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Arthur Chan

PROFILE

Arthur Chan

Arthur Chan engineered automated fuzzing and testing infrastructure across the google/oss-fuzz and google/oss-fuzz-gen repositories, focusing on scalable build automation, cross-language harness generation, and robust CI workflows. He integrated Docker-based build environments and Python-driven scripting to streamline fuzz target onboarding, expanded coverage for C, C++, Rust, and Java projects, and standardized test execution with run_tests.sh scripts. Arthur’s work included prompt engineering for LLM-assisted build script generation, dependency management, and error handling improvements, resulting in faster feedback cycles and reproducible builds. His contributions deepened fuzzing coverage, improved reliability, and enabled maintainable, CI-friendly workflows for large-scale open source security testing.

Overall Statistics

Feature vs Bugs

74%Features

Repository Contributions

232Total
Bugs
22
Commits
232
Features
64
Lines of code
18,256
Activity Months16

Work History

March 2026

8 Commits • 5 Features

Mar 1, 2026

In March 2026, delivered targeted fuzzing enhancements and build fixes across google/oss-fuzz and FreeRADIUS/freeradius-server, enabling deeper fuzz coverage, improving CI stability, and aligning with upstream changes. Key features include enabling Radius and VICI support in StrongSwan for fuzzing (and removing a circular-dependency workaround), LibSSH fuzzing improvements with correct mock server linking and an upstream-gated client mock build, increased PJSIP fuzz input length for more thorough SIP parsing tests, and ExprTK's run_tests.sh script to optimize build size and time. FreeRADIUS received a JSON parsing fuzzer addition and a build fix by injecting libjson-c, reducing Dockerfile-related build failures. Overall, these changes enhanced fuzzing coverage, reduced maintenance friction, and demonstrated strong capability in dependency management, scripting, and upstream alignment.

February 2026

4 Commits • 2 Features

Feb 1, 2026

February 2026 monthly summary for google/oss-fuzz focusing on fuzzing integration and notification improvements. Delivered fuzzing coverage enhancements for critical components and streamlined CI workflows, supported by targeted build fixes and Dockerfile updates, plus expanded auto_ccs to improve team notifications.

January 2026

21 Commits • 6 Features

Jan 1, 2026

January 2026 monthly summary: Expanded automated testing and build reliability across the OSS-Fuzz project. Implemented run_tests.sh automation across 7 batch PRs covering 30+ libraries, integrated with Chronos for cached builds, and updated project configurations to improve CI feedback and fuzzing coverage. Stabilized builds with targeted fixes (Dockerfile COPY syntax across libical, geos, libwebsockets, pjsip; StrongSwan debug log disabled; LibCoAP build adjusted to avoid enabling OpenSSH). Enhanced fuzzing coverage and infrastructure, including GPSD auto_ccs updates and new fuzzers, and broadened test scope with run_tests.sh for Spotify-JSON, glog, libarchive, Poco Hoexttown, libredwg, and minizip.

December 2025

64 Commits • 18 Features

Dec 1, 2025

December 2025 OSS-Fuzz monthly summary: Expanded and standardized the run_tests.sh test harness across the google/oss-fuzz ecosystem, enabling consistent test execution, faster feedback cycles, and more reliable fuzzing workflows. Delivered batch-wide integration of run_tests.sh across dozens of projects with Chronos support, including targeted fixes to ensure unit/integration tests run smoothly within cached builds. Introduced SVN-aware integrity checks for run_tests.sh and infrastructure optimizations such as Dockerfile-driven repo cloning for select projects to speed up builds. Extended test coverage to SleuthKit, SIMDUTF, Libical, LibUCL, and other repos, improving visibility into test outcomes. Result: faster PR validation, higher reproducibility of test results, and a more scalable, developer-friendly testing infrastructure.

October 2025

1 Commits • 1 Features

Oct 1, 2025

October 2025 monthly summary for google/oss-fuzz: Key features delivered: Kea DHCP fuzzing integration into OSS-Fuzz, including a Dockerfile with dependencies, a build script, and project configuration to enable fuzzing builds. Major bugs fixed: None reported this month; this effort focused on feature delivery and fuzzing groundwork. Overall impact and accomplishments: Expands OSS-Fuzz coverage for Kea DHCP, enabling automated vulnerability discovery and earlier detection of defects, while providing a reproducible, CI-friendly fuzzing environment. Technologies/skills demonstrated: Docker-based build environments, fuzzing harness integration, build scripting, OSS-Fuzz configuration, and cross-repo collaboration.

September 2025

12 Commits • 3 Features

Sep 1, 2025

2025-09: Key fuzzing feature deliveries, infrastructure improvements, and build/coverage fixes across core OSS-Fuzz targets to improve defect detection, stability, and coverage accuracy. Highlights: libmicrohttpd2 fuzzing enhancements with new fuzz targets and tests; Monero fuzzers build/seed corpus improvements; Chronos infrastructure enhancements; ANGLE build/coverage fixes. Result: higher fuzzing reliability, faster triage, and clearer coverage signals across repositories.

August 2025

10 Commits • 2 Features

Aug 1, 2025

August 2025 OSS-Fuzz contributions for google/oss-fuzz focused on feature integrations and expanded fuzzing coverage to accelerate vulnerability discovery and improve CI reliability. Key deliverables include Chromium-angle fuzzing integration (Dockerfile, build scripts, fuzz configurations for SHA1 and translator fuzzing, and updated project.yaml) and Libmicrohttpd2 fuzzing integration with expanded coverage (new fuzz targets across string processing, cryptographic operations, daemon request processing; additional fuzzers for MHD_String and MHD_Connection). Included blockers fixes to improve robustness. Impact: broader fuzzing surface, faster feedback loops, and reduced risk for downstream projects. Technologies demonstrated: Docker, build automation, fuzz target development, OSS-Fuzz configuration, and cross-repo integration.

June 2025

11 Commits • 3 Features

Jun 1, 2025

June 2025 monthly summary for OSS fuzzing initiatives. Delivered major enhancements to fuzzing context, API surface, and reliability across two repositories (google/oss-fuzz-gen and google/oss-fuzz). Implemented new type information endpoints, cross-reference-aware prompt context, robust error handling, and improved runner resilience, complemented by PostgreSQL fuzzing reactivation to expand coverage.

May 2025

4 Commits • 1 Features

May 1, 2025

May 2025 monthly summary for google/oss-fuzz-gen: Delivered reliability and usability improvements through per-project build isolation, project naming normalization to lowercase, and enhanced build script generation prompts and guidelines. These changes reduce cross-contamination, prevent environment/name-related failures, and improve onboarding and maintainability for OSS-Fuzz projects across the team and future contributions.

April 2025

15 Commits • 3 Features

Apr 1, 2025

Month: 2025-04 — Delivered end-to-end build script generation automation for google/oss-fuzz-gen with LLM-assisted workflows, added KConfigBuildScanner for KConfig-based projects, and enhanced chat_llm history and prompts. Implemented reliability and performance improvements via auto-discovery agents and Docker-based testing, plus targeted bug fixes to improve correctness and stability. These initiatives broaden automation coverage, accelerate fuzzing harness delivery, and improve maintainability across build pipelines.

March 2025

20 Commits • 6 Features

Mar 1, 2025

March 2025 monthly summary for the OSS-fuzz projects (google/oss-fuzz-gen and google/oss-fuzz). Focused on delivering reliable AI-assisted prompt tooling and expanding fuzzing coverage across Java modules and core fuzzing paths. The team delivered targeted features with improvements in prompt construction, cross-language consistency, and maintainability, while increasing test coverage and robustness through a scaled fuzzing infrastructure and seed corpus introductions. These efforts collectively reduce release risk, improve safety and reliability of prompts, and enable broader, safer fuzz testing across critical modules.

February 2025

40 Commits • 4 Features

Feb 1, 2025

February 2025 monthly summary for OSS fuzz projects. Delivered multi-language expansion and JVM harness enhancements, introduced Rust-based harness generation in OFG, integrated GPT-based code generation in the chat_llm workflow, and added configurable agent rounds to tailor experimentation. Also stabilized builds and improved robustness across CI, resulting in lower failure rates and faster iteration cycles. The work strengthens cross-language fuzzing coverage, accelerates harness generation through automation, and improves operational reliability in FI environments.

January 2025

3 Commits • 1 Features

Jan 1, 2025

January 2025 summary: Delivered automated fuzzing coverage for Rust crates unsafe-libyaml and ttf-parser via OSS-Fuzz integration, including Dockerfiles, build scripts, fuzzing targets, and reuse of upstream fuzzers to enable continuous security testing and improved robustness. Fixed a libc dependency build failure in starnix-netlink by correcting Cargo.toml declarations and dependency paths, restoring reliable builds. This work expands security testing coverage, accelerates feedback loops, and improves maintainability of fuzzing infrastructure. Technologies demonstrated include Rust, OSS-Fuzz, Docker, Cargo, fuzzing targets, and containerized CI-ready workflows.

December 2024

9 Commits • 3 Features

Dec 1, 2024

December 2024 highlights: delivered significant JVM-focused enhancements across two OSS-Fuzz repositories, strengthening test harness quality, fuzzing reliability, and artifact handling while delivering clearer coverage signals and safer operations. These improvements reduce debugging cycles, increase confidence in fuzzing results, and enable faster iteration with higher-quality code generation and instrumentation.

November 2024

6 Commits • 5 Features

Nov 1, 2024

November 2024 focused on expanding fuzzing coverage and test-generation capabilities across google/oss-fuzz and google/oss-fuzz-gen. Key deliverables include fuzz tooling for unicode-normalization, OSS-Fuzz integrations for tar-rs and utf8parse, fuzzing infrastructure for starnix-netlink, and JVM test harness prompt enhancements. No major bugs fixed were reported this month; the work emphasizes reducing risk by increasing fuzz coverage and improving automated test quality. These efforts improve security testing, code robustness, and developer productivity, with strong demonstrations of fuzzing, containerized build pipelines, and prompt engineering.

October 2024

4 Commits • 1 Features

Oct 1, 2024

Monthly summary for 2024-10 focusing on OSS-Fuzz integration work in google/oss-fuzz.

Activity

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Quality Metrics

Correctness89.4%
Maintainability87.2%
Architecture85.0%
Performance80.6%
AI Usage27.8%

Skills & Technologies

Programming Languages

BashCC++DockerfileGradleJavaMarkdownPythonRustShell

Technical Skills

AI IntegrationAPI IntegrationAgent DevelopmentAgent developmentAutomationBackend DevelopmentBug FixBug FixingBuild AutomationBuild ConfigurationBuild EngineeringBuild ScriptingBuild SystemBuild System AutomationBuild System Configuration

Repositories Contributed To

3 repos

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

google/oss-fuzz

Oct 2024 Mar 2026
14 Months active

Languages Used

DockerfileShellYAMLRustTOMLGradleJavaXML

Technical Skills

Build SystemsCI/CDContainerizationDevOpsFuzzingRust

google/oss-fuzz-gen

Nov 2024 Jun 2025
7 Months active

Languages Used

JavaPythonC++MarkdownRustYAMLBashShell

Technical Skills

Code AnalysisCode GenerationJava DevelopmentLLM IntegrationLLM Prompt EngineeringPrompt Engineering

FreeRADIUS/freeradius-server

Mar 2026 Mar 2026
1 Month active

Languages Used

C

Technical Skills

C programmingfuzz testingsecurity testing