ava-labs/core-extension
Oct 2024 – Mar 2026
18 Months active
Languages Used
JavaScriptTypeScriptJSONCSSHTMLYAMLSVGShell
Technical Skills
Full Stack DevelopmentJavaScriptRefactoringSDK IntegrationSchema MigrationTypeScript
Michał Leszczyk
PROFILE
Michał Leszczyk
Over an 18-month period, contributed extensively to ava-labs/core-extension, delivering 89 features and resolving 73 bugs to advance cross-chain wallet, swap, and onboarding capabilities. Focused on robust full stack development using TypeScript, JavaScript, and React, the work spanned Solana, Avalanche, Bitcoin, and EVM integrations, with deep attention to UI/UX, security, and reliability. Implemented modular transaction management, hardware wallet support, and cross-network token flows, while modernizing CI/CD and release tooling. Addressed complex state management, error handling, and analytics integration, ensuring maintainable code and scalable architecture. The engineering approach emphasized clean code, rigorous testing, and iterative improvements to user experience.
Overall Statistics
Feature vs Bugs
55%Features
Repository Contributions
219Total
Bugs
73
Commits
219
Features
89
Lines of code
161,260
Activity Months18
Your Network
52 peopleSame Organization
@avalabs.org38
alexnicolae-avaMember
AminR443Member
An NguyenMember
Andrea VargasMember
BartoszMember
avalanche-devrel-botMember
Joachim Brandon LeBlancMember
Brian RidingsMember
cam-schultzMember
Work History
March 2026
21 Commits • 10 Features
Mar 1, 2026March 2026 focused on Fusion enhancements and reliability in the ava-labs/core-extension. Delivered cross-chain capability, improved input safety, and strengthened analytics to support data-driven decisions and better user experience. Key business value included Solana swaps support, max amount controls, and visibility of pending transfers, enabling smoother user flows and higher conversion, while analytics improvements and bug fixes reduced noise and increased trust.
21 Commits • 10 Features
Mar 1, 2026March 2026 focused on Fusion enhancements and reliability in the ava-labs/core-extension. Delivered cross-chain capability, improved input safety, and strengthened analytics to support data-driven decisions and better user experience. Key business value included Solana swaps support, max amount controls, and visibility of pending transfers, enabling smoother user flows and higher conversion, while analytics improvements and bug fixes reduced noise and increased trust.
March 2026
February 2026
20 Commits • 8 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for ava-labs/core-extension. This period delivered meaningful business value by improving reliability, cross-chain capabilities, and user experience, while expanding network support and tightening quality gates. Key outcomes include robust Fusion module enhancements, broader core-suite network enablement, and a more scalable, maintainable codebase demonstrated through targeted bug fixes and thoughtful UX improvements.
February 2026
20 Commits • 8 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for ava-labs/core-extension. This period delivered meaningful business value by improving reliability, cross-chain capabilities, and user experience, while expanding network support and tightening quality gates. Key outcomes include robust Fusion module enhancements, broader core-suite network enablement, and a more scalable, maintainable codebase demonstrated through targeted bug fixes and thoughtful UX improvements.
January 2026
12 Commits • 6 Features
Jan 1, 2026January 2026 — Monthly summary for ava-labs/core-extension. Focused on delivering business value through reliability, security, cross-chain capabilities, and developer experience. Major initiatives include CI/CD modernization for a next-gen codebase; Portfolio Management UI/UX enhancements with improved slippage handling, address management, loading states, and localization; Avalanche-powered message signing refactor to streamline approvals; Cross-Chain Asset Fusion feature with enhanced UI/state; and a dedicated Token Aggregator API Client. Significant bug fixes addressed side-panel robustness across browsers, Race condition in FIDO MFA flow, Ledger rejection handling, and swap network error handling and localization.
12 Commits • 6 Features
Jan 1, 2026January 2026 — Monthly summary for ava-labs/core-extension. Focused on delivering business value through reliability, security, cross-chain capabilities, and developer experience. Major initiatives include CI/CD modernization for a next-gen codebase; Portfolio Management UI/UX enhancements with improved slippage handling, address management, loading states, and localization; Avalanche-powered message signing refactor to streamline approvals; Cross-Chain Asset Fusion feature with enhanced UI/state; and a dedicated Token Aggregator API Client. Significant bug fixes addressed side-panel robustness across browsers, Race condition in FIDO MFA flow, Ledger rejection handling, and swap network error handling and localization.
