mullvad/mullvadvpn-app
Nov 2024 – Oct 2025
12 Months active
Languages Used
SwiftBashGitMarkdownObjective-CShellYAMLXML
Technical Skills
Code LintingCode RenamingMVVMMobile DevelopmentObservableObjectRefactoring
Andrew Bulhak
PROFILE
Andrew Bulhak
Andrew Bulhak developed and enhanced core features for the mullvad/mullvadvpn-app, focusing on secure network protocols, robust UI flows, and cross-platform maintainability. He implemented obfuscation controls, QUIC protocol support, and dynamic feature flags, using Swift, Rust, and SwiftUI to bridge native and systems-level code. His work included refactoring data models for future extensibility, improving localization and accessibility, and stabilizing CI/CD pipelines. By consolidating API integration and memory management across Rust-Swift boundaries, Andrew improved reliability and reduced maintenance risk. His engineering approach emphasized modular UI, type safety, and test-driven development, resulting in a scalable, user-focused VPN application.
Overall Statistics
Feature vs Bugs
89%Features
Repository Contributions
90Total
Bugs
4
Commits
90
Features
33
Lines of code
7,018
Activity Months12
Your Network
48 people
Work History
October 2025
7 Commits • 2 Features
Oct 1, 2025Month 2025-10 — Mullvadvpn-app delivered two key features centered on user experience and secure lifecycle management, delivering concrete business value through safer account handling, improved UI clarity, and stronger maintainability. Key work reduced risk of data loss, enhanced visual hierarchy in the ConnectionView, and tightened token management around account setup/deletion. Overall impact includes improved user experience, reduced support risk, and a more robust codebase.
7 Commits • 2 Features
Oct 1, 2025Month 2025-10 — Mullvadvpn-app delivered two key features centered on user experience and secure lifecycle management, delivering concrete business value through safer account handling, improved UI clarity, and stronger maintainability. Key work reduced risk of data loss, enhanced visual hierarchy in the ConnectionView, and tightened token management around account setup/deletion. Overall impact includes improved user experience, reduced support risk, and a more robust codebase.
October 2025
September 2025
5 Commits • 2 Features
Sep 1, 2025September 2025: Delivered UI layout refinements and typography fixes in mullvadvpn-app to align with the new design spec, stabilized activity indicator behavior across layouts, and improved onboarding consistency. These changes enhance first-run usability, visual consistency, and status feedback reliability, supporting higher user satisfaction and reduced onboarding friction.
September 2025
5 Commits • 2 Features
Sep 1, 2025September 2025: Delivered UI layout refinements and typography fixes in mullvadvpn-app to align with the new design spec, stabilized activity indicator behavior across layouts, and improved onboarding consistency. These changes enhance first-run usability, visual consistency, and status feedback reliability, supporting higher user satisfaction and reduced onboarding friction.
August 2025
6 Commits • 4 Features
Aug 1, 2025August 2025 (2025-08) performance summary for mullvadvpn-app: Architectural consolidation of access methods, UI improvements, and targeted code-quality enhancements delivered to improve maintainability, reliability, and user experience. The work enables centralized updates, clearer configuration, and smoother user interactions, while laying groundwork for scalable future features.
6 Commits • 4 Features
Aug 1, 2025August 2025 (2025-08) performance summary for mullvadvpn-app: Architectural consolidation of access methods, UI improvements, and targeted code-quality enhancements delivered to improve maintainability, reliability, and user experience. The work enables centralized updates, clearer configuration, and smoother user interactions, while laying groundwork for scalable future features.
