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Jonathan Schnéider

PROFILE

Jonathan Schnéider

Over the past year, Jonathan Schneider led engineering efforts on the openrewrite/rewrite repository, delivering cross-language code transformation features and robust automation tooling. He implemented JavaScript and Java AST integration, enhanced RPC infrastructure for remote recipe execution, and introduced granular type mapping to improve code analysis accuracy. Using Java, TypeScript, and Gradle, Jonathan streamlined build automation, improved licensing compliance, and expanded static analysis capabilities. His work included developing configurable preconditions, optimizing annotation processing, and refining dependency management. By focusing on maintainability and reliability, Jonathan enabled safer, more scalable code transformations and contributed comprehensive documentation to support both users and contributors.

Overall Statistics

Feature vs Bugs

84%Features

Repository Contributions

118Total
Bugs
10
Commits
118
Features
52
Lines of code
117,895
Activity Months12

Work History

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.

Activity

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Quality Metrics

Correctness93.2%
Maintainability92.4%
Architecture91.6%
Performance86.4%
AI Usage23.2%

Skills & Technologies

Programming Languages

ANTLRGradleGroovyJavaJavaScriptKotlinMarkdownShellTypeScriptXML

Technical Skills

AI IntegrationAI-assisted DevelopmentANTLRAPI DesignAPI IntegrationAST ManipulationAST ParsingAnnotation ProcessingBackend DevelopmentBuild AutomationBuild ConfigurationBuild Script ManagementBuild ScriptingBuild System ConfigurationBuild Tool Configuration

Repositories Contributed To

14 repos

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

openrewrite/rewrite

Nov 2024 Oct 2025
12 Months active

Languages Used

GradleJavaKotlinGroovyShellYAMLTypeScriptMarkdown

Technical Skills

Annotation ProcessingBuild Tooling (Gradle)Code ParsingCompiler InternalsDocumentationJava Development

moderneinc/moderne-docs

Dec 2024 Jul 2025
6 Months active

Languages Used

MarkdownTypeScriptJavaYAML

Technical Skills

Code OrganizationDocumentationLegalTechnical WritingLegal ComplianceLicensing

openrewrite/rewrite-build-gradle-plugin

Dec 2024 Dec 2024
1 Month active

Languages Used

GradleJavaKotlin

Technical Skills

Build AutomationBuild Tool ConfigurationConfiguration ManagementGradleGradle Plugin DevelopmentJava

openrewrite/rewrite-static-analysis

Dec 2024 Jul 2025
3 Months active

Languages Used

JavaKotlinMarkdownYAML

Technical Skills

Build ConfigurationCode FormattingGradleLicensingProject ManagementConfiguration Management

openrewrite/rewrite-maven-plugin

Dec 2024 Jun 2025
2 Months active

Languages Used

JavaXML

Technical Skills

Build Tool ConfigurationLicensingMaven

openrewrite/rewrite-migrate-java

Dec 2024 Jul 2025
2 Months active

Languages Used

JavaKotlinMarkdownYAML

Technical Skills

Build ConfigurationCode RefactoringGradleLicense ManagementProject ConfigurationAI-assisted Development

openrewrite/rewrite-docs

Oct 2025 Oct 2025
1 Month active

Languages Used

JavaMarkdownShellYAML

Technical Skills

AI IntegrationAPI IntegrationCode GenerationDocumentationScriptingSoftware Development Tools

openrewrite/rewrite-logging-frameworks

Dec 2024 Dec 2024
1 Month active

Languages Used

JavaKotlinYAML

Technical Skills

Build AutomationCodebase MaintenanceGradleLicense Management

openrewrite/rewrite-spring

Dec 2024 Dec 2024
1 Month active

Languages Used

JavaKotlinMarkdownYAML

Technical Skills

Build ConfigurationFile ManagementLicense ManagementProject Configuration

openrewrite/rewrite-testing-frameworks

Dec 2024 Dec 2024
1 Month active

Languages Used

JavaKotlinMarkdownYAML

Technical Skills

Build AutomationGradleJava DevelopmentLicense ManagementProject Configuration

moderneinc/rewrite-recipe-starter

Mar 2025 Mar 2025
1 Month active

Languages Used

Kotlin

Technical Skills

Build ConfigurationGradle

openrewrite/rewrite-rewrite

Mar 2025 Jul 2025
2 Months active

Languages Used

JavaYAML

Technical Skills

AST ManipulationJava DevelopmentTestingVisitor PatternYAML ProcessingConfiguration Management

openrewrite/rewrite-apache

Dec 2024 Dec 2024
1 Month active

Languages Used

GradleJava

Technical Skills

Build ConfigurationLicensing

spring-projects/spring-data-rest

May 2025 May 2025
1 Month active

Languages Used

Java

Technical Skills

LoggingRefactoring

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