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Matt Jankowski

PROFILE

Matt Jankowski

Over the past 19 months, this developer delivered robust backend and API features for the mastodon/mastodon and thoughtbot/thoughtbot.social repositories, focusing on reliability, maintainability, and performance. They modernized test suites, improved data integrity, and streamlined configuration management using Ruby on Rails, RSpec, and JavaScript. Their work included upgrading dependencies, refactoring legacy code, and enhancing API validation and security. By migrating controller specs to system/request specs and introducing architectural patterns like concerns and scopes, they reduced technical debt and improved test reliability. Their contributions enabled safer deployments, faster iteration, and a more maintainable codebase supporting scalable product growth.

Overall Statistics

Feature vs Bugs

79%Features

Repository Contributions

723Total
Bugs
91
Commits
723
Features
342
Lines of code
41,285
Activity Months19

Work History

April 2026

25 Commits • 22 Features

Apr 1, 2026

April 2026: Focused on reliability, architecture, and tooling for mastodon/mastodon. Key features delivered include robust tootctl maintenance fix-duplicates support, centralized API approve/reject logic via approvable concern, standardized admin routes with a batch concern, and CI/code quality improvements by switching RuboCop output to GitHub format. Additional backend and UI improvements enhanced maintainability (e.g., rendering software updates with a collection partial) and clarified behavior around language filtering. Critical bug fixes were addressed to harden release quality (fields build spec resilient to changed size constant; fix hero image radius; remove invalid options from recovery codes controller). The month also encompassed targeted tooling upgrades (Vite, Sidekiq, Redis, Bundler) to improve performance, security, and compatibility, with config-driven defaults and minor index/lookup improvements contributing to overall responsiveness. Overall, these efforts reduce risk, accelerate delivery, and improve the developer experience.

March 2026

95 Commits • 34 Features

Mar 1, 2026

March 2026: Delivered a modernization pass across tooling, search, serialization, and platform readiness for mastodon/mastodon. Key outcomes include: (1) code quality tooling updates across RuboCop v1.85.0 compatibility, haml-lint upgrade, and related cops tuning to fix violations and enforce consistency; (2) Elasticsearch groundwork with basic ES-enabled index/service coverage and CI/devcontainer ES version synchronization to stabilize search and environments; (3) standardized JSON serialization across services (to_json/JSON.generate) and prep for backup/service cleanup to improve reliability and maintainability; (4) Rails 8.1 readiness with schema dumps, RemoteIp patch, InstancesIndex coverage, and locale handling in admin mailers for better compatibility; (5) platform modernization including Ruby 4.0.2 upgrade, dropping Ruby 3.2, and dependency upgrades (binding_of_caller 2.0.0, connection_pool 3.0.2, Bundler 4.0.8, Chewy 8.0.1) along with data migrations improvements and enhanced testing coverage.

February 2026

38 Commits • 11 Features

Feb 1, 2026

February 2026 monthly summary for mastodon/mastodon: Focused on strengthening test reliability, expanding API coverage, and modernizing the dependency stack to reduce risk and accelerate delivery. Key features delivered and quality improvements were achieved through targeted test suite modernization, broader test coverage for edge cases, and code quality refactors. Dev tooling updates and framework upgrades ensure alignment with the latest Rails ecosystem and smoother onboarding for contributors. A notable bug fix improved error handling in DOB validation. The combined effort yields faster, more reliable releases with clearer maintainability and stronger guardrails for API and admin paths.

January 2026

24 Commits • 12 Features

Jan 1, 2026

January 2026 saw tooling modernization, targeted quality improvements, and meaningful data-model and OAuth refinements across the mastodon/mastodon repo. The work improved maintainability, reduced risk of regressions, and prepared the codebase for faster feature delivery. Key outcomes include tooling upgrades, expanded test coverage for policy/validation logic, a new data model association, OAuth spec/controller refactors, and UI/admin UX enhancements that improve admin workflows and user signup experiences.

