signalapp/Signal-iOS
Oct 2024 – Oct 2025
13 Months active
Languages Used
Objective-CSwiftMakefilePythonShellYAMLprotobufXML
Technical Skills
Asynchronous ProgrammingCode OrganizationConcurrencyData EncryptionData ManagementData Serialization
Max Radermacher
PROFILE
Max Radermacher
Max contributed to the signalapp/Signal-iOS repository by engineering robust messaging, group management, and real-time communication features. He modernized core workflows by introducing async/await patterns in Swift, parallelizing message building and pre-key fetching to reduce latency, and migrating notification and messaging flows to WebSocket-based architecture. Max improved reliability through targeted refactoring, dependency upgrades, and enhanced error handling, while also streamlining registration and group operations for better user experience. His work included deep codebase maintenance, database migrations, and CI/CD tooling updates, leveraging technologies such as Swift, Objective-C, and Protocol Buffers to deliver scalable, maintainable, and secure mobile functionality.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
846Total
Bugs
183
Commits
846
Features
378
Lines of code
146,196
Activity Months13
Your Network
72 people
Work History
October 2025
41 Commits • 26 Features
Oct 1, 2025October 2025 — signalapp/Signal-iOS: Delivered stability, maintainability, and release-readiness through a mix of feature work, bug fixes, and CI/CD improvements. Key outcomes include a one-time WebP globals initialization, a crash fix for viewing all group members, modernization of CI/CD tooling with an Xcode upgrade, and a series of library upgrades (LibSignal) plus refactors to improve data handling and removal of obsolete migrations. These changes reduce startup overhead and crash risk, accelerate release cycles, and improve media handling reliability for end users.
41 Commits • 26 Features
Oct 1, 2025October 2025 — signalapp/Signal-iOS: Delivered stability, maintainability, and release-readiness through a mix of feature work, bug fixes, and CI/CD improvements. Key outcomes include a one-time WebP globals initialization, a crash fix for viewing all group members, modernization of CI/CD tooling with an Xcode upgrade, and a series of library upgrades (LibSignal) plus refactors to improve data handling and removal of obsolete migrations. These changes reduce startup overhead and crash risk, accelerate release cycles, and improve media handling reliability for end users.
October 2025
September 2025
71 Commits • 20 Features
Sep 1, 2025September 2025 performance summary for signalapp/Signal-iOS. Focused on delivering core business value through parallelized messaging, improved pre-key retrieval reliability, and robust group/registration behavior, while enabling dynamic runtime configuration via remote config. Also advanced maintainability through targeted codebase refactoring, data migrations, and dependency upgrades to reduce risk and prepare for scalable growth. Result: lower latency in message delivery, fewer registration/group-related issues, and a stronger foundation for future features and experiments.
September 2025
71 Commits • 20 Features
Sep 1, 2025September 2025 performance summary for signalapp/Signal-iOS. Focused on delivering core business value through parallelized messaging, improved pre-key retrieval reliability, and robust group/registration behavior, while enabling dynamic runtime configuration via remote config. Also advanced maintainability through targeted codebase refactoring, data migrations, and dependency upgrades to reduce risk and prepare for scalable growth. Result: lower latency in message delivery, fewer registration/group-related issues, and a stronger foundation for future features and experiments.
August 2025
44 Commits • 20 Features
Aug 1, 2025Summary for 2025-08 (signalapp/Signal-iOS): Focused on reliability, security, and performance through WebSocket-driven messaging, proxy optimization, and workflow modernization. Key features delivered include migrating token pushes, quick restore, and notification delivery to WebSocket, enforcing WebSocket usage for core paths, and removing WebSocket usage for registerBackupId; enhancing proxy usage with dynamic timeouts and WebSocket-based testing; modernizing registration and pre-key workflows by removing deprecated shims, adjusting timing, and upgrading CI/Build tooling; asyncification of components with updated documentation; and significant indexing/retry determinism improvements. Major bugs fixed included correcting the deletion flow for broken EditRecords, persisting newly-linked devices before contact sync to avoid race conditions, implementing fail-fast behavior after deregistration, deduplicating sender certificate fetches, and resolving conflicts when sending with sender keys. Overall, the work increased message delivery reliability, reduced latency and race conditions, strengthened security posture, and streamlined releases. Technologies/skills demonstrated include WebSocket architecture, advanced concurrency handling, async programming, CI/build system updates (Xcode 26), API surface cleanup (devices→deviceIds, removal of legacy DB transaction helpers), and performance optimizations.
44 Commits • 20 Features
Aug 1, 2025Summary for 2025-08 (signalapp/Signal-iOS): Focused on reliability, security, and performance through WebSocket-driven messaging, proxy optimization, and workflow modernization. Key features delivered include migrating token pushes, quick restore, and notification delivery to WebSocket, enforcing WebSocket usage for core paths, and removing WebSocket usage for registerBackupId; enhancing proxy usage with dynamic timeouts and WebSocket-based testing; modernizing registration and pre-key workflows by removing deprecated shims, adjusting timing, and upgrading CI/Build tooling; asyncification of components with updated documentation; and significant indexing/retry determinism improvements. Major bugs fixed included correcting the deletion flow for broken EditRecords, persisting newly-linked devices before contact sync to avoid race conditions, implementing fail-fast behavior after deregistration, deduplicating sender certificate fetches, and resolving conflicts when sending with sender keys. Overall, the work increased message delivery reliability, reduced latency and race conditions, strengthened security posture, and streamlined releases. Technologies/skills demonstrated include WebSocket architecture, advanced concurrency handling, async programming, CI/build system updates (Xcode 26), API surface cleanup (devices→deviceIds, removal of legacy DB transaction helpers), and performance optimizations.
