google/perfetto
Oct 2024 – Oct 2025
13 Months active
Languages Used
C++JavaScriptPythonSQLTypeScriptMarkdownSCSSN/A
Technical Skills
API DesignBuild ScriptingC++Code GenerationCode RefactoringCodebase Maintenance
Steve Golton
PROFILE
Steve Golton
Steve Golton engineered core UI and data architecture for google/perfetto, delivering over 230 features and 87 bug fixes in 13 months. He modernized the frontend with TypeScript and SCSS, introducing a theming framework, reusable DataGrid components, and plugin-based extensibility. Steve refactored data handling to support BigInt IDs and optimized aggregation performance for large-scale telemetry. His work included robust release management with canary/stable rollouts, improved error handling, and enhanced trace visualization. By integrating SQL query optimization and advanced state management, Steve enabled scalable, reliable data exploration and analysis, demonstrating depth in frontend engineering, API design, and maintainable software architecture.
Overall Statistics
Feature vs Bugs
73%Features
Repository Contributions
489Total
Bugs
87
Commits
489
Features
231
Lines of code
91,274
Activity Months13
Your Network
4376 people
Work History
October 2025
31 Commits • 20 Features
Oct 1, 2025October 2025 monthly summary for google/perfetto focused on delivering UI/UX enhancements, API/data-model improvements, and stability fixes that drive business value and long-term maintainability. Key efforts centered on enabling safer incremental releases, improving user experience through theming and navigation polish, and expanding the data/ID model to support precise telemetry at scale.
31 Commits • 20 Features
Oct 1, 2025October 2025 monthly summary for google/perfetto focused on delivering UI/UX enhancements, API/data-model improvements, and stability fixes that drive business value and long-term maintainability. Key efforts centered on enabling safer incremental releases, improving user experience through theming and navigation polish, and expanding the data/ID model to support precise telemetry at scale.
October 2025
September 2025
45 Commits • 23 Features
Sep 1, 2025September 2025 highlights for google/perfetto: Delivered a set of UI enhancements, stability fixes, and architectural refactors that improve usability, reliability, and performance analysis capabilities. Key business value includes a cleaner UX with an optional callout close button; safer plugin behavior via exposed isInternalUser flag; faster, more intuitive copy actions; stronger visualization correctness with arrow rendering and track/title fixes; robust SliceTrack API supporting nullable durations and safer data handling; improved timing accuracy with self-time aggregation and flamegraph area intersections; and safer rollout of changes through canary releases and cohesive theming.
September 2025
45 Commits • 23 Features
Sep 1, 2025September 2025 highlights for google/perfetto: Delivered a set of UI enhancements, stability fixes, and architectural refactors that improve usability, reliability, and performance analysis capabilities. Key business value includes a cleaner UX with an optional callout close button; safer plugin behavior via exposed isInternalUser flag; faster, more intuitive copy actions; stronger visualization correctness with arrow rendering and track/title fixes; robust SliceTrack API supporting nullable durations and safer data handling; improved timing accuracy with self-time aggregation and flamegraph area intersections; and safer rollout of changes through canary releases and cohesive theming.
August 2025
53 Commits • 28 Features
Aug 1, 2025August 2025 was a UI-focused modernization sprint for Perfetto. The team delivered a cohesive theming framework built on CSS variables with a centralized root theme, enabling dark mode and theme-aware visuals across widgets. We standardized UI class naming with the pf- prefix to improve maintainability and onboarding. We introduced two new widgets (Tabs and CodeSnippet) and restructured the UI around a Page Container to align with the new layout system. We also strengthened architecture and developer experience by moving metrics/recording styles into plugin pages and merging SchedSummaries into the Sched plugin, and by enhancing AppState handling with a Result-based parse and persistence when loading traces via postMessage, plus fuzzy search for settings/plugins. Additionally, we shipped stability improvements including bug fixes for the scheduler guard, build timestamp printing, and large-trace crashes, boosting reliability and reducing risk for upcoming releases.
53 Commits • 28 Features
Aug 1, 2025August 2025 was a UI-focused modernization sprint for Perfetto. The team delivered a cohesive theming framework built on CSS variables with a centralized root theme, enabling dark mode and theme-aware visuals across widgets. We standardized UI class naming with the pf- prefix to improve maintainability and onboarding. We introduced two new widgets (Tabs and CodeSnippet) and restructured the UI around a Page Container to align with the new layout system. We also strengthened architecture and developer experience by moving metrics/recording styles into plugin pages and merging SchedSummaries into the Sched plugin, and by enhancing AppState handling with a Result-based parse and persistence when loading traces via postMessage, plus fuzzy search for settings/plugins. Additionally, we shipped stability improvements including bug fixes for the scheduler guard, build timestamp printing, and large-trace crashes, boosting reliability and reducing risk for upcoming releases.