January 2026
December 2025
25 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for ava-labs/core-extension: Delivered critical wallet reliability and security improvements with tangible business value. Implemented key derivation for seedless Solana and X/P wallets to unlock access for accounts without seed exposure. Hardened Ledger integration—fixing incorrect handling, popup behavior, and blind signing, with broader improvements including Bitcoin app support—reducing user friction and support tickets. Strengthened bridge safety with >0 and max amount enforcement to protect users from accidental transfers. Improved DApp connection stability and reduced open-state errors for smoother onboarding. Enabled default networks (Base, Arbitrum, Optimism) and ensured accounts derive from seeds, improving ecosystem onboarding and multi-chain usability.
December 2025
25 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for ava-labs/core-extension: Delivered critical wallet reliability and security improvements with tangible business value. Implemented key derivation for seedless Solana and X/P wallets to unlock access for accounts without seed exposure. Hardened Ledger integration—fixing incorrect handling, popup behavior, and blind signing, with broader improvements including Bitcoin app support—reducing user friction and support tickets. Strengthened bridge safety with >0 and max amount enforcement to protect users from accidental transfers. Improved DApp connection stability and reduced open-state errors for smoother onboarding. Enabled default networks (Base, Arbitrum, Optimism) and ensured accounts derive from seeds, improving ecosystem onboarding and multi-chain usability.
November 2025
9 Commits • 5 Features
Nov 1, 2025November 2025 focused on delivering user-centered features, hardening security, and improving cross-network data accuracy in ava-labs/core-extension. Delivered a new DApp Connection UI and Ledger wallet enhancements that enable seamless, multi-account interactions with DApps and improved hardware wallet support. Strengthened security and access control with a Domain Whitelist Enhancement. Improved data freshness and correctness with Balances Polling Optimization and NFT Listing Network Context refinements. These efforts collectively improve user experience, transaction reliability, and cross-network visibility, driving business value by reducing friction for end users and improving governance and security posture.
9 Commits • 5 Features
Nov 1, 2025November 2025 focused on delivering user-centered features, hardening security, and improving cross-network data accuracy in ava-labs/core-extension. Delivered a new DApp Connection UI and Ledger wallet enhancements that enable seamless, multi-account interactions with DApps and improved hardware wallet support. Strengthened security and access control with a Domain Whitelist Enhancement. Improved data freshness and correctness with Balances Polling Optimization and NFT Listing Network Context refinements. These efforts collectively improve user experience, transaction reliability, and cross-network visibility, driving business value by reducing friction for end users and improving governance and security posture.
November 2025
October 2025
6 Commits • 4 Features
Oct 1, 2025Month: 2025-10 | ava-labs/core-extension. Delivered four user-facing features, fixed critical UX bugs, and improved data quality for analytics. Key features include a Testnet Mode UI with an overlay and clear indicators to streamline testing on test networks; a customizable EVM gas limit for user control over transaction costs; UI/UX enhancements for fee display with a tooltip for full precision and protection against mnemonic copy; and internal networking/provider data cleanup plus event enrichment to standardize data structures and expose enabled networks. Major bug fixes include truncating overly precise transaction fee displays and disabling text selection on the recovery phrase, plus ensuring enabledNetworks is emitted on network update events. Overall impact: faster test cycles, safer UX, more flexible transaction controls, and cleaner network telemetry. Technologies/skills demonstrated: React/UX design, EVM parameter tuning, data normalization and enrichment, and robust code hygiene.
October 2025
6 Commits • 4 Features
Oct 1, 2025Month: 2025-10 | ava-labs/core-extension. Delivered four user-facing features, fixed critical UX bugs, and improved data quality for analytics. Key features include a Testnet Mode UI with an overlay and clear indicators to streamline testing on test networks; a customizable EVM gas limit for user control over transaction costs; UI/UX enhancements for fee display with a tooltip for full precision and protection against mnemonic copy; and internal networking/provider data cleanup plus event enrichment to standardize data structures and expose enabled networks. Major bug fixes include truncating overly precise transaction fee displays and disabling text selection on the recovery phrase, plus ensuring enabledNetworks is emitted on network update events. Overall impact: faster test cycles, safer UX, more flexible transaction controls, and cleaner network telemetry. Technologies/skills demonstrated: React/UX design, EVM parameter tuning, data normalization and enrichment, and robust code hygiene.
