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Finn Ellis

PROFILE

Finn Ellis

Worked across multiple Semgrep repositories to enhance documentation, security rules, and developer tooling, focusing on clarity and reliability. Improved user guidance in semgrep/semgrep-docs by refining explanations of finding provenance, taint analysis, and Jira integration, using Markdown and technical writing to reduce onboarding friction and misconfiguration risks. Hardened stacktrace disclosure rules in semgrep/semgrep-rules by expanding environment name checks, leveraging C# and static code analysis to strengthen security coverage. In r2c-CSE/semgrep-utilities, addressed scripting reliability and documentation for CI workflows with Python and YAML. Demonstrated attention to detail, traceable commits, and cross-team collaboration, resulting in more maintainable and user-friendly projects.

Overall Statistics

Feature vs Bugs

56%Features

Repository Contributions

9Total
Bugs
4
Commits
9
Features
5
Lines of code
73
Activity Months7

Work History

February 2026

1 Commits

Feb 1, 2026

February 2026 (2026-02) monthly summary for semgrep/semgrep-docs: Key features delivered include a targeted documentation improvement for taint analysis sink handling, with removal of a duplicate explanation and updated guidance on how Semgrep treats arguments in the sink context (docs/writing-rules/data-flow/taint-mode/overview.md). Major bugs fixed involve eliminating the duplicate line about non-exact sinks to prevent confusion in sink behavior guidance. Overall impact: improved accuracy and maintainability of taint-analysis docs, enabling clearer rule authoring and reducing onboarding time; reinforced cross-team collaboration (Co-authored-by Abhijna Parigi). Technologies/skills demonstrated: markdown/docs maintenance, security-focused documentation, attention to detail, and cross-team collaboration.

November 2025

1 Commits

Nov 1, 2025

November 2025 monthly summary focusing on documentation accuracy improvements for Jira integration in semgrep/semgrep-docs. Delivered a targeted bug fix that corrects the Jira API endpoint documentation URL for creating tickets, improving developer onboarding and reducing support frictions. This change aligns with cross-team documentation standards and maintains stable docs release cadence.

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.

March 2025

1 Commits • 1 Features

Mar 1, 2025

March 2025: Semgrep docs contribution workflow clarified to streamline rule contributions and updates. Delivered targeted guidance: new rules via Semgrep AppSec Platform; updated rules and Registry contributions follow different workflows. Result: clearer onboarding, reduced contributor friction, and better alignment with platform strategy.

November 2024

2 Commits • 2 Features

Nov 1, 2024

November 2024 monthly summary for semgrep/semgrep-docs focusing on documentation enhancements that improve user understanding of finding provenance and recency, and alignment of UTC-related support windows.

Activity

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Quality Metrics

Correctness97.8%
Maintainability97.8%
Architecture97.8%
Performance95.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

C#MarkdownPythonYAML

Technical Skills

API integrationDocumentationRule DevelopmentScriptingSecurity AnalysisStatic Code Analysisdocumentationtechnical writing

Repositories Contributed To

4 repos

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

semgrep/semgrep-docs

Nov 2024 Feb 2026
4 Months active

Languages Used

Markdown

Technical Skills

DocumentationAPI integrationdocumentationtechnical writing

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