google/meridian
Oct 2024 – Feb 2026
13 Months active
Languages Used
PythonSQLBashGit IgnoreMarkdownYAMLArviZJavaScript
Technical Skills
Backend DevelopmentData ValidationTestingCode ClarityCode MaintenanceCode Organization
Santoso Wijaya
PROFILE
Santoso Wijaya
Swijaya developed and maintained core features for the google/meridian repository, focusing on backend architecture, data validation, and workflow automation. Over 13 months, Swijaya delivered modular model math, robust data loaders, and streamlined CI/CD pipelines using Python, SQL, and TensorFlow. Their work included refactoring sampling logic for testability, implementing cross-version compatibility, and enhancing API clarity for budget optimization and analytics. By introducing type hints, configuration management, and automated release workflows, Swijaya improved maintainability and reduced technical debt. The engineering approach emphasized clear documentation, rigorous testing, and scalable design, resulting in a reliable, extensible platform for analytics-driven decision-making.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
85Total
Bugs
14
Commits
85
Features
35
Lines of code
29,756
Activity Months13
Your Network
4408 peopleSame Organization
@google.com4393
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Shared Repositories
15
Avishai HalevMember
Amer ElsheikhMember
Andy TanMember
Edgar ZhuMember
Jeff LiMember
Ken LuoMember
Lolita NazarovMember
Lukasz MazurekMember
The tunix AuthorsMember
Work History
February 2026
4 Commits • 1 Features
Feb 1, 2026February 2026: Delivered stability and architectural improvements for Meridian focusing on data processing correctness and future-proofing. Addressed a NumPy API usage bug and completed a major codebase restructuring with a namespace migration, culminating in a version bump to 1.5.2. The work reduces runtime errors, improves maintainability, and lays a solid foundation for upcoming features and downstream integrations.
4 Commits • 1 Features
Feb 1, 2026February 2026: Delivered stability and architectural improvements for Meridian focusing on data processing correctness and future-proofing. Addressed a NumPy API usage bug and completed a major codebase restructuring with a namespace migration, culminating in a version bump to 1.5.2. The work reduces runtime errors, improves maintainability, and lays a solid foundation for upcoming features and downstream integrations.
February 2026
January 2026
1 Commits
Jan 1, 2026January 2026 - google/meridian: Implemented Analyzer parameter validation and deprecation cleanup to improve robustness, correctness, and maintainability. Added required-parameter checks in Analyzer and refined model context handling; removed outdated methods and deprecated APIs to reduce surface area and ease migrations. Commit: 924e89d2306f41776e2fba0dec3254e78c6e1b2b. PiperOrigin-RevId: 855512859.
January 2026
1 Commits
Jan 1, 2026January 2026 - google/meridian: Implemented Analyzer parameter validation and deprecation cleanup to improve robustness, correctness, and maintainability. Added required-parameter checks in Analyzer and refined model context handling; removed outdated methods and deprecated APIs to reduce surface area and ease migrations. Commit: 924e89d2306f41776e2fba0dec3254e78c6e1b2b. PiperOrigin-RevId: 855512859.
December 2025
10 Commits • 1 Features
Dec 1, 20252025-12: Implemented Meridian architecture refactor to modularize model math and decouple sampling, established deprecation handling, and aligned dependencies for future extensibility. The work improves maintainability, testability, and upgrade safety, enabling faster iteration and clearer API guidance for downstream teams. Lays groundwork for stateless model math via ModelEquations and ModelContext with modular equation modules and deprecation-aware APIs.
10 Commits • 1 Features
Dec 1, 20252025-12: Implemented Meridian architecture refactor to modularize model math and decouple sampling, established deprecation handling, and aligned dependencies for future extensibility. The work improves maintainability, testability, and upgrade safety, enabling faster iteration and clearer API guidance for downstream teams. Lays groundwork for stateless model math via ModelEquations and ModelContext with modular equation modules and deprecation-aware APIs.
December 2025
November 2025
13 Commits • 4 Features
Nov 1, 2025November 2025 — google/meridian: Delivered focused platform improvements across CI/CD, dependencies, analytics protos, and documentation to accelerate reliable releases and broaden capability surface for analytics-driven decision-making.
