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Herman Slatman

PROFILE

Herman Slatman

Herman Slatman contributed to the smallstep/certificates and smallstep/cli repositories, focusing on backend development, security, and tooling reliability. Over twelve months, he delivered features and fixes that improved certificate management, device attestation, and release automation. Using Go, Bash, and YAML, Herman upgraded dependencies, refactored code for maintainability, and enhanced test coverage to ensure cross-platform stability. He addressed cryptographic protocol updates, streamlined CI/CD workflows, and implemented robust error handling. His work included strengthening OIDC JWT validation, modernizing SSH and Windows integration, and introducing safer type conversions, resulting in more secure, maintainable, and production-ready infrastructure for authentication and provisioning.

Overall Statistics

Feature vs Bugs

68%Features

Repository Contributions

78Total
Bugs
13
Commits
78
Features
28
Lines of code
8,264
Activity Months12

Work History

February 2026

2 Commits

Feb 1, 2026

February 2026 monthly summary for smallstep/cli focused on stability and security improvements. Delivered two targeted fixes with testing to reduce risk from external changes and strengthen security posture:

November 2025

3 Commits • 1 Features

Nov 1, 2025

Summary for 2025-11: Focused on reliability and maintainability for smallstep/cli with targeted codebase cleanup and dependency upgrades. Implemented removal of deprecated build tags for cleaner builds, refactored integer conversions to use the go-safecast Convert function for safer type handling and reduced duplication, and upgraded go-safecast from v1.8.2 to v2.0.0 to access new features and fixes. These changes reduce build risk, improve safety, and simplify long-term maintenance, aligning with the goal of delivering stable, production-ready tooling.

October 2025

2 Commits • 1 Features

Oct 1, 2025

Month: 2025-10 | Focus on improving reliability and consistency in the smallstep/certificates repo. Delivered a reproducible dependency version for SCEP and consolidated backdate handling for ACME provisioners, with changes reflected in module files and broader provisioning behavior.

September 2025

8 Commits • 3 Features

Sep 1, 2025

September 2025: Delivered targeted feature and reliability improvements across the certificates and CLI repositories, focusing on security, build reliability, and developer productivity. Key outcomes include a strengthened device attestation path, more robust release tooling, and stabilized tests for Go-version compatibility, enabling faster, safer releases and reduced maintenance overhead.

August 2025

1 Commits

Aug 1, 2025

Monthly summary for 2025-08 focusing on smallstep/certificates: Delivered a critical bug fix to OIDC JWT signature verification by updating the signature algorithm in challenge_wire_test.go from ES256 to RS256, aligning test expectations with the actual JWT algorithm and resolving a failing test. This change strengthens token validation fidelity and JWT compliance in OIDC flows, reducing risk in authentication and improving overall security posture. The work also contributed to more stable tests, clearer alignment with JWT specs, and demonstrated continued commitment to quality and security in the certificates repository.

June 2025

9 Commits • 3 Features

Jun 1, 2025

June 2025: Delivered cross-repo improvements across smallstep/cli and smallstep/certificates, focusing on Windows SSH configuration robustness, DSA key handling clarity, compile-time branding flexibility, and modernized crypto test infrastructure. These changes improve reliability, tooling compatibility, branding agility, and test maintainability, driving business value through reduced support friction and faster developer iteration.

May 2025

10 Commits • 5 Features

May 1, 2025

May 2025 monthly summary: Delivered key features and stability improvements across smallstep/certificates and smallstep/cli, focusing on business value, maintainability, and cross-platform reliability. Highlights include lint/compliance improvements, dependency upgrades, enhanced CLI test infrastructure, Windows SSH agent reliability, and CI-ready non-interactive keypair testing.

April 2025

15 Commits • 4 Features

Apr 1, 2025

April 2025 monthly summary focusing on delivering business value through hardened release tooling, more reliable builds, and improved stability for client interactions. Notable work includes Goreleaser release tooling improvements with local build support and git metadata embedding; fixes for AMD64 HOSTARCH URL mapping; documentation enhancements to improve onboarding; simplification of module tooling by removing explicit Go toolchain configuration; and timeout hardening for certificate clients to improve reliability.

March 2025

10 Commits • 3 Features

Mar 1, 2025

March 2025: Delivered security- and stability-focused updates across smallstep/cli and smallstep/certificates. Key features delivered include a crypto dependency upgrade and Go toolchain updates; major bug fixes improved docs and provisioning workflow; results include stronger security posture, improved policy reliability, and reduced maintenance overhead. Technologies demonstrated include Go modules, dependency and toolchain management, CLI/policy design, SCEP detection, and secure-by-default tooling practices.

February 2025

8 Commits • 5 Features

Feb 1, 2025

February 2025 monthly summary focused on stability, reliability, and release quality across two repositories: smallstep/certificates and smallstep/cli. Key actions include Go toolchain upgrades for stability and security, introduction of a safer cast mechanism with cross-architecture test coverage, and hardening of CI/CD release workflows and formatting practices to improve maintainability and release confidence. The work reduces production risk, improves cross-platform correctness, and accelerates secure delivery of features.

January 2025

6 Commits • 2 Features

Jan 1, 2025

January 2025 monthly summary focused on dependency hygiene, test reliability, and release accuracy across smallstep/cli and smallstep/certificates. Key work centered on upgrading core libraries, stabilizing integration tests, and correcting release artifact references to reduce risk and accelerate safe deployments. The effort delivered concrete, verifiable changes with direct business value: compatibility with updated dependencies, more reliable CI, and a streamlined release process.

December 2024

4 Commits • 1 Features

Dec 1, 2024

December 2024 monthly summary: Strengthened security and reliability across two critical repos by delivering robust Nebula CA pool initialization with certificate validity enforcement and stabilizing the CLI build through targeted dependency upgrades. These changes reduce provisioning failures, improve test coverage, and enhance overall maintainability and deployment confidence. Key traceability: Nebula fixes implemented via commits 9000271ce0c6c21b0c06c412b7fe8f44a5480a63 and 4c7aa8a6233514ec1cce677c44619f66bda0c9d0; CLI upgrades implemented via commits 4de3f874f75bd1602876dbcad884aa39fb509627 and efba69c070202645001368c7b64e23d9a5754179.

Activity

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Quality Metrics

Correctness93.8%
Maintainability94.0%
Architecture91.0%
Performance88.8%
AI Usage20.6%

Skills & Technologies

Programming Languages

BashGoMakefileMarkdownShellYAML

Technical Skills

ACME ProtocolAPI Client ImplementationAPI IntegrationBackend DevelopmentBuild AutomationBuild ConfigurationBuild SystemCI/CDCLI DevelopmentCertificate AuthorityCertificate ManagementCode AnalysisCode FormattingCode MaintenanceCode Organization

Repositories Contributed To

2 repos

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

smallstep/cli

Dec 2024 Feb 2026
10 Months active

Languages Used

GoShellMakefileMarkdownYAMLBash

Technical Skills

Dependency ManagementGo ModulesCI/CDCode FormattingGoRefactoring

smallstep/certificates

Dec 2024 Oct 2025
10 Months active

Languages Used

GoYAMLMakefile

Technical Skills

Backend DevelopmentCertificate ManagementError HandlingGoTestingConfiguration Management