August 2025
July 2025
37 Commits • 17 Features
Jul 1, 2025In July 2025, google/perfetto delivered significant UI improvements and stability enhancements that reduce risk in releases and improve data clarity for users. Key features included channel rollouts (canary and stable) across the UI to enable safer, incremental deployments, and comprehensive UI enhancements to aggregations and cards (durations formatting, sorting UX, unions, interval logic, and Card UI). The team also revamped the query page, stabilized the aggregator workflow, and added DataGrid loading progress indicators to speed up data analysis. Numerous polish and reliability improvements were shipped, including documentation updates, CSS/build tooling cleanup, and targeted bug fixes to Datagrid, flamegraph tooltips, and UI text.
July 2025
37 Commits • 17 Features
Jul 1, 2025In July 2025, google/perfetto delivered significant UI improvements and stability enhancements that reduce risk in releases and improve data clarity for users. Key features included channel rollouts (canary and stable) across the UI to enable safer, incremental deployments, and comprehensive UI enhancements to aggregations and cards (durations formatting, sorting UX, unions, interval logic, and Card UI). The team also revamped the query page, stabilized the aggregator workflow, and added DataGrid loading progress indicators to speed up data analysis. Numerous polish and reliability improvements were shipped, including documentation updates, CSS/build tooling cleanup, and targeted bug fixes to Datagrid, flamegraph tooltips, and UI text.
June 2025
26 Commits • 18 Features
Jun 1, 2025June 2025 performance summary for google/perfetto: Focused on reliability, performance, and UX improvements in data visualization and aggregation. Delivered high-impact features, addressed critical correctness and security issues, and advanced UI/data-model architecture to support scalable analytics. This work increased data accuracy, reduced crash surfaces (e.g., zero-length aggregations), hardened security patches, and enabled faster, more intuitive data exploration for developers and operators.
26 Commits • 18 Features
Jun 1, 2025June 2025 performance summary for google/perfetto: Focused on reliability, performance, and UX improvements in data visualization and aggregation. Delivered high-impact features, addressed critical correctness and security issues, and advanced UI/data-model architecture to support scalable analytics. This work increased data accuracy, reduced crash surfaces (e.g., zero-length aggregations), hardened security patches, and enabled faster, more intuitive data exploration for developers and operators.
June 2025
May 2025
41 Commits • 25 Features
May 1, 2025May 2025 performance and product summary for google/perfetto: delivered a focused set of business-value features, architectural improvements, and stability fixes that enhance data exploration, scalability, and reliability. Key features include a reusable DataGrid widget, a major DatasetSliceTrack overhaul with layer support and dynamic datasets, and SQL/grammar improvements to improve query reliability. UX enhancements such as an example tabs plugin, a productive R hotkey for area selection, and a mini query page tab improve analyst efficiency. A controlled UI rollout to stable and canary channels accelerated feedback while reducing risk. Critical fixes addressed crashes, UI hangs, and loading issues, contributing to a more robust user experience and smoother rollouts.
May 2025
41 Commits • 25 Features
May 1, 2025May 2025 performance and product summary for google/perfetto: delivered a focused set of business-value features, architectural improvements, and stability fixes that enhance data exploration, scalability, and reliability. Key features include a reusable DataGrid widget, a major DatasetSliceTrack overhaul with layer support and dynamic datasets, and SQL/grammar improvements to improve query reliability. UX enhancements such as an example tabs plugin, a productive R hotkey for area selection, and a mini query page tab improve analyst efficiency. A controlled UI rollout to stable and canary channels accelerated feedback while reducing risk. Critical fixes addressed crashes, UI hangs, and loading issues, contributing to a more robust user experience and smoother rollouts.
April 2025
39 Commits • 25 Features
Apr 1, 2025April 2025 performance summary for google/perfetto focusing on delivering a more usable UI experience, stronger navigation reliability, and scalable release tooling. The month emphasized DOM-based tooltips, UI consistency, and accessibility improvements across tracks, along with hotkey resilience and observability enhancements. Clouded by release automation and settings modernization, the team moved toward more predictable deployments and clearer trace context.
39 Commits • 25 Features
Apr 1, 2025April 2025 performance summary for google/perfetto focusing on delivering a more usable UI experience, stronger navigation reliability, and scalable release tooling. The month emphasized DOM-based tooltips, UI consistency, and accessibility improvements across tracks, along with hotkey resilience and observability enhancements. Clouded by release automation and settings modernization, the team moved toward more predictable deployments and clearer trace context.
