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Jiří Čermák

PROFILE

Jiří Čermák

Over a nine-month period, contributed to trezor/trezor-suite by building and refining features across blockchain integrations, trading workflows, and yield APIs. Leveraging TypeScript, React, and Node.js, delivered robust UI/UX improvements, enhanced security, and streamlined backend connectivity for staking, rewards, and asset management. The work included API development with OpenAPI and Zod validation, modularizing code for maintainability, and optimizing performance through state management and build tooling upgrades. Addressed reliability by fixing bugs, improving test infrastructure, and hardening security policies. This approach enabled scalable feature delivery, reduced runtime errors, and supported a seamless user experience across both web and desktop environments.

Overall Statistics

Feature vs Bugs

69%Features

Repository Contributions

244Total
Bugs
44
Commits
244
Features
99
Lines of code
96,305
Activity Months9

Work History

May 2026

17 Commits • 4 Features

May 1, 2026

May 2026 monthly summary for trezor/trezor-suite focusing on business value and technical impact. Highlights include delivering cross-network Merkle rewards with fresh data (no caching) and enabling rewards claim without a vault position, UX/data-flow improvements for yield opportunities, expanded stablecoin yield transaction simulation and UX, and a Yield Vault API/UI with post-claim refresh. The work emphasizes reliability, performance, and maintainability across the Earn Yield workflow and rewards ecosystem.

April 2026

27 Commits • 11 Features

Apr 1, 2026

April 2026 (2026-04) delivered a comprehensive set of stability, API consolidation, and security improvements for trezor-suite’s Earn and Stablecoin experiences, while laying groundwork for advanced yield simulations and rewards programs. The month balanced reliability improvements with user-facing feature enhancements and architectural refactors to support scalable growth.

March 2026

27 Commits • 17 Features

Mar 1, 2026

March 2026 performance summary for trezor/trezor-suite focused on delivering a scalable Earn staking capability, strengthening API ergonomics, and improving developer productivity through tooling and type-safety improvements. Key outcomes include the introduction of a new Earn Staking API module with OpenAPI-derived Zod schemas and TS types, validated HTTP services, and a types alignment strategy that enables faster feature delivery and safer refactors. We also delivered major integration work for Everstake, improving API validations and moving schema/types to @suite-common/wallet-api to break circular dependencies. In the UI/tooling and i18n space, we removed the intl dependency from toast notifications and other modules, added generic translation keys, and completed infrastructure fixes to fix performance issues in the tooling stack. Additional refactors and enhancements across staking, Solana rewards, and test infrastructure further increased code health and maintainability. Top business/value-focused achievements include: faster feature rollouts for Earn staking; reduced runtime risk due to schema relocation and stricter validations; and improved developer experience via improved ESLint/NX tooling and caching.

February 2026

6 Commits • 3 Features

Feb 1, 2026

February 2026 monthly summary for trezor-suite: Delivered core platform improvements across yield integration, security hardening, API surface generation, and tooling modernization. Focused on business value, scalability, and maintainability with concrete code changes across features and assets.

January 2026

45 Commits • 21 Features

Jan 1, 2026

January 2026 performance snapshot: Delivered major UX and reliability improvements in trezor-suite focused on asset selection, trading flows, and platform security. The work accelerated user workflows, reduced error modes, and laid groundwork for scalable internationalization and telemetry. Key business outcomes include smoother asset selection in trading (fewer mis-selections, faster trade setup), stronger test reliability (fewer flaky tests), and a modularized codebase enabling faster future iterations (asset-picker dir, new React Query provider).

December 2025

27 Commits • 5 Features

Dec 1, 2025

December 2025 monthly summary: Delivered tangible business value through a major UX uplift in the Trading UI and asset picker, strengthened typing and network config to reduce runtime errors, improved test reliability and CI stability, and resolved circular ESM issues across wallet-core and suite modules. These efforts improved trader productivity, platform stability, and maintainability, while enabling longer-term scalability.

November 2025

44 Commits • 19 Features

Nov 1, 2025

November 2025 (trezor/trezor-suite). Delivered user-centric UI improvements, analytics-ready telemetry, and performance optimizations across ADA/provider flows, global send/receive, and icon assets. Focused on business value by improving ADA adoption, reliability, and visual consistency while reducing rework through refactors and better componentization.

October 2025

29 Commits • 9 Features

Oct 1, 2025

October 2025 (trezor/trezor-suite): Delivered core features to enhance security visibility, data accuracy, and user experience, while modernizing the codebase with critical tooling upgrades. Key outcomes include MEV protection analytics integration, fiat-based token sorting, SOL rewards UX improvements, and targeted refactors that improve maintenance and reliability. These efforts drive measurable business value: clearer analytics, improved token decision-making for users, more robust reward information, and a more scalable, secure platform ready for rapid iteration.

September 2025

22 Commits • 10 Features

Sep 1, 2025

September 2025 highlights: Delivered cross-network graph feature integration with ADA support, extensive UI/UX refinements, and security hardening across trezor-suite and firmware. Achievements include multi-network feature propagation and backend-driven configuration; UX improvements with receive-address utilities and contextual tooltips; performance and polyfill optimizations; and a Hoodi-based Ethereum testnet upgrade for firmware.

Activity

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Quality Metrics

Correctness92.0%
Maintainability88.2%
Architecture88.6%
Performance87.2%
AI Usage25.4%

Skills & Technologies

Programming Languages

CHTMLJSONJavaScriptNodePythonSVGTypeScriptYAMLcss

Technical Skills

API DevelopmentAPI IntegrationAPI integrationAnalyticsAnalytics IntegrationBackend DevelopmentBigNumber manipulationBlockchainBuild System ManagementBuild ToolsCode MaintenanceCode OrganizationCode Ownership ManagementCode QualityCode Quality Improvement

Repositories Contributed To

2 repos

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

trezor/trezor-suite

Sep 2025 May 2026
9 Months active

Languages Used

JavaScriptSVGTypeScriptcsstsxJSONNodeYAML

Technical Skills

API IntegrationBuild ToolsCode MaintenanceCode OrganizationCode QualityComponent Refactoring

trezor/trezor-firmware

Sep 2025 Sep 2025
1 Month active

Languages Used

CPython

Technical Skills

BlockchainEthereumFirmware DevelopmentTestnet Management