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Leo Kewitz

PROFILE

Leo Kewitz

Leo developed and maintained core financial and governance features for the opencollective/opencollective-api and opencollective/opencollective-frontend repositories, focusing on robust multi-currency payment workflows, scalable platform billing, and secure account management. He engineered backend enhancements in Node.js and TypeScript, including Wise integration refactors for flexible cross-border payouts and persistent FX tracking, while modernizing GraphQL APIs for account and subscription management. On the frontend, Leo delivered React-based dashboards and onboarding flows, improving admin UX and data visibility. His work demonstrated depth in database optimization, error handling, and policy enforcement, resulting in reliable, maintainable systems that support complex financial operations at scale.

Overall Statistics

Feature vs Bugs

71%Features

Repository Contributions

259Total
Bugs
42
Commits
259
Features
102
Lines of code
98,065
Activity Months13

Work History

November 2025

3 Commits • 1 Features

Nov 1, 2025

November 2025 delivered targeted improvements across API and frontend, focusing on hosting governance, multi-currency expense workflows, and payout logic. The work enhanced data integrity, financial accuracy, and cross-border processing, enabling more reliable hosting management and better cross-currency reporting. Across opencollective/opencollective-api and opencollective/opencollective-frontend, we achieved measurable business value through focused refactors, validations, and cleanup.

October 2025

16 Commits • 5 Features

Oct 1, 2025

October 2025 delivered substantive backend and frontend improvements across opencollective-api and opencollective-frontend, focusing on data integrity, analytics, admin governance, and host-facing UX. Key features and fixes enhanced financial accuracy, trustable community metrics, and onboarding/management experiences for organizations and organizers, while stabilizing builds and reducing edge-case issues.

September 2025

16 Commits • 9 Features

Sep 1, 2025

September 2025: Delivered high-value frontend features, backend stability improvements, and performance optimizations that improved user experience, data visibility, and security across both frontend and API layers. Notable outcomes include expanded self-hosted ledger access, richer export data, and a streamlined team management experience, alongside targeted fixes that reduce financial risk and deployment payload.

August 2025

25 Commits • 7 Features

Aug 1, 2025

August 2025: Delivered a cohesive set of API and frontend improvements across opencollective-api and opencollective-frontend, advancing performance, scalability, security, and admin UX while expanding platform billing capabilities. Key outcomes include a refactored expense query path with simpler conditionals and post-filtering optimizations, new hosting/account governance (canHostAccounts) and currency-aware organization setup, a comprehensive Platform Subscriptions framework with tiers, billing and currency conversion, and cron-based automation for billing. Frontend work focused on admin dashboards, subscribers management, and enhanced expense/billing UX. Critical security policy work fixed 2FA enforcement to reduce friction and misconfigurations. The combined efforts improved operational efficiency, accuracy of financial data, and developer experience across both APIs and UI.

July 2025

21 Commits • 9 Features

Jul 1, 2025

July 2025 delivered a concentrated set of business-critical UI and API enhancements, reinforced by reliability fixes and build optimizations. The month focused on bringing faster, more usable host management dashboards; streamlined organization onboarding and setup workflows; and expanded API capabilities for accounts, onboarding, and collective governance. Build-time improvements and cross-cutting fixes reduced risk and improved developer velocity, positioning the platform for smoother scale and adoption.

June 2025

12 Commits • 4 Features

Jun 1, 2025

June 2025: Delivered core frontend enhancements for financial workflows and strengthened backend controls, driving faster, more accurate processing and improved compliance. Implemented a comprehensive Expenses page overhaul with new filters and unified display, modernized Transactions page filtering and export flow, and improved refunds workflow. Fixed critical accessibility and reliability issues, including keyboard navigation in the attachment viewer, accurate CAPTCHA setup detection across providers, and removing automatic vendor-to-host approvals to enforce manual review. These changes reduce manual intervention, improve data integrity, and enable faster business decisions across financial operations.

