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Ziming

PROFILE

Ziming

Ziming Hua developed and enhanced policy modeling features for PolicyEngine/policyengine-us, focusing on state and county government benefit programs. Over six months, Ziming delivered new eligibility logic, benefit calculations, and policy reforms for programs such as SNAP, TANF, Medicaid, and local assistance, integrating complex requirements like work rules, exemptions, and regional parameters. He applied Python and YAML to refactor codebases, standardize configuration, and expand automated test coverage, improving maintainability and accuracy. Ziming’s work included backend development, data modeling, and rule engine enhancements, resulting in more reliable policy simulations and streamlined future updates for government program analysis and compliance.

Overall Statistics

Feature vs Bugs

81%Features

Repository Contributions

130Total
Bugs
9
Commits
130
Features
39
Lines of code
18,108
Activity Months6

Work History

August 2025

13 Commits • 2 Features

Aug 1, 2025

August 2025: Delivered end-to-end program integrations for Alameda County GA and Massachusetts CCFA within PolicyEngine/policyengine-us, extending eligibility, benefit calculations, and provider support. Implemented thorough test suites and performed substantial refactors to naming, parameter usage, and the base CCFA class to improve maintainability and future extensibility. The work enhances state program coverage, accuracy of benefits, and risk mitigation through automated testing.

July 2025

20 Commits • 6 Features

Jul 1, 2025

July 2025 monthly summary for PolicyEngine/policyengine-us focusing on delivering policy accuracy, test coverage, and data-driven configuration across core programs. Key outcomes include consolidated Medicaid work requirement reforms with reconciled logic and expanded test coverage; refinements to SNAP ABAWD exemptions; Riverside County LIHEAP eligibility feature with new tests and changelog; DC TANF and POWER policy and integration updates with new age thresholds and refactors; and SNAP earned income exclusion enhancements. A notable bug fix addressed TANF youngest child age determination.

June 2025

18 Commits • 3 Features

Jun 1, 2025

June 2025: Delivered key policy modeling enhancements for the PolicyEngine/policyengine-us, focusing on District of Columbia (DC) programs and SNAP policy updates. Key features delivered include DC GAC integration with new GAC variables, refactoring of TANF-related components, and expanded test coverage with updated legal references to ensure accurate GAC/TANF policy modeling. Implemented SNAP work requirements baseline and reforms, including ABAWD rules and exemptions, with accompanying test coverage to align with updated SNAP policy and sunset provisions. Added DC-specific TANF work requirements with POWER integration, working status tracking, and exemptions, supported by targeted tests. Fixed hours calculation foundation by aligning the calculation period to MONTH (instead of YEAR), establishing a consistent baseline across income and hours logic and updating tests accordingly. Major improvements in test coverage, policy accuracy, and maintainability. Business impact includes more reliable policy modeling for DC programs, reduced compliance risk, and faster scenario-based decision support for policy teams.

May 2025

22 Commits • 7 Features

May 1, 2025

May 2025 monthly summary for PolicyEngine development: Delivered key policy and calculation enhancements across policyengine-us with UI polish and expanded test coverage, plus a staff page update in policyengine-app. Highlights include improved calculation accuracy and robustness, expanded SSN policy and enum support across EITC fixes, reconciliation, and CTC reform fixes, and successful merge conflict resolution during integration. Business value delivered includes a more reliable tax policy engine, stronger compliance with SSN-related rules, and reduced merge risk, enabling safer future changes and faster onboarding of contributors. Technologies demonstrated: refactoring, enum design and extension, formula and calculation optimization, UI/formatting improvements, test adjustments, and cross-repo collaboration.

April 2025

35 Commits • 10 Features

Apr 1, 2025

April 2025 monthly summary for PolicyEngine/policyengine-us highlighting key feature deliveries, major bug fixes, business impact, and demonstrated technical skills.

March 2025

22 Commits • 11 Features

Mar 1, 2025

March 2025 monthly summary for PolicyEngine/policyengine-us. Focused on delivering policy updates, refactors, and maintenance to improve accuracy, maintainability, and business value. Key updates include consolidating Massachusetts state supplement logic, introducing new policy features for state tax rules, updating 2024 parameters for Hawaii and Iowa, and enabling uprating capabilities. Comprehensive changelog/documentation work and targeted maintenance were completed to support faster future updates and better traceability.

Activity

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Quality Metrics

Correctness91.0%
Maintainability90.4%
Architecture89.6%
Performance85.4%
AI Usage20.4%

Skills & Technologies

Programming Languages

JavaScriptPythonYAMLpythonyaml

Technical Skills

Backend DevelopmentCode DocumentationCode FormattingCode RefactoringConfigurationConfiguration ManagementData ConfigurationData EngineeringData ManagementData ModelingData ValidationDeduction Phase-outsDocumentationEligibility DeterminationEligibility Rules

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

PolicyEngine/policyengine-us

Mar 2025 Aug 2025
6 Months active

Languages Used

PythonYAMLpythonyaml

Technical Skills

Backend DevelopmentCode FormattingConfiguration ManagementData ManagementData ModelingDeduction Phase-outs

PolicyEngine/policyengine-app

May 2025 May 2025
1 Month active

Languages Used

JavaScript

Technical Skills

Front End Development

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