google/perfetto
Apr 2025 – Dec 2025
7 Months active
Languages Used
SCSSTypeScriptC++JavaScriptGNPythonSQL
Technical Skills
Data VisualizationFront-end DevelopmentFrontend DevelopmentSCSSSQL IntegrationTypeScript
Alexander Timin
PROFILE
Alexander Timin
Worked on the google/perfetto repository, delivering features and fixes across frontend and backend components over seven months. Built interactive data visualizations and enhanced SQL table viewers using TypeScript, SQL, and C++, enabling richer data exploration and more accurate analytics exports. Improved UI consistency and usability by refining argument handling, modularizing rendering logic, and implementing robust JSON serialization for trace events. Addressed code maintainability through targeted refactoring, expanded unit test coverage, and streamlined build system configuration. Focused on performance optimization and system programming, the work accelerated trace analysis workflows and improved reliability for developers and product teams using Perfetto’s tracing infrastructure.
Overall Statistics
Feature vs Bugs
73%Features
Repository Contributions
22Total
Bugs
4
Commits
22
Features
11
Lines of code
7,330
Activity Months7
Your Network
248 peopleShared Repositories
248
Work History
December 2025
5 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary focusing on key accomplishments across Perfetto. Delivered UI/SQLTable enhancements for better data visibility, improved slice table defaults, and a modular rendering architecture. Fixed JSON serialization for log_message trace events and streamlined UI argument handling for robust parsing. These changes accelerate data analysis, improve reliability of analytics exports, and reduce future maintenance through reusable components and clearer interfaces.
5 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary focusing on key accomplishments across Perfetto. Delivered UI/SQLTable enhancements for better data visibility, improved slice table defaults, and a modular rendering architecture. Fixed JSON serialization for log_message trace events and streamlined UI argument handling for robust parsing. These changes accelerate data analysis, improve reliability of analytics exports, and reduce future maintenance through reusable components and clearer interfaces.
December 2025
November 2025
5 Commits • 2 Features
Nov 1, 2025November 2025 achievements for google/perfetto focused on expanding data exploration capabilities, improving UI reliability, and ensuring data correctness. Key work delivered across features and bug fixes: - Table Viewer Enhancements: Added explicit casting of table columns to PerfettoSQL primitive types (int, double, string, boolean, timestamp, duration) and limited id types. Implemented UI-driven string transformations (length, substr, extract_regexp, remove_prefix/remove_suffix), enhanced rendering, and a serialization function to export table data for downstream tooling. - Pivot Table Enhancements: Extended pivot table to include columns that have been added or transformed by the user, enabling more flexible and expressive data manipulation. - Bug Fix: Correct Display of Unsigned Integers in SQLite Arguments with tests validating display across arg types, leveraging printf('%u') to preserve unsigned semantics. - Architectural Refinement: Removed the concept of supporting columns from SqlTable; introduced TableColumn.display for rendering, and added an intrinsic_serialise_arg(arg_set_id, key) function to return ArgValue proto, simplifying query generation and rendering while improving consistency. Overall impact: Improved data exploration surface and correctness, enabling richer data narratives and more predictable UI behavior for Perfetto users. Strengthened testing around numeric displays and expanded capabilities for user-driven data transformations.
November 2025
5 Commits • 2 Features
Nov 1, 2025November 2025 achievements for google/perfetto focused on expanding data exploration capabilities, improving UI reliability, and ensuring data correctness. Key work delivered across features and bug fixes: - Table Viewer Enhancements: Added explicit casting of table columns to PerfettoSQL primitive types (int, double, string, boolean, timestamp, duration) and limited id types. Implemented UI-driven string transformations (length, substr, extract_regexp, remove_prefix/remove_suffix), enhanced rendering, and a serialization function to export table data for downstream tooling. - Pivot Table Enhancements: Extended pivot table to include columns that have been added or transformed by the user, enabling more flexible and expressive data manipulation. - Bug Fix: Correct Display of Unsigned Integers in SQLite Arguments with tests validating display across arg types, leveraging printf('%u') to preserve unsigned semantics. - Architectural Refinement: Removed the concept of supporting columns from SqlTable; introduced TableColumn.display for rendering, and added an intrinsic_serialise_arg(arg_set_id, key) function to return ArgValue proto, simplifying query generation and rendering while improving consistency. Overall impact: Improved data exploration surface and correctness, enabling richer data narratives and more predictable UI behavior for Perfetto users. Strengthened testing around numeric displays and expanded capabilities for user-driven data transformations.
