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Simon Viénot

PROFILE

Simon Viénot

Simon Vienot developed and maintained core features for the hashgraph/hedera-mirror-node-explorer and related repositories, focusing on transaction tooling, UI/UX enhancements, and data reliability. He engineered solutions such as ERC token support, batch transaction handling, and staking reward calculations, using TypeScript, Vue.js, and Node.js. Simon refactored frontend architectures, improved state management, and introduced robust testing with Playwright and Vitest. His work addressed performance, security, and usability, including cache-driven UI optimizations and detailed transaction navigation. By aligning technical architecture with evolving business needs, Simon delivered maintainable, well-tested code that improved user experience and operational stability across Hedera’s explorer ecosystem.

Overall Statistics

Feature vs Bugs

74%Features

Repository Contributions

196Total
Bugs
30
Commits
196
Features
85
Lines of code
392,573
Activity Months17

Work History

February 2026

16 Commits • 5 Features

Feb 1, 2026

February 2026 delivered reliability, security, and user-experience improvements across two repos, emphasizing architecture alignment, test reliability, and configurable flexibility. Key outcomes include a public-key/node-location update for mainnet, HookStore refactor with updated hook type displays, improved Account Navigation E2E test reliability, and substantial UI/UX enhancements for Transaction Details, plus support for high_volume indicators and -1 in Max Automatic Token Associations. Expanded testing infrastructure supported forks and UI unit tests to improve CI stability and coverage.

January 2026

12 Commits • 7 Features

Jan 1, 2026

January 2026 delivered high-value features, reliability improvements, and workflow optimizations across Hedera Mirror Node and Transaction Tool. The work focused on improving data accuracy, user efficiency, and release reliability while enabling new capabilities for data presentation and transaction handling. Notable outcomes include accurate global staking reward rate calculations with a UI display and clarified tooltips; refactored transaction filtering and EntityID parsing for clearer data views; introduction of a fee collection account with enhanced transfer handling; TTv2 export/import enhancements with new content/filename generation and UI for exporting/signing; and an enhanced transaction navigation UX with a streamlined signing-to-next flow. Supporting work included a top-level README to improve onboarding and release workflow improvements to increase reliability, plus a dependency upgrade to 26.0.0 for explorer. Overall, these changes reduce operational risk, enable new revenue-related capabilities, and boost developer and user productivity.

December 2025

10 Commits • 6 Features

Dec 1, 2025

December 2025 monthly summary for developer work across hashgraph/hedera-transaction-tool and hashgraph/hedera-mirror-node-explorer. Delivered cross-repo improvements focusing on developer experience, UI polish, and business value. Key outcomes include TypeScript migration for automation tests, UI enhancements for transaction tables, cleanup of console warnings, and new accessibility features for contracts and Hiero hooks management.

November 2025

16 Commits • 5 Features

Nov 1, 2025

November 2025: Delivered focused enhancements in transaction tooling and explorer UX, driving control, reliability, and readability. Consolidated feature work in hedera-transaction-tool with fee-payer input, improved signing UX, and clearer transaction tables, while stabilizing error handling and dependencies. A linked bug fix in the mirror explorer addressed banner rendering and schedule ID errors, improving user feedback and reliability across the platform.

October 2025

12 Commits • 6 Features

Oct 1, 2025

October 2025 monthly performance summary for hashgraph development (2025-10). Key features delivered: - Export transaction groups to v1 format: Enhanced export header/details, added dependencies; refactored export logic; new utilities to generate export names and content. (repo: hashgraph/hedera-transaction-tool, commit ac1729e2193745dcfeb9ea5b45e3dba3d9c774a8) - Enhanced signing workflow: Individual signing within a group and improved 'Sign All' flow; UI/tooling improvements; fixed sign button spinning. (commits: e04bdcd2fb93a33f335587d71302e2e931ef8849; dadfa93b7ef03a1af5ce36962fdccb733edd459a) - User-configurable date/time display and timezone awareness: UTC/local formats; display of timezone name in local time; corrected executed_at display in Personal mode. (commits: c2abd06b3f6702adfae62f44ba95f1782d5cdb21; c6c9b7d84e8c7dd1acfcc841dfa69a9e80b1a4c3; 82160e97fb22f7cd0ccb6e79f1d50d601239e727) - Transaction tab/navigation UX improvements: Default to 'Ready for Action'; maintain context after saving/discarding drafts for consistent navigation. (commits: 9732a551658fcba0c5f92b9bf14d547c280add6d; b5213316cacd85248591e749fac81a8351824510; b99b823aefd1c192d5d1ab8ccdcda58ad43a740f) - Cancel All action on transaction groups and UI refinements: Added Cancel All button and refined header/notification handling. (commit 1880592aedcc4c9f44a0861a90915347ffd6fbcd) Major bugs fixed: - EVM Disassembler: Case-insensitive opcode lookup to prevent failures due to opcode casing; more robust bytecode analysis. (repo: hashgraph/hedera-mirror-node-explorer, commit e1919d4f229ef49ed7226b6881463dc587e6993b) - Signing flow: Fixed issue where sign buttons could remain spinning after actions. (commit dadfa93b7ef03a1af5ce36962fdccb733edd459a) Overall impact and accomplishments: - Accelerated delivery and reliability of core export and signing workflows, reducing manual steps and potential user errors. - Improved reporting accuracy across time zones with flexible date/time formatting. - Enhanced user experience through consistent navigation, focused UX improvements, and a safer Cancel All operation for bulk actions. - Strengthened system resilience via UI-driven features and groundwork for infrastructure reliability. Technologies and skills demonstrated: - Frontend/UI refinements (React-like patterns), backend workflow refactors, and robust time formatting/timezone handling. - Strong emphasis on developer UX with actionable tooltips and state management improvements. - Deployment reliability considerations (infrastructure restart hardening as a future actionable item).

