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Markus Pettersson

PROFILE

Markus Pettersson

Worked extensively on the mullvad/mullvadvpn-app repository, delivering robust cross-platform VPN features and infrastructure over 19 months. Focused on backend development, network programming, and security, the work included implementing QUIC-enabled multihop relays, WireGuard integration, and advanced firewall management. Leveraged Rust and TypeScript to modernize APIs, automate builds, and enhance CI/CD pipelines, while maintaining rigorous test coverage and release hygiene. Addressed platform-specific challenges for Windows, macOS, and Linux, improving reliability and maintainability. Regularly upgraded dependencies, refactored code for clarity, and introduced new protocols and configuration options, resulting in a scalable, secure, and resilient VPN application with streamlined release cycles.

Overall Statistics

Feature vs Bugs

64%Features

Repository Contributions

524Total
Bugs
115
Commits
524
Features
204
Lines of code
69,786
Activity Months19

Work History

April 2026

31 Commits • 18 Features

Apr 1, 2026

April 2026 focused on delivering user-facing config improvements, architecture simplifications, security hygiene, and CI/testing readiness for mullvadvpn-app. The month produced concrete features, targeted fixes, and groundwork for cross-platform reliability and safer releases, including a new release cadence (2026.2-beta1) and expanded arch support.

March 2026

21 Commits • 13 Features

Mar 1, 2026

March 2026 monthly summary for mullvad/mullvadvpn-app focused on security hardening, architectural improvements, and test coverage enhancements. The team delivered significant features to improve relay selection, robustness across platforms, and packaging readiness while tightening security and cross-architecture build reliability.

February 2026

22 Commits • 6 Features

Feb 1, 2026

February 2026 (mullvad/mullvadvpn-app) delivered security-focused maintenance, feature toggles, and stability improvements. Key outcomes include enabling gotatun by default on macOS builds, improved daemon lifecycle for incoming connections, and comprehensive dependency hardening to address RUSTSEC advisories, alongside scalability tweaks for macOS installers and proactive documentation updates. These changes enhance security posture, developer productivity, and user experience, while preserving platform parity and release readiness.

January 2026

29 Commits • 14 Features

Jan 1, 2026

January 2026 (2026-01) summary for mullvad/mullvadvpn-app: Delivered core features enabling robust leak detection and improved safety, enhanced low-level networking, and strengthened developer tooling and release readiness. Key outcomes include a protobuf-based LeakInfo API with management interface broadcast and a non-exhaustive enum, safety hardening of unsafe code with a libc-to-nix switch, and a networking upgrade to pnet_datalink for crafted Ethernet frames. Added dev tooling improvements (tombi in devshell and zbus proxy macro), plus essential maintenance: dependency cleanup, workspace alignment for zeroize and gotatun, and release hygiene updates. Overall, this work improves observability, security, network reliability, and developer velocity, aligning technical delivery with business value.

December 2025

38 Commits • 14 Features

Dec 1, 2025

December 2025 monthly summary for mullvadvpn-app: Strengthened WireGuard port handling reliability, expanded automated testing, and improved release hygiene to deliver more robust, scalable VPN experiences. The work reduced user-reported issues around port selection, expanded test coverage, and streamlined cross‑platform release processes, yielding faster, safer software delivery.

November 2025

64 Commits • 32 Features

Nov 1, 2025

Month 2025-11: Mullvadvpn-app delivered reliability and portability improvements, improved test reliability, and strengthened CI/packaging workflows. Notable outcomes include a portable, 32-bit-compatible WireGuard handshake parser, stabilized E2E tests for GotaTun, migration of gotatun to crates, and CI/packaging improvements reducing churn and release overhead.

October 2025

34 Commits • 14 Features

Oct 1, 2025

Month: 2025-10 — Delivered release readiness enhancements, strong security hardening, and reliability improvements across Mullvad VPN Desktop. The work focused on accelerating release velocity, strengthening cross‑platform stability, and improving testability and user experience. Key outcomes include coordinated release artifacts for 2025.10 and 2025.12, security hardening with AppArmor integration, robust GotaTun integration for E2E testing, obfuscation and code-quality improvements, and rollout/user-facing safeguards.

September 2025

42 Commits • 13 Features

Sep 1, 2025

Month: 2025-09 — Mullvad VPN App (mullvadvpn-app) delivered a focused set of engineering improvements aimed at stability, maintainability, and release readiness, while clearly expanding core capabilities in a controlled, risk-mitigated way. Key actions spanned dependency upgrades, workspace consolidation, lint reliability, and documentation enhancements, with targeted changes across end-to-end testing and release-related assets.