December 2025

18 Commits • 6 Features

Dec 1, 2025

Month: 2025-12. This period focused on strengthening core user identity flows, data integrity, and performance while delivering business value through reliable features and robust tests. Highlights include: - User Registration and Account Validation: delivered a cleaned registration flow with API-level validation for account creation and comprehensive tests. This reduces onboarding errors and protects data quality. Key commits touched: Remove duplicate set_locale around auth/registrations (#36455); Add coverage for Account.representative (#35996); Add spec for missing username value in create account API (#37057); Add coverage for user model registration time validation (#35993). - Tagging System Improvements: standardized tag display_name, strengthened tag creation logic, and added tests for tag name handling and concurrency to improve searchability and consistency under load. Notable commits include: Use normalizes API for Tag display_name (#35797); Add coverage for array vs string in Tag.find_or_create_by (#37113); Use thread support helper in concurrent insert tag spec (#37112). - Domain Handling Improvements: normalized and validated domain variants with broad tests for allowed/blocked domains, improving domain integrity across tenants and federations. Commit: Add coverage for "domain variants" consumers (#35995). - Follower Blocking Behavior: enforced that blocked accounts do not appear in followers or following lists, with dedicated tests to prevent leakage of blocked users. Commit: Add coverage for blocked account scenario in following/followers (#36042). - Code Quality, Dependencies, and Test Performance: ongoing maintenance and performance tuning, including patch cleanup, typo fixes, dependency updates, and test performance improvements; bundler upgrade and removal of outdated patches to streamline CI. Notable commits: Remove yarn patch for babel-plugin-lodash (#37161); Fix misc comment typos (#37183); Use bundler version 4.0.1 (#37191); Reduce factory creation across spec/helpers (#35527).

November 2025

24 Commits • 10 Features

Nov 1, 2025

November 2025: Delivered a suite of backend framework improvements, frontend tooling modernization, and targeted code-quality cleanups for mastodon/mastodon. These changes enhance stability, developer productivity, and compatibility with newer dependencies, while broadening test coverage and refining user-facing UI attributes.

October 2025

3 Commits • 3 Features

Oct 1, 2025

October 2025 monthly summary for mastodon/mastodon: Delivered targeted admin and frontend improvements focusing on business value, stability, and code quality. Key features include Admin Dashboard Pending Tags Count Enhancement with a dedicated tag filter and tests; Frontend CSS modernization aligning with linting rules; and Dependency/Bundler updates to stabilize dependencies. No major bugs fixed this month. Overall impact: improved admin accuracy for pending tags, reduced maintenance risk through updated dependencies, and a refreshed UI style. Technologies demonstrated: Ruby on Rails backend changes, Trends::TagFilter usage, Bundler/Gem management, SCSS/CSS modernization and stylelint compliance.

September 2025

10 Commits • 2 Features

Sep 1, 2025

September 2025 (mastodon/mastodon) focused on delivering high-value feature work, stabilizing the codebase through comprehensive maintenance, and strengthening test coverage to reduce regression risk. The efforts contributed to better export performance, cleaner code, and more reliable test suites that support faster iteration and business value delivery.

August 2025

30 Commits • 16 Features

Aug 1, 2025

August 2025 delivered targeted, business-focused improvements across mastodon/mastodon and thoughtbot.social, prioritizing correctness, performance, and maintainability. Key features delivered include username normalization via the Normalizes API, domain normalization for CustomEmoji, and API route enhancements for push_subscriptions, complemented by test coverage and quality improvements. Notable bug fixes tightened security and reliability (token handling, entity/content naming, and logging behavior) and maintenance work upgraded tooling and code quality to support ongoing velocity and scale.

July 2025

72 Commits • 41 Features

Jul 1, 2025

Summary for 2025-07: Delivered a broad set of reliability, stability, and maintainability improvements across mastodon/mastodon and thoughtbot/thoughtbot.social. Focus areas included expanded test coverage for locale and TOS flows, modernization of boolean attribute handling, migration safety, and admin/domain controls, complemented by tooling upgrades that reduce maintenance overhead. These changes reduce regression risk, enable faster feature delivery, and improve data integrity and governance across critical workflows.

June 2025

29 Commits • 19 Features

Jun 1, 2025

June 2025 summary for thoughtbot.social focused on improving code quality, tooling, testing reliability, and architectural clarity to enable safer Rails 8 transitions and faster feature delivery. Delivered targeted code quality fixes across cops (Style/FormatStringToken, Rails/OutputSafety, Style/FetchEnvVar, Style/OptionalBooleanParameter) and updated SafeReblogInsert to align with Rails 8 methods. Updated code quality tooling and test infrastructure: RuboCop upgraded to 1.76.x and 1.77.0; Selenium-based tests replaced with Playwright, improving test stability and speed. Enhanced test suite with environment/domain handling improvements and reduced hard-coded host/value dependencies, including QR/OTP simplifications. Implemented significant architectural and feature enhancements: extract Account::Mappings concern, move _map specs to mappings spec, DRYed month/year grouping in AnnualReport::TimeSeries, added Status#only_relogs scope for annual reports, extracted secret size constants in Webhook model, added User#email_domain, added coverage for Doorkeeper model extensions, and TermsOfService scopes/validations; aligned OAuth inflection and moved OAuth view layout to controllers. Addressed stability and business risk with critical fixes: limit admin/trends/tags counts to pending & trending; remove patch for an unsupported Redis version. Overall impact: stronger code health, reduced risk in Rails upgrades, and improved developer velocity with clearer ownership and better test reliability.

May 2025

21 Commits • 10 Features

May 1, 2025

May 2025 monthly summary for thoughtbot.social: Delivered a comprehensive upgrade and cleanup cycle that modernized dependencies, improved logging and observability, removed legacy secrets and storage dependencies, and tightened code quality—delivering tangible business value through security, maintainability, and performance improvements. The work aligns with ongoing platform reliability, faster CI cycles, and clearer artifact traceability.

April 2025

13 Commits • 1 Features

Apr 1, 2025

April 2025 (2025-04) monthly summary for thoughtbot.social: Key features delivered and bugs fixed: - API robustness and data integrity improvements: enforced validation and policy checks to prevent invalid data and rendering issues. Notable commits include: • 501ced4239ab685742706c18e7d5b9e418edb074 – Add coverage for extra attributes scenario in Admin::Trends::StatusesHelper#one_line_preview • aadff24099aced99c880a1dd65ea6fced9f7dff6 – Enable validate: true on CustomFilter#action • 2eaef09166396af3d8367a7d9b7b3b9d4d51103f – Use enum validation instead of ArgumentError rescue for List replies policy check - Code quality and maintenance improvements: targeted refactors, tooling updates, and dependency management to improve test reliability and readability. Notable commits include: • 6e607f97a38648eda689e69ab47e4e0e46c080f9 – Extract constant for Poll last fetch duration check • d315a90db740191de03d7edb7abf7a180f475408 – Convert settings/pictures spec controller->request • 4d3758308a5c65ecdc8d34631abbbc2c50f9f82e – Use bundler version 2.6.7 • 6deadd596d44a036ce2376d713092a805a81c593 – Remove deprecated single-argument variation of UnfilterNotificationsWorker • 4c2f64907bb7220db5c6323dd18fb8d37443741c – Remove deprecated Import model • de19af36500365ecb5993a456b56188da1c7c03e – Extract frontend_translations helper to support module • e7537769301d9f5467da2f749d7db460da8b621c – Fix Style/HashTransformValues cop • 2fc38f524ed700609469842458f43cf42503ea8a – Use bundler version 2.6.8 • 8dea1c422af5c497b6c8fbdb5743fe91862261cf – Combine examples to reduce factories in BulkImportWorker spec • 6463415e06d4d617e011adf7e184276f0007137a – Update rubocop-rspec to 3.6.0 Technologies and skills demonstrated: - Ruby on Rails, RSpec testing, and API validation patterns - Dependency management with Bundler and automated tooling upgrades - Static code analysis and linting improvements (RuboCop) and style fixes - Refactoring, test reliability improvements, and maintainability practices Overall impact and business value: - Increased API reliability and data integrity, reducing rendering errors and production risk - More deterministic tests and faster feedback for developers, improving velocity - A safer, maintainable codebase with clearer ownership and easier onboarding for new engineers

March 2025

31 Commits • 13 Features

Mar 1, 2025

March 2025: Focused on aligning the test suite with the System/Request testing architecture for thoughtbot.social, expanding coverage, and strengthening reliability and build quality. Key work includes widespread admin specs modernization (controller->system and system/request migrations), broader test migrations across filters, intents, activitypub, and settings, system helper cleanup, and coverage enhancements. Also delivered tooling upgrades (RuboCop, Bundler), dependency hygiene (mb_chars removal, AWS SDK core pin), and stability improvements addressing intermittent failures and flaky tests. Result: faster, more maintainable test feedback, reduced risk in deployments, and a clearer path for architectural evolution.

