google/perfetto
Oct 2024 – Apr 2026
19 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 visualization systems for google/perfetto, focusing on scalable analytics and maintainable architecture. Over 19 months, he delivered features such as a schema-driven DataGrid, a plugin-based timeline, and a WebGL renderer for high-performance trace rendering. His work emphasized robust TypeScript and JavaScript development, leveraging CSS and SCSS for theming and responsive design. Steve refactored APIs for reliability, introduced modular plugin infrastructure, and optimized performance for large datasets. By integrating advanced testing, release automation, and accessibility improvements, he ensured the codebase remained stable and extensible, supporting both developer productivity and a seamless user experience.
Overall Statistics
Feature vs Bugs
74%Features
Repository Contributions
714Total
Bugs
130
Commits
714
Features
362
Lines of code
189,196
Activity Months19
Your Network
4619 peopleSame Organization
@google.com4386
Benedict OdaiMember
Craig IngramMember
KayyuriMember
Scott SuarezMember
Agent2Agent (A2A) BotMember
Andreas AbelMember
Aadi KapurMember
Aadish GoelMember
Aahil MehtaMember
Shared Repositories
233
Work History
April 2026
6 Commits • 5 Features
Apr 1, 2026April 2026: Delivered a focused set of UX, reliability, and observability improvements to google/perfetto, consolidating typography, stabilizing the Timeline UI, simplifying rendering for bulk edits, enhancing node graph clarity, and improving task configuration visibility. These changes reduce asset footprint, improve user experience at varying zoom levels, and provide clearer logs and safer interactions, enabling faster iteration and fewer UI defects.
6 Commits • 5 Features
Apr 1, 2026April 2026: Delivered a focused set of UX, reliability, and observability improvements to google/perfetto, consolidating typography, stabilizing the Timeline UI, simplifying rendering for bulk edits, enhancing node graph clarity, and improving task configuration visibility. These changes reduce asset footprint, improve user experience at varying zoom levels, and provide clearer logs and safer interactions, enabling faster iteration and fewer UI defects.
April 2026
March 2026
52 Commits • 27 Features
Mar 1, 2026March 2026 (google/perfetto) monthly summary: Focused on high-ROI UI improvements, rendering stability, and release/testing reliability. Key outcomes include font size reduction for UI icons with automated update tooling, a fuzzy search UX upgrade (Minisearch) with camelCase tokenization, major UI architecture refinements (Timeline moved to a core plugin; QueryPage plugin improvements and Tabs modernization), rendering accuracy fixes (slice rendering precision, fillRatio, chevron rendering, minimap interactions), and improved test stability and release readiness (canary rollout, Playwright baseline/tolerance updates, pf-test-volatile). Business value: faster UI loads, more accurate search results, more maintainable UI architecture, and more reliable deployments and test runs.
March 2026
52 Commits • 27 Features
Mar 1, 2026March 2026 (google/perfetto) monthly summary: Focused on high-ROI UI improvements, rendering stability, and release/testing reliability. Key outcomes include font size reduction for UI icons with automated update tooling, a fuzzy search UX upgrade (Minisearch) with camelCase tokenization, major UI architecture refinements (Timeline moved to a core plugin; QueryPage plugin improvements and Tabs modernization), rendering accuracy fixes (slice rendering precision, fillRatio, chevron rendering, minimap interactions), and improved test stability and release readiness (canary rollout, Playwright baseline/tolerance updates, pf-test-volatile). Business value: faster UI loads, more accurate search results, more maintainable UI architecture, and more reliable deployments and test runs.
February 2026
38 Commits • 19 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for google/perfetto focusing on UI performance, stability, and data-grid scalability. Major work spanned WebGL-based rendering, rendering optimizations for large tracks, and data-grid QuerySlots refactor to improve responsiveness and developer productivity. Delivery emphasized business value: faster UI interactions, reliable test results, and scalable data presentation for performance profiling workflows.
38 Commits • 19 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for google/perfetto focusing on UI performance, stability, and data-grid scalability. Major work spanned WebGL-based rendering, rendering optimizations for large tracks, and data-grid QuerySlots refactor to improve responsiveness and developer productivity. Delivery emphasized business value: faster UI interactions, reliable test results, and scalable data presentation for performance profiling workflows.
