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Sébastien Van Eyck

PROFILE

Sébastien Van Eyck

Sebastien Van Eyck contributed to MetaMask’s extension and mobile repositories by engineering robust hardware wallet integrations and improving end-to-end testing reliability. Over 14 months, he delivered features such as dedicated OneKey and Ledger keyring support, streamlined device onboarding, and enhanced error handling for multi-device workflows. Sebastien used JavaScript, TypeScript, and React to implement UI improvements, automate complex signing flows, and stabilize cross-platform user experiences. His work included expanding automated test coverage for Trezor and Ledger devices, addressing CI flakiness, and refining asset management in mobile. These efforts resulted in more reliable hardware wallet interactions and reduced user friction across MetaMask products.

Overall Statistics

Feature vs Bugs

41%Features

Repository Contributions

23Total
Bugs
13
Commits
23
Features
9
Lines of code
2,231
Activity Months14

Work History

February 2026

1 Commits • 1 Features

Feb 1, 2026

February 2026 monthly highlights for MetaMask/metamask-mobile focused on improving bridge flow reliability and user feedback. Implemented precise geolocation error messaging when an unsupported geolocation condition is encountered for a selected Real World Asset (RWA) token, strengthening the bridge UX and reducing ambiguity in failure scenarios.

January 2026

2 Commits

Jan 1, 2026

January 2026 monthly summary for MetaMask/metamask-mobile focused on bug fixes and UX improvements in the mobile app. The focus this month was on stabilizing the user experience in critical flows and maintaining asset categorization accuracy to support onboarding and trust.

November 2025

1 Commits

Nov 1, 2025

Month 2025-11 — Hardware wallet UX stabilization for MetaMask extension. Restored expanded view for hardware wallet device selection accessed from the sidepanel, improving accessibility and UX consistency. Commit traced fixes ensure reliable behavior (#37731).

October 2025

2 Commits

Oct 1, 2025

October 2025 monthly performance summary for MetaMask/metamask-extension focusing on delivering business value through reliability improvements, security hardening, and strengthened test coverage.

September 2025

2 Commits • 1 Features

Sep 1, 2025

September 2025 monthly summary for MetaMask metamask-extension: Delivered targeted enhancements to hardware-wallet testing and stabilized CI to improve release confidence. The month focused on expanding end-to-end validation for Trezor wallet transactions, while reducing CI noise by addressing flaky Ledger tests, setting the stage for safer, faster iterations.

August 2025

1 Commits • 1 Features

Aug 1, 2025

August 2025 focused on strengthening hardware-wallet testing for the MetaMask extension by delivering targeted e2e test coverage for Trezor personal sign flows, improving test quality, and expanding hardware-wallet validation. The work reduces release risk by catching integration gaps earlier and provides a foundation for more reliable signing workflows across devices.

July 2025

1 Commits

Jul 1, 2025

Month: 2025-07 — MetaMask/accounts: Ledger iframe timeout reliability improvement and related bug fix to stabilize hardware wallet interactions. Increased ledger iframe message timeout from 4000ms to 8000ms to mitigate Sentry-reported timeouts.

June 2025

1 Commits • 1 Features

Jun 1, 2025

June 2025 monthly summary for MetaMask metamask-extension: Delivered Ledger SignTypedData v4 end-to-end tests, added a test file and a stub keyring bridge to simulate signing, enabling automated validation of Ledger signing workflows for complex typed data messages from a test dApp. This work increases test coverage, reduces production risk in hardware wallet integrations, and supports CI stability. No major bugs fixed this month.

May 2025

1 Commits • 1 Features

May 1, 2025

2025-05 monthly summary for MetaMask extension focusing on hardware wallet onboarding improvement via QR connection flow. Delivered an end-to-end feature that restores OneKey hardware wallet option in the QR connection list, with UI elements to access purchase guidance and setup tutorials, and fixed a regression that had removed OneKey from the QR tutorial flow.

April 2025

4 Commits • 1 Features

Apr 1, 2025

April 2025 monthly summary for MetaMask development: Targeted UI simplifications and reliability improvements across extension and mobile, delivering cross-device consistency and reduced user friction. Key features delivered include removing OneKey hardware wallet integration from the extension UI to streamline hardware options and simplify maintenance. Major bug fixes include a Ledger multi-device banner in the extension that clearly informs users when multiple Ledger devices are connected, and stability fixes on MetaMask mobile to prevent crashes when a Ledger device is disconnected during a swap and to ensure the QR scanner modal can reopen after closing. These changes collectively reduce support burden, improve user trust, and enhance cross-device reliability while showcasing strong cross-platform engineering practices.

March 2025

3 Commits • 1 Features

Mar 1, 2025

Month 2025-03 — MetaMask extension: hardware wallet device management UX improvements and air-gapped keyring import fix. Implemented dedicated error messaging for attempting to connect multiple Ledger devices and introduced explicit OneKey device tagging in the account list to reduce confusion. Enhanced account labeling with uppercase OneKey labels for clearer device differentiation. Fixed the air-gapped keyring flow by returning only newly created accounts from addAccounts, enabling reliable multi-account imports via QR. These changes lower user friction, improve reliability of hardware wallet interactions, and expand multi-account workflows, delivering measurable business value.

February 2025

1 Commits • 1 Features

Feb 1, 2025

February 2025 monthly summary for MetaMask/accounts focusing on feature delivery, quality improvements, and business impact.

January 2025

2 Commits • 1 Features

Jan 1, 2025

January 2025 monthly summary for MetaMask extension development. Focused on hardware wallet reliability and expanded device support. Delivered two key items with direct business impact: improved EIP-712 signing reliability for Ledger users, and integration of OneKey hardware wallet support in the device selection flow.

November 2024

1 Commits

Nov 1, 2024

November 2024 monthly summary for MetaMask/accounts focused on reliability improvements and bug remediation in the Ledger Keyring workflow to support multi-device usage and improve QA outcomes.

Activity

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Quality Metrics

Correctness95.2%
Maintainability88.6%
Architecture87.0%
Performance86.0%
AI Usage21.8%

Skills & Technologies

Programming Languages

CSSJavaScriptTypeScripttsx

Technical Skills

Browser automationEnd-to-End TestingEnd-to-end testingError HandlingEthereumFront End DevelopmentFront-end DevelopmentFull Stack DevelopmentGitHardware Wallet IntegrationHardware wallet integrationJavaScriptJavaScript DevelopmentJestKeyring Management

Repositories Contributed To

3 repos

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

MetaMask/metamask-extension

Jan 2025 Nov 2025
9 Months active

Languages Used

CSSJavaScriptTypeScripttsx

Technical Skills

EthereumFront End DevelopmentHardware Wallet IntegrationJavaScriptLedgerNode.js

MetaMask/metamask-mobile

Apr 2025 Feb 2026
3 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

Error HandlingJavaScriptJestMobile DevelopmentReact NativeState Management

MetaMask/accounts

Nov 2024 Jul 2025
3 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

GitJavaScriptNode.jsTestingTypeScriptFull Stack Development

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