April 2025
March 2025
24 Commits • 6 Features
Mar 1, 2025March 2025 accomplishments for google/perfetto: Delivered major UI/UX enhancements and stability improvements that drive business value by enabling faster data exploration and more reliable performance on large traces. Key changes include dataset-based UI search with batching large unions via CTEs to avoid SQLite limits, virtualization of the query results table, improved track details panels using SliceRef, query formatting refinements, support for uniondataset widening, and CSS improvements for line wrapping. Refactored core code to use engine.query instead of runQuery across breakdown tracks, added structured args for trace processing, and introduced pluginable track filters. Strengthened quality with longer test timeouts for large traces, idle detector timeout, screenshot fixes, and fixes for crashes when saving tracks that don’t exist in the workspace. UX improvements clarify when pinned tracks cannot be restored. UI improvements to the query results table include pagination, removal of the 30k row limit, text wrapping fixes, and better handling for nullable logs. Technologies demonstrated: TypeScript/JS, UI/UX design, SQL/CTE optimization, virtualization, CSS refinements, and robust test and refactor practices.
March 2025
24 Commits • 6 Features
Mar 1, 2025March 2025 accomplishments for google/perfetto: Delivered major UI/UX enhancements and stability improvements that drive business value by enabling faster data exploration and more reliable performance on large traces. Key changes include dataset-based UI search with batching large unions via CTEs to avoid SQLite limits, virtualization of the query results table, improved track details panels using SliceRef, query formatting refinements, support for uniondataset widening, and CSS improvements for line wrapping. Refactored core code to use engine.query instead of runQuery across breakdown tracks, added structured args for trace processing, and introduced pluginable track filters. Strengthened quality with longer test timeouts for large traces, idle detector timeout, screenshot fixes, and fixes for crashes when saving tracks that don’t exist in the workspace. UX improvements clarify when pinned tracks cannot be restored. UI improvements to the query results table include pagination, removal of the 30k row limit, text wrapping fixes, and better handling for nullable logs. Technologies demonstrated: TypeScript/JS, UI/UX design, SQL/CTE optimization, virtualization, CSS refinements, and robust test and refactor practices.
February 2025
37 Commits • 12 Features
Feb 1, 2025February 2025 monthly summary for google/perfetto focusing on UI/UX stability, performance improvements, and release engineering. Delivered features to aid debugging and readability, stabilized the release process, and tightened data handling to reduce user-visible errors. Business impact includes faster issue diagnosis, more reliable UI releases, and improved performance metrics visibility across the UI.
37 Commits • 12 Features
Feb 1, 2025February 2025 monthly summary for google/perfetto focusing on UI/UX stability, performance improvements, and release engineering. Delivered features to aid debugging and readability, stabilized the release process, and tightened data handling to reduce user-visible errors. Business impact includes faster issue diagnosis, more reliable UI releases, and improved performance metrics visibility across the UI.
February 2025
January 2025
66 Commits • 25 Features
Jan 1, 2025January 2025 – google/perfetto: Delivered stability-focused UI refinements, critical crash fixes, and expanded DatasetSliceTrack capabilities that boost performance and data visualization. Highlights: UI refinements (subtitle overflow containment, track border fix, zoom alignment on resize, full-width overview timeline, and PopupMenu rename); major crash fixes (crashes when resolving a frames track via selectSqlEvent; DNF slices; sleeping thread state slice; guard for trace duration = 0); DatasetSliceTrack expansion (new track, API updates like rootTableName and detailsPanel, performance improvements, and porting Android logs track); Canary rollout and automation; and workspace/track-management enhancements (copy/move tracks to new workspace, editable workspaces, and a reusable track menu component).
January 2025
66 Commits • 25 Features
Jan 1, 2025January 2025 – google/perfetto: Delivered stability-focused UI refinements, critical crash fixes, and expanded DatasetSliceTrack capabilities that boost performance and data visualization. Highlights: UI refinements (subtitle overflow containment, track border fix, zoom alignment on resize, full-width overview timeline, and PopupMenu rename); major crash fixes (crashes when resolving a frames track via selectSqlEvent; DNF slices; sleeping thread state slice; guard for trace duration = 0); DatasetSliceTrack expansion (new track, API updates like rootTableName and detailsPanel, performance improvements, and porting Android logs track); Canary rollout and automation; and workspace/track-management enhancements (copy/move tracks to new workspace, editable workspaces, and a reusable track menu component).