August 2025

17 Commits • 3 Features

Aug 1, 2025

Month: 2025-08, Mullvad Mullvadvpn app monthly summary focused on delivering reliability, documentation, and CI/test stability improvements that enable a more reliable, cross-platform VPN experience and faster release cycles. Key outcomes: - QUIC-enabled multihop relay reliability improvements: refined exit relay filtering, QUIC payload sizing adjustments, and include_in_country handling; added unit tests for relay selector edge cases. Commits included: 0b3564dc6bf140b129ecdbaf26a4f94fd1ea8ee7; ec2f4c6b8a58b2f779dbfa8db6c39efc7adfea20; c4e2493eeb28a159980510bca408ca01ccdf4cd5; 6fd8a3da5cab90e66ed84683e9ee11fbfc2b031b; 53f1583cdaa2cef500018326c621b023249064b6. - QUIC obfuscation feature documentation: documented support for QUIC obfuscation, including WireGuard over QUIC, in the README feature table. Commit: b4a7623f3400a8b688cf57b2ecf4f480955a1713. - CI/Testing infrastructure and OS support improvements: CI and test workflow updates to support Debian 13, nightly compiler pin, OS version fetch fixes, and broader cross-platform stability. Commits include: 9b3324b2a2e1a22a3a85b539f39ae0fce89ca5e7; 57e41952f8d0b02d0d433c12879e7e537807cb3f; 8b7e2dba790e90a0ac885adfeded15eb97fb99f0; 1991251db2ea170408263e7c4afd6fc17c7c2d1e; 3a1ee2912176cd9fc48897301b5f57fe5d534a1d; bcf79eba1635fcf63f59d50c1712ca38385793b1; c5974302a84e4359101ba06da4ced91f664a54a1; 7b7b55e8d2879c7a2bb5579844b7119ba58dac46; 1df9c815d8e3deea665de92a6e283e94d2319403; 81361181795d27a1060ccf019ec5126dfba4c0f4; 3bb3579b2bfeeb03d15676133a3c4590de81c5dd. Overall impact and accomplishments: Strengthened core networking for end-users with more reliable QUIC multihop tunnels, clarified and exposed QUIC obfuscation capabilities, and hardened cross-platform CI/testing to reduce regressions. This supports faster, safer releases and a smoother onboarding experience for users with diverse environments. Technologies/skills demonstrated: Rust, QUIC, WireGuard over QUIC, cross-platform CI/CD (Debian 13, macOS, Windows), OS-version detection, test-driven development, and code quality improvements (reducing unsafe usage via objc2_service_management).

July 2025

31 Commits • 12 Features

Jul 1, 2025

Monthly summary for 2025-07 for mullvad/mullvadvpn-app. The team delivered notable platform enhancements, improved security policy enforcement, and targeted bug fixes that collectively improve cross-platform reliability, performance, and maintainability. Key outcomes include Windows firewall policy management with reboot persistence, a reorganized and more maintainable WinFW module, substantial QUIC enablement and tuning across desktop and backend components, IPv6 support for mullvad-masque-proxy, and ABI/dependency modernization to reduce risk. Key achievements: - Ephemeral Windows Firewall policy and reboot persistence implemented with conditional rule persistence; added end-to-end test for reboot-clearing behavior (commits 846dfb364fcbb4fdc76d6cbad1f09768d6c904c1; 5e13d7441e78d79b9f9e89c8a1dd470833723f8c; 1391bf030931ee44964702f5112e0bec5f18fea9). - QUIC support and tuning across desktop, relay selector, MTU adjustments, and UI indicators with accompanying end-to-end tests (multiple commits). - IPv6 support added to mullvad-masque-proxy (commit 9540001b411f8e60c2a7a57f1054f030202bd7f3). - talpid-openvpn compile fix to restore build reliability (commit 5fe3aa99935b49e83d0a7ad13ac13d8f2c47d38d). - Remove Pillow-related CVEs from osv-scanner.toml to mitigate vulnerability surface (commit df8d29dafbbe58f301b20bd3dcd2d581260de185).

June 2025

3 Commits

Jun 1, 2025

June 2025 monthly summary for mullvad/mullvadvpn-app: Reliability and correctness improvements across the build, test, and runtime pipeline. Key features delivered include fixes to GUI test build and asset inclusion, ensuring test files and assets are discovered with correct paths and recursive globbing; proper metadata version incrementing prior to signing to ensure the packaging metadata reflects the latest release; and a type-safety correction for musl-based Linux targets in ioctl calls (SIOCSIFMTU/SIOCGIFMTU) using the correct c_ulong type. Overall impact: reduced release risk, more deterministic CI/build behavior, and improved runtime stability on musl-based systems. Technologies/skills demonstrated: build scripting and asset management; test automation; packaging/versioning pipelines; and low-level C ioctl compatibility across glibc/musl environments.

