EXCEEDS logo
Exceeds
Sam Willis

PROFILE

Sam Willis

Sam Willis engineered robust data synchronization, real-time querying, and developer tooling across the TanStack/db and electric-sql/pglite repositories. He delivered transactional multi-table sync APIs, advanced live query systems, and persistent storage layers, focusing on reliability and performance. Leveraging TypeScript and JavaScript, Sam refactored core data structures, optimized query planning, and introduced memory management improvements to support large-scale, collaborative applications. His work included enhancing API ergonomics, strengthening type safety, and automating dependency management, resulting in more predictable integration and onboarding. Sam’s contributions demonstrated deep backend and full stack expertise, consistently improving data correctness, developer experience, and system maintainability across complex codebases.

Overall Statistics

Feature vs Bugs

71%Features

Repository Contributions

150Total
Bugs
25
Commits
150
Features
60
Lines of code
173,842
Activity Months15

Work History

January 2026

3 Commits • 2 Features

Jan 1, 2026

January 2026 performance highlights: Implemented security-focused package publishing improvements across electric-sql/pglite, enhanced package management, documented AI-enabled CAD collaboration architecture in electric, and positioned the team for continued security and collaboration improvements.

December 2025

10 Commits • 2 Features

Dec 1, 2025

December 2025 monthly summary for TanStack/db focusing on performance, correctness, and business value. Key work centered on delivering deterministic multi-column query ordering with enhanced pagination, stabilizing live queries, and enabling flexible pagination strategies across cursor-based and offset-based modes. Also implemented on-demand sync optimizations, improved write operations with select handling, and automated dependency alignment for example projects to streamline releases.

November 2025

11 Commits • 3 Features

Nov 1, 2025

November 2025 performance summary: Delivered major feature and reliability improvements across TanStack/db and electric, with a strong emphasis on business value such as improved data consistency, faster live updates, and more robust progressive mode. Implemented query-driven synchronization enhancements, expanded predicate support, and deduplication improvements; advanced snapshot fetch and parsing improvements; stabilized scheduling, and maintained repo hygiene with cleanup commits. Demonstrated technical proficiency in advanced data synchronization, end-to-end testing, and performance-oriented refactors.

October 2025

15 Commits • 3 Features

Oct 1, 2025

October 2025 (TanStack/db): Delivered robust improvements to live queries, transaction synchronization, and query planning, along with stability fixes and routine maintenance. The work enhances data freshness, consistency, and developer productivity while reducing operational risk for users relying on real-time data and optimistic UI semantics.

September 2025

20 Commits • 6 Features

Sep 1, 2025

September 2025: Delivered cross-repo improvements across electric, TanStack/db, and pglite-sync that enhance data correctness, real-time capabilities, performance, and developer experience. The month focused on stabilizing live queries, tightening query correctness, refactoring for maintainability, and aligning dependencies with streaming capabilities.

August 2025

15 Commits • 7 Features

Aug 1, 2025

Monthly work summary for 2025-08 focused on stabilizing data lifecycle and DX in TanStack/db, delivering memory-management improvements, type-safety enhancements, and stronger live-query/sync reliability. The month produced measurable business value through reduced memory footprint, more predictable behavior in complex queries and joins, and improved developer experience with type inference and stable React integration.

July 2025

14 Commits • 6 Features

Jul 1, 2025

July 2025 performance summary: Delivered foundational storage, query, and indexing enhancements in TanStack/db, plus onboarding improvements in Electric, driving reliability, performance, and developer productivity. Notable outcomes include cross-tab persistent storage with LocalStorageCollection, an overhauled query system with composable queries and a new optimizer, indexing and autoIndex enabling faster lookups and live queries, and the launch of a differential dataflow engine package. A major bug fix improved transaction ordering integrity, and onboarding naming standardization streamlined project setup for new users.

June 2025

15 Commits • 7 Features

Jun 1, 2025

June 2025 monthly summary for electric-sql/pglite and TanStack/db. Delivered notable features, improved reliability, and enhanced developer experience through API ergonomics, performance, and documentation upgrades. Key outcomes include optional post-start subcommand support for PGlite, live query race-condition fixes, API and engine improvements, and comprehensive documentation for ORM usage and AI/agent workflows. The work reduces runtime risk, accelerates integration, and demonstrates strong capabilities across TypeScript, concurrency patterns, and documentation quality.