October 2025
4 Commits • 2 Features
Oct 1, 2025October 2025 performance-focused monthly update for google/perfetto: Delivered foundational JSON output capabilities and robust argument export in the trace processor, while preserving UI stability through controlled refactor and rollback. These efforts enhance data fidelity, enable potential migration from jsoncpp, and improve trace insights for developers and product teams.
4 Commits • 2 Features
Oct 1, 2025October 2025 performance-focused monthly update for google/perfetto: Delivered foundational JSON output capabilities and robust argument export in the trace processor, while preserving UI stability through controlled refactor and rollback. These efforts enhance data fidelity, enable potential migration from jsoncpp, and improve trace insights for developers and product teams.
October 2025
September 2025
3 Commits • 2 Features
Sep 1, 2025September 2025 performance summary for google/perfetto focusing on feature delivery, code quality, and business impact. Delivered scalable data visualization and clarified string handling APIs, with corresponding test coverage to ensure reliability and maintainability.
September 2025
3 Commits • 2 Features
Sep 1, 2025September 2025 performance summary for google/perfetto focusing on feature delivery, code quality, and business impact. Delivered scalable data visualization and clarified string handling APIs, with corresponding test coverage to ensure reliability and maintainability.
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025: Delivered UI-focused improvements in the Perfetto time-selection panel to accelerate trace analysis and reduce navigation friction for large traces. Implemented instant event markers, refined label positioning for non-instant events across zoom levels, and added off-viewport timestamp context on hover. These changes enhance accuracy and usability for performance investigations, enabling faster root-cause analysis and collaboration across teams.
2 Commits • 1 Features
Aug 1, 2025August 2025: Delivered UI-focused improvements in the Perfetto time-selection panel to accelerate trace analysis and reduce navigation friction for large traces. Implemented instant event markers, refined label positioning for non-instant events across zoom levels, and added off-viewport timestamp context on hover. These changes enhance accuracy and usability for performance investigations, enabling faster root-cause analysis and collaboration across teams.
August 2025
July 2025
1 Commits • 1 Features
Jul 1, 2025July 2025 (google/perfetto) focused on API ergonomics and test coverage for named tracks. Delivered a new NamedTrack::Global static method to simplify creation of named global tracks, reducing boilerplate and improving readability. Updated unit tests to validate the new API and ensure correct track descriptor and event logging, reinforcing confidence in instrumentation. No major bug fixes recorded for this repository this month. The changes enhance maintainability, accelerate instrumentation work, and align with Perfetto’s usability goals.
July 2025
1 Commits • 1 Features
Jul 1, 2025July 2025 (google/perfetto) focused on API ergonomics and test coverage for named tracks. Delivered a new NamedTrack::Global static method to simplify creation of named global tracks, reducing boilerplate and improving readability. Updated unit tests to validate the new API and ensure correct track descriptor and event logging, reinforcing confidence in instrumentation. No major bug fixes recorded for this repository this month. The changes enhance maintainability, accelerate instrumentation work, and align with Perfetto’s usability goals.
April 2025
2 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for google/perfetto: Focused on frontend data visualization and UI consistency. Delivered a new SQL bar chart component integrated in the table viewer enabling interactive exploration (click-through details, per-point filtering) and fixed a UI styling issue ensuring TextInput visuals are consistent across the app. These efforts improve UX, accelerate data analysis workflows, and strengthen alignment with the design system.
2 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for google/perfetto: Focused on frontend data visualization and UI consistency. Delivered a new SQL bar chart component integrated in the table viewer enabling interactive exploration (click-through details, per-point filtering) and fixed a UI styling issue ensuring TextInput visuals are consistent across the app. These efforts improve UX, accelerate data analysis workflows, and strengthen alignment with the design system.
April 2025
Activity
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Quality Metrics
Correctness92.2%
Maintainability87.2%
Architecture86.4%
Performance85.0%
AI Usage25.4%
Skills & Technologies
Programming Languages
C++GNJavaScriptPythonSCSSSQLTypeScript
Technical Skills
Build System (GN)Build System ConfigurationC++C++ DevelopmentC++ developmentCanvas APICodebase MaintenanceData VisualizationDebuggingFront End DevelopmentFront-end DevelopmentFrontend DevelopmentJSON HandlingJavaScriptMithril.js
Repositories Contributed To
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