May 2025

15 Commits • 6 Features

May 1, 2025

Month: 2025-05 — Consolidated reliability, cross-platform enhancements, and release readiness for Mullvad VPN app across macOS and Windows. Delivered Rust modernization, DNS reliability improvements, offline Windows installer support, user-facing protocol notifications, and CI/CD improvements, underpinned by updated release notes and versioning.

April 2025

17 Commits • 4 Features

Apr 1, 2025

April 2025 — Key security hardening, reliability, and UX/docs improvements for mullvadvpn-app. Security work consolidated vulnerability scanning and dependency patches (tokio upgrades to 1.44.2; suppression adjustments for GO/RUSTSEC advisories; removal of outdated suppressions), reducing noise and closing advisories. Platform-aware in-app upgrade error handling was added to avoid confusing users on unsupported platforms. CI/QA coverage expanded with Fedora 42 and Ubuntu 25.04 VMs, boosting environment realism. Release/docs alignment tightened with changelog updates and versioning to 2025.6-beta1, plus OpenVPN warnings. UX/Translations improvements and WireGuard/OpenVPN descriptions enhanced accessibility. Upgrade data mapping was refined to use only the version string when upgrades are suggested, including a new SuggestedUpgrade mapper type. Testing infrastructure gained a mullvad-version test dependency. Overall, these changes improve security posture, release readiness, user clarity, and testing reliability, enabling faster, safer releases and lower operational risk.

March 2025

23 Commits • 9 Features

Mar 1, 2025

March 2025 marked a consolidation of platform reliability, security hardening, and release-readiness for mullvadvpn-app. Delivered platform-aware build improvements, runtime fixes, and new debugging capabilities; optimized Windows test workflow with a pre-built test-manager; upgraded key dependencies and silenced CVEs; enhanced release integrity with artifact verification and versioning updates; updated translations and changelog; introduced a gRPC skeleton for mullvad-daemon and established fallback build paths to ensure resilience.

February 2025

34 Commits • 11 Features

Feb 1, 2025

February 2025 (mullvad/mullvadvpn-app) focused on security hygiene, dependency upgrades, network reliability, CI/test efficiency, and packaging/maintenance. Key deliveries included security/advisory scanning improvements, dependency upgrades, network stability enhancements, and substantial CI/test workflow optimizations, complemented by maintenance and packaging refinements.

January 2025

32 Commits • 10 Features

Jan 1, 2025

January 2025 highlights the stabilization and expansion of the MullV VPN app’s core functionality, packaging, and testing readiness. The team delivered a refined tunnel integration and improved build tooling, elevating stability and cross‑platform release readiness while strengthening the testing and release documentation.

December 2024

25 Commits • 12 Features

Dec 1, 2024

December 2024 performance snapshot for mullvadvpn-app: Delivered targeted features to improve cross‑platform reliability, tightened security posture, and strengthened release hygiene, while continuing to invest in API quality and testing practices. The work reduced deployment risk, increased maintainability, and set a trajectory for faster, safer releases.

November 2024

40 Commits • 11 Features

Nov 1, 2024

November 2024 highlights for mullvadvpn-app: stabilized CI, expanded cross‑platform support, and strengthened test infrastructure while delivering focused feature improvements that drive reliability, maintainability, and faster release cycles. Key outcomes include reduced test flakiness across quantum-resistant and multihop tunnels, improved Windows support, and modular test configuration that accelerates onboarding and automation.

October 2024

6 Commits • 2 Features

Oct 1, 2024

Month: 2024-10. Summary of work on mullvadvpn-app focused on platform parity, reliability, and test stability. Key features delivered include Android multihop enablement and WireGuard over Shadowsocks support; major bug fixes include Android set_block_when_disconnected unimplemented error and testing corrections; test/dependency updates to Cargo.lock to ensure up-to-date libraries.

Activity

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Quality Metrics

Correctness94.0%
Maintainability92.8%
Architecture91.4%
Performance89.2%
AI Usage20.4%

Skills & Technologies

Programming Languages

BashCC++DockerfileGoINIJSONJavaJavaScriptKotlin

Technical Skills

API DesignAPI DevelopmentAPI IntegrationAPI designAPI developmentAPI integrationAndroid DevelopmentAsynchronous ProgrammingBackend DevelopmentBug FixingBuild AutomationBuild ConfigurationBuild ProcessBuild ScriptingBuild System

Repositories Contributed To

1 repo

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

mullvad/mullvadvpn-app

Oct 2024 Apr 2026
19 Months active

Languages Used

MarkdownRustTypeScriptCC++GoJSONJavaScript

Technical Skills

API IntegrationBackend DevelopmentCargoDependency ManagementDocumentationEnd-to-end testing