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Marc Greenstock

PROFILE

Marc Greenstock

Over six months, contributed to the vercel/vercel and vercel/terraform-provider-vercel repositories by building and enhancing backend systems for authentication, access control, and team management. Developed features such as OIDC token caching, custom audience token exchange, and CLI-based token retrieval, using Go, TypeScript, and Terraform. Improved security and operational efficiency by implementing in-memory caching with expiry, deprecating legacy APIs, and introducing validation for configuration changes. Integrated AWS and OIDC authentication, automated access group management, and streamlined developer workflows. Addressed authentication reliability by refining token precedence logic and reducing redundant API calls, supporting scalable, maintainable infrastructure and robust automation for cloud environments.

Overall Statistics

Feature vs Bugs

88%Features

Repository Contributions

8Total
Bugs
1
Commits
8
Features
7
Lines of code
3,338
Activity Months6

Work History

July 2026

1 Commits • 1 Features

Jul 1, 2026

July 2026 monthly summary for vercel/vercel: Delivered a foundational OIDC token caching enhancement that reduces external token exchanges, improves authentication latency, and enables safer, bounded in-memory storage. Implemented skipCache pathway to bypass the cache when needed. Introduced expiry-based eviction with a bounded cache size (LRU, max 1000) and token-audience-jti based keys to support token rotation without unbounded memory growth. Integrated caching across exchangeVercelOidcToken, getVercelOidcToken, and awsCredentialsProvider, cutting redundant calls to oidc.vercel.com and lowering operational cost. Added comprehensive unit tests for cache hits/expiry/bypass, key construction, and size-based eviction, plus type-level validations to enforce correct option usage. This work aligns with vercel/front#75037 for expiry data and strengthens auth reliability and performance.

June 2026

2 Commits • 2 Features

Jun 1, 2026

June 2026 monthly summary for vercel/vercel focusing on OIDC token management improvements and API modernization. Delivered two key enhancements that strengthen security, cloud integration, and token reliability, with explicit guidance for safer usage and targeted testing across affected packages.

February 2026

1 Commits • 1 Features

Feb 1, 2026

February 2026 monthly summary for vercel/vercel: Added a new development OIDC token retrieval command to the CLI, enabling developers to fetch a development OIDC token for a project directly from the CLI. This improves developer workflow, supports automation, and enhances on-call and CI/CD token handling.

June 2025

2 Commits • 2 Features

Jun 1, 2025

June 2025 performance summary for vercel/terraform-provider-vercel: Delivered feature improvements including deprecation validator for OIDC token config and new DSync groups data source for Vercel Teams. No major bug fixes this month. These changes improve configuration clarity, stability, and automation capabilities for team management, aligning with product goals and security posture.

May 2025

1 Commits

May 1, 2025

May 2025 Monthly Summary for vercel/vercel: Delivered a critical OIDC token loading precedence fix to improve authentication reliability and security across requests. The change prioritizes the x-vercel-oidc-token header over the VERCEL_OIDC_TOKEN environment variable to ensure the most immediate token source is used, preventing token overwrites. This reduces token misconfiguration risk and strengthens access control in production.

November 2024

1 Commits • 1 Features

Nov 1, 2024

Monthly work summary for 2024-11 focusing on delivering Vercel Access Groups management features within the vercel/terraform-provider-vercel repository, including new resources and data sources and the initial commit enabling CRUD operations and project assignments for access groups.

Activity

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Quality Metrics

Correctness97.6%
Maintainability90.0%
Architecture92.6%
Performance85.0%
AI Usage27.6%

Skills & Technologies

Programming Languages

GoHCLJavaScriptMarkdownTypeScript

Technical Skills

API DevelopmentAPI IntegrationAPI developmentAPI integrationAWS integrationBackend DevelopmentCLI DevelopmentData ModelingDocumentationError HandlingGoGo ProgrammingInfrastructure as CodeNode.jsOIDC authentication

Repositories Contributed To

2 repos

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

vercel/vercel

May 2025 Jul 2026
4 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

API DevelopmentBackend DevelopmentNode.jsAPI IntegrationCLI DevelopmentError Handling

vercel/terraform-provider-vercel

Nov 2024 Jun 2025
2 Months active

Languages Used

GoMarkdownHCL

Technical Skills

API IntegrationGo ProgrammingInfrastructure as CodeTerraform Provider DevelopmentData ModelingDocumentation