EXCEEDS logo
Exceeds
Jonatan Männchen

PROFILE

Jonatan Männchen

Jonatan contributed to core infrastructure and security across elixir-lang/elixir, gleam-lang/gleam, and oss-review-toolkit/ort, focusing on release automation, CI/CD hardening, and supply chain transparency. He implemented SBOM and SLSA provenance generation in Elixir and Gleam, automated license compliance checks, and modernized release pipelines using GitHub Actions and Azure for trusted signing. In ort, Jonatan refactored scanner logic for maintainability, improved license detection, and enhanced data merging with type-safe operators in Kotlin. His work addressed reliability, security, and auditability, integrating technologies like Elixir, Kotlin, and Docker, and demonstrated depth in backend development, DevOps, and secure software delivery.

Overall Statistics

Feature vs Bugs

83%Features

Repository Contributions

49Total
Bugs
5
Commits
49
Features
24
Lines of code
10,390
Activity Months7

Work History

September 2025

4 Commits • 2 Features

Sep 1, 2025

September 2025 monthly summary focused on delivering business value through security, reliability, and future-readiness across Elixir, Erlang, and Reactor ecosystems. The month emphasized hardening CI/CD pipelines, fixing correctness gaps, and laying groundwork for Spark integration.

July 2025

6 Commits • 2 Features

Jul 1, 2025

July 2025 monthly summary focusing on delivered features, fixes, and impact across two repositories (oss-review-toolkit/ort and elixir-lang/elixir).

June 2025

7 Commits • 4 Features

Jun 1, 2025

June 2025 performance summary: Across four repositories, delivered stability improvements, security enhancements for release processes, and data-quality gains with meaningful business impact. Key features and fixes were implemented with a focus on reliability, governance, and scalable architecture. Key achievements: - phoenixframework/phoenix: CI/CD stability and dependency governance (6d77d9d, 969d5cd, 113d2f0e) - Harden CI (#6280), update Node dependencies (#6283), and Setup Dependabot for NPM (#6284). - gleam-lang/gleam: Windows Trusted Signing for Release Builds (345ed682e7992817b015a775caa8defa42f5143f) - Integrates Azure code-signing services to sign binaries and updates release workflows. - oss-review-toolkit/ort: Deduplicate scan results and fix license comparisons (927e47c951e16dbdfbbd976d9db0a16e41c5ec45) - Merge duplicate scan results that share provenance to improve license accuracy. - oss-review-toolkit/ort: Add type-safe merge operators and enhanced merging for scan data (7c5958483191a3a1eac34cfbc6e5fe9067050520) - Introduce + merge operators for scan-domain objects with extensive unit tests. - elixir-lang/elixir: Secure Windows binary signing with Workload Identity Federation (1753c81f9eb0dc2b193571aa549c5a947d4e7fd4) - Switch Windows signing to WIF for stronger security posture and maintainability.

April 2025

7 Commits • 5 Features

Apr 1, 2025

April 2025 monthly summary: Delivered key features and process improvements across Elixir, Gleam, Erlang, and Docs repositories, including enhanced test coverage reporting, release automation, and additional platform support. Focused on business value: reliability, faster feedback loops, broader distribution, and clearer developer guidance.

March 2025

10 Commits • 4 Features

Mar 1, 2025

March 2025 monthly summary focusing on security, transparency, and CI reliability across Gleam, Elixir, and Phoenix. Implemented supply chain transparency with SBOM and build provenance; hardened CI to reduce release risk; updated security and contributor policies; refreshed documentation to reflect current best practices and resources. These efforts improve trust with users, enable easier compliance during releases, and reduce operational risk across the ecosystem.

February 2025

10 Commits • 4 Features

Feb 1, 2025

February 2025 monthly summary focusing on delivered features, impact, and technical achievements across two repositories. No high-severity bugs were reported this month; efforts concentrated on governance, compliance, and release process improvements that drive risk reduction and faster, auditable delivery.

December 2024

5 Commits • 3 Features

Dec 1, 2024

December 2024 monthly work summary focusing on security risk awareness, release integrity, and CI/CD improvements across Erlang, RabbitMQ, and Elixir ecosystems.

Activity

Loading activity data...

Quality Metrics

Correctness94.2%
Maintainability94.0%
Architecture91.0%
Performance85.8%
AI Usage20.0%

Skills & Technologies

Programming Languages

BashDockerfileElixirErlangJavaJavaScriptKotlinKotlin ScriptMakefileMarkdown

Technical Skills

AzureBackend DevelopmentBug FixingBuild AutomationBuild SystemBuild SystemsBuild ToolsCI/CDCloud SecurityCode FormattingCode OrganizationCode ReadabilityCode RefactoringCompiler DevelopmentConfiguration Management

Repositories Contributed To

9 repos

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

elixir-lang/elixir

Dec 2024 Sep 2025
7 Months active

Languages Used

BashPowerShellYAMLElixirErlangKotlin ScriptMakefileMarkdown

Technical Skills

CI/CDGitHub ActionsRelease ManagementScriptingBuild SystemBuild Tools

oss-review-toolkit/ort

Jun 2025 Jul 2025
2 Months active

Languages Used

JavaKotlinYAML

Technical Skills

Backend DevelopmentCode RefactoringData ModelingSoftware DesignTestingUnit Testing

gleam-lang/gleam

Feb 2025 Jun 2025
4 Months active

Languages Used

BashYAMLDockerfileShell

Technical Skills

CI/CDDockerGitHub ActionsShell ScriptingBuild SystemsContainerization

phoenixframework/phoenix

Mar 2025 Jun 2025
2 Months active

Languages Used

ElixirJavaScriptYAML

Technical Skills

DocumentationLink ManagementCI/CDDependency ManagementDevOpsESLint

erlang/erlang-org

Dec 2024 Apr 2025
2 Months active

Languages Used

MarkdownYAML

Technical Skills

Cybersecurity AwarenessTechnical WritingDocumentation Management

rabbitmq/rabbitmq-website

Dec 2024 Dec 2024
1 Month active

Languages Used

Markdown

Technical Skills

Security AwarenessTechnical Writing

github/docs

Apr 2025 Apr 2025
1 Month active

Languages Used

Markdown

Technical Skills

Documentation

erlang/otp

Sep 2025 Sep 2025
1 Month active

Languages Used

Erlang

Technical Skills

Compiler DevelopmentErlang DevelopmentTesting

ash-project/reactor

Sep 2025 Sep 2025
1 Month active

Languages Used

Elixir

Technical Skills

DSL DevelopmentElixir

Generated by Exceeds AIThis report is designed for sharing and indexing