February 2026
January 2026
37 Commits • 19 Features
Jan 1, 2026January 2026 monthly summary for google/perfetto focusing on UI/UX improvements, data-grid enhancements, and performance optimizations. Delivered major UI/UX refinements and performance improvements across the core query UI and data grid, with several refactors and enhancements that improve developer productivity and user experience. Key outcomes include a refactored multi-pane UI (SplitPanel renamed to DrawerPanel with a new SplitPanel widget) and a 3-way query page layout for faster data exploration; DataGrid enhancements including per-column IDs and distinct-value filtering; Query Page UX improvements with a loading state on Run, editor tabs, and a database explorer; performance optimizations such as caching parsed zod schemas, opening the ftrace tab on first ftrace group expansion, and moving trace.timeline out of the hot path, with measurable render-time reductions; testing and reliability improvements enabling greater parallelism in integration tests and rollouts through canaries and QuerySlot cancellation.
January 2026
37 Commits • 19 Features
Jan 1, 2026January 2026 monthly summary for google/perfetto focusing on UI/UX improvements, data-grid enhancements, and performance optimizations. Delivered major UI/UX refinements and performance improvements across the core query UI and data grid, with several refactors and enhancements that improve developer productivity and user experience. Key outcomes include a refactored multi-pane UI (SplitPanel renamed to DrawerPanel with a new SplitPanel widget) and a 3-way query page layout for faster data exploration; DataGrid enhancements including per-column IDs and distinct-value filtering; Query Page UX improvements with a loading state on Run, editor tabs, and a database explorer; performance optimizations such as caching parsed zod schemas, opening the ftrace tab on first ftrace group expansion, and moving trace.timeline out of the hot path, with measurable render-time reductions; testing and reliability improvements enabling greater parallelism in integration tests and rollouts through canaries and QuerySlot cancellation.
December 2025
37 Commits • 28 Features
Dec 1, 2025December 2025 (2025-12) was a high-velocity sprint focused on performance, data-grid architecture, and UX improvements in google/perfetto. The team delivered foundational schema-driven DataGrid capabilities, enhanced pivot and compound column support, and a suite of UI/UX refinements, while stabilizing releases and closing critical bug gaps that improved reliability and developer productivity.
37 Commits • 28 Features
Dec 1, 2025December 2025 (2025-12) was a high-velocity sprint focused on performance, data-grid architecture, and UX improvements in google/perfetto. The team delivered foundational schema-driven DataGrid capabilities, enhanced pivot and compound column support, and a suite of UI/UX refinements, while stabilizing releases and closing critical bug gaps that improved reliability and developer productivity.
December 2025
November 2025
55 Commits • 33 Features
Nov 1, 2025Overview for 2025-11: Delivered a set of user-focused frontend enhancements across NodeGraph, DataGrid, and UI layout, together with targeted reliability and performance improvements. The month emphasized business value through faster graph wiring, more robust data exploration, and cleaner, maintainable UI code. Release discipline was exercised with canary/stable rollouts and quality fixes to support a smoother release flow.
November 2025
55 Commits • 33 Features
Nov 1, 2025Overview for 2025-11: Delivered a set of user-focused frontend enhancements across NodeGraph, DataGrid, and UI layout, together with targeted reliability and performance improvements. The month emphasized business value through faster graph wiring, more robust data exploration, and cleaner, maintainable UI code. Release discipline was exercised with canary/stable rollouts and quality fixes to support a smoother release flow.
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
Activity
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Quality Metrics
Correctness93.2%
Maintainability89.8%
Architecture88.8%
Performance87.4%
AI Usage22.0%
Skills & Technologies
Programming Languages
BashBinaryC++CSSDockerfileGNHTMLJSONJavaJavaScript
Technical Skills
API DesignAPI DevelopmentApplication ArchitectureAsynchronous ProgrammingBEMBackend DevelopmentBigInt HandlingBrowser AutomationBug FixingBuild AutomationBuild ManagementBuild ScriptingBuild SystemBuild System ConfigurationBuild Systems
Repositories Contributed To
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