August 2025
July 2025
5 Commits • 3 Features
Jul 1, 2025July 2025 — Mullvadvpn-app: Strengthened Rust-Swift interop, improved UI, and tightened API robustness. Key features delivered include: 1) Rust-Swift interop and access-method synchronization with memory-management refinements for callbacks and a notification system when access methods change (commits: 6210557bbb92934be1e0697a2129642ef95c5dd3; f73c97b7d39c054d7c00460fe18870212865f453; 63cb6f5a0b27d6d54769e8afb98ed291254d1123); 2) Settings UI improvement: reduced vertical spacing above the page indicator for better multi-page layout (commit adcf1e624c4f07d8b81e758f84c718b5b14e4b14); 3) API context error handling and code organization: migrated error handling to Swift's Error enum and reorganized PersistentProxyConfiguration for better structure (commit ab927b72ac7337ccc048057954bb2858370a907f). Major bugs fixed include corrected callback pointer passing and saving of methods, memory/notification handling improvements for access method changes, and removal of redundant Sync conformance for ForeignPtr. Overall impact: improved reliability, reduced memory risk, and smoother cross-language flows, enabling faster iteration and a better user experience. Technologies demonstrated: Rust-Swift interop, memory management for callbacks, idiomatic Swift error handling, UI layout tuning, and project-wide code organization.
July 2025
5 Commits • 3 Features
Jul 1, 2025July 2025 — Mullvadvpn-app: Strengthened Rust-Swift interop, improved UI, and tightened API robustness. Key features delivered include: 1) Rust-Swift interop and access-method synchronization with memory-management refinements for callbacks and a notification system when access methods change (commits: 6210557bbb92934be1e0697a2129642ef95c5dd3; f73c97b7d39c054d7c00460fe18870212865f453; 63cb6f5a0b27d6d54769e8afb98ed291254d1123); 2) Settings UI improvement: reduced vertical spacing above the page indicator for better multi-page layout (commit adcf1e624c4f07d8b81e758f84c718b5b14e4b14); 3) API context error handling and code organization: migrated error handling to Swift's Error enum and reorganized PersistentProxyConfiguration for better structure (commit ab927b72ac7337ccc048057954bb2858370a907f). Major bugs fixed include corrected callback pointer passing and saving of methods, memory/notification handling improvements for access method changes, and removal of redundant Sync conformance for ForeignPtr. Overall impact: improved reliability, reduced memory risk, and smoother cross-language flows, enabling faster iteration and a better user experience. Technologies demonstrated: Rust-Swift interop, memory management for callbacks, idiomatic Swift error handling, UI layout tuning, and project-wide code organization.
June 2025
4 Commits • 2 Features
Jun 1, 2025Month: 2025-06 Concise monthly summary focusing on key accomplishments for mullvad/mullvadvpn-app. 1) Key features delivered: - Access method names localization: Implemented UI-wide localization of display names for access methods (Direct, Mullvad bridges, Encrypted DNS proxy) and API method names. This includes moving localization logic to the UI layer (NSLocalizedString) and clarifying behavior for persisted names at creation time. - Commits: dfcd758715f13421d94588974639cb81dd3ea2d5; 4e875e17c928f28a88c783a0d7b983c5d9a0c1dc; 7ca73df4050050573be2ad1d1398dbc1cbb96aa4 - ServerRelay feature enhancements: Introduced new QUIC and Masque fields in the ServerRelay model and added a nested Features structure. Refactored DAITA flag logic into Features, and updated mock data and tests to support the new fields. - Commit: 6abe9daec6327e0961fc3f7291f51a4ba6bf22a5 2) Major bugs fixed: - No explicit major bug fixes documented this month. 3) Overall impact and accomplishments: - Established a robust localization approach and UI-layer ownership for method names, enabling multi-language support and clearer user-facing translations. - Expanded ServerRelay data model to support future feature flags and protocol enhancements (QUIC/Masque), setting the stage for faster feature rollout and easier testing. - Improved testability and regression safety by updating mocks and tests to align with the new data structures. 4) Technologies/skills demonstrated: - iOS/macOS localization patterns (NSLocalizedString), UI-layer localization strategy, and creation-time persistence semantics. - Data model evolution with nested Features structures and protocol-related feature flags. - Test-driven approach with mocks updated to reflect structural changes, improving CI reliability. Business value: - Reduced localization maintenance cost, accelerated multi-language support, and prepared the codebase for upcoming protocol enhancements, enabling broader market reach and quicker feature delivery.
