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Tomáš Fejfar

PROFILE

Tomáš Fejfar

Over six months, Tomas Fejfar enhanced core backend systems across repositories such as keboola/mcp-server and keboola/storage-api-php-client, focusing on API development, documentation, and infrastructure automation. He delivered robust error handling and structured JSON logging in Python, improved configuration update workflows, and automated AWS provisioning using Terraform. Tomas strengthened test reliability with PHPUnit and introduced validation tests to reduce regression risk in file filtering logic. His work emphasized code clarity, maintainability, and developer onboarding by refining API documentation and integrating CI/CD tooling. These contributions resulted in more reliable APIs, streamlined development environments, and improved operational transparency for both users and developers.

Overall Statistics

Feature vs Bugs

74%Features

Repository Contributions

38Total
Bugs
5
Commits
38
Features
14
Lines of code
6,176
Activity Months6

Work History

August 2025

9 Commits • 2 Features

Aug 1, 2025

August 2025 monthly summary for keboola/mcp-server focusing on delivering safer, more reliable configuration updates and enhanced CI/CD tooling. The month featured two major capabilities and several targeted fixes that together reduce risk and improve developer productivity.

July 2025

6 Commits • 4 Features

Jul 1, 2025

July 2025 monthly summary focusing on business value and technical achievements across Keboola repositories. Delivered automation for AWS provisioning to streamline dev/test environments, expanded API client capabilities, improved update operations, and standardized code quality tooling, resulting in faster onboarding, more reliable tests, and higher code quality.

June 2025

16 Commits • 4 Features

Jun 1, 2025

June 2025 monthly summary for keboola/mcp-server focused on delivering robust observability, formalized error handling, and improved HTTP error workflows to drive reliability and faster incident response.

May 2025

1 Commits • 1 Features

May 1, 2025

May 2025 (keboola/storage-api-php-client): Delivered targeted validation tests for file filtering in the Storage API PHP Client. Focused on improving reliability and reducing regression risk in filtering paths. Key outcomes include validating invalid values for the 'tags' filter, introducing a test for the 'isPublic' filter, and ensuring the new file-filtering code path is disabled to prevent unintended behavior. No production bugs fixed this month, but the new tests significantly strengthen the guardrails around filtering logic and pave the way for safer releases. Impact includes higher confidence in API behavior for clients and QA, and earlier detection of regressions in the filtering features. Technologies/skills demonstrated include PHP, PHPUnit-based testing, test-driven development, test data design, and code-path validation in a real client repository.

April 2025

5 Commits • 2 Features

Apr 1, 2025

April 2025 focused on delivering concrete improvements in documentation clarity, API behavior, test reliability, and container hygiene, driving better user onboarding for Snowflake integrations and stronger stability for storage API clients. The work emphasized business value through clearer configuration guidance, robust error handling, and leaner build artifacts.

October 2024

1 Commits • 1 Features

Oct 1, 2024

October 2024 monthly summary for keboola/storage-api-php-client. Focused on documenting and clarifying API behavior around configuration deletion across development and default branches. Delivered a precise, developer-friendly update to the API specs to reduce ambiguity and onboarding time.

Activity

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Quality Metrics

Correctness94.2%
Maintainability94.4%
Architecture91.2%
Performance86.8%
AI Usage31.0%

Skills & Technologies

Programming Languages

API BlueprintBashDockerfileHCLJSONJinjaMarkdownPHPPythonSQL

Technical Skills

API Client DevelopmentAPI DesignAPI DevelopmentAPI DocumentationAPI IntegrationAPI TestingAWSBackend DevelopmentBuild AutomationCI/CDCI/CD ConfigurationCloud InfrastructureCode ClarityCode FormattingCode Refactoring

Repositories Contributed To

4 repos

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

keboola/mcp-server

Jun 2025 Aug 2025
3 Months active

Languages Used

DockerfileMarkdownPythonSQLJinjaTOMLJSONYAML

Technical Skills

API Client DevelopmentAPI DesignAPI DevelopmentAPI IntegrationBackend DevelopmentCode Clarity

keboola/storage-api-php-client

Oct 2024 Jul 2025
4 Months active

Languages Used

API BlueprintDockerfilePHPapi description

Technical Skills

API DocumentationAPI IntegrationBackend DevelopmentDatabase TestingDevOpsDocker

keboola/connection-docs

Apr 2025 Apr 2025
1 Month active

Languages Used

Markdown

Technical Skills

Documentation

keboola/storage-backend

Jul 2025 Jul 2025
1 Month active

Languages Used

BashHCLMarkdown

Technical Skills

AWSCloud InfrastructureDevOpsShell ScriptingTerraform

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