May 2025

15 Commits • 5 Features

May 1, 2025

May 2025 monthly summary for TanStack/db and electric-sql/pglite. Delivered real-time data subscriptions and UI reactivity, advanced optimistic/transactional data layer improvements, scalable large data handling, and expanded deployment capabilities. Also improved reliability and release hygiene across repositories.

April 2025

4 Commits • 1 Features

Apr 1, 2025

April 2025 focused on reliability, release readiness, and dependency hygiene for electric-sql/pglite. Delivered a concurrency-stability fix for live query unsubscription and completed essential release tooling work to streamline future deployments.

March 2025

3 Commits • 3 Features

Mar 1, 2025

March 2025 monthly summary focused on strengthening data integrity, API usability, and developer experience across three repositories. Key outcomes include: (1) cross-table transactional capabilities via a multi-shape sync API, (2) clearer, more actionable documentation for replica=full usage, and (3) improved preload usability by returning the actual collection object on preload. No major bug fixes were reported this month; the work emphasizes reliability, performance, and developer productivity.

February 2025

5 Commits • 3 Features

Feb 1, 2025

February 2025 monthly summary: Delivered core features and reliability improvements across the electric-sql/pglite and electric-sql/electric repos. Focused on compatibility with the Electric sync server, improved initial synchronization reliability by persisting offsets and robustly handling messages without direct offsets using LSN and operation position headers, refreshed dependencies for continued compatibility with the latest library releases, and introduced advanced streaming APIs to improve data management and reliability. Major bug fixes were applied to the pglite-sync integration to align with Electric server changes, reducing sync errors and improving stability.

January 2025

5 Commits • 2 Features

Jan 1, 2025

January 2025 monthly summary focusing on key accomplishments, including feature delivery, bug fixes, and overall impact across electric-sql/pglite and electric. Emphasis on business value, stability, and developer experience.

December 2024

6 Commits • 4 Features

Dec 1, 2024

December 2024 monthly summary: Delivered key API and example enhancements across two repositories, improving production reliability, integration clarity, and developer onboarding while expanding local-first capabilities.

November 2024

9 Commits • 6 Features

Nov 1, 2024

Month: 2024-11. Focused on increasing CI reliability, expanding data synchronization capabilities, broadening developer tooling, and improving platform compatibility for pglite. Delivered multiple features and fixes across electric-sql/pglite with concrete commit-level changes, enhancing reliability, performance, and developer experience.

Activity

Loading activity data...

Quality Metrics

Correctness94.0%
Maintainability89.8%
Architecture89.8%
Performance84.8%
AI Usage26.0%

Skills & Technologies

Programming Languages

CSSHTMLJSONJavaScriptMarkdownSQLShellTypeScriptYAMLyaml

Technical Skills

AI IntegrationAI integrationAPI DesignAPI DevelopmentAPI DocumentationAPI developmentAbstract Syntax Tree (AST) ManipulationAsync ProgrammingAsynchronous ProgrammingAutomated TestingBackend DevelopmentBrowser DevelopmentBrowser Storage APIBug FixingBuild Systems

Repositories Contributed To

3 repos

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

TanStack/db

Mar 2025 Dec 2025
9 Months active

Languages Used

TypeScriptJavaScriptMarkdownYAMLyamlJSON

Technical Skills

Async ProgrammingState ManagementTypeScriptAPI DesignAbstract Syntax Tree (AST) ManipulationBug Fixing

electric-sql/pglite

Nov 2024 Jan 2026
10 Months active

Languages Used

HTMLJavaScriptMarkdownSQLTypeScriptYAMLCSSJSON

Technical Skills

API DesignAPI DevelopmentBrowser DevelopmentBuild ToolsCI/CDData Import/Export

electric-sql/electric

Dec 2024 Jan 2026
8 Months active

Languages Used

CSSHTMLJavaScriptMarkdownSQLShellTypeScriptyaml

Technical Skills

CI/CDConfiguration ManagementDockerDocumentationElectricSQLFractional Indexing