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Edwin Tan

PROFILE

Edwin Tan

Over 20 months, this developer delivered robust features and stability improvements across the MeasureAuthoringTool suite, focusing on measure and library authoring, sharing, and governance. They enhanced user workflows in repositories like madie-measure and measure-service by implementing ownership transfer, audit logging, and advanced validation, using Java, React, and Spring Boot. Their work included building reusable UI components, integrating FHIR data models, and optimizing backend APIs for reliability and security. By refining caching, access control, and error handling, they improved data integrity and user experience. Their approach emphasized maintainable code, comprehensive testing, and cross-repo consistency to support scalable, compliant healthcare tooling.

Overall Statistics

Feature vs Bugs

80%Features

Repository Contributions

383Total
Bugs
35
Commits
383
Features
138
Lines of code
304,553
Activity Months20

Work History

June 2026

16 Commits • 6 Features

Jun 1, 2026

Overview: June 2026 delivered user-centric ownership and sharing enhancements across Measure and Library tooling, improved representation of users in shared contexts, and expanded administrative governance. Stability and quality initiatives were completed to support ongoing delivery and larger code files. Key features delivered: - Measure: Improve user identity and ownership display in UI (ownerDisplayName in madie-model); show owner's display name in Transfer Measure Ownership popup; display user names in Share dialog; commits MAT-9997, MAT-9998, and ownerDisplayName addition. - Library: Library Ownership and Sharing UI Enhancements; show owner display name in Transfer Library Ownership popup and display user names in Shared With/ confirmations; commits MAT-9997, MAT-9998. - measure-service: SharedUser displayName enhancement; update MeasureService/MeasureSetService to use displayName; added tests for formatting and MVC output; commit MAT-9998 (getSharedMeasures) and test updates; also increased checkstyle max file length (MAT-9998). - cql-library-service: Shared User Display Name in getSharedLibraries; Admin Library Management: hard delete by library version ID with tests, docs, and improved error handling/logging; commits MAT-9998 and MAT-9892-related changes. - Cross-repo consistency and testing: updated MVC tests for displayName across services and libraries. Major bugs fixed: - Reverted @madie/madie-models to stable 1.4.62 to maintain compatibility after model version revert until 1.4.66 is published; adjusted type handling in TransferDialog and TransferredMeasuresTable accordingly. - Enhanced error handling/logging for ResourceNotFoundException and HarpIdMismatchException (ErrorHandlingControllerAdvice) with warnings and type-specific logging. Overall impact and accomplishments: - Improved ownership clarity and collaboration through consistent ownerDisplayName across measures and libraries; clearer sharing workflows; stronger governance via admin deletion capability and safer error handling. Expanded test coverage and relaxed static analysis constraints to accommodate larger files, improving maintainability and future delivery velocity. Technologies/skills demonstrated: - Java/Spring MVC, REST API and UI integration, data model evolution (ownerDisplayName, displayName), testing strategy (MVC tests, unit tests), logging and error handling improvements, code quality practices (checkstyle), and cross-repo coordination for cohesive feature delivery.

May 2026

32 Commits • 14 Features

May 1, 2026

In May 2026, the Measure Authoring Tool engineering effort focused on performance, security, and UX enhancements across the suite, delivering a robust caching layer, unified access controls, and design-system-driven UI improvements that collectively boost reliability, security, and developer productivity. The work spanned multiple repositories with coordinated changes to caching, security, and user-facing features, while maintaining strong test coverage and code quality.

April 2026

11 Commits • 2 Features

Apr 1, 2026

April 2026 (2026-04) focused on strengthening data integrity, auditability, and maintainability in MeasureAuthoringTool/measure-service. Delivered major improvements to composite measures management, introduced robust logging and validation, enhanced draft handling, and upgraded infrastructure tooling and seed data processes to improve consistency across environments. These changes reduce data drift, improve traceability of measure composition changes, and lay groundwork for safer releases and easier testing.

