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Cian Johnston

PROFILE

Cian Johnston

Cian Johnston enhanced deployment flexibility and configuration integrity across multiple repositories, including coder/vscode-coder, coder/agentapi, and coder/registry. He implemented robust SSH configuration validation and atomic file saving in Node.js to reduce data loss and misconfiguration risks. In coder/agentapi, he enabled subpath deployment by refining URL handling and backend logic, supporting smoother integration with reverse proxies. For coder/registry, Cian delivered configurable AgentAPI subdomain support using Go and Terraform, extending module development and infrastructure as code practices. His work demonstrated depth in configuration management, error handling, and testing, resulting in more reliable, adaptable, and maintainable deployment workflows for complex environments.

Overall Statistics

Feature vs Bugs

67%Features

Repository Contributions

4Total
Bugs
1
Commits
4
Features
2
Lines of code
810
Activity Months3

Work History

August 2025

2 Commits • 1 Features

Aug 1, 2025

August 2025 monthly work summary for coder/registry: Delivered configurable AgentAPI subdomain support and related tests, updated compatibility version, and ensured propagation of subdomain settings across modules. No major bugs fixed this period; focused on stability, configurability, and testing coverage. Business value includes improved multi-tenant routing, easier deployment, and reduced risk of misrouting across subdomains.

July 2025

1 Commits • 1 Features

Jul 1, 2025

July 2025 focused on enabling subpath deployment for the Agent API to improve deployment flexibility and integration options. Delivered changes to run coder/agentapi under a subpath by correctly configuring base path and URL construction, laying groundwork for smoother hosting with reverse proxies and multi-tenant deployments.

May 2025

1 Commits

May 1, 2025

Monthly summary for May 2025: Focused on strengthening SSH config integrity and safe file saving in coder/vscode-coder. Delivered robust validation to detect malformed SSH config files and enforce correct start/end blocks, added explicit errors to prevent misconfigurations, and implemented atomic saves that preserve original file permissions by writing to a temporary file before atomic replacement. These changes reduce data loss risk, improve reliability of SSH-based workflows, and enhance user trust in development environments.

Activity

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Quality Metrics

Correctness95.0%
Maintainability90.0%
Architecture90.0%
Performance85.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

GoHCLJavaScriptMakefileShellTerraformTypeScript

Technical Skills

API IntegrationBackend DevelopmentConfiguration ManagementError HandlingFile System OperationsFrontend DevelopmentInfrastructure as CodeModule DevelopmentNode.jsTerraformTestingURL HandlingUnit Testing

Repositories Contributed To

3 repos

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

coder/registry

Aug 2025 Aug 2025
1 Month active

Languages Used

HCLJavaScriptShellTerraformTypeScript

Technical Skills

API IntegrationConfiguration ManagementInfrastructure as CodeModule DevelopmentTerraformTesting

coder/vscode-coder

May 2025 May 2025
1 Month active

Languages Used

JavaScriptTypeScript

Technical Skills

Configuration ManagementError HandlingFile System OperationsNode.jsUnit Testing

coder/agentapi

Jul 2025 Jul 2025
1 Month active

Languages Used

GoMakefileTypeScript

Technical Skills

Backend DevelopmentConfiguration ManagementFrontend DevelopmentURL Handling

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