Correctness91.2%
Maintainability92.0%
Architecture89.2%
Performance85.0%
AI Usage20.8%
Skills & Technologies
Programming Languages
C++CMakeDockerfileDoxygenGZJSONPythonRSTShellYAML
Technical Skills
Backend DevelopmentBug FixBug FixingBuild SystemBuild SystemsBuild configurationC++C++ DevelopmentC++ developmentC++ programmingCMakeCMake configurationCode CleanupCode CorrectionCode Formatting
Repositories Contributed To
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