February 2025

32 Commits • 7 Features

Feb 1, 2025

February 2025 monthly summary for thoughtbot.social. The team focused on stability, performance and code quality across the codebase, delivering configuration improvements, test-suite modernization, asset hygiene, and tooling upgrades that reduce risk and accelerate future changes.

January 2025

78 Commits • 45 Features

Jan 1, 2025

January 2025 performance summary for thoughtbot.social focused on reliability, maintainability, and runtime readiness. The month delivered a substantial modernization of the test suite, targeted infrastructure improvements, and key runtime upgrades that enable faster delivery with higher confidence. The work combined end-to-end test coverage improvements, CI/tooling enhancements, and maintainability refinements that directly reduce defect leakage and accelerate iteration on product features.

December 2024

79 Commits • 29 Features

Dec 1, 2024

December 2024 was focused on delivering high-value features, strengthening data integrity, and elevating test quality across thoughtbot.social and schneems/rails. Key outcomes include robust testing utilities and coverage for core concerns, UX improvements, API/data governance, and platform-level quality improvements. These efforts reduce risk, improve performance and reliability, and support scalable product growth while strengthening developer efficiency through tooling upgrades and test-suite modernization. Tech stack and skills demonstrated include Ruby on Rails, RSpec/system specs, database constraints, serialization correctness, SEO enhancements, and CI/tooling improvements.

November 2024

61 Commits • 43 Features

Nov 1, 2024

November 2024 recap: Stabilized and modernized the platform by upgrading core frameworks, enhancing API surfaces, and cleaning technical debt across thoughtbot.social and rails.website. The work delivered improved maintainability, faster iteration, and safer deployments, with concrete gains in dependency management, data querying, and developer UX.

October 2024

40 Commits • 18 Features

Oct 1, 2024

October 2024 performance summary for developer work across two repositories: mastodon/mastodon and thoughtbot/thoughtbot.social. Focused on infrastructure uplift, QA improvements, and stack modernization to reduce risk and accelerate delivery. Delivered extensive test coverage, targeted refactors, and configuration cleanups that improve reliability, maintainability, and performance, while modernizing the tech stack and aligning dependencies.

Activity

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Quality Metrics

Correctness95.2%
Maintainability94.2%
Architecture89.2%
Performance89.6%
AI Usage20.2%

Skills & Technologies

Programming Languages

CSSDockerfileERBHAMLHTMLHamlHamlitJSONJavaScriptMarkdown

Technical Skills

API DevelopmentAPI IntegrationAPI IntegrationsAPI SecurityAPI TestingAPI developmentAPI testingActiveModelActiveRecordAsset ManagementAsset OptimizationAttribute HandlingAuthenticationAuthorizationBackend Development

Repositories Contributed To

4 repos

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

thoughtbot/thoughtbot.social

Oct 2024 Aug 2025
11 Months active

Languages Used

HTMLJavaScriptRubyYAMLMarkdownSQLCSSJSON

Technical Skills

Backend DevelopmentCI/CDCode CleanupCode RefactoringDatabase ManagementDependency Management

mastodon/mastodon

Oct 2024 Apr 2026
11 Months active

Languages Used

RubySVGYAMLHTMLHamlitJavaScriptRSpecHAML

Technical Skills

API TestingAsset ManagementBackend DevelopmentBackground JobsCode CleanupCode Refactoring

schneems/rails

Dec 2024 Dec 2024
1 Month active

Languages Used

Ruby

Technical Skills

Ruby on Railsdocumentation

rails/website

Nov 2024 Nov 2024
1 Month active

Languages Used

HTML

Technical Skills

Documentation