4 Commits • 2 Features
Jun 1, 2025Month: 2025-06 Concise monthly summary focusing on key accomplishments for mullvad/mullvadvpn-app. 1) Key features delivered: - Access method names localization: Implemented UI-wide localization of display names for access methods (Direct, Mullvad bridges, Encrypted DNS proxy) and API method names. This includes moving localization logic to the UI layer (NSLocalizedString) and clarifying behavior for persisted names at creation time. - Commits: dfcd758715f13421d94588974639cb81dd3ea2d5; 4e875e17c928f28a88c783a0d7b983c5d9a0c1dc; 7ca73df4050050573be2ad1d1398dbc1cbb96aa4 - ServerRelay feature enhancements: Introduced new QUIC and Masque fields in the ServerRelay model and added a nested Features structure. Refactored DAITA flag logic into Features, and updated mock data and tests to support the new fields. - Commit: 6abe9daec6327e0961fc3f7291f51a4ba6bf22a5 2) Major bugs fixed: - No explicit major bug fixes documented this month. 3) Overall impact and accomplishments: - Established a robust localization approach and UI-layer ownership for method names, enabling multi-language support and clearer user-facing translations. - Expanded ServerRelay data model to support future feature flags and protocol enhancements (QUIC/Masque), setting the stage for faster feature rollout and easier testing. - Improved testability and regression safety by updating mocks and tests to align with the new data structures. 4) Technologies/skills demonstrated: - iOS/macOS localization patterns (NSLocalizedString), UI-layer localization strategy, and creation-time persistence semantics. - Data model evolution with nested Features structures and protocol-related feature flags. - Test-driven approach with mocks updated to reflect structural changes, improving CI reliability. Business value: - Reduced localization maintenance cost, accelerated multi-language support, and prepared the codebase for upcoming protocol enhancements, enabling broader market reach and quicker feature delivery.
June 2025
May 2025
8 Commits • 3 Features
May 1, 2025May 2025 monthly summary for mullvad/mullvadvpn-app focusing on delivering robust network features, UI polish, and CI reliability improvements that collectively increase connectivity reliability, user satisfaction, and developer velocity.
May 2025
8 Commits • 3 Features
May 1, 2025May 2025 monthly summary for mullvad/mullvadvpn-app focusing on delivering robust network features, UI polish, and CI reliability improvements that collectively increase connectivity reliability, user satisfaction, and developer velocity.
April 2025
11 Commits • 4 Features
Apr 1, 2025Monthly summary for 2025-04 focusing on Mullvad Mullvadvpn app development. Delivered significant enhancements to obfuscation and QUIC support, improved tunnel-state visibility, and polished UI, while strengthening build interoperability. These efforts improved security resilience, user experience, and developer efficiency, enabling faster delivery of robust features in future cycles.
11 Commits • 4 Features
Apr 1, 2025Monthly summary for 2025-04 focusing on Mullvad Mullvadvpn app development. Delivered significant enhancements to obfuscation and QUIC support, improved tunnel-state visibility, and polished UI, while strengthening build interoperability. These efforts improved security resilience, user experience, and developer efficiency, enabling faster delivery of robust features in future cycles.
April 2025
March 2025
3 Commits • 3 Features
Mar 1, 2025March 2025 – Mullvadvpn-app: Implemented three substantive UI/asset and state-management improvements that enhance scalability, clarity, and feature discoverability. No explicit bugs fixed in this scope. Key changes include a reusable SVG-based Vector Image Asset System with centralized image access, decoupled DNS UI visibility from content blockers, and dynamic Multihop feature visibility driven by user settings or tunnel state. These efforts reduce asset maintenance, simplify UI state management, and lay groundwork for future UI refreshes and scalability.
March 2025
3 Commits • 3 Features
Mar 1, 2025March 2025 – Mullvadvpn-app: Implemented three substantive UI/asset and state-management improvements that enhance scalability, clarity, and feature discoverability. No explicit bugs fixed in this scope. Key changes include a reusable SVG-based Vector Image Asset System with centralized image access, decoupled DNS UI visibility from content blockers, and dynamic Multihop feature visibility driven by user settings or tunnel state. These efforts reduce asset maintenance, simplify UI state management, and lay groundwork for future UI refreshes and scalability.
February 2025
12 Commits • 3 Features
Feb 1, 2025February 2025 for mullvad/mullvadvpn-app focused on stabilizing WireGuard integration and delivering UI refinements with stronger CI/CD reliability. Key changes include migrating WireGuard integration from a remote package to a submodule (wireguard-apple), updating CI/CD workflows to checkout the submodule consistently, and enhancing the iOS UI/UX for VPN settings. Also updated the DAITA feature text to front-load warnings and refined markdown rendering for better visibility. These efforts improve maintainability, build reliability, and user clarity, enabling faster future iterations and a cleaner onboarding experience for users.
12 Commits • 3 Features
Feb 1, 2025February 2025 for mullvad/mullvadvpn-app focused on stabilizing WireGuard integration and delivering UI refinements with stronger CI/CD reliability. Key changes include migrating WireGuard integration from a remote package to a submodule (wireguard-apple), updating CI/CD workflows to checkout the submodule consistently, and enhancing the iOS UI/UX for VPN settings. Also updated the DAITA feature text to front-load warnings and refined markdown rendering for better visibility. These efforts improve maintainability, build reliability, and user clarity, enabling faster future iterations and a cleaner onboarding experience for users.
February 2025
January 2025
5 Commits • 2 Features
Jan 1, 2025Month: 2025-01 — Mullvad Mullvadvpn-app performance and reliability improvements focused on connection management UX, data integrity, and UI polish. Key features delivered: - Connection Management Improvements: refactored ConnectionView into modular components, enhanced relay selection display, and introduced LocationIdentifier for relay locations to improve data integrity. Commits illustrating the work: 3b90cc8957ac8fc749dafac2f3338e3d8dcda0cd (Split ConnectionView, improve previews, attempt animation); 2a17914bf9db3ffd41badc112aafcfa2c1f7d98e (Put custom list name or (unfmtd) location name into connect button); 4fb7eef8b864455c595378230e3490d1fd490256 (Change AnyRelay Location from a String to a custom type). - UI Notification Bar Consistency: removed system notification bar on relevant screens to reduce UI noise and improve user focus. Commits: 60f11bba60e82aa658c734dc070092e7d338a788 (Configure device management screen to hide notification bar); 0fdc5eca0bc0f2803b8833b7bbb1f3791be6915a (Hide notification bar in out of time screen as well). Major bugs fixed: - UI overlay issues and inconsistent system bar behavior addressed by hiding the system notification bar on DeviceManagementViewController and OutOfTime screens, improving screen focus and predictability of UI state. Overall impact and accomplishments: - Substantial improvement to user experience during connection setup with modular, maintainable UI components and more reliable relay location handling. - Clear business value from reduced UI noise, consistent screens, and safer data handling for relay locations, enabling faster iteration and easier onboarding for new engineers. Technologies/skills demonstrated: - iOS UI architecture and componentization (Swift/Storyboard or SwiftUI implied), modular refactoring of ConnectionView, data modeling enhancements with LocationIdentifier, and type-safe relocation data for AnyRelay. - End-to-end traceability through commit messages, enabling easier code reviews and audits.
January 2025
5 Commits • 2 Features
Jan 1, 2025Month: 2025-01 — Mullvad Mullvadvpn-app performance and reliability improvements focused on connection management UX, data integrity, and UI polish. Key features delivered: - Connection Management Improvements: refactored ConnectionView into modular components, enhanced relay selection display, and introduced LocationIdentifier for relay locations to improve data integrity. Commits illustrating the work: 3b90cc8957ac8fc749dafac2f3338e3d8dcda0cd (Split ConnectionView, improve previews, attempt animation); 2a17914bf9db3ffd41badc112aafcfa2c1f7d98e (Put custom list name or (unfmtd) location name into connect button); 4fb7eef8b864455c595378230e3490d1fd490256 (Change AnyRelay Location from a String to a custom type). - UI Notification Bar Consistency: removed system notification bar on relevant screens to reduce UI noise and improve user focus. Commits: 60f11bba60e82aa658c734dc070092e7d338a788 (Configure device management screen to hide notification bar); 0fdc5eca0bc0f2803b8833b7bbb1f3791be6915a (Hide notification bar in out of time screen as well). Major bugs fixed: - UI overlay issues and inconsistent system bar behavior addressed by hiding the system notification bar on DeviceManagementViewController and OutOfTime screens, improving screen focus and predictability of UI state. Overall impact and accomplishments: - Substantial improvement to user experience during connection setup with modular, maintainable UI components and more reliable relay location handling. - Clear business value from reduced UI noise, consistent screens, and safer data handling for relay locations, enabling faster iteration and easier onboarding for new engineers. Technologies/skills demonstrated: - iOS UI architecture and componentization (Swift/Storyboard or SwiftUI implied), modular refactoring of ConnectionView, data modeling enhancements with LocationIdentifier, and type-safe relocation data for AnyRelay. - End-to-end traceability through commit messages, enabling easier code reviews and audits.
