openfisca/openfisca-france
Dec 2024 – Mar 2026
9 Months active
Languages Used
YAMLMarkdownPythonTOML
Technical Skills
Parameter ConfigurationTestingYAMLBackend DevelopmentChangelog ManagementCode Formatting
Duchesne Sylvain
PROFILE
Duchesne Sylvain
Sylvain Duchesne contributed to the openfisca/openfisca-france repository by developing and maintaining core backend features for tax and social benefits calculation. Over nine months, he delivered updates to policy logic, recalibrated tax credits, and modernized eligibility rules, ensuring regulatory compliance and calculation accuracy. His work involved Python and YAML for parameter configuration, code refactoring, and rigorous testing to validate new scenarios and prevent regressions. Sylvain also improved documentation and changelog management, enhancing traceability and maintainability. By addressing both feature development and bug fixes, he strengthened the reliability of socio-fiscal models and supported ongoing adaptation to legislative changes.
Overall Statistics
Feature vs Bugs
74%Features
Repository Contributions
36Total
Bugs
5
Commits
36
Features
14
Lines of code
801
Activity Months9
Your Network
28 peopleShared Repositories
28
benoit-ctyMember
=Member
benoit-ctyMember
Kout95Member
b-michaudMember
benoit-ctyMember
benoit-ctyMember
c82mbilMember
cglMember
Work History
March 2026
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for openfisca-france focusing on policy configuration updates and documentation quality. Delivered a key Family benefits policy update to reflect the new decree age thresholds by adjusting YAML configuration, performing a version bump, and updating the changelog to document socio-fiscal changes. Fixed a documentation grammar issue in the YAML for age criteria to enhance clarity and reduce misinterpretation. These changes improve policy accuracy and release readiness while maintaining clear traceability and auditability.
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for openfisca-france focusing on policy configuration updates and documentation quality. Delivered a key Family benefits policy update to reflect the new decree age thresholds by adjusting YAML configuration, performing a version bump, and updating the changelog to document socio-fiscal changes. Fixed a documentation grammar issue in the YAML for age criteria to enhance clarity and reduce misinterpretation. These changes improve policy accuracy and release readiness while maintaining clear traceability and auditability.
March 2026
February 2026
4 Commits • 1 Features
Feb 1, 2026February 2026 — Focused on accuracy, regulatory alignment, and maintainability for France tax rules in openfisca/openfisca-france. Delivered crucial fixes and a major framework update for 2026, with test updates to reflect new data and rules. Business value: more reliable tax computations, compliance with finance-law changes, and reduced regression risk. Technical accomplishments: bug fixes, framework updates, YAML parameter management, and test suite enhancements, all tracked via commits below and prepared for 2026 readiness.
February 2026
4 Commits • 1 Features
Feb 1, 2026February 2026 — Focused on accuracy, regulatory alignment, and maintainability for France tax rules in openfisca/openfisca-france. Delivered crucial fixes and a major framework update for 2026, with test updates to reflect new data and rules. Business value: more reliable tax computations, compliance with finance-law changes, and reduced regression risk. Technical accomplishments: bug fixes, framework updates, YAML parameter management, and test suite enhancements, all tracked via commits below and prepared for 2026 readiness.
January 2026
3 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for openfisca-france focusing on regulatory-aligned tax parameter updates and a critical calculation fix that strengthened compliance, accuracy, and business value for the France tax module.
3 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for openfisca-france focusing on regulatory-aligned tax parameter updates and a critical calculation fix that strengthened compliance, accuracy, and business value for the France tax module.
January 2026
December 2025
5 Commits • 2 Features
Dec 1, 2025Monthly summary for 2025-12 for repository openfisca/openfisca-france. Delivered regulatory updates for 2026, updated calculation logic for capital income CSG, aligned family benefits eligibility thresholds, expanded test coverage, and improved configuration/labeling for maintainability. These changes enhance calculation accuracy, regulatory compliance, and readiness for 2026 scenarios in a production-like environment.
December 2025
5 Commits • 2 Features
Dec 1, 2025Monthly summary for 2025-12 for repository openfisca/openfisca-france. Delivered regulatory updates for 2026, updated calculation logic for capital income CSG, aligned family benefits eligibility thresholds, expanded test coverage, and improved configuration/labeling for maintainability. These changes enhance calculation accuracy, regulatory compliance, and readiness for 2026 scenarios in a production-like environment.
September 2025
4 Commits • 1 Features
Sep 1, 2025Monthly summary for 2025-09 focused on delivering business value and technical excellence for openfisca/openfisca-france. Key features delivered include Forest Investment Tax Credit Calculation Corrections and Enhancements for 2022-2024, which corrects calculations, removes spending-cap implications for management contracts, ensures year-to-year rollover, and adds new tax-code input fields; and Code Quality Improvements and Cleanup in Tax Reduction Modules, addressing lint issues and removing obsolete code paths. Major bugs fixed center on maintainability improvements and code hygiene (linting and legacy paths such as location_meublee f7st). Overall impact: higher accuracy of tax-credit computations, reduced risk from legacy code, greater maintainability, and better readiness for future tax-code updates. Technologies/skills demonstrated include Python-based tax modeling, rigorous linting, refactoring, and schema enhancements to support multi-year tax calculations.
4 Commits • 1 Features
Sep 1, 2025Monthly summary for 2025-09 focused on delivering business value and technical excellence for openfisca/openfisca-france. Key features delivered include Forest Investment Tax Credit Calculation Corrections and Enhancements for 2022-2024, which corrects calculations, removes spending-cap implications for management contracts, ensures year-to-year rollover, and adds new tax-code input fields; and Code Quality Improvements and Cleanup in Tax Reduction Modules, addressing lint issues and removing obsolete code paths. Major bugs fixed center on maintainability improvements and code hygiene (linting and legacy paths such as location_meublee f7st). Overall impact: higher accuracy of tax-credit computations, reduced risk from legacy code, greater maintainability, and better readiness for future tax-code updates. Technologies/skills demonstrated include Python-based tax modeling, rigorous linting, refactoring, and schema enhancements to support multi-year tax calculations.
September 2025
March 2025
1 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03: Key feature delivered was the Pass Colo Eligibility Rule Update in openfisca/openfisca-france. Eligibility now uses age as of January 1 instead of birth year. Included changelog update and version bump to 169.18.5. No major bugs fixed this month. The change improves accuracy for annual eligibility processing, enhances policy compliance, and reduces misclassification risks. Demonstrated skills in policy-driven feature development, code versioning, changelog maintenance, and cross-team documentation.
March 2025
1 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03: Key feature delivered was the Pass Colo Eligibility Rule Update in openfisca/openfisca-france. Eligibility now uses age as of January 1 instead of birth year. Included changelog update and version bump to 169.18.5. No major bugs fixed this month. The change improves accuracy for annual eligibility processing, enhances policy compliance, and reduces misclassification risks. Demonstrated skills in policy-driven feature development, code versioning, changelog maintenance, and cross-team documentation.
February 2025
7 Commits • 3 Features
Feb 1, 2025February 2025 — OpenFisca France delivered key feature updates, stability fixes, and release hygiene to improve regulatory alignment and developer maintainability. Focus areas included recalibrating CDHR tax credits, modernizing Pass Colo eligibility, and updating release notes with a version bump to reflect new parameters and thresholds.
7 Commits • 3 Features
Feb 1, 2025February 2025 — OpenFisca France delivered key feature updates, stability fixes, and release hygiene to improve regulatory alignment and developer maintainability. Focus areas included recalibrating CDHR tax credits, modernizing Pass Colo eligibility, and updating release notes with a version bump to reflect new parameters and thresholds.
February 2025
January 2025
7 Commits • 3 Features
Jan 1, 2025Month: 2025-01 — Key features delivered, major fixes, and notable impact for openfisca/openfisca-france with a focus on business value and technical quality. Key features delivered: - PPA nationality eligibility enhancements: added nationality condition to PPA eligibility; extended tests; aligned model behavior with nationality criterion. Commits: 624665f9af639b922bd928eca5e76784241ca8e8; da5ad56a5a6131ee5bc0abf1278c5c2044d5f0f5; 42bdb89bba55000fa9fd27e2d5c3ebc9d1818a60. - OpenFisca-France model update: bumped model to 169.13.1 with minor socio-fiscal evolution; update changelog. Commit: 06ff502ea5573f57476254e69c80d9432c76f3cf. Major bugs fixed / maintenance: - PPA module maintenance and test cleanup: remove duplicate test; lint and formatting improvements to increase reliability. Commits: ad68721e705c63d308b580fd4a4bda47881fb66d; 2a09a88fc4805c0561be17ac26fbad20fc15b540; 2ee6e5b802450ddc0f227df9028806218136e616. Overall impact and accomplishments: - Improved eligibility accuracy and testing coverage; ensured regulatory alignment for nationality-based eligibility; kept the OpenFisca-France model current with legislative evolution; reduced risk through test cleanup and code quality improvements; strengthened repository reliability for upcoming releases. Technologies/skills demonstrated: - Python, pytest-based testing, linting, code formatting, changelog maintenance, semantic versioning, and release housekeeping.
January 2025
7 Commits • 3 Features
Jan 1, 2025Month: 2025-01 — Key features delivered, major fixes, and notable impact for openfisca/openfisca-france with a focus on business value and technical quality. Key features delivered: - PPA nationality eligibility enhancements: added nationality condition to PPA eligibility; extended tests; aligned model behavior with nationality criterion. Commits: 624665f9af639b922bd928eca5e76784241ca8e8; da5ad56a5a6131ee5bc0abf1278c5c2044d5f0f5; 42bdb89bba55000fa9fd27e2d5c3ebc9d1818a60. - OpenFisca-France model update: bumped model to 169.13.1 with minor socio-fiscal evolution; update changelog. Commit: 06ff502ea5573f57476254e69c80d9432c76f3cf. Major bugs fixed / maintenance: - PPA module maintenance and test cleanup: remove duplicate test; lint and formatting improvements to increase reliability. Commits: ad68721e705c63d308b580fd4a4bda47881fb66d; 2a09a88fc4805c0561be17ac26fbad20fc15b540; 2ee6e5b802450ddc0f227df9028806218136e616. Overall impact and accomplishments: - Improved eligibility accuracy and testing coverage; ensured regulatory alignment for nationality-based eligibility; kept the OpenFisca-France model current with legislative evolution; reduced risk through test cleanup and code quality improvements; strengthened repository reliability for upcoming releases. Technologies/skills demonstrated: - Python, pytest-based testing, linting, code formatting, changelog maintenance, semantic versioning, and release housekeeping.
December 2024
2 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for openfisca/openfisca-france: Delivered a targeted correction to social benefits parameter dates and expanded test coverage for 2018 PPA scenarios. The work stabilizes retroactive benefit calculations, enhances regulatory alignment, and reduces risk of miscalculations in benefit determinations.
2 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for openfisca/openfisca-france: Delivered a targeted correction to social benefits parameter dates and expanded test coverage for 2018 PPA scenarios. The work stabilizes retroactive benefit calculations, enhances regulatory alignment, and reduces risk of miscalculations in benefit determinations.
December 2024
Activity
Loading activity data...
Quality Metrics
Correctness93.6%
Maintainability92.8%
Architecture90.6%
Performance88.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
MarkdownPythonTOMLYAML
Technical Skills
Backend DevelopmentChangelog ManagementCode FormattingCode LintingCode RefactoringConfiguration ManagementDocumentationFinancial ModelingParameter ConfigurationPolicy CalculationPythonPython DevelopmentRelease ManagementRule-based SystemsSocial Benefits Calculation
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline