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Jiri Semmler

PROFILE

Jiri Semmler

Over 16 months, contributed to core data platform engineering across the keboola/storage-api-php-client and keboola/storage-backend repositories, focusing on robust API development, backend reliability, and documentation clarity. Delivered features such as workspace credentials management, batch delete workflows, and CTAS-based Snowflake imports, while enhancing test coverage and CI/CD stability. Used PHP, SQL, and YAML to implement and document RESTful APIs, improve authentication, and support BigQuery and Snowflake integrations. Addressed code quality through static analysis and error handling improvements, and maintained comprehensive technical documentation. The work emphasized maintainable architecture, secure data operations, and streamlined onboarding for developers and platform users.

Overall Statistics

Feature vs Bugs

78%Features

Repository Contributions

129Total
Bugs
10
Commits
129
Features
35
Lines of code
9,232
Activity Months16

Work History

April 2026

4 Commits • 1 Features

Apr 1, 2026

April 2026 focused on targeted API documentation improvements for the keboola/storage-api-php-client, delivering a precise and developer-friendly batch-delete workflow for workspace objects. Work included aligning docs with branch-specific behavior (DMD-904), fixing parameter structure and error semantics in Apiary notes, and removing references to non-branch batch-delete to prevent confusion. The updates enhance developer onboarding and adoption of the batch-delete endpoint with correct guidance and expectations.

March 2026

11 Commits • 6 Features

Mar 1, 2026

March 2026 monthly highlights: Delivered core feature set for external bucket access and sharing in the storage backend, enhanced bucket management tooling and testing, extended the PHP client with gzip export support and batch delete workflow refactor with comprehensive E2E tests, and improved developer documentation. Increased governance, reliability, and performance visibility across storage workflows, with strong emphasis on business value and maintainable architecture.

February 2026

5 Commits • 2 Features

Feb 1, 2026

February 2026 monthly summary focusing on key accomplishments, features delivered, major bugs fixed, and business impact across keboola/storage-api-php-client, keboola/connection-docs, and keboola/storage-backend. Highlights include corrected API documentation typos with backward compatibility, documentation improvements for API integration steps (GCS and BigQuery) with clear references and naming conventions, and Analytics Hub integration enhancements for external BigQuery bucket linking and access control.

November 2025

2 Commits • 1 Features

Nov 1, 2025

November 2025 — Delivered Workspace Table Management API enhancements for keboola/storage-api-php-client, introducing new API definitions and options for primary keys and column definitions; clarified primary key semantics for table loading from Storage (nullability and inheritance) in the docs. Implemented API specs using Apiary to facilitate collaboration and review. No major bugs fixed this month; focus was on feature delivery and documentation improvements, strengthening workspace table workflows and reducing onboarding time for PHP client users.

October 2025

3 Commits • 1 Features

Oct 1, 2025

October 2025: Key feature delivered isBYODB indicator in the keboola/storage-api-php-client API responses, providing an isBYODB field to indicate whether a token is associated with a BYOD configuration. This aligns API surface with documentation and improves clarity for clients. Major bug fixes include suppressing PHPStan/static analysis warnings related to exception handling in Google Cloud Storage download paths and updating the suppression to reflect the intended behavior. Commits contributing to these outcomes: add byodb to response (71bbce13a5aa27d9b746a9069ea492bc140066a9); Fix stan (f2c880dbc182cc501841d961362ff5b65b3dcbee); fix stan (d78f0ff28ca6666d28c67e33fd9980a8a90cfbc1). Overall impact: clearer API contracts for clients, reduced static analysis noise, and improved maintainability across the storage-api-php-client repository. Technologies/skills demonstrated: PHP, API design, static analysis (PHPStan), exception handling discipline, Google Cloud Storage integration, and targeted code-quality improvements.

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

Correctness91.8%
Maintainability90.8%
Architecture87.6%
Performance86.6%
AI Usage21.4%

Skills & Technologies

Programming Languages

API BlueprintAPI Definition LanguageAPI DocumentationAPIBApiaryBashDockerfileDocumentationJSONMarkdown

Technical Skills

API DesignAPI DevelopmentAPI DocumentationAPI IntegrationAPI TestingAPI designAPI developmentAPI integrationBackend DevelopmentBigQueryBuild AutomationCI/CDCloud DeploymentCode QualityCode Refactoring

Repositories Contributed To

3 repos

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

keboola/storage-api-php-client

Oct 2024 Apr 2026
15 Months active

Languages Used

API BlueprintPHPDocumentationAPI Documentationapi description languageDockerfileYAMLApiary

Technical Skills

API DocumentationBackend DevelopmentPHPPHPUnitTestingAPI Integration

keboola/storage-backend

Nov 2024 Mar 2026
9 Months active

Languages Used

PHPBashYAMLDockerfileSQLMarkdownprotobuf

Technical Skills

Backend DevelopmentBigQueryCode RefactoringData TypesDatabaseDatabase Management

keboola/connection-docs

Oct 2024 Mar 2026
3 Months active

Languages Used

Markdown

Technical Skills

DocumentationAPI integrationBigQuerycloud storagedocumentationtechnical writing