September 2025
8 Commits • 7 Features
Sep 1, 2025September 2025 (2025-09) delivered major cross-network enhancements in ava-labs/core-extension, driving better UX, security, and maintainability. Key features include an Enhanced Transaction Management UI with an EVM fee widget and multi-type approvals, a Comprehensive Swap feature with multiple liquidity providers and improved pricing/slippage, Solana approval screen details, Ledger Live account management integration, Avalanche network support with dedicated rendering and middleware updates, hardware wallet approval overlays, and internal architecture improvements including a generalized multi-network token hook and modular signing flow. Implemented via focused commits across the codebase (e.g., ed321328..., a86d6136..., 5219c3a8..., 25db2274..., c6422574..., fab873c7..., e49d37f6..., 0a830968...). The work enhanced cross-network usability, reliability, and developer velocity, enabling safer hardware wallet interactions, quicker onboarding of new networks, and stronger business value through improved user retention and engagement.
8 Commits • 7 Features
Sep 1, 2025September 2025 (2025-09) delivered major cross-network enhancements in ava-labs/core-extension, driving better UX, security, and maintainability. Key features include an Enhanced Transaction Management UI with an EVM fee widget and multi-type approvals, a Comprehensive Swap feature with multiple liquidity providers and improved pricing/slippage, Solana approval screen details, Ledger Live account management integration, Avalanche network support with dedicated rendering and middleware updates, hardware wallet approval overlays, and internal architecture improvements including a generalized multi-network token hook and modular signing flow. Implemented via focused commits across the codebase (e.g., ed321328..., a86d6136..., 5219c3a8..., 25db2274..., c6422574..., fab873c7..., e49d37f6..., 0a830968...). The work enhanced cross-network usability, reliability, and developer velocity, enabling safer hardware wallet interactions, quicker onboarding of new networks, and stronger business value through improved user retention and engagement.
September 2025
August 2025
10 Commits • 6 Features
Aug 1, 2025August 2025 highlights for ava-labs/core-extension focused on elevating the Send UX, expanding cross-chain token capabilities, and strengthening reliability and DApp interactions. Delivered the NextGen Send experience with an AccountSelect component and improved recipient workflow; extended token handling with new TokenSelect and TokenAmountInput featuring dynamic font sizing and presets; implemented a robust retry mechanism (linear-then-exponential backoff) to reduce confirmation delays for swaps; introduced a refined DApp approval screen with EVM-specific data handling and improved navigation; expanded cross-chain ERC-20 token sending across multiple networks (EVM, Bitcoin, Avalanche X-Chain/P-Chain, and Solana) and refactored send UI accordingly; and updated internal dependencies to newer vm modules to keep builds current. Also resolved a Solana-unsupported wallet blank screen with guidance and improved default account selection.
August 2025
10 Commits • 6 Features
Aug 1, 2025August 2025 highlights for ava-labs/core-extension focused on elevating the Send UX, expanding cross-chain token capabilities, and strengthening reliability and DApp interactions. Delivered the NextGen Send experience with an AccountSelect component and improved recipient workflow; extended token handling with new TokenSelect and TokenAmountInput featuring dynamic font sizing and presets; implemented a robust retry mechanism (linear-then-exponential backoff) to reduce confirmation delays for swaps; introduced a refined DApp approval screen with EVM-specific data handling and improved navigation; expanded cross-chain ERC-20 token sending across multiple networks (EVM, Bitcoin, Avalanche X-Chain/P-Chain, and Solana) and refactored send UI accordingly; and updated internal dependencies to newer vm modules to keep builds current. Also resolved a Solana-unsupported wallet blank screen with guidance and improved default account selection.
July 2025
22 Commits • 11 Features
Jul 1, 2025July 2025 focused on accelerating NextGen onboarding, expanding wallet import and hardware wallet support, and strengthening core flows across NextGen and Legacy Solana. Delivered seedless onboarding for new users, onboarding analytics, QR/USB Keystone onboarding, Ledger support, recovery-phrase import, and a Receive Crypto screen; refactored onboarding modal; expanded NextGen Settings and Contacts; and announced Legacy Solana support. Fixed stability and correctness issues across bridging fiat display, Bitcoin, seedless EIP-191 signing, active-account chain filtering, AccountsService locking, onboarding navigation, Solana key derivation, provider resolution, Sentry rate limiting, and k2-related changes. Business impact: smoother onboarding, broader device compatibility, improved stability, and actionable telemetry for product decisions.
22 Commits • 11 Features
Jul 1, 2025July 2025 focused on accelerating NextGen onboarding, expanding wallet import and hardware wallet support, and strengthening core flows across NextGen and Legacy Solana. Delivered seedless onboarding for new users, onboarding analytics, QR/USB Keystone onboarding, Ledger support, recovery-phrase import, and a Receive Crypto screen; refactored onboarding modal; expanded NextGen Settings and Contacts; and announced Legacy Solana support. Fixed stability and correctness issues across bridging fiat display, Bitcoin, seedless EIP-191 signing, active-account chain filtering, AccountsService locking, onboarding navigation, Solana key derivation, provider resolution, Sentry rate limiting, and k2-related changes. Business impact: smoother onboarding, broader device compatibility, improved stability, and actionable telemetry for product decisions.
July 2025
June 2025
21 Commits • 3 Features
Jun 1, 2025June 2025 monthly summary for ava-labs/core-extension highlighting key features delivered, major bugs fixed, and overall impact across onboarding, release tooling, runtime stability, and build/config improvements.
June 2025
21 Commits • 3 Features
Jun 1, 2025June 2025 monthly summary for ava-labs/core-extension highlighting key features delivered, major bugs fixed, and overall impact across onboarding, release tooling, runtime stability, and build/config improvements.
May 2025
4 Commits • 2 Features
May 1, 2025In May 2025, delivered cross-chain swap functionality and UI improvements for ava-labs/core-extension, with a focus on expanding liquidity access, pricing accuracy, and user clarity. The work combined backend integration, UI polish, and robust fee handling to drive conversion and reliability across Solana-enabled flows.
4 Commits • 2 Features
May 1, 2025In May 2025, delivered cross-chain swap functionality and UI improvements for ava-labs/core-extension, with a focus on expanding liquidity access, pricing accuracy, and user clarity. The work combined backend integration, UI polish, and robust fee handling to drive conversion and reliability across Solana-enabled flows.
May 2025
April 2025
16 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for ava-labs/core-extension focused on delivering cross-network wallet capabilities, stabilizing balance and error handling, and cleaning up migration paths to support a broader user base and enterprise deployments.
April 2025
16 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for ava-labs/core-extension focused on delivering cross-network wallet capabilities, stabilizing balance and error handling, and cleaning up migration paths to support a broader user base and enterprise deployments.
March 2025
16 Commits • 6 Features
Mar 1, 2025March 2025 performance summary for ava-labs/core-extension. Delivered cross-chain features with a focus on reliability, security, and user experience; strengthened core address resolution, expanded Solana support, refined swap safety, and improved UI stability while maintaining release tooling and dependencies. These workstreams deliver tangible business value: broader multi-chain support, fewer user errors, and more robust product releases.
16 Commits • 6 Features
Mar 1, 2025March 2025 performance summary for ava-labs/core-extension. Delivered cross-chain features with a focus on reliability, security, and user experience; strengthened core address resolution, expanded Solana support, refined swap safety, and improved UI stability while maintaining release tooling and dependencies. These workstreams deliver tangible business value: broader multi-chain support, fewer user errors, and more robust product releases.
March 2025
February 2025
10 Commits • 6 Features
Feb 1, 2025February 2025 (Month: 2025-02) delivered a set of targeted feature improvements and reliability fixes for ava-labs/core-extension, focused on token handling, transaction processing, user-facing fees, and UX stability. The work reduced error states, improved feedback and observability, and simplified network configuration for maintainability and faster onboarding for users and developers.
February 2025
10 Commits • 6 Features
Feb 1, 2025February 2025 (Month: 2025-02) delivered a set of targeted feature improvements and reliability fixes for ava-labs/core-extension, focused on token handling, transaction processing, user-facing fees, and UX stability. The work reduced error states, improved feedback and observability, and simplified network configuration for maintainability and faster onboarding for users and developers.
