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Ben Kettle

PROFILE

Ben Kettle

Over 21 months, contributed to semgrep/semgrep and semgrep-interfaces by building robust dependency resolution, scalable CLI tooling, and performance optimizations for large-scale code analysis. Delivered features such as partial scans for selective rule execution, dynamic dependency resolution, and enhanced error handling, using Python, OCaml, and TypeScript. Improved reliability through backward-compatible schema changes, lockfile parsing, and tracing instrumentation with OpenTelemetry. Enhanced developer experience by refining CLI outputs, supporting new package managers, and optimizing build systems. Focused on maintainability and observability, the work enabled faster incident response, reduced compute costs, and improved integration across diverse ecosystems, with thorough testing and documentation throughout.

Overall Statistics

Feature vs Bugs

83%Features

Repository Contributions

66Total
Bugs
8
Commits
66
Features
39
Lines of code
115,623
Activity Months21

Work History

June 2026

2 Commits • 2 Features

Jun 1, 2026

June 2026 monthly work summary focusing on key accomplishments and business impact across semgrep-interfaces and semgrep. Implemented partial scans feature enabling selective rule execution, enhancing incident response times and reducing unnecessary compute. Aligned with internal PRs (semgrep-proprietary#6311) and added tests for verification. No major bugs fixed this month; primary work targeted feature delivery and test coverage.

May 2026

4 Commits • 2 Features

May 1, 2026

May 2026 Monthly Summary for development work across semgrep/semgrep and semgrep/semgrep-docs. The month focused on improving accuracy of code-scanning and dependency analysis, reducing misclassifications, and documenting beta features to accelerate customer adoption.

April 2026

2 Commits • 2 Features

Apr 1, 2026

In April 2026, Semgrep/semgrep delivered performance and maintainability improvements focused on large repositories and OCaml 5 upgrade readiness. Key features include (1) OCaml 5 Compatibility Cleanup, removing an obsolete Semgrep rule now that OCaml 5 is in use, reducing rule overhead and simplifying maintenance; and (2) Gitignore Pattern Matching Performance Enhancement, introducing ripgrep-style indexing for Gitignore patterns with Literal, BasenameLiteral, Extension, and RequiredExtension strategies to accelerate file targeting. No explicit major bugs were fixed this month; the work centered on delivering scalable performance and cleaner code paths. Overall impact: significantly faster file targeting in large repos, lower resource usage, and easier maintainability, enabling more efficient analysis at scale and faster feedback to developers. Technologies/skills demonstrated: OCaml upgrades, ripgrep-inspired indexing, PCRE optimization, Gitignore filtering refactoring, performance benchmarking and testing, and careful rollout planning across a large codebase.

March 2026

11 Commits • 7 Features

Mar 1, 2026

March 2026 monthly summary: Delivered substantial improvements across Semgrep’s core product and interfaces, focusing on observability, reliability, and scalable tooling to drive faster issue diagnosis, more stable CI/builds, and stronger compliance tooling. Key features delivered include enhanced end-to-end tracing for Pro scans and RPC calls (OpenTelemetry) with a new tracing macro for function results, and RPC trace context propagation to OCaml interfaces. CLI and dependency analysis capabilities were expanded to dump identified subprojects and load precomputed dependencies, accelerating project analysis and CI workflows. Reliability improvements include a timeout-enabled command execution (UCmd) for lockfileless Gradle resolution to reduce flakiness, plus testing and snapshot stability improvements for Python dependencies. SBOM readiness was advanced with JSON subproject data types and an SBOM variant of subproject resolution, enabling structured data handling and better alignment with compliance tooling. Distributed scans were improved with config dump/restore support to resume scans from saved states. Technologies and skills demonstrated include OpenTelemetry tracing, tracing macros, RPC tracing, ATD-generated types with backward compatibility, Eio-based timeouts, SBOM data modeling, and improved Gradle resolution workflows.

February 2026

7 Commits • 4 Features

Feb 1, 2026

February 2026 monthly summary for semgrep-related work highlighting business value and technical accomplishments across two repositories. Key observability, build flexibility, and performance improvements implemented to accelerate dependency resolution, enhance debugging, and simplify build-time configurations for customers and internal teams.

January 2026

7 Commits • 3 Features

Jan 1, 2026

January 2026 performance-focused sprint for semgrep/semgrep: delivered three key performance/features for SCA scanning, fixed critical memory bottlenecks, and added tracing instrumentation across multi-language components, enabling faster scans and better observability. Key outcomes include substantial reductions in compute time and memory usage for large repos, improved business value through faster feedback and scalable scans, and the foundation for ongoing performance optimization.

December 2025

3 Commits • 1 Features

Dec 1, 2025

December 2025 monthly summary for semgrep/semgrep: Delivered critical UX improvements for dependency resolution and expanded Gradle lockfile naming support, enhancing reliability across Maven and Gradle workflows and delivering measurable business value.

November 2025

4 Commits • 3 Features

Nov 1, 2025

November 2025 monthly summary focusing on business value and technical achievements across Semgrep repos. Delivered tangible Scala/SBT enhancements, hardened build error handling, and improved operator visibility to reduce triage time. Maintained CLI backward compatibility while expanding support for modern dependency resolution workflows.

October 2025

4 Commits

Oct 1, 2025

Monthly summary for 2025-10 focusing on robust dependency resolution and UV lockfile parsing enhancements in semgrep/semgrep. Implemented targeted fixes to improve resolution reliability, visibility into subproject status, and parser resilience across Kotlin (build.gradle.kts), OCaml, and Python ecosystems. These changes deliver clearer scan results, faster triage, and reduced false negatives.

