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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 subdomain support for AgentAPI, extending Terraform-based infrastructure and module development to improve multi-tenant routing and deployment strategies. His work demonstrated depth in Go, TypeScript, and configuration management, with a focus on reliability, test coverage, and operational flexibility.

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