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Hamza Jeljeli

PROFILE

Hamza Jeljeli

Hamza Jeljeli contributed to the input-output-hk/mithril and input-output-hk/ouroboros-leios repositories by building cryptographic proof systems and modernizing test infrastructure for blockchain applications. He developed end-to-end BLS-based voting demos with interactive UIs, integrating Python, Rust, and JavaScript to visualize voting flows and system environments. Hamza advanced SNARK and Halo2 circuit integration, refactored test architectures for determinism and maintainability, and improved error handling and documentation. His work included aligning Merkle path logic, optimizing test performance, and ensuring robust onboarding through clear documentation. These efforts enhanced reliability, maintainability, and production readiness of cryptographic and blockchain features across both projects.

Overall Statistics

Feature vs Bugs

87%Features

Repository Contributions

99Total
Bugs
4
Commits
99
Features
26
Lines of code
31,168
Activity Months4

Work History

March 2026

23 Commits • 5 Features

Mar 1, 2026

March 2026 monthly summary for input-output-hk/mithril: major test improvements, refactors, and integration work that boost reliability, reduce maintenance burden, and accelerate release readiness. Demonstrated deep expertise in SNARK/halo2 architecture, Rust testing, and cross-repo collaboration.

February 2026

41 Commits • 17 Features

Feb 1, 2026

February 2026 (repository: input-output-hk/mithril) delivered concrete business value through test modernization, SNARK/STM integration, and sustainable test infrastructure improvements. The efforts focused on determinism, readability, and faster feedback loops, while advancing the STM-enabled SNARK pipeline toward production readiness.

January 2026

18 Commits • 1 Features

Jan 1, 2026

In January 2026, the Mithril team delivered foundational Halo2 SNARK work behind a feature flag, integrated certificate circuit prototypes into Mithril STM, and established a comprehensive testing framework with extensive golden-certificates tests. The work includes refactoring of test utilities, CI/tooling improvements, and documentation updates, setting a solid foundation for future SNARK enhancements and reliable cryptographic proof validation.

October 2025

17 Commits • 3 Features

Oct 1, 2025

2025-10 monthly summary for dev work in input-output-hk/ouroboros-leios. The month focused on delivering an end-to-end BLS-based voting demo, UI enhancements, environment visibility, and onboarding improvements. Achievements span feature delivery, UI polish, and maintainability improvements, with clear business value in demo capabilities and deployment context.

Activity

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Quality Metrics

Correctness93.8%
Maintainability89.4%
Architecture91.6%
Performance89.6%
AI Usage24.4%

Skills & Technologies

Programming Languages

BashCSSHTMLJavaScriptMarkdownPythonRustShellTOMLbash

Technical Skills

Blockchain DevelopmentCSSCircuit DesignCode FormattingCode OrganizationCode RefactoringCode ReviewCryptographyData VisualizationDocumentationError HandlingFlaskHTMLJavaScriptJavaScript development

Repositories Contributed To

2 repos

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

input-output-hk/mithril

Jan 2026 Mar 2026
3 Months active

Languages Used

RustMarkdownTOML

Technical Skills

Code ReviewDocumentationRustRust programmingSoftware DevelopmentVersion Control

input-output-hk/ouroboros-leios

Oct 2025 Oct 2025
1 Month active

Languages Used

BashCSSHTMLJavaScriptMarkdownPythonRustShell

Technical Skills

CSSData VisualizationFlaskHTMLJavaScriptJavaScript development