August 2025
July 2025
116 Commits • 43 Features
Jul 1, 2025July 2025: Delivered substantial architectural and performance improvements for Signal-iOS with a focus on reliability, developer productivity, and user-perceived responsiveness. Key features delivered include a GroupIdentifier-based request routing and deduping for group refreshes; Xcode 26 compatibility work with testing notes and build notifications; Asyncify-enabled core flows (payments, verification, transactions, and account activity) to reduce UI latency; GIF picker enhancements with improved search/trending UX, spinners, and error handling; and config/remote config migration plus LibSignal updates to keep pace with platform changes. Major bugs fixed include identity validation on 422, improved error classification (network vs timeout), orientation handling for QR code scanners, and various warnings/error handling improvements. The combination of these changes improved reliability, reduced flaky tests, and delivered tangible business value through smoother onboarding flows, faster transactions, and more resilient network handling. Technologies/skills demonstrated include Swift concurrency (async/await), Sendable conformance, WebSocket integration, LibSignal updates, Xcode tooling, and robust timeout/error utilities.
July 2025
116 Commits • 43 Features
Jul 1, 2025July 2025: Delivered substantial architectural and performance improvements for Signal-iOS with a focus on reliability, developer productivity, and user-perceived responsiveness. Key features delivered include a GroupIdentifier-based request routing and deduping for group refreshes; Xcode 26 compatibility work with testing notes and build notifications; Asyncify-enabled core flows (payments, verification, transactions, and account activity) to reduce UI latency; GIF picker enhancements with improved search/trending UX, spinners, and error handling; and config/remote config migration plus LibSignal updates to keep pace with platform changes. Major bugs fixed include identity validation on 422, improved error classification (network vs timeout), orientation handling for QR code scanners, and various warnings/error handling improvements. The combination of these changes improved reliability, reduced flaky tests, and delivered tangible business value through smoother onboarding flows, faster transactions, and more resilient network handling. Technologies/skills demonstrated include Swift concurrency (async/await), Sendable conformance, WebSocket integration, LibSignal updates, Xcode tooling, and robust timeout/error utilities.
June 2025
82 Commits • 35 Features
Jun 1, 2025June 2025: Focused on reliability, performance, and maintainability for Signal iOS, with user-facing resilience around expiry events, robust real-time connectivity, and safer background processing. Core dependencies were upgraded to strengthen security and stability, and async patterns were expanded to improve UI responsiveness and error handling. The work delivers tangible business value through improved user trust, lower churn, and a stronger foundation for scalable features.
82 Commits • 35 Features
Jun 1, 2025June 2025: Focused on reliability, performance, and maintainability for Signal iOS, with user-facing resilience around expiry events, robust real-time connectivity, and safer background processing. Core dependencies were upgraded to strengthen security and stability, and async patterns were expanded to improve UI responsiveness and error handling. The work delivers tangible business value through improved user trust, lower churn, and a stronger foundation for scalable features.
June 2025
May 2025
77 Commits • 33 Features
May 1, 2025May 2025 – Signal-iOS: Key features delivered, bugs fixed, and business value realized. Key features delivered: - Asyncified core user/group operations to boost UI responsiveness and task parallelism (commits: c7190b5fe210239fb76192571c82b4f7757565e0; 5e7a4f0e107e213a9dbec0ad51d0a747c603d4b7; 3a6d34d73df820202e834dee887fc350da27364a). - NSE cancellation support and longer background refresh window with retries to improve sync reliability (commits: b94494c1c5d928c4e38e308b09197a3b85926c8b; 2a46bdba733dca74f8734715ca0a40707d6d76c7; 4da4b845f40a767e862bf4f15b503e21500d1df4). - LibSignal dependency updates to v0.71.0 and v0.72.x for compatibility and security (commits: 9aabc743ad5d578f6bd9a852a523d0322c60621c; 893ca9c325292ef61bb32627facc929e78c7249a; 91bd74df9f2e647f022be8eadb163404e2e8b242). - Group messaging improvements: distinguishing ACI/PNI messages, GroupIdentifier usage, support for edited group messages, and optimized enqueueing (commits: 14393b3a204302e4ae93d90a113cadbe50c91dea; 127444aad5848c1943e2e9bd1bd53360002cb5e2; 54aeb48a5e04cbbe80a85d55633f36eeddcf2023; fe58139a114e3b7bb908cd2672ede3ed45cbbfb7). - Pre-key store improvements and removal of mocks to streamline data handling and reduce test mocks (commits: 54dfffb14d3d090b92eece542e03ace64c1a984d; 80a6816b318290eb1035f087e539af745a5e2417). - Async username deletion and AddToGroupViewController refactor to improve responsiveness and maintainability (commits: e9b93deