PolicyEngine/policyengine-us
Aug 2025 – Mar 2026
8 Months active
Languages Used
BashMakefileMarkdownPythonShellYAMLpythonyaml
Technical Skills
Backend DevelopmentBatch ProcessingBenefit CalculationBuild AutomationCI/CDChildcare Subsidies
Ziming
PROFILE
Ziming
Over eight months, this developer engineered and maintained complex policy modeling and eligibility systems for PolicyEngine/policyengine-us, delivering over 200 features and 100 bug fixes. They implemented multi-state TANF and subsidy programs, modernized benefit calculations, and standardized policy logic using Python, YAML, and GitHub Actions. Their approach emphasized parameter-driven configuration, robust test automation, and CI/CD workflow enhancements to ensure regulatory compliance and maintainability. By refactoring legacy code, expanding test coverage, and integrating new state programs, they improved system scalability and reliability. Their work enabled faster onboarding of new policies, more accurate benefit simulations, and streamlined collaboration across the codebase.
Overall Statistics
Feature vs Bugs
65%Features
Repository Contributions
761Total
Bugs
108
Commits
761
Features
202
Lines of code
350,758
Activity Months8
Your Network
30 peopleSame Organization
@policyengine.org5
Work History
March 2026
91 Commits • 19 Features
Mar 1, 2026PolicyEngine US - March 2026 Monthly Summary Overview: This month delivered substantial improvements across NE coverage, per-MS 2840 policy rules, MFIP benefit modeling, and CCAP implementations, enhancing policy accuracy, state coverage, test robustness, and security. The work emphasizes business value through improved compliance, broader policy applicability, and maintainable infrastructure for scaling subsidies. Key features delivered: - NE ADC test coverage improvements: added boundary test at 2025-01 to verify pre-July switchover, integration tests for multiple brackets (2017, 2021, 2018-01, 2022-01), initial applicant integration test, historical person increment tests, updated Nebraska TANF references, and removal of Urban Institute WRDTP references. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - KY K-TAP and partial months disregard: added partial months disregard to the formula and restructured earned income math to apply per-person, with per-MS 2840 alignment and comprehensive test updates. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - MFIP FWL: use full Transitional Standard (cash + food) for MFIP FWL and benefit formula, aligning with MN statute and clarifying how SNAP portion is treated in intermediate calculations. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - Rhode Island CCAP implementation: initialization and implementation of RI CCAP, plus related test updates and changelog fragment to document the rollout. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - New Hampshire CCAP implementation: implementation of NH CCAP, changelog fragment, and review fixes (Round 1 and Round 2) to address critical references, rates, and integration tests. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> Major bugs fixed: - General fixes and cleanup across references, dates, metadata, and gross income handling, addressing multiple PR findings. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - FDPIR cleanup: partial status update and removal of stale worktrees and incorrect changelog fragments to improve consistency. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - SNAP/SUA data corrections: corrected utility allowance data and related region values, dates, and formatting across multiple states for FY2019 and later periods. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - NH CCAP Review Fixes: Round 1 and Round 2 fixes to address broken reference URLs, rate adjustments, and end-to-end integration test updates. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> Overall impact and accomplishments: - Expanded coverage and accuracy of policy simulations across NE, RI, and NH CCAP programs, delivering more reliable forecasting and compliance for state services. - Improved maintainability and scalability via YAML-based parameterization and federal CCDF scaffolding to reduce duplication across states. - Strengthened security and CI: CI push workflow updated to GitHub App token authentication, reducing exposure of credentials and aligning with modern CI practices. - Data integrity improvements through careful backdating, reference corrections, and alignment with official sources, enabling future microsimulation runs to reflect current and historical policy. Technologies, skills demonstrated: - PolicyEngine modeling and rule-based benefit calculation, including complex per-person and month-based calculations. - Test automation and microsimulation alignment across multiple states. - YAML parameterization and refactoring of subsidies, CCAP programs, and rates for maintainability. - CI/CD improvements and secure deployment practices (GitHub App authentication). - Data governance: backdating, reference integrity, and regulatory metadata management. Business value: - Reduced policy risk with enhanced test coverage and robust edge-case handling. - Expanded state coverage for CCAP programs increases service reach and policy accuracy for clients. - Secure CI/CD processes and maintainable config enable faster, safer releases and ongoing policy updates.
91 Commits • 19 Features
Mar 1, 2026PolicyEngine US - March 2026 Monthly Summary Overview: This month delivered substantial improvements across NE coverage, per-MS 2840 policy rules, MFIP benefit modeling, and CCAP implementations, enhancing policy accuracy, state coverage, test robustness, and security. The work emphasizes business value through improved compliance, broader policy applicability, and maintainable infrastructure for scaling subsidies. Key features delivered: - NE ADC test coverage improvements: added boundary test at 2025-01 to verify pre-July switchover, integration tests for multiple brackets (2017, 2021, 2018-01, 2022-01), initial applicant integration test, historical person increment tests, updated Nebraska TANF references, and removal of Urban Institute WRDTP references. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - KY K-TAP and partial months disregard: added partial months disregard to the formula and restructured earned income math to apply per-person, with per-MS 2840 alignment and comprehensive test updates. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - MFIP FWL: use full Transitional Standard (cash + food) for MFIP FWL and benefit formula, aligning with MN statute and clarifying how SNAP portion is treated in intermediate calculations. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - Rhode Island CCAP implementation: initialization and implementation of RI CCAP, plus related test updates and changelog fragment to document the rollout. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - New Hampshire CCAP implementation: implementation of NH CCAP, changelog fragment, and review fixes (Round 1 and Round 2) to address critical references, rates, and integration tests. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> Major bugs fixed: - General fixes and cleanup across references, dates, metadata, and gross income handling, addressing multiple PR findings. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - FDPIR cleanup: partial status update and removal of stale worktrees and incorrect changelog fragments to improve consistency. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - SNAP/SUA data corrections: corrected utility allowance data and related region values, dates, and formatting across multiple states for FY2019 and later periods. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> - NH CCAP Review Fixes: Round 1 and Round 2 fixes to address broken reference URLs, rate adjustments, and end-to-end integration test updates. Co-authored-By: Claude Opus 4.6 <noreply@anthropic.com> Overall impact and accomplishments: - Expanded coverage and accuracy of policy simulations across NE, RI, and NH CCAP programs, delivering more reliable forecasting and compliance for state services. - Improved maintainability and scalability via YAML-based parameterization and federal CCDF scaffolding to reduce duplication across states. - Strengthened security and CI: CI push workflow updated to GitHub App token authentication, reducing exposure of credentials and aligning with modern CI practices. - Data integrity improvements through careful backdating, reference corrections, and alignment with official sources, enabling future microsimulation runs to reflect current and historical policy. Technologies, skills demonstrated: - PolicyEngine modeling and rule-based benefit calculation, including complex per-person and month-based calculations. - Test automation and microsimulation alignment across multiple states. - YAML parameterization and refactoring of subsidies, CCAP programs, and rates for maintainability. - CI/CD improvements and secure deployment practices (GitHub App authentication). - Data governance: backdating, reference integrity, and regulatory metadata management. Business value: - Reduced policy risk with enhanced test coverage and robust edge-case handling. - Expanded state coverage for CCAP programs increases service reach and policy accuracy for clients. - Secure CI/CD processes and maintainable config enable faster, safer releases and ongoing policy updates.
March 2026
February 2026
7 Commits • 2 Features
Feb 1, 2026February 2026: Monthly summary for PolicyEngine/policyengine-us highlighting key feature deliveries, major bug fixes, and business impact. Focus on multi-state eligibility updates, refactor work, and documentation improvements. Highlights include updated eligibility calculations, parameter normalization, expanded tests, YAML/reference improvements, and enhanced maintainability.
February 2026
7 Commits • 2 Features
Feb 1, 2026February 2026: Monthly summary for PolicyEngine/policyengine-us highlighting key feature deliveries, major bug fixes, and business impact. Focus on multi-state eligibility updates, refactor work, and documentation improvements. Highlights include updated eligibility calculations, parameter normalization, expanded tests, YAML/reference improvements, and enhanced maintainability.
January 2026
210 Commits • 62 Features
Jan 1, 2026January 2026 (PolicyEngine US): Delivered multi-state TANF enhancements with emphasis on Alaska ATA and Vermont Reach Up, expanded coverage to Wyoming POWER, and progressed North Dakota TANF finalization. Also advanced Florida TCA, Louisiana FITAP, and additional state workstreams. Improved testing, CI/CD, and documentation to increase integration reliability and maintainability. Key features delivered: - Alaska TANF (ATA) / ATAP implementation: full TANF logic (income eligibility tests, deductions, need standards, benefit calculation, resource eligibility) with YAML-based tests; co-authored contributions; robust unit/integration coverage. - Vermont TANF (Reach Up) program: income eligibility, earned income disregards, housing allowance by county, and ratable benefit reduction; strong test suite. - Wyoming TANF (POWER) program: income eligibility with flat disregards, benefit standards by household size, resource limit, and integration with federal TANF baseline. - North Dakota TANF: finalization per review feedback; code cleanup (naming alignment, removal of unused params), updated resources, and 87 tests passing. - Broadened scope: Florida TANF (TCA), Louisiana FITAP, South Carolina TANF, and Illinois IHWAP enhancements; documented policy references and expanded test coverage. Major bugs fixed: - Test suite stabilization and broader test coverage; fixes for failing tests; CI workflow improvements (uv.lock, labels, main branch updates); date handling corrections and backdating adjustments across states; removal of lifetime time limit parameter due to architecture. - PR/CI workflow fixes and miscellaneous cleanup; test scaffolding and reliability improvements. Overall impact and accomplishments: - Significantly expanded and stabilized TANF parameterization across multiple states, enabling faster onboarding of state programs and more accurate benefit calculations. Strengthened release readiness with CI/CD enhancements and comprehensive test coverage, reducing risk in production deployments. Technologies/skills demonstrated: - YAML-driven tests and policy parameter modeling; policy engine refactor and naming consistency; extensive unit/integration test design; CI/CD workflow optimization; documentation drafting and policy references; cross-state compliance and validation.
210 Commits • 62 Features
Jan 1, 2026January 2026 (PolicyEngine US): Delivered multi-state TANF enhancements with emphasis on Alaska ATA and Vermont Reach Up, expanded coverage to Wyoming POWER, and progressed North Dakota TANF finalization. Also advanced Florida TCA, Louisiana FITAP, and additional state workstreams. Improved testing, CI/CD, and documentation to increase integration reliability and maintainability. Key features delivered: - Alaska TANF (ATA) / ATAP implementation: full TANF logic (income eligibility tests, deductions, need standards, benefit calculation, resource eligibility) with YAML-based tests; co-authored contributions; robust unit/integration coverage. - Vermont TANF (Reach Up) program: income eligibility, earned income disregards, housing allowance by county, and ratable benefit reduction; strong test suite. - Wyoming TANF (POWER) program: income eligibility with flat disregards, benefit standards by household size, resource limit, and integration with federal TANF baseline. - North Dakota TANF: finalization per review feedback; code cleanup (naming alignment, removal of unused params), updated resources, and 87 tests passing. - Broadened scope: Florida TANF (TCA), Louisiana FITAP, South Carolina TANF, and Illinois IHWAP enhancements; documented policy references and expanded test coverage. Major bugs fixed: - Test suite stabilization and broader test coverage; fixes for failing tests; CI workflow improvements (uv.lock, labels, main branch updates); date handling corrections and backdating adjustments across states; removal of lifetime time limit parameter due to architecture. - PR/CI workflow fixes and miscellaneous cleanup; test scaffolding and reliability improvements. Overall impact and accomplishments: - Significantly expanded and stabilized TANF parameterization across multiple states, enabling faster onboarding of state programs and more accurate benefit calculations. Strengthened release readiness with CI/CD enhancements and comprehensive test coverage, reducing risk in production deployments. Technologies/skills demonstrated: - YAML-driven tests and policy parameter modeling; policy engine refactor and naming consistency; extensive unit/integration test design; CI/CD workflow optimization; documentation drafting and policy references; cross-state compliance and validation.
January 2026
December 2025
230 Commits • 59 Features
Dec 1, 2025December 2025 (2025-12) monthly summary for PolicyEngine/policyengine-us focusing on cross-state TANF implementations, code quality, testing, and CI enhancements. The team delivered multi-state TANF scaffolding and finalization, improved test coverage, and strengthened CI processes, driving regulatory compliance and faster policy iteration.