September 2025

6 Commits • 4 Features

Sep 1, 2025

Monthly summary for 2025-09 focusing on delivered features, bug fixes, and impact across two repositories (hashgraph/hedera-transaction-tool and hashgraph/hedera-mirror-node-explorer).

August 2025

7 Commits • 3 Features

Aug 1, 2025

August 2025 monthly summary focusing on developer work across three repositories. Key frontend work in hashgraph/hedera-mirror-node-explorer included reorganization of the frontend under _frontend, upgrading TypeScript to 5.9.2, and updating dependencies to current versions; enhanced NodeTable UI with node account ID display, refined column headers, and improved stake tooltip; and UI styling/blob rendering improvements with CSS refactor and a compound-value class for large blob values. In hiero-ledger/solo, upgraded the explorer to 25.1.1 to apply bug fixes and small enhancements. In hashgraph/hedera-transaction-tool, fixed HBAR balance display by using formatHbar to correctly render leading zeros. These changes collectively improve data accuracy, user experience, and developer productivity while reducing maintenance burden through modernized tooling and dependencies.

July 2025

6 Commits • 1 Features

Jul 1, 2025

July 2025 performance highlights for hashgraph/hedera-mirror-node-explorer focused on reliability, UX improvements, and ongoing maintenance to keep dependencies fresh. Key features delivered include UI/UX modernization with a routing sub-tabs architecture and new content components (DocSnippet, ContractSectionTitle) to enhance information presentation and navigation. A major bug fix was implemented for EVM Address Encoding Normalization to ensure addresses are represented by the numeric portion only, improving compatibility with EVM tooling. In parallel, maintenance work aligned tests and linting with library updates, including dependency bumps and ESLint-related fixes to stabilize the test suite and build process. Overall impact: improved address accuracy, clearer detail pages, and a more stable development and testing environment, enabling faster and more reliable iterations for business users. Technologies/skills demonstrated: React/TypeScript UI development, component-driven design, routing architecture, UI icon migration, dependency management, and proactive test/lint maintenance.

June 2025

12 Commits • 5 Features

Jun 1, 2025

June 2025 performance summary focusing on business value, user experience, and technical stability across two repositories. Highlights include delivering UI-driven enhancements for node information and token/allowance data, upgrading the explorer component, and strengthening test reliability and rendering stability.

May 2025

18 Commits • 6 Features

May 1, 2025

May 2025 focused on expanding coverage, improving content delivery reliability, and tightening UI consistency for the Hedera Mirror Node Explorer. Delivered new contract type support, performance-conscious content delivery, and robust UI/components upgrades, while keeping dependencies current for security and stability. Key user-value outcomes include broader asset monitoring (ERC-1155), faster/safer content loading (HCS-1 Brotli), a cleaner, more navigable explorer UI, and more reliable dashboard interactions.

April 2025

16 Commits • 3 Features

Apr 1, 2025

April 2025 — Hashgraph Hedera Mirror Node Explorer: Delivered significant enhancements to transaction visibility, UI, and stability. Key features include batch transaction support (ATOMICBATCH) and enriched transaction details with HBAR price, decline_reward visibility, and refined CONTRACTCALL summaries. UI improvements cover fonts, dynamic network URL handling, theming/config, responsive tables, and rendering of custom fees. API reliability improved by masking HTTP 400 errors in ContractDetails. Maintenance work removed Sass dependency, updated dependencies, fixed YAML syntax, and strengthened QA/navigation tests. These changes increase business value by providing richer transaction insights across networks, more reliable contract data rendering, and improved developer experience and maintainability.

