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Jonathan Schnéider

PROFILE

Jonathan Schnéider

Josh Schneider led engineering efforts on the openrewrite/rewrite repository, delivering cross-language code transformation and migration tooling for Java, JavaScript, Python, and C#. He architected robust parser integrations and automated refactoring workflows, leveraging Java, TypeScript, and Python to enable safe, large-scale codebase modernization. His work included building RPC frameworks for remote recipe execution, enhancing static analysis with advanced data flow and taint analysis, and implementing CSV-driven recipe marketplaces. By focusing on maintainable build automation, dependency management, and documentation, Josh ensured reliable CI/CD and onboarding. The depth of his contributions reflects strong backend development, code analysis, and multi-language interoperability expertise.

Overall Statistics

Feature vs Bugs

83%Features

Repository Contributions

220Total
Bugs
21
Commits
220
Features
105
Lines of code
291,574
Activity Months20

Work History

April 2026

1 Commits • 1 Features

Apr 1, 2026

April 2026: The rewrite-static-analysis module gained substantial documentation improvements focused on self-documentation and clarity. A commit enriched 98 recipe descriptions with rationale for RSPEC-tagged rules, addressing decommissioned public rule URLs and reducing external dependencies. 9 recipes were skipped because they already contained thorough rationale. Descriptions were reformatted to wrap around ~120 characters for better readability, contributing to maintainability and onboarding efficiency.

March 2026

5 Commits • 3 Features

Mar 1, 2026

March 2026 performance summary focusing on cross-language migration capabilities, reliability improvements, and business value delivered. Focus areas include Java Lombok enhancements, DataNucleus migration automation, C# syntax support via Roslyn, and Kotlin path-resolution bug fixes, delivering safer code transformations and reduced manual migration effort across repositories.

February 2026

27 Commits • 17 Features

Feb 1, 2026

February 2026 monthly summary focused on expanding cross-language automation, analytics, and build reliability across the OpenRewrite suite. Delivered a multi-faceted set of features and stability improvements that directly enhance business value: cross-language recipe execution, richer code-generation capabilities, and improved data visibility, while simplifying CI/CD and modernization efforts.

January 2026

30 Commits • 14 Features

Jan 1, 2026

Month 2026-01 recap focusing on delivering business value through cross-language capabilities, robust dependency migrations, and improved parser/formatting quality across OpenRewrite and related repos. Key features delivered include Python language support and interop in OpenRewrite, enabling automated Python refactoring workflows; Gradle dependency management enhancements to upgrade literal version strings in Spring dependency management plugin entries and preserve strict version semantics; Maven-related robustness improvements to ensure consistent version updates across recipe listings, improved Maven context propagation during parsing and execution, and automatic handling of exclusions when dependency coordinates change; JavaScript/TypeScript parsing and formatting improvements, including protection against null spaces in printing, handling of invalid surrogate pairs, and IntelliJ-style formatting options for record components and method call arguments; Import handling improvements with type attribution for unfolded star imports to ensure downstream recipes can reliably match and transform imports.

December 2025

30 Commits • 14 Features

Dec 1, 2025

Performance summary for 2025-12 detailing multi-repo contributions across openrewrite and ecosystem repos. Key features include dependency visualization improvements with ExplainDependenciesInUse, recipe marketplace enhancements with RPC and CSV data handling, and broad CSV export capabilities; expanded recipe catalogs with new categories; CSV data sources and validators; and internal cleanup to streamline future work. These initiatives delivered measurable business value by improving visibility, migration speed, data-driven decision support, and discoverability for users and partners.

November 2025

7 Commits • 2 Features

Nov 1, 2025

November 2025 delivered meaningful business value through targeted features for RecipeMarketplace, enhanced CSV-based recipe management, and automation tooling, while stabilizing core parsing logic. Key architectural improvements include isolated class loading for recipes (RecipeClassLoader) and TypeInUse support, improved CSV schema handling and metadata, and a two-phase resolution system for recipe bundles in openrewrite. The rewrite-build-gradle-plugin gained automated CSV generation and validation tasks to tighten QA. A rollback of the ANTLR-based Dockerfile parser was executed to restore stable behavior. These changes collectively improve recipe quality, onboarding speed for contributors, reproducibility of builds, and overall system reliability, with clear demonstrations of advanced Java/Kotlin ecosystem skills and Gradle/Maven-based workflows.

