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Jiri Semmler

PROFILE

Jiri Semmler

Jirka Semmler developed and maintained core backend features for the keboola/storage-api-php-client and keboola/storage-backend repositories, focusing on robust API design, data integration, and test-driven development. He implemented credential management APIs, enhanced Snowflake and BigQuery data workflows, and improved CI/CD reliability using PHP, SQL, and Docker. Jirka’s work included refactoring authentication to support RSA keys, expanding test coverage for workspace operations, and streamlining build automation. By addressing security, data correctness, and code quality, he reduced operational risk and improved developer experience. His contributions demonstrated depth in backend engineering, with careful attention to documentation, integration testing, and long-term maintainability.

Overall Statistics

Feature vs Bugs

75%Features

Repository Contributions

104Total
Bugs
8
Commits
104
Features
24
Lines of code
8,232
Activity Months11

Work History

August 2025

9 Commits • 1 Features

Aug 1, 2025

August 2025: Delivered the Workspace Credentials API for keboola/storage-api-php-client with full CRUD endpoints for workspace credentials, enhanced event tracking for credential operations, expanded test coverage including read-only access and event reliability, and comprehensive documentation updates with Apiary integration. The test suite was stabilized and code style issues addressed to improve reliability and maintainability. This work strengthens credential governance, observability, and developer experience, delivering auditable credential management and reduced operational risk, with clear traceability to a set of commits that advanced tests, docs, and style compatibility.

July 2025

8 Commits • 2 Features

Jul 1, 2025

July 2025 monthly summary for keboola/storage-api-php-client focused on test-driven feature delivery and quality assurance improvements. Delivered two key testing features: Read-Only Workspace Access Tests and Snowflake Dynamic Backend Data Import Testing. These efforts strengthen security controls, data access validation, and data import reliability, aligning QA activities with business risk management and deployment readiness.

June 2025

18 Commits • 5 Features

Jun 1, 2025

June 2025 performance highlights: Delivered customer-facing API enhancements, improved data tooling reliability across BigQuery and Snowflake, and strengthened security/authentication in Snowflake backend. Focused on business value by enabling explicit activation states, robust data testing pipelines for BigQuery and Snowflake, and RSA-based Snowflake authentication, complemented by autoload/test environment fixes and updated docs.

May 2025

2 Commits • 2 Features

May 1, 2025

In May 2025, delivered major backend enhancements and testing improvements across two Keboola repositories. Implemented CTAS-based loading for Snowflake backend imports, enabling more efficient full-table data loads with new SQL generation, validation of table definitions, and updated importer logic. Added comprehensive Workspace Copy and Clone Validation Tests for the PHP client to verify data loading into reader accounts and cloning into workspaces, alongside test setup refactors to improve reliability.

April 2025

10 Commits • 3 Features

Apr 1, 2025

April 2025: Delivered cross-repo improvements across keboola/storage-backend and keboola/storage-api-php-client that strengthen CI/CD stability, PHP runtime support, security, and test coverage for Snowflake BYODB workflows. These changes reduce deployment risk, improve maintainability, and expand data integration capabilities for production workloads.

March 2025

6 Commits • 2 Features

Mar 1, 2025

March 2025 (2025-03) monthly summary for keboola/storage-api-php-client: Delivered key reliability and clarity improvements across SSO workflow, API usage, and test coverage. Snowflake SSO Password Reset Guard fix reduces risk of unintended resets for SSO-based workspaces, API cleanup removes deprecated valuesByTableInStorage and aligns docs with the available valuesByTableInWorkspace, and test infrastructure enhancements extend cross-backend coverage to BigQuery. These changes collectively improve security, developer experience, and release confidence.

February 2025

7 Commits • 3 Features

Feb 1, 2025

February 2025 monthly summary focusing on platform cleanup to simplify builds, reduce maintenance, and deprecate legacy drivers across Keboola storage products. Key outcomes include removal of Teradata/Exasol drivers, TWC tests deprecation, and CI/CD/Dockerfile cleanups, delivering faster builds and lower risk.

January 2025

13 Commits • 2 Features

Jan 1, 2025

January 2025 monthly summary for keboola/storage-backend and keboola/storage-api-php-client. This period delivered core features, major bug fixes, and notable improvements across CI, API, and test infrastructure, driving business value and long-term maintainability.

December 2024

1 Commits

Dec 1, 2024

December 2024 (keboola/storage-backend) focused on stability, correctness, and test coverage rather than feature expansion. The key change this month corrected the SQL UPDATE test logic to reflect proper string-type comparisons and inequality handling, preventing incorrect updates. No new user-facing features were released; the effort targeted reducing production incidents and improving data integrity across pipelines.

November 2024

24 Commits • 3 Features

Nov 1, 2024

November 2024: Delivered cross-repo reliability and governance enhancements for data pipelines. In keboola/storage-backend, unified SQL builder improvements for Snowflake and BigQuery, added native data type support for import/export, and expanded test coverage; in keboola/storage-api-php-client, implemented External Schema Sharing Validation, refined alias refresh handling, deprecated an API field for governance, and introduced a Network Policy Testing Helper to strengthen access-control validation. These changes reduce risk in data movement, improve cross-platform consistency, and demonstrate strong data engineering and testing capabilities.

October 2024

6 Commits • 1 Features

Oct 1, 2024

Concise monthly summary for 2024-10 focusing on business value and technical improvements across keboola/connection-docs and keboola/storage-api-php-client. The month delivered clearer data-type guidance, corrected API typing, and strengthened test reliability, enhancing developer experience and reducing runtime issues for Snowflake-related integrations.

Activity

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Quality Metrics

Correctness91.2%
Maintainability90.4%
Architecture86.0%
Performance85.4%
AI Usage20.6%

Skills & Technologies

Programming Languages

API BlueprintAPI Definition LanguageAPI DocumentationApiaryBashDockerfileDocumentationMarkdownPHPSQL

Technical Skills

API DesignAPI DevelopmentAPI DocumentationAPI IntegrationAPI TestingBackend DevelopmentBigQueryBuild AutomationCI/CDCloud DeploymentCode QualityCode RefactoringConfiguration ManagementContainerizationData Profiling

Repositories Contributed To

3 repos

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

keboola/storage-api-php-client

Oct 2024 Aug 2025
10 Months active

Languages Used

API BlueprintPHPDocumentationAPI Documentationapi description languageDockerfileYAMLApiary

Technical Skills

API DocumentationBackend DevelopmentPHPPHPUnitTestingAPI Integration

keboola/storage-backend

Nov 2024 Jun 2025
7 Months active

Languages Used

PHPBashYAMLDockerfileSQLMarkdown

Technical Skills

Backend DevelopmentBigQueryCode RefactoringData TypesDatabaseDatabase Management

keboola/connection-docs

Oct 2024 Oct 2024
1 Month active

Languages Used

Markdown

Technical Skills

Documentation

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