March 2025

30 Commits • 15 Features

Mar 1, 2025

March 2025 (hashgraph/hedera-mirror-node-explorer) delivered UI refinements, feature expansions, and stability improvements that drive reliability and user productivity. Key deliveries include a refactored notification banner (commit 25ab805e) and an updated InfoTooltip with a warning icon (commit 3baa39c3); built-in network color mapping to simplify theming (commit 0dfccb07); and ongoing capability work such as Admin Key Management for Nodes (commit 9b2382fa), Schedule Entities (commit 21a8dd68), Custom Fees in Topics (commit b75843ee), Non-zero Realms and Shards (commit a0508d3c), and Dusting transaction filter option (commit 2b3aef04). Additional quality and maintenance work included ESLint rollback (commit 9e65ba01) and various maintenance tasks (license SPDX update, dependency bumps, explorer customization).

February 2025

11 Commits • 7 Features

Feb 1, 2025

February 2025 monthly summary focusing on delivering business value through governance improvements, UI/UX enhancements, registry data expansion, and stability fixes across two repositories. Highlights include new team-management configuration for hiero-mirror-node-explorer, a comprehensive UI overhaul with theming support and CSS refactor, ERC-1155 token registry integration for mainnet/testnet, improved transaction navigation, and a critical UpdateAccountDialog safety and Vitest upgrade fix.

January 2025

1 Commits • 1 Features

Jan 1, 2025

January 2025: Delivered ERC token support in Hedera Mirror Node Explorer (hashgraph/hedera-mirror-node-explorer). Implemented ERC-20 and ERC-721 token coverage with UI to display token details, token lists by name, and search, plus refactoring and network config updates to integrate ERC token index URLs.

December 2024

10 Commits • 4 Features

Dec 1, 2024

December 2024 monthly summary for hashgraph/hedera-mirror-node-explorer focused on delivering data fidelity, UI reliability, and deployment readiness. Key features include HCS-1 content rendering and NFT metadata support with caching improvements, alongside targeted UI and branding updates. Major fixes address accurate node reward labeling, gas price and network fee calculations post-EIP-1559, and top navigation image stability, contributing to a smoother user experience and more trustworthy analytics. Branding and deployment changes align the project with Hiero branding, while dependency upgrades bolster security and performance across the stack.

November 2024

12 Commits • 6 Features

Nov 1, 2024

November 2024 monthly summary for hashgraph/hedera-mirror-node-explorer focusing on key features delivered, major bugs fixed, overall impact, and technologies demonstrated. Highlights cover NFT metadata and rendering enhancements, branding/UI configuration overhaul, Vue 3 Script Setup migrations, and removal of the token airdrop feature flag. A notable bug fix involved renaming and clarifying metrics-related components to NetworksMetrics for improved stability and clarity.

October 2024

1 Commits • 1 Features

Oct 1, 2024

JanuaryMonthly? Wait no, it's 2024-10. Create a concise monthly summary focusing on business value and technical achievements for the month of 2024-10 across the repo hashgraph/hedera-mirror-node-explorer. This month delivered a cache-driven performance improvement for Token Management UI and fixed UI state issues to ensure data freshness and reliability.

Activity

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Quality Metrics

Correctness90.8%
Maintainability88.4%
Architecture85.0%
Performance84.2%
AI Usage21.8%

Skills & Technologies

Programming Languages

BashCSSHTMLJSONJavaScriptMarkdownSCSSSVGShellTypeScript

Technical Skills

API IntegrationAPI integrationAsset ManagementBackend DevelopmentBuild ConfigurationBuild Tools ConfigurationBytecode AnalysisCI/CDCI/CD OptimizationCSSCSS StylingCSS VariablesCache ManagementCachingCaching Strategies

Repositories Contributed To

4 repos

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

hashgraph/hedera-mirror-node-explorer

Oct 2024 Feb 2026
17 Months active

Languages Used

JavaScriptTypeScriptVueCSSHTMLShelldotenvMarkdown

Technical Skills

API IntegrationCache ManagementFrontend DevelopmentJavaScriptState ManagementTypeScript

hashgraph/hedera-transaction-tool

Aug 2025 Feb 2026
7 Months active

Languages Used

TypeScriptJavaScriptSCSSVueYAMLCSSHTML

Technical Skills

Front-end DevelopmentFront End DevelopmentFrontend DevelopmentState ManagementTypeScriptUI/UX Development

hiero-ledger/solo

Jun 2025 Jan 2026
3 Months active

Languages Used

TypeScript

Technical Skills

Version ManagementDependency ManagementVersion Controldependency managementversion control

hiero-ledger/governance

Feb 2025 Feb 2025
1 Month active

Languages Used

YAML

Technical Skills

Configuration Management