October 2025

18 Commits • 6 Features

Oct 1, 2025

OpenRewrite: October 2025 monthly summary focusing on delivering robust JavaScript code cleanup, enhanced preconditions and search capabilities, improved RPC/recipe loading, and marketplace data standardization, complemented by documentation updates and developer tooling enhancements.

September 2025

15 Commits • 6 Features

Sep 1, 2025

September 2025 monthly summary for openrewrite/rewrite focusing on delivering key features, stabilizing cross-language support, and improving packaging and test infrastructure. Delivered targeted JavaScript enhancements, improved RPC/AST handling, expanded type mapping, and introduced a method-agnostic FindDistinctMethods recipe. Also implemented packaging improvements and a cleanups in test infrastructure, plus a bug fix for HCL heredoc trailing comments. The work emphasizes business value through more reliable, efficient, and scalable code transformations across Java and JavaScript ecosystems.

August 2025

5 Commits • 2 Features

Aug 1, 2025

OpenRewrite's August 2025 release focused on stability, reliability, and maintainability for the rewrite repository. Key work centered on the JavaScript Rewrite RPC, delivering a stable, configurable execution path via npx (no zip bundling) with timeout and large-file handling controls, plus installation directory preparation to streamline runtime recipes installs. In parallel, the build system and dependencies were cleaned up by removing explicit JUnit version pinning and reducing unnecessary external dependencies, including the removal of InlineMe annotations, to improve Gradle resolution and reduce build fragility. These changes improve developer workflow, reduce setup complexity, and increase resilience of large-file operations.

July 2025

5 Commits • 4 Features

Jul 1, 2025

July 2025 monthly summary focusing on delivering key features, fixing critical bugs, and strengthening observability and documentation across the OpenRewrite ecosystem. The month emphasized business value through safer code, clearer diagnostics, and consistent presentation of configuration and capabilities.

June 2025

8 Commits • 3 Features

Jun 1, 2025

June 2025 monthly summary focusing on key accomplishments across three repositories: moderne-docs, rewrite, and rewrite-maven-plugin. Delivered user-facing documentation enhancements, a developer-focused AI guide, and a maintenance-oriented dependency update. Implemented a critical reliability fix for Maven property resolution, and performed targeted codebase cleanup to simplify maintenance.

May 2025

6 Commits • 4 Features

May 1, 2025

May 2025 monthly summary: Delivered breadth of improvements across three repositories, focusing on language support, code quality, and observability. Key features include JavaScript language support integrated into OpenRewrite with a new parser and AST integration, plus semantic updates to represent JavaScript constructs via the AST. Reduced maintenance burden via dependency cleanup and clarified Java AST documentation. Simplified the default static analysis configuration to broaden applicability. Fixed logger attribution for improved observability in Spring Data REST. These efforts collectively expand language coverage, improve security and maintainability, and enable faster onboarding for users and contributors.

April 2025

11 Commits • 5 Features

Apr 1, 2025

Month: 2025-04 Concise monthly summary for performance review focusing on business value and technical achievements across two repositories (moderneinc/moderne-docs and openrewrite/rewrite). Key features delivered: - Moderne Source Available License: Prohibit specified third-party access and AI code-analysis tools. This update explicitly lists prohibition targets (e.g., Sourcegraph and Sourcegraph Batch Changes, Amazon Q Code Transformer, Broadcom Application Advisor) to align with evolving AI tooling usage. Commits: f745340342f80599ee532285fc84a3c78ad50448, 4c6df85f9c7604ff08a0f6fdffec832405611ed6. - Rewrite core/config taxonomy improvements: Added top-level and root categories (tech and software) to improve recipe discovery and organization. Commits: 619a67aec7eae5271296406a6a8e67cd13668aa6, ef702a72be2bbf6a932051254913aa86aab69c5a. - Code hygiene: Remove unused Recipe#isScanning to simplify codebase. Commit: a71985e0f48c90521416f40e72528ef6b3fce76c. Major bugs fixed: - Reverted regressions affecting Maven home resolution (M2_HOME support), SnowflakeId return type, and TimeRules date handling to restore previous stable behavior. Commits: 7f46465cef83870e800422a5ebfacb4ce2ff7f80, 59c39d0b357ba17acffc4f03513f7170e5f69d8c, 8098e35cfe514227066024d10389dcb50488b26. Other improvements (quality and performance): - Annotation processing improvements and NPE resilience: added null checks in AnnotationMatcher and optimized precondition checks in FindAnnotations. Commits: a344e18ff346684b0ad9d18cedc57868c1ca0ab6, 174d5da9495373a425cf600bf006072a5c30f18a. - Improve Git provenance date handling by using LocalDate.ofInstant for commit date processing. Commit: 90219bda7d08ff88e6c098c1b8b0e7bc8bfffafd. Overall impact and accomplishments: - Strengthened compliance posture and risk management through explicit licensing controls. - Restored stable core behaviors across build and provenance handling, reducing occurrence of regressions. - Improved code organization and maintainability in rewrite, enabling faster feature delivery and clearer categorization for end users. - Demonstrated proficiency in policy governance, Java code maintenance, and performance-oriented refactoring. Technologies/skills demonstrated: - Java, license policy governance, code hygiene, performance optimization, date handling with LocalDate, and contributing to open-source, multi-repo projects.

March 2025

9 Commits • 4 Features

Mar 1, 2025

March 2025 performance snapshot across four repositories, delivering per-repo configuration, robustness, and build stability improvements. Key outcomes include per-repo Java version specification for cloning, core robustness fixes for recipe processing, YAML mapping capabilities, and a streamlined build/configuration flow, collectively enabling safer automation, improved developer productivity, and more reliable CI pipelines.

February 2025

9 Commits • 4 Features

Feb 1, 2025

February 2025 monthly summary focusing on feature delivery, documentation quality, and offline deployment guidance across the rewrite and moderne-docs repositories. The month delivered a robust RPC framework for remote recipe execution, AI readiness via core configuration taxonomy, and usability improvements for recipes, complemented by air-gapped installation enhancements for offline environments. No major bug fixes are documented in the provided data; the emphasis was on delivering business value through automation capabilities and maintainability enhancements.

January 2025

2 Commits • 2 Features

Jan 1, 2025

January 2025 monthly summary for openrewrite/rewrite focused on deliverables, impact, and skills demonstrated in the repo.

December 2024

27 Commits • 10 Features

Dec 1, 2024

December 2024 performance summary for Moderne/OpenRewrite initiatives. Focused on licensing modernization and automation across the codebase, with major improvements in license governance, compliance automation, and stability of type-mapping features. Delivered standardized licensing across ten repositories, introduced plugin-based license management, and enhanced license header handling to streamline builds and reduce risk. Completed a significant Java type-mapping bug fix to improve correctness in generics and reflection handling.

November 2024

3 Commits • 2 Features

Nov 1, 2024

Month 2024-11 — OpenRewrite/rewrite focused delivery and reliability improvements. The team delivered Lombok-related enhancements in the Java parser, stabilized runtime behavior across Java versions, and improved documentation to reduce API confusion. This combination expands OpenRewrite’s usefulness for Lombok-heavy codebases, reduces crash scenarios, and strengthens maintainability across the repository.

August 2024

1 Commits • 1 Features

Aug 1, 2024

August 2024: Key focus on improving type safety and nullability in openrewrite/rewrite by migrating to JSpecify annotations, replacing deprecated JSR-305 meta-annotations. This enhancement reduces null-related runtime risk and strengthens static analysis, laying groundwork for safer refactors and future features.

July 2024

1 Commits • 1 Features

Jul 1, 2024

July 2024 (2024-07) monthly summary for openrewrite/rewrite focused on code quality improvements. Key feature delivered: Code Quality Improvement — move @Nullable to the return type for removeMethods. This refactor places @Nullable on the return type rather than the method signature, enhancing clarity, reducing ambiguity for callers, and improving maintainability. Implemented in a focused, single commit: bc7bc7a485dadbccf5c502e73db94b32ce0b39cf. Impact: clearer API contracts, better downstream tooling compatibility, and a smoother path for future refactors. Major bugs fixed: none reported in the provided data. Accomplishments: delivered a precise, low-risk change with a clear commit message, improving codebase consistency and maintainability. Technologies/skills demonstrated: Java annotations and refactoring discipline, code review hygiene, minimal-risk change strategy, and collaboration within openrewrite/rewrite.

Activity

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Quality Metrics

Correctness95.2%
Maintainability91.0%
Architecture92.0%
Performance88.0%
AI Usage26.6%

Skills & Technologies

Programming Languages

ANTLRC#CSVGradleGroovyJSONJavaJavaScriptKotlinMarkdown

Technical Skills

AI IntegrationAI integrationAI-assisted DevelopmentANTLRAPI DesignAPI DevelopmentAPI IntegrationAPI developmentAST ManipulationAST ParsingAST manipulationAnnotation ProcessingApache HttpClientApache library migrationAutomated refactoring

Repositories Contributed To

15 repos

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

openrewrite/rewrite

Jul 2024 Mar 2026
19 Months active

Languages Used

JavaGradleKotlinGroovyShellYAMLTypeScriptMarkdown

Technical Skills

Code RefactoringJavaStatic AnalysisSoftware DevelopmentAnnotation ProcessingBuild Tooling (Gradle)

openrewrite/rewrite-migrate-java

Dec 2024 Mar 2026
6 Months active

Languages Used

JavaKotlinMarkdownYAMLCSVXML

Technical Skills

Build ConfigurationCode RefactoringGradleLicense ManagementProject ConfigurationAI-assisted Development

moderneinc/moderne-docs

Dec 2024 Feb 2026
8 Months active

Languages Used

MarkdownTypeScriptJavaYAML

Technical Skills

Code OrganizationDocumentationLegalTechnical WritingLegal ComplianceLicensing

openrewrite/rewrite-build-gradle-plugin

Dec 2024 Dec 2025
3 Months active

Languages Used

GradleJavaKotlin

Technical Skills

Build AutomationBuild Tool ConfigurationConfiguration ManagementGradleGradle Plugin DevelopmentJava

openrewrite/rewrite-testing-frameworks

Dec 2024 Feb 2026
4 Months active

Languages Used

JavaKotlinMarkdownYAMLCSV

Technical Skills

Build AutomationGradleJava DevelopmentLicense ManagementProject ConfigurationYAML configuration

openrewrite/rewrite-static-analysis

Dec 2024 Apr 2026
7 Months active

Languages Used

JavaKotlinMarkdownYAML

Technical Skills

Build ConfigurationCode FormattingGradleLicensingProject ManagementConfiguration Management

openrewrite/rewrite-apache

Dec 2024 Feb 2026
4 Months active

Languages Used

GradleJavaYAML

Technical Skills

Build ConfigurationLicensingApache library migrationJavaYAML configurationbackend development

openrewrite/rewrite-spring

Dec 2024 Feb 2026
4 Months active

Languages Used

JavaKotlinMarkdownYAMLCSV

Technical Skills

Build ConfigurationFile ManagementLicense ManagementProject ConfigurationSpring frameworkbackend development

openrewrite/rewrite-docs

Oct 2025 Jan 2026
2 Months active

Languages Used

JavaMarkdownShellYAMLJSONJavaScriptTypeScript

Technical Skills

AI IntegrationAPI IntegrationCode GenerationDocumentationScriptingSoftware Development Tools

openrewrite/rewrite-logging-frameworks

Dec 2024 Feb 2026
3 Months active

Languages Used

JavaKotlinYAML

Technical Skills

Build AutomationCodebase MaintenanceGradleLicense ManagementJavadata processing

openrewrite/rewrite-maven-plugin

Dec 2024 Feb 2026
3 Months active

Languages Used

JavaXMLYAML

Technical Skills

Build Tool ConfigurationLicensingMavenDevOpsGitHub Actions

openrewrite/rewrite-rewrite

Mar 2025 Feb 2026
4 Months active

Languages Used

JavaYAMLCSV

Technical Skills

AST ManipulationJava DevelopmentTestingVisitor PatternYAML ProcessingConfiguration Management

openrewrite/rewrite-java-dependencies

Dec 2025 Feb 2026
3 Months active

Languages Used

CSVJavaYAML

Technical Skills

Javadata managementdata processingfile handlingDependency ManagementStatic Analysis

moderneinc/rewrite-recipe-starter

Mar 2025 Dec 2025
2 Months active

Languages Used

KotlinPython

Technical Skills

Build ConfigurationGradleCSV generationdata processingfile handling

spring-projects/spring-data-rest

May 2025 May 2025
1 Month active

Languages Used

Java

Technical Skills

LoggingRefactoring