September 2025

2 Commits • 1 Features

Sep 1, 2025

September 2025 monthly summary focused on delivering a flexible dependency resolution improvement and ensuring accurate developer guidance across interfaces and docs. Key outcomes include enabling dynamic resolution with a new allow_local_builds flag and removing unsupported Podfile references from Swift SCA docs, reinforcing backward compatibility and reducing build-time errors.

August 2025

1 Commits

Aug 1, 2025

Concise monthly summary for 2025-08 focusing on reliability and correctness in Go tooling within semgrep/semgrep. No new features delivered this month; primary work concentrated on fixing a Go module parser issue and expanding test coverage to improve static analysis for Go projects. The changes enhance analysis accuracy for tool directives and Go module dependencies, reducing misconfigurations and improving developer confidence.

July 2025

2 Commits • 1 Features

Jul 1, 2025

July 2025 monthly summary for semgrep/semgrep focusing on performance improvements and diagnostics around Transitive Reachability (TR).

June 2025

3 Commits • 3 Features

Jun 1, 2025

June 2025 Performance Summary for semgrep-interfaces: Focused delivery on integration readiness, CLI visibility, and feature flag enablement to enhance developer experience and reduce operational friction. Delivered three customer-facing enhancements with careful attention to backward compatibility and clear scope boundaries.

May 2025

1 Commits • 1 Features

May 1, 2025

Concise monthly summary for 2025-05 focusing on key accomplishments for semgrep/semgrep-docs.

April 2025

1 Commits • 1 Features

Apr 1, 2025

Monthly summary for 2025-04 focusing on the semgrep-interfaces repository. Delivered a feature to support multiple source paths for downloaded dependencies, enabling package managers like pip that unpack dependencies into several directories. This preserves backward compatibility with older CLI versions and maintains compatibility with uv. The work reduces integration friction for downstream tooling and improves reliability of dependency resolution.

March 2025

2 Commits • 1 Features

Mar 1, 2025

March 2025 highlights for semgrep-interfaces: Delivered a major enhancement to dependency resolution and subproject matching, introducing an RPC-based cross-language flow and improved dependency source handling. The work strengthens modularity between Python and OCaml components and sets the stage for more scalable multi-language collaboration.

February 2025

3 Commits • 1 Features

Feb 1, 2025

February 2025 monthly summary for semgrep/semgrep-interfaces: Delivered major dependency graph enhancements and TR RPC interface improvements to improve dependency visibility, state tracking, and CLI workflows. Resulting changes enable precise transitive dependency filtering, better backward compatibility, and stronger business value through more reliable dependency management in Semgrep's interfaces ecosystem.

January 2025

1 Commits • 1 Features

Jan 1, 2025

January 2025 performance summary for semgrep-interfaces: Delivered enhanced diff-scan dependency visibility by introducing a full subproject dependency resolution flag and supporting updates to AST and JSON layers. This work improves accuracy of dependency graphs across branches and accelerates risk assessment for releases. No major bug fixes were logged this month for this repository.

December 2024

2 Commits • 1 Features

Dec 1, 2024

December 2024 monthly summary focusing on security clarity improvements and lockfileless mode reliability. Key efforts included feature rename to improve security semantics and a bug fix that corrects lockfile_path resolution in lockfileless mode with corresponding test updates.

November 2024

2 Commits • 2 Features

Nov 1, 2024

Month 2024-11: Focused on delivering robustness and determinism in semgrep-interfaces. Implemented two core features: Data Model Enhancement (Frozen and Hashable Fpath and Manifest dataclasses) and Dependency Resolution Enhancement (Lockfile support in RPC interface). These changes enable using Fpath/Manifest in sets/dicts, support deterministic builds via lockfiles, and provide new types for lockfiles and dependency sources with improved error reporting. Updated generated Python code and .atd to match the new models, ensuring downstream compatibility. No major bugs fixed this period; minor stability and correctness improvements observed in the RPC layer. Technologies demonstrated include Python dataclasses immutability, hashing, ATD generation, RPC interface evolution, and lockfile parsing.

October 2024

2 Commits • 2 Features

Oct 1, 2024

2024-10 Monthly Summary: Focused on reliability, maintainability, and backward compatibility in the semgrep-interfaces repo. Delivered error-handling improvements for dependency resolution and enhanced type definitions for manifest kinds, with JSON serialization support. These changes reduce CLI failures, improve diagnostics, and set a solid foundation for future resilience and observability across the project.

Activity

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Quality Metrics

Correctness93.8%
Maintainability87.4%
Architecture88.6%
Performance84.8%
AI Usage29.8%

Skills & Technologies

Programming Languages

ATDGoJSONJSON SchemaJavaScriptMarkdownN/AOCamlProtoBufProtobuf

Technical Skills

API DesignAPI designAPI developmentBackend DevelopmentBackward CompatibilityBuild SystemsCI/CDCLI DevelopmentCLI ToolsCLI developmentCode DocumentationCode GenerationCode RefactoringConfiguration ManagementConfiguration management

Repositories Contributed To

3 repos

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

semgrep/semgrep

Dec 2024 Jun 2026
12 Months active

Languages Used

OCamlPythonYAMLGoN/A

Technical Skills

CI/CDCLI developmentConfiguration managementRefactoringTestingCode Refactoring

semgrep/semgrep-interfaces

Oct 2024 Jun 2026
12 Months active

Languages Used

JSON SchemaOCamlProtocol BuffersPythonTypeScriptATDJSONJavaScript

Technical Skills

Backward CompatibilityCode DocumentationCode GenerationError HandlingProtocol BuffersSchema Definition

semgrep/semgrep-docs

May 2025 May 2026
3 Months active

Languages Used

Markdown

Technical Skills

DocumentationDevOpsdocumentationtechnical writing