December 2025
230 Commits • 59 Features
Dec 1, 2025December 2025 (2025-12) monthly summary for PolicyEngine/policyengine-us focusing on cross-state TANF implementations, code quality, testing, and CI enhancements. The team delivered multi-state TANF scaffolding and finalization, improved test coverage, and strengthened CI processes, driving regulatory compliance and faster policy iteration.
November 2025
122 Commits • 37 Features
Nov 1, 2025November 2025 monthly summary for PolicyEngine-US focusing on cross-state TANF implementations, parameterization, and test quality. Highlights include PA, OH, GA, WA, TN, MI (FIP rename), WI, MO, IN, MN developments, with standardized patterns, zero-hard-coded values, and expanded test coverage driving policy compliance and maintainability.
122 Commits • 37 Features
Nov 1, 2025November 2025 monthly summary for PolicyEngine-US focusing on cross-state TANF implementations, parameterization, and test quality. Highlights include PA, OH, GA, WA, TN, MI (FIP rename), WI, MO, IN, MN developments, with standardized patterns, zero-hard-coded values, and expanded test coverage driving policy compliance and maintainability.
November 2025
October 2025
15 Commits • 3 Features
Oct 1, 2025Month 2025-10 highlights substantial policy modernization and program updates in PolicyEngine/policyengine-us. Delivered major feature work across TANF policy calculation modernization with immigration integration, CCS regional payment enhancements, and Harris County RIDES 2025 updates, complemented by codebase cleanup. The work emphasizes standardization, parameter-driven logic, and alignment with 2025 policy parameters, delivering safer, more maintainable and scalable policy calculations with improved test coverage and documentation.
October 2025
15 Commits • 3 Features
Oct 1, 2025Month 2025-10 highlights substantial policy modernization and program updates in PolicyEngine/policyengine-us. Delivered major feature work across TANF policy calculation modernization with immigration integration, CCS regional payment enhancements, and Harris County RIDES 2025 updates, complemented by codebase cleanup. The work emphasizes standardization, parameter-driven logic, and alignment with 2025 policy parameters, delivering safer, more maintainable and scalable policy calculations with improved test coverage and documentation.
September 2025
30 Commits • 7 Features
Sep 1, 2025September 2025 monthly work summary for PolicyEngine/policyengine-us focusing on delivering business value through key features, reliability improvements, and maintainable code. Highlights include refined payment processing, enhanced eligibility calculations, and critical asset recovery, alongside targeted refactors and reliability fixes that reduce risk and improve future velocity.
30 Commits • 7 Features
Sep 1, 2025September 2025 monthly work summary for PolicyEngine/policyengine-us focusing on delivering business value through key features, reliability improvements, and maintainable code. Highlights include refined payment processing, enhanced eligibility calculations, and critical asset recovery, alongside targeted refactors and reliability fixes that reduce risk and improve future velocity.
September 2025
August 2025
56 Commits • 13 Features
Aug 1, 2025August 2025 — PolicyEngine/policyengine-us: A focused month centered on stability, improved testing reliability, and business-impacting feature delivery. Investments in memory-optimized test infrastructure, enhanced baseline/workflow orchestration, and CI visibility enabled faster feedback and stronger production reliability. Notable feature work includes tests for age category and TAFDC eligibility and the California Riverside County General Relief Program, alongside critical LIHEAP bug fixes and code quality improvements.
August 2025
56 Commits • 13 Features
Aug 1, 2025August 2025 — PolicyEngine/policyengine-us: A focused month centered on stability, improved testing reliability, and business-impacting feature delivery. Investments in memory-optimized test infrastructure, enhanced baseline/workflow orchestration, and CI visibility enabled faster feedback and stronger production reliability. Notable feature work includes tests for age category and TAFDC eligibility and the California Riverside County General Relief Program, alongside critical LIHEAP bug fixes and code quality improvements.
Activity
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Quality Metrics
Correctness91.4%
Maintainability85.2%
Architecture86.4%
Performance84.4%
AI Usage39.6%
Skills & Technologies
Programming Languages
BashJavaScriptMakefileMarkdownN/ANonePythonShellUnknownYAML
Technical Skills
AI Agent DevelopmentAI IntegrationAI integrationAI-assisted developmentAPI developmentAPI integrationAutomationBackend DevelopmentBatch ProcessingBenefit CalculationBuild AutomationCI/CDChildcare SubsidiesCode CleanupCode Formatting
Repositories Contributed To
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