November 2025
13 Commits • 4 Features
Nov 1, 2025November 2025 — google/meridian: Delivered focused platform improvements across CI/CD, dependencies, analytics protos, and documentation to accelerate reliable releases and broaden capability surface for analytics-driven decision-making.
July 2025
4 Commits • 2 Features
Jul 1, 2025July 2025 performance summary for google/meridian focusing on key business outcomes and technical achievements. Delivered a sigma handling refactor to simplify and standardize cross-geography inferences, improved data input UX with builder-wide default column names, and ensured release documentation accuracy for user-facing notes. These efforts reduce complexity, accelerate data integration, and improve reliability of model deployments and user communications.
4 Commits • 2 Features
Jul 1, 2025July 2025 performance summary for google/meridian focusing on key business outcomes and technical achievements. Delivered a sigma handling refactor to simplify and standardize cross-geography inferences, improved data input UX with builder-wide default column names, and ensured release documentation accuracy for user-facing notes. These efforts reduce complexity, accelerate data integration, and improve reliability of model deployments and user communications.
July 2025
June 2025
8 Commits • 3 Features
Jun 1, 2025June 2025: Three features delivered (Docs improvements for Meridian Getting Started, Colab Excel (.xlsx) support, and Public API exposure for Input Builders), plus a major data loader robustness fix and API compatibility improvements. Resulted in improved onboarding, broader Colab usage, and cleaner, more reliable data processing. Version 1.1.4 released, strengthening maintainability and compatibility.
June 2025
8 Commits • 3 Features
Jun 1, 2025June 2025: Three features delivered (Docs improvements for Meridian Getting Started, Colab Excel (.xlsx) support, and Public API exposure for Input Builders), plus a major data loader robustness fix and API compatibility improvements. Resulted in improved onboarding, broader Colab usage, and cleaner, more reliable data processing. Version 1.1.4 released, strengthening maintainability and compatibility.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary for google/meridian: Delivered flexibility and robustness in the Meridian model by enabling optional control variables and strengthening data input validation. These changes improve user experience for analyses without control data, reduce the risk of biased priors, and enhance maintainability through clearer data validation practices. Overall, the work supports broader adoption and more reliable modeling outcomes.
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary for google/meridian: Delivered flexibility and robustness in the Meridian model by enabling optional control variables and strengthening data input validation. These changes improve user experience for analyses without control data, reduce the risk of biased priors, and enhance maintainability through clearer data validation practices. Overall, the work supports broader adoption and more reliable modeling outcomes.
May 2025
March 2025
4 Commits • 3 Features
Mar 1, 2025March 2025 in google/meridian focused on API clarity, CI efficiency, and stable release surface. Key features delivered include API clarifications for Budget Optimization parameters and a collection of release/readme/doc improvements, as well as CI enhancements to speed up test feedback. No critical bugs were reported in this repo scope this month; efforts were concentrated on correctness, documentation, and performance of the development workflow. The combined effect improves budget optimization reliability, accelerates development cycles, and strengthens the public API surface for smoother onboarding and integration.
March 2025
4 Commits • 3 Features
Mar 1, 2025March 2025 in google/meridian focused on API clarity, CI efficiency, and stable release surface. Key features delivered include API clarifications for Budget Optimization parameters and a collection of release/readme/doc improvements, as well as CI enhancements to speed up test feedback. No critical bugs were reported in this repo scope this month; efforts were concentrated on correctness, documentation, and performance of the development workflow. The combined effect improves budget optimization reliability, accelerates development cycles, and strengthens the public API surface for smoother onboarding and integration.
February 2025
23 Commits • 15 Features
Feb 1, 2025February 2025 Meridian: Delivered cross-version Python compatibility, enhanced CI/CD automation, and codebase modernization to improve reliability, release velocity, and maintainability. This month focused on expanding runtime support, tightening release workflows, and modernizing core sampling code for better testability and future enhancements. Business value is realized through faster, safer releases and stronger cross-version support for a growing Python user base.
23 Commits • 15 Features
Feb 1, 2025February 2025 Meridian: Delivered cross-version Python compatibility, enhanced CI/CD automation, and codebase modernization to improve reliability, release velocity, and maintainability. This month focused on expanding runtime support, tightening release workflows, and modernizing core sampling code for better testability and future enhancements. Business value is realized through faster, safer releases and stronger cross-version support for a growing Python user base.
February 2025
January 2025
9 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary: Delivered centralized versioning and release automation, improved GPU memory error guidance, and streamlined onboarding demo, complemented by maintenance hygiene updates. These changes improved release reliability, onboarding speed, and developer experience across the google/meridian repo.
January 2025
9 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary: Delivered centralized versioning and release automation, improved GPU memory error guidance, and streamlined onboarding demo, complemented by maintenance hygiene updates. These changes improved release reliability, onboarding speed, and developer experience across the google/meridian repo.
December 2024
1 Commits
Dec 1, 2024December 2024: No new features released for google/meridian. Major bug fix for Time Coordinate Parameter Semantics: clarified that start_date and end_date parameters are inclusive when provided and must exist within the input data's time coordinates. Updated pydoc to reflect this behavior, aligning documentation with actual semantics. This reduces user confusion and improves API reliability for time-based queries. Commit referenced: 80d98ddb62caa29b06f9fa4d253153a1ac25a9fd.
1 Commits
Dec 1, 2024December 2024: No new features released for google/meridian. Major bug fix for Time Coordinate Parameter Semantics: clarified that start_date and end_date parameters are inclusive when provided and must exist within the input data's time coordinates. Updated pydoc to reflect this behavior, aligning documentation with actual semantics. This reduces user confusion and improves API reliability for time-based queries. Commit referenced: 80d98ddb62caa29b06f9fa4d253153a1ac25a9fd.
December 2024
November 2024
5 Commits • 2 Features
Nov 1, 2024November 2024 focused on increasing KPI visibility in budget optimization, improving maintainability of prior parameter definitions, and ensuring release readiness. Delivered KPI metrics outputs (ROI, mROI, CPIK) across all optimization scenarios with robust handling when revenue data is missing, and introduced is_revenue_kpi to classify KPI types. Consolidated prior distribution parameters into ALL_PRIOR_PARAMETERS for clarity and easier maintenance. Completed codebase housekeeping and released v0.10.0, standardizing TODOs and removing tracker IDs to improve release hygiene and future development velocity. These changes strengthen business decision support, reduce technical debt, and enable smoother feature delivery going into 2025.
November 2024
5 Commits • 2 Features
Nov 1, 2024November 2024 focused on increasing KPI visibility in budget optimization, improving maintainability of prior parameter definitions, and ensuring release readiness. Delivered KPI metrics outputs (ROI, mROI, CPIK) across all optimization scenarios with robust handling when revenue data is missing, and introduced is_revenue_kpi to classify KPI types. Consolidated prior distribution parameters into ALL_PRIOR_PARAMETERS for clarity and easier maintenance. Completed codebase housekeeping and released v0.10.0, standardizing TODOs and removing tracker IDs to improve release hygiene and future development velocity. These changes strengthen business decision support, reduce technical debt, and enable smoother feature delivery going into 2025.
October 2024
1 Commits
Oct 1, 2024October 2024: Implemented cross-channel name uniqueness validation between Media and R&F channels in google/meridian, adding centralized validation (_validate_media_channels) to the InputData class and fixing a duplication bug that raised ValueError. These changes improve data integrity and reduce downstream errors in channel management.
1 Commits
Oct 1, 2024October 2024: Implemented cross-channel name uniqueness validation between Media and R&F channels in google/meridian, adding centralized validation (_validate_media_channels) to the InputData class and fixing a duplication bug that raised ValueError. These changes improve data integrity and reduce downstream errors in channel management.
October 2024
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Quality Metrics
Correctness94.4%
Maintainability93.2%
Architecture92.2%
Performance89.0%
AI Usage21.6%
Skills & Technologies
Programming Languages
ArviZBashGit IgnoreHTMLJavaScriptJupyter NotebookMarkdownPythonSQLTOML
Technical Skills
API DesignBackend DevelopmentCI/CDCode ClarityCode MaintenanceCode OrganizationCode RefactoringColab NotebooksConfiguration ManagementConstant DefinitionConstants ManagementData AnalysisData EngineeringData LoadingData Modeling
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