March 2026

12 Commits • 8 Features

Mar 1, 2026

March 2026 monthly engineering summary for the Measure Authoring Tool (Performance Review). The team delivered impactful features and stability improvements across four repositories, strengthening user experience, data integrity, performance, and test coverage. Key initiatives focused on ownership transfer UX, data migrations with rollback, performance optimizations, front-end validation, and race-condition mitigation in persistence logic.

February 2026

4 Commits • 2 Features

Feb 1, 2026

February 2026: Strengthened data integrity, improved error feedback, and stabilized builds across the Measure Authoring Tool. Delivered validated measure references, enhanced reference validation in Java models, fixed build issues, and cleaned HTML-to-Markdown output.

January 2026

23 Commits • 7 Features

Jan 1, 2026

January 2026 focused on delivering enhanced diff/compare workflows for measures and CQL libraries, improving data entry flexibility, and stabilizing the build and UI consistency. Key outcomes include enhancements to the Compare Versions dialogs (measure and library) with sticky headers, draggable behavior, and clearer CQL diffs; optional Participant attributes across entities; targeted test infrastructure cleanup; and UI/UX improvements to MadieDialog scroll styling. These changes improve user efficiency in version comparisons, reduce data-entry friction, and lower maintenance burden through code quality and build stability improvements.

December 2025

10 Commits • 6 Features

Dec 1, 2025

December 2025 focused on delivering user-facing enhancements, improving UI stability, and simplifying feature toggles across the Measure Authoring Tool suite to accelerate delivery and reduce maintenance. Highlights include a new human-readable content panel in the Compare Measure Versions dialog, UI/UX stabilizations for the CompareVersionsDialog, and removing feature flags to enable always-on search, library, and transfer/history features across multiple services. Additionally, validation flow was streamlined by removing the STU6 flag. These efforts result in faster workflows, more consistent user experiences, and easier future maintenance. Technologies demonstrated include React/JS UI work, CSS refactoring, Codacy-aligned styling, and feature-flag management.

November 2025

30 Commits • 11 Features

Nov 1, 2025

November 2025 across the MeasureAuthoringTool suite delivered targeted features, robust fixes, and UX improvements that increase reliability, security, and user efficiency. The work across measure-service, cql-library-service, madie-measure, and madie-cql-library reduced error surface, improved ownership transfer workflows, and aligned UI components with the latest design standards.

October 2025

9 Commits • 5 Features

Oct 1, 2025

October 2025 monthly summary for MeasureAuthoringTool projects. Delivered new reusable data components, enhanced history and audit capabilities, and strengthened test coverage across madie-measure and measure-service. The work improves data integrity, traceability, and developer velocity, enabling safer edits to measure data and more reliable export/history workflows.

September 2025

26 Commits • 6 Features

Sep 1, 2025

Month: 2025-09 Concise monthly summary focusing on business value and technical achievements across the MeasureAuthoringTool suite. Key features delivered: - madie-fhir-service: Resource packaging and data model enhancements for value sets and EventTiming. Updated value sets validation bundle with multiple canonical references for CommunicationTopic, added contains elements to EventTiming XML, and packaging updates to improve data validation and timing configuration. - madie-measure: Money handling enhancements with a reusable MoneyComponent, currency input integration with Formik, and updated FHIR utilities to recognize money datatype. - Test case builder and UI improvements: Timing reusable component, DeleteDisabledIcon, warnings for missing/irrelevant data elements, support for empty arrays, and overall test stability improvements. - Share/unshare enhancements: Expanded sharing controls including unshare capabilities and related tests and measure list updates. - measure-service and madie-layout: Measure sharing unshare capability introduced; code formatting cleanup in measure-service; unshare/refined actions in the Measure Action Center. Major bugs fixed: - Measure Retrieval Loading State Bug: Ensured loading state is set at the start of measure retrieval to prevent race conditions and stale updates. Overall impact and accomplishments: - Increased data integrity and validation through enhanced value set packaging and EventTiming configuration, enabling more reliable data processing and timing behaviors. - Improved user experience and flexibility in measures: monetary data entry, robust test case tooling, and seamless share/unshare workflows. - Enhanced test stability and build quality across the toolchain, contributing to faster iteration and fewer regressions. Technologies/skills demonstrated: - Frontend: React/TypeScript, Formik integration, UI/UX improvements, test case builder components, timing components. - Data modeling/FHIR: Value sets packaging, EventTiming enhancements, money datatype utilities. - DevOps/Code quality: Packaging workflows, code formatting cleanups, test coverage expansions.

