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Rhys Bartels-Waller

PROFILE

Rhys Bartels-waller

Over an 11-month period, contributed to the input-output-hk/lace and cardano-js-sdk repositories by delivering 27 features and resolving key bugs, with a focus on browser extension development, blockchain integration, and backend reliability. Work included integrating Sentry error monitoring, optimizing wallet polling intervals, and enhancing token price extraction using TypeScript, JavaScript, and Node.js. Improved user experience through UI/UX refinements, hardware wallet onboarding, and governance features, while maintaining robust CI/CD pipelines and secure dependency management. Addressed interoperability by refactoring API integrations and aligning with upstream libraries, ensuring maintainable code and accurate analytics for Cardano-based applications across both frontend and backend systems.

Overall Statistics

Feature vs Bugs

93%Features

Repository Contributions

43Total
Bugs
2
Commits
43
Features
27
Lines of code
11,278
Activity Months11

Work History

March 2026

1 Commits • 1 Features

Mar 1, 2026

Concise monthly summary for 2026-03 ( Lace repo: input-output-hk/lace ). Focused on delivering reliable token pricing data from GeckoTerminal API. Key feature delivered: Token Price Extraction Enhancement with dynamic price field selection based on whether the queried token is base or quote in the pool. This included adding a new utility function to determine the correct price field. Fixed a bug where the price was always taken from base_token_price_native_currency, which mispriced quote tokens in pools (e.g., USDCx). The change improves accuracy of token pricing data, reduces downstream errors, and strengthens pricing analytics across GeckoTerminal integration.

November 2025

1 Commits • 1 Features

Nov 1, 2025

November 2025 – Delivered a focused UI refinement in lace by removing the Discord social link from the Settings About page, supported by updated end-to-end tests; the change aligns with a streamlined social strategy and reduces UI surface area while maintaining test coverage and quality. No major bugs reported this month.

September 2025

11 Commits • 6 Features

Sep 1, 2025

September 2025: Delivered broader hardware wallet support and security improvements across cardano-js-sdk and lace. Key outcomes include Trezor derivation type support and getXpub fix, per-wallet Trezor config in wallet metadata, onboarding derivation type selection for Trezor on Lace, CI and dependency security hardening, and maintainability-focused refactors. Business value: improved wallet interoperability, stronger security posture, faster onboarding, and a more scalable codebase.

August 2025

5 Commits • 4 Features

Aug 1, 2025

August 2025 monthly summary focusing on key accomplishments, business value, and technical achievements across two repositories: input-output-hk/cardano-js-sdk and input-output-hk/lace. Delivered major feature work, stability improvements, and UX enhancements that streamline signing workflows, improve interoperability with upstream libraries, and modernize the build and dependency landscape.

April 2025

4 Commits • 2 Features

Apr 1, 2025

April 2025 monthly summary focusing on business value and technical achievements for input-output-hk/lace. Focused on performance, security, and CI/CD reliability. Delivered two user-facing features and one security fix, plus important DevOps improvements.

March 2025

1 Commits • 1 Features

Mar 1, 2025

March 2025 monthly summary focusing on key business and technical outcomes. Delivered KoraLabs Handle Resolution Integration in the cardano-js-sdk stack, enabling Cardano handle resolution via the KoraLabs public API. Implemented KoraLabsHandleProvider with support for handle resolution, health checks, and policy ID retrieval. Added unit tests and updated CI workflows to validate and maintain the feature. No major bugs reported this month; efforts focused on feature delivery and improving maintainability. Overall, this work enhances interoperability for downstream clients and reduces manual lookup friction.

February 2025

2 Commits • 1 Features

Feb 1, 2025

February 2025 ( Lace - input-output-hk/lace ) Key features delivered: - Browser Extension Wallet v1.20.0 release, delivering user-facing features including renaming wallets, governance tab, restored activity feed, improved input focusing, optimized caching, refined landing page, and opt-in debug logging. - Release engineering and documentation completed with version bump to v1.20.0 and release notes published to accompany the release. Major bugs fixed: - A set of release-notes–documented fixes associated with the v1.20.0 rollout, addressing UI consistency, input handling, and caching-related issues to improve reliability and user experience. Overall impact and accomplishments: - Substantial improvement to user experience and governance participation via the feature set in v1.20.0. - Smoother onboarding and day-to-day usage through UI refinements, activity feed restoration, and targeted performance optimizations. - Demonstrated disciplined release engineering and thorough documentation, enabling easier adoption and maintainability. Technologies/skills demonstrated: - Browser extension development (JavaScript/TypeScript), UI/UX improvements, and performance optimization (caching). - Release engineering, semantic versioning, and release-note documentation. - Feature delivery with end-user value and maintainable code changes.

January 2025

3 Commits • 3 Features

Jan 1, 2025

January 2025 (Lace) — Focused on reliability, performance, and release readiness. Delivered three key features with impactful business value and prepared the project for a clean release cycle. No explicit major bugs fixed this month; instead, we consolidated improvements that enhance user experience and developer experience.

December 2024

3 Commits • 2 Features

Dec 1, 2024

December 2024 — Lace repository: Delivered release management and UX improvements focusing on stability, test reliability, and groundwork for upcoming features. Key outcomes include version bumps (no functional changes) and a Sign Message Result UX enhancement with tests updated. No major functional bugs were fixed; emphasis on maintainability, release discipline, and user clarity in signing flows.

November 2024

9 Commits • 5 Features

Nov 1, 2024

November 2024: Focused on delivering business-value features, stabilizing production tooling, and simplifying architecture across lace and cardano-js-sdk. Emphasis on performance, reliability, and developer experience.

October 2024

3 Commits • 1 Features

Oct 1, 2024

In 2024-10, the lace repository delivered a key feature: Sentry error monitoring integration for the browser extension, coupled with an enhanced release pipeline. The work strengthens production observability, reduces mean time to detect and fix errors, and improves release quality by aligning source map uploads with the package build step. This was achieved through CI workflow updates and dedicated commits that initialize and configure Sentry in the release process.

Activity

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Quality Metrics

Correctness95.8%
Maintainability94.4%
Architecture93.0%
Performance88.8%
AI Usage20.4%

Skills & Technologies

Programming Languages

DockerfileHTMLHaskellJavaScriptMarkdownNixSCSSShellTypeScriptYAML

Technical Skills

API IntegrationAPI integrationBackend DevelopmentBlockchain IntegrationBrowser CompatibilityBrowser Extension DevelopmentBuild ToolsCI/CDCardanoCardano SDKCode OrganizationConfigurationConfiguration ManagementCryptographyDependency Management

Repositories Contributed To

2 repos

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

input-output-hk/lace

Oct 2024 Mar 2026
10 Months active

Languages Used

JavaScriptTypeScriptYAMLHTMLHaskellenvtsxSCSS

Technical Skills

Browser Extension DevelopmentCI/CDDevOpsError TrackingGitHub ActionsJavaScript Development

input-output-hk/cardano-js-sdk

Nov 2024 Sep 2025
4 Months active

Languages Used

JavaScriptMarkdownTypeScriptDockerfileNixShellYAML

Technical Skills

API IntegrationBackend DevelopmentBrowser CompatibilityDocumentationFull Stack DevelopmentJavaScript