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Joel Jakobsson

PROFILE

Joel Jakobsson

Joel contributed to the PostgREST/postgrest and duckdb/pg_duckdb repositories, focusing on backend and API development using Haskell and SQL. He modernized the PostgREST API by enabling support for arrays of JSON objects in request bodies and removing deprecated headers, simplifying client integration and aligning with current RESTful practices. Joel also improved the OpenAPI specification to accurately reflect function volatility, ensuring only non-volatile functions are exposed via GET, which reduced client errors and clarified API contracts. Additionally, he enhanced documentation for duckdb/pg_duckdb by updating the README, improving onboarding and branding. His work demonstrated careful attention to contract correctness and maintainability.

Overall Statistics

Feature vs Bugs

67%Features

Repository Contributions

3Total
Bugs
1
Commits
3
Features
2
Lines of code
206
Activity Months3

Work History

July 2025

1 Commits

Jul 1, 2025

July 2025 — Focused on API contract correctness and stability improvements in PostgREST. Implemented a fix to align the OpenAPI specification with runtime function volatility, ensuring non-volatile (STABLE/IMMUTABLE) functions are exposed via GET while volatile functions remain restricted to POST. This reduces incorrect client usage, clarifies API expectations, and strengthens the contract between the API spec and server behavior. The change is tracked in a targeted fix commit, enhancing reliability for downstream clients and integrations.

November 2024

1 Commits • 1 Features

Nov 1, 2024

November 2024 monthly summary for PostgREST/postgrest: API modernization to accept an array of JSON objects for request bodies, removal of deprecated 'Prefer: params=single-object' header, and corresponding docs and type updates. This work reduces client complexity, improves consistency with modern API practices, and lays groundwork for batch-oriented features.

October 2024

1 Commits • 1 Features

Oct 1, 2024

October 2024: Delivered a targeted documentation enhancement for the duckdb/pg_duckdb project by adding a logo to the README, improving readability, branding, and onboarding for users and contributors. The change is isolated to documentation and does not affect core functionality. Commit 74bfe01bfce47bfcebd8ed3ab83454b05dca6596 ("Add logo to README (#357)") implemented the change. No major bugs were fixed this month; the focus was on quality of documentation and user experience.

Activity

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Quality Metrics

Correctness100.0%
Maintainability100.0%
Architecture100.0%
Performance100.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

HaskellMarkdownSQL

Technical Skills

API DevelopmentAPI DocumentationBackend DevelopmentDatabase IntegrationDeprecation ManagementDocumentationOpenAPI SpecificationRESTful Services

Repositories Contributed To

2 repos

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

PostgREST/postgrest

Nov 2024 Jul 2025
2 Months active

Languages Used

HaskellMarkdownSQL

Technical Skills

API DevelopmentBackend DevelopmentDatabase IntegrationDeprecation ManagementRESTful ServicesAPI Documentation

duckdb/pg_duckdb

Oct 2024 Oct 2024
1 Month active

Languages Used

Markdown

Technical Skills

Documentation

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