December 2024
44 Commits • 18 Features
Dec 1, 2024December 2024: Performance, UX and stability focus for google/perfetto, delivering high-value UI improvements, data-driven interactions, and safer rollout capabilities. Key work spanned feature flag governance for legacy UI, advanced canvas/overlay rendering enhancements, dataset-backed aggregations, and a comprehensive ViewerPage overhaul. Typed omnibox prompts, improved track editing UX, and targeted performance optimizations reduced redraws and improved responsiveness. Canary releases and developer experience improvements (SCSS hot reload, presubmit messaging) supported safer delivery and faster iteration.
44 Commits • 18 Features
Dec 1, 2024December 2024: Performance, UX and stability focus for google/perfetto, delivering high-value UI improvements, data-driven interactions, and safer rollout capabilities. Key work spanned feature flag governance for legacy UI, advanced canvas/overlay rendering enhancements, dataset-backed aggregations, and a comprehensive ViewerPage overhaul. Typed omnibox prompts, improved track editing UX, and targeted performance optimizations reduced redraws and improved responsiveness. Canary releases and developer experience improvements (SCSS hot reload, presubmit messaging) supported safer delivery and faster iteration.
December 2024
November 2024
32 Commits • 9 Features
Nov 1, 2024November 2024 performance milestones for google/perfetto: delivered dataset capabilities with area aggregations across most slice tracks, migrated to OO Dataset, fixed missing cpu column in ftrace datasets, and enabled exporting dataset from CPU slice tracks. implemented comprehensive UI stability and interactivity improvements and replaced legacy UI components for better consistency. achieved substantial UI performance improvements, including faster classNames(), improved track lookups (findTrackByUri, getTracksById), and smoother rendering for pinned tracks and flows. fixed critical bugs (sdebug counter track crashes, flows rendering for frames tracks, rendering during trace load, and area selector typos). reorganized UI codebase for maintainability, introduced plugin-scoped SCSS, and adopted zod-based feature flag parsing; rolled out canary UI to monitor impact. Technologies demonstrated: TypeScript/React, OO design for data structures, performance profiling and rendering optimizations, plugin architecture, and canary rollout practices.
November 2024
32 Commits • 9 Features
Nov 1, 2024November 2024 performance milestones for google/perfetto: delivered dataset capabilities with area aggregations across most slice tracks, migrated to OO Dataset, fixed missing cpu column in ftrace datasets, and enabled exporting dataset from CPU slice tracks. implemented comprehensive UI stability and interactivity improvements and replaced legacy UI components for better consistency. achieved substantial UI performance improvements, including faster classNames(), improved track lookups (findTrackByUri, getTracksById), and smoother rendering for pinned tracks and flows. fixed critical bugs (sdebug counter track crashes, flows rendering for frames tracks, rendering during trace load, and area selector typos). reorganized UI codebase for maintainability, introduced plugin-scoped SCSS, and adopted zod-based feature flag parsing; rolled out canary UI to monitor impact. Technologies demonstrated: TypeScript/React, OO design for data structures, performance profiling and rendering optimizations, plugin architecture, and canary rollout practices.
October 2024
14 Commits • 5 Features
Oct 1, 2024October 2024 performance summary for google/perfetto focused on stability, reliability, and maintainability of the UI and plugin ecosystem. Implemented robust plugin import filtering, lifecycle-driven resource management, and a modernized plugin architecture. Replaced a home-grown fuzzy finder with the fzf library to improve search relevance and UI responsiveness. Resolved visualization bugs and performed codebase cleanups to reduce technical debt. These changes reduce runtime failures, improve developer experience, and enable smoother plugin activation and maintenance at scale.
14 Commits • 5 Features
Oct 1, 2024October 2024 performance summary for google/perfetto focused on stability, reliability, and maintainability of the UI and plugin ecosystem. Implemented robust plugin import filtering, lifecycle-driven resource management, and a modernized plugin architecture. Replaced a home-grown fuzzy finder with the fzf library to improve search relevance and UI responsiveness. Resolved visualization bugs and performed codebase cleanups to reduce technical debt. These changes reduce runtime failures, improve developer experience, and enable smoother plugin activation and maintenance at scale.
October 2024
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Quality Metrics
Correctness92.6%
Maintainability91.4%
Architecture89.0%
Performance87.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
BinaryC++CSSGNJavaJavaScriptMarkdownN/ANonePython
Technical Skills
API DesignApplication ArchitectureAsynchronous ProgrammingBEMBackend DevelopmentBigInt HandlingBrowser AutomationBug FixingBuild AutomationBuild ManagementBuild ScriptingBuild SystemBuild System ConfigurationBuild SystemsC++
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