August 2025

28 Commits • 12 Features

Aug 1, 2025

August 2025 focused on delivering user-facing UI improvements, robust test-case tooling, and foundational platform hygiene across MeasureAuthoringTool modules. Key outcomes include improved measures and libraries navigation UX, safer state management, enhanced audit logging, and performance-oriented refactors that support scalable ownership views and more reliable test-case workflows. Notable design-system upgrade and UI refactors align with long-term design consistency and maintainability. These efforts collectively drive business value by improving measure discovery, ownership clarity, compliance/audit traceability, and developer velocity through cleaner state management and test coverage.

July 2025

33 Commits • 10 Features

Jul 1, 2025

July 2025 performance summary: Delivered targeted UI and data-model improvements across the Measure Authoring Tool suite to improve accuracy, usability, and governance, while maintaining stability through careful dependency management. Key outcomes include UI enhancements for measure editing, Rich Text Editor integration, improved notation validation, CMS ID-based search enhancements for Qi-Core measures, and library ownership/scope improvements. Design system upgrades were applied with a controlled rollback for issues, followed by stabilization and security patches (npm audit fixes).

June 2025

17 Commits • 4 Features

Jun 1, 2025

June 2025 monthly recap for MeasureAuthoringTool: Delivered core RAV readiness and UI/content enhancements across measure-service, madie-measure, and madie-layout; stabilized test case versioning workflows and navigation; improved accessibility; and removed redundant feature flags to simplify deployment. These efforts advance risk adjustment capabilities, improve measure reference accuracy, support accessible UX, and boost developer velocity across the suite.

May 2025

19 Commits • 9 Features

May 1, 2025

May 2025 performance summary for the MADiE measure-authoring suite. Delivered key features, improved data integrity, and enhanced UX and reliability across multiple repositories. Upgraded core dependencies to 3.24.0, implemented Risk Adjustment Variables (RAV) with feature flags and data-model updates, centralized alert messaging, and strengthened audit logging. Addressed data integrity and validation gaps, stabilized tests, and refined UI text and components for a clearer user experience.

April 2025

28 Commits • 7 Features

Apr 1, 2025

April 2025 performance summary focused on strengthening data integrity, reliability, and end-to-end measure workflows across the MeasureAuthoringTool suite. Delivered targeted feature work with robust validations, improved error messaging, and UI behavior refinements, while hardening versioning and CMS ID association processes. Achievements span UI, API, and test stability, delivering tangible business value through fewer data/configuration errors, clearer user guidance, and more reliable release readiness.

March 2025

17 Commits • 5 Features

Mar 1, 2025

2025-03 Monthly Summary for Measure Authoring Tool: The team delivered substantial improvements to the measure sharing workflow, expanded QI-Core manifest support behind a feature flag, and strengthened access control and observability across repositories. These changes reduce administrative overhead, improve security, and enable safer, controlled rollouts. Business value is driven by faster, more secure collaboration on measures and improved maintainability through code quality improvements.

February 2025

19 Commits • 8 Features

Feb 1, 2025

February 2025 monthly summary focused on key accomplishments across the MeasureAuthoringTool codebase. Delivered enhancements to testing reliability, expanded auditability for access control and sharing, extended multi-measure sharing capabilities, and advanced the user-facing sharing workflows. These efforts improved security/compliance, developer velocity, and overall system robustness across backend services and UI interactions.

January 2025

24 Commits • 9 Features

Jan 1, 2025

January 2025 performance summary for the MeasureAuthoringTool suite. Delivered user-facing authoring enhancements, strengthened data validation, and reinforced ownership-based access controls across measures and libraries. Focused on improving test case authoring, test reliability, and security posture, while maintaining high-quality code and approachable UX.

December 2024

14 Commits • 5 Features

Dec 1, 2024

December 2024 monthly summary for MeasureAuthoringTool teams. Delivered security-conscious, validated measure management features across measure-service and madie-measure, with strong emphasis on data integrity, test coverage, and maintainability. Key work includes a new CMS ID delete API with safeguards and admin-only access, improved measure validation to prevent NullPointerExceptions and enforce Improvement Notation for drafts, and code quality refinements. Frontend improvements introduced a dropdown navigation for Edit Test Case with expanded test coverage. Measure List enhancements now robustly handle drafts and export errors, with associated tests. Overall, these efforts boost reliability, security, and user guidance for measure authors while improving developer ergonomics and code quality.

November 2024

11 Commits • 2 Features

Nov 1, 2024

November 2024 performance summary focusing on delivering robust UI/UX refinements, data integrity improvements, and enhanced security for the MeasureAuthoringTool suite. The month delivered notable front-end feature work, critical bug fixes across CQL editors and library components, and foundational governance via ACL enhancements, resulting in stronger data quality, improved usability, and secure collaboration.

Activity

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Quality Metrics

Correctness94.4%
Maintainability91.8%
Architecture90.4%
Performance90.6%
AI Usage20.6%

Skills & Technologies

Programming Languages

CSSHTMLJSONJUnitJavaJavaScriptSCSSTSXTypeScriptXML

Technical Skills

API DevelopmentAPI IntegrationAPI RefactoringAPI SecurityAPI TestingAccess Control ManagementAccessibilityAggregation FrameworkBackend DevelopmentBackend IntegrationCI/CDCSSCachingCode FormattingCode Quality

Repositories Contributed To

10 repos

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

MeasureAuthoringTool/madie-measure

Nov 2024 Jun 2026
19 Months active

Languages Used

JavaScriptTypeScriptSCSSCSSHTMLtsxJavaJSON

Technical Skills

API IntegrationFront End DevelopmentTestingBackend DevelopmentForm HandlingFrontend Development

MeasureAuthoringTool/measure-service

Dec 2024 Jun 2026
18 Months active

Languages Used

JavaXMLYAMLJavaScript

Technical Skills

API DevelopmentAPI SecurityBackend DevelopmentCode RefactoringJavaJava Development

MeasureAuthoringTool/madie-cql-library

Nov 2024 Jun 2026
10 Months active

Languages Used

CSSJavaScriptSCSSTypeScriptJSON

Technical Skills

CSSFront End DevelopmentReactTypeScriptUI/UXFrontend Development

MeasureAuthoringTool/cql-library-service

Nov 2024 Jun 2026
9 Months active

Languages Used

JavaXMLJUnit

Technical Skills

API DevelopmentAccess Control ManagementBackend DevelopmentSpring BootCode FormattingError Handling

MeasureAuthoringTool/madie-layout

Feb 2025 May 2026
10 Months active

Languages Used

JavaScriptTypeScripttsxJSON

Technical Skills

Front End DevelopmentJestMaterial UIReactReact Testing LibraryTypeScript

MeasureAuthoringTool/madie-fhir-service

May 2025 May 2026
5 Months active

Languages Used

JavaXML

Technical Skills

Backend DevelopmentCode QualityFHIRJavaUnit TestingData Modeling

MeasureAuthoringTool/madie-editor

Nov 2024 Jan 2026
4 Months active

Languages Used

SCSSJavaScriptTypeScriptJSON

Technical Skills

CSSFront End DevelopmentForm HandlingFormikReactTesting

MeasureAuthoringTool/madie-qdm-elm-translation

May 2025 May 2026
2 Months active

Languages Used

XMLYAMLJava

Technical Skills

Configuration ManagementDependency ManagementJavaMavenMicroservicesREST API Development

MeasureAuthoringTool/madie-patient

Nov 2024 Nov 2024
1 Month active

Languages Used

JavaScriptTypeScript

Technical Skills

Front End DevelopmentReactTypeScript

MeasureAuthoringTool/madie-design-system

May 2025 May 2025
1 Month active

Languages Used

JavaScript

Technical Skills

Front End DevelopmentReact