December 2024
10 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for mullvadvpn-app focused on accessibility, UI reliability, and testing improvements. Delivered a major Accessibility Identifier System Overhaul with port selector accessibility improvements, and updated WireGuard obfuscation UI alongside expanded test coverage. These changes enhance usability, reduce maintenance risk, and strengthen regression safety in preparation for broader user adoption.
10 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for mullvadvpn-app focused on accessibility, UI reliability, and testing improvements. Delivered a major Accessibility Identifier System Overhaul with port selector accessibility improvements, and updated WireGuard obfuscation UI alongside expanded test coverage. These changes enhance usability, reduce maintenance risk, and strengthen regression safety in preparation for broader user adoption.
December 2024
November 2024
14 Commits • 3 Features
Nov 1, 2024November 2024 (mullvad/mullvadvpn-app): Delivered user-facing obfuscation controls and stability improvements that strengthen security posture and reduce maintenance risk. Implemented UDP-over-TCP obfuscation settings with a new SwiftUI UI for port selection, mutable settings state, a dedicated ViewModel, and integration into the VPN settings flow. Renamed the setting to udpOverTcp, removed legacy UDP port UI, and ensured coherence with the overall settings architecture. Added Shadowsocks obfuscation settings with its own UI and ViewModel, including automatic vs. custom port selection with validation. Fixed a critical robustness bug in SingleChoiceList to preserve user input when clearing a custom value. Refactored localization handling for SingleChoiceList to client-side, enabling better localization flexibility. Performed UI polish and code quality improvements including SwiftLint directive adjustments and re-enablement of checks to raise maintainability and developer velocity. These efforts collectively improve user control over obfuscation features, reduce risk in configuration flows, and demonstrate strong SwiftUI, MVVM, and lint discipline.
November 2024
14 Commits • 3 Features
Nov 1, 2024November 2024 (mullvad/mullvadvpn-app): Delivered user-facing obfuscation controls and stability improvements that strengthen security posture and reduce maintenance risk. Implemented UDP-over-TCP obfuscation settings with a new SwiftUI UI for port selection, mutable settings state, a dedicated ViewModel, and integration into the VPN settings flow. Renamed the setting to udpOverTcp, removed legacy UDP port UI, and ensured coherence with the overall settings architecture. Added Shadowsocks obfuscation settings with its own UI and ViewModel, including automatic vs. custom port selection with validation. Fixed a critical robustness bug in SingleChoiceList to preserve user input when clearing a custom value. Refactored localization handling for SingleChoiceList to client-side, enabling better localization flexibility. Performed UI polish and code quality improvements including SwiftLint directive adjustments and re-enablement of checks to raise maintainability and developer velocity. These efforts collectively improve user control over obfuscation features, reduce risk in configuration flows, and demonstrate strong SwiftUI, MVVM, and lint discipline.
Activity
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Quality Metrics
Correctness92.6%
Maintainability93.0%
Architecture89.2%
Performance88.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
BashCGitMarkdownObjective-CRustShellSwiftTOMLXML
Technical Skills
API DesignAPI DevelopmentAPI IntegrationAccessibilityAsset ManagementAuto LayoutBuild AutomationBuild System ConfigurationC/C++ InteroperabilityCI/CDCallback MechanismsCell ManagementCode LintingCode OrganizationCode Refactoring
Repositories Contributed To
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