May 2025

29 Commits • 12 Features

May 1, 2025

May 2025 focused on delivering robust cross-border payment capabilities, strengthening data reliability, and improving user-facing finance workflows across API and frontend. The work enabled multi-user Wise account handling, improved balance transfer flows, currency-aware reporting, and enhanced hosting-related insights and transaction disclosures, driving efficiency and accuracy for reconciliation and decision-making.

April 2025

23 Commits • 11 Features

Apr 1, 2025

Monthly summary for 2025-04 covering frontend and API deliverables across opencollective-frontend and opencollective-api. Highlights business value from UX improvements, performance optimizations, and robust data-layer enhancements, with a focus on reliability, security, and developer velocity.

March 2025

19 Commits • 6 Features

Mar 1, 2025

March 2025 monthly summary focusing on delivering business value through performance, reliability, and scalable domain customization. Key API and frontend improvements enhanced data integrity, billing reliability, and SEO readiness. Delivered incognito-aware contribution aggregation, targeted query performance improvements, robust Wise batch payment handling, and comprehensive white-label domain support with improved SSR and error reporting.

February 2025

20 Commits • 8 Features

Feb 1, 2025

February 2025 delivered policy-driven data collection, UI modernization, and UX enhancements across frontend and API, delivering measurable business value in contributor governance, data visibility, and workflow efficiency. The month combined policy improvements with UI refactors, UX overhauls, and security-conscious changes that streamline contributions, reporting, and payments processing.

January 2025

21 Commits • 8 Features

Jan 1, 2025

January 2025 focused on reliability, performance, and data integrity across both API and frontend layers. Key features shipped and bugs fixed delivered business value through faster budget reporting, safer error handling, improved contributor management, and a smoother user experience for expenses and exports. Highlights include backend performance optimizations, robust error tracking for scheduled jobs, and UX enhancements that reduce user friction and operational risk.

December 2024

26 Commits • 9 Features

Dec 1, 2024

December 2024 monthly summary focusing on delivering performance, accuracy, and business value across API and frontend layers. Notable outcomes include faster, more observable order/contribution data, richer analytics for recurring contributions, exposed and enriched expense/payout details, and improved developer tooling. Frontend enhancements refined the Contributions Dashboard and exports, while safer payout handling and data formatting reduced risk and manual rework.

November 2024

28 Commits • 13 Features

Nov 1, 2024

November 2024 monthly performance summary focusing on key features delivered, major fixes, and impact across frontend and API layers. Delivered critical enhancements to financial data exports, reliability improvements in Pay/Expense workflows, and performance/visibility gains in hosted data analytics. Strengthened security/session handling, expanded social integrations, and advanced drafting/locking controls for expenses. Highlighted contributions span two repositories: opencollective-frontend and opencollective-api, with notable improvements in data export, UI polish, data loading performance, and robust refund/expense processing.

Activity

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Quality Metrics

Correctness87.4%
Maintainability85.8%
Architecture82.4%
Performance81.4%
AI Usage22.0%

Skills & Technologies

Programming Languages

CSSGraphQLHTMLJavaScriptReactSQLSVGShellTypeScriptYAML

Technical Skills

API DesignAPI DevelopmentAPI IntegrationAPI SecurityApollo ClientApollo ServerAsynchronous ProgrammingAuthenticationBackend DevelopmentBilling SystemsBug FixingBuild ToolsCSSCSV ExportCaching

Repositories Contributed To

2 repos

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

opencollective/opencollective-frontend

Nov 2024 Nov 2025
13 Months active

Languages Used

CSSGraphQLJavaScriptReactTypeScriptHTMLSVGtsx

Technical Skills

API IntegrationAuthenticationCSSCookie ManagementData ExportForm Handling

opencollective/opencollective-api

Nov 2024 Nov 2025
13 Months active

Languages Used

GraphQLJavaScriptSQLTypeScriptShellgraphqlYAML

Technical Skills

API DevelopmentAPI IntegrationBackend DevelopmentCommand Line Interface (CLI)Configuration ManagementDatabase Management

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