January 2025
4 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for ava-labs/core-extension: focused on improving feature discoverability, security posture, transaction efficiency, and dependency stability. Delivered four key outcomes affecting core user flows and platform reliability.
4 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for ava-labs/core-extension: focused on improving feature discoverability, security posture, transaction efficiency, and dependency stability. Delivered four key outcomes affecting core user flows and platform reliability.
January 2025
December 2024
9 Commits • 4 Features
Dec 1, 2024December 2024: Delivered cross-chain interoperability and UX/robustness improvements for ava-labs/core-extension. Key outcomes include: migrating to the Unified Bridge SDK to enable ICTT and multiple bridge types; introducing a new account switcher with multi-account balance aggregation; UI/UX enhancements for wallets and SendForm; input handling and data integrity fixes; enhanced swap validation and error handling; and improved Ledger prompts to correctly identify required apps. These changes reduce user friction, enable new bridge surfaces, and improve reliability across wallets, swaps, and Ledger interactions.
December 2024
9 Commits • 4 Features
Dec 1, 2024December 2024: Delivered cross-chain interoperability and UX/robustness improvements for ava-labs/core-extension. Key outcomes include: migrating to the Unified Bridge SDK to enable ICTT and multiple bridge types; introducing a new account switcher with multi-account balance aggregation; UI/UX enhancements for wallets and SendForm; input handling and data integrity fixes; enhanced swap validation and error handling; and improved Ledger prompts to correctly identify required apps. These changes reduce user friction, enable new bridge surfaces, and improve reliability across wallets, swaps, and Ledger interactions.
November 2024
5 Commits • 2 Features
Nov 1, 2024November 2024 monthly summary for ava-labs/core-extension: Delivered key features enabling safer, more transparent transaction handling and more flexible fee management, along with targeted bug fixes that improved reliability and UX. The work enhanced transaction approvals and Avalanche transaction management, added dynamic P-chain fee customization, and refactored provider initialization and price warning logic to reduce noise and edge-case failures. These changes provide clearer business value for users and reduce operating risk by ensuring up-to-date signing flows, accurate spend visuals, and robust network provider handling.
5 Commits • 2 Features
Nov 1, 2024November 2024 monthly summary for ava-labs/core-extension: Delivered key features enabling safer, more transparent transaction handling and more flexible fee management, along with targeted bug fixes that improved reliability and UX. The work enhanced transaction approvals and Avalanche transaction management, added dynamic P-chain fee customization, and refactored provider initialization and price warning logic to reduce noise and edge-case failures. These changes provide clearer business value for users and reduce operating risk by ensuring up-to-date signing flows, accurate spend visuals, and robust network provider handling.
November 2024
October 2024
1 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for ava-labs/core-extension: Delivered a major SDK upgrade and refactor to enhance cross-chain asset transfers, data handling, and code health. Upgraded the Unified Bridge SDK and refactored the history service to operate on the new transaction analysis model; removed legacy bridge helper services; updated data models and performed schema migrations to align with the new SDK. The work reduces tech debt, improves data integrity, and enables future cross-chain feature work.
October 2024
1 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for ava-labs/core-extension: Delivered a major SDK upgrade and refactor to enhance cross-chain asset transfers, data handling, and code health. Upgraded the Unified Bridge SDK and refactored the history service to operate on the new transaction analysis model; removed legacy bridge helper services; updated data models and performed schema migrations to align with the new SDK. The work reduces tech debt, improves data integrity, and enables future cross-chain feature work.
Activity
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Quality Metrics
Correctness87.6%
Maintainability84.2%
Architecture83.8%
Performance81.6%
AI Usage30.0%
Skills & Technologies
Programming Languages
CSSHTMLJSONJavaScriptSVGShellTypeScriptYAMLsvgtsx
Technical Skills
API DesignAPI DevelopmentAPI IntegrationAddress ValidationAllowance ManagementAnalytics IntegrationAnimationAsynchronous ProgrammingAuthenticationAvalancheAvalanche IntegrationAvalanche SDKBackend DevelopmentBatch TransactionsBitcoin
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline