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Finn Ellis

PROFILE

Finn Ellis

Finn contributed to security and developer tooling across multiple Semgrep repositories, focusing on rule development, scripting, and documentation. In semgrep-rules, Finn enhanced stacktrace disclosure detection by expanding environment name checks, reducing production exposure risks through improved static code analysis in C# and YAML. For semgrep/mcp, Finn updated project documentation in Markdown to streamline user onboarding and clarify support resources, lowering support friction. In r2c-CSE/semgrep-utilities, Finn fixed endpoint URL construction in Python scripts and added comprehensive usage documentation, improving CI reliability and developer guidance. The work demonstrated depth in security analysis, scripting, and clear, maintainable documentation practices.

Overall Statistics

Feature vs Bugs

50%Features

Repository Contributions

4Total
Bugs
2
Commits
4
Features
2
Lines of code
51
Activity Months3

Work History

July 2025

2 Commits • 1 Features

Jul 1, 2025

July 2025 monthly summary for r2c-CSE/semgrep-utilities focused on reliability and developer enablement. Delivered targeted fixes to URL construction and expanded internal documentation, resulting in more stable deployments and clearer guidance for CI workflows.

June 2025

1 Commits • 1 Features

Jun 1, 2025

For June 2025, key focus was on improving user guidance in the semgrep/mcp repository through targeted documentation updates. The change enhances onboarding and reduces time to locate help resources, contributing to lower support friction and a more intuitive user experience.

April 2025

1 Commits

Apr 1, 2025

April 2025 monthly summary: Delivered a security rule hardening for stacktrace disclosure in semgrep-rules by expanding environment name checks to cover additional variants, improving rule accuracy and coverage. The change is tracked by commit 3ab4fe895825c12648760cd73ed64c08bbb011f4 (Add syntax variation for environment name check). This work fixes an edge-case where stack traces could be exposed and reduces exposure risk in production and CI environments. Technical achievements include enhancing rule logic in Semgrep, validating the change against existing rule patterns, and contributing to the semgrep-rules repository to strengthen security posture across deployments.

Activity

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Quality Metrics

Correctness95.0%
Maintainability95.0%
Architecture95.0%
Performance90.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

C#MarkdownPythonYAML

Technical Skills

DocumentationRule DevelopmentScriptingSecurity AnalysisStatic Code Analysis

Repositories Contributed To

3 repos

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

r2c-CSE/semgrep-utilities

Jul 2025 Jul 2025
1 Month active

Languages Used

Python

Technical Skills

DocumentationScripting

semgrep/semgrep-rules

Apr 2025 Apr 2025
1 Month active

Languages Used

C#YAML

Technical Skills

Rule DevelopmentSecurity AnalysisStatic Code Analysis

semgrep/mcp

Jun 2025 Jun 2025
1 Month active

Languages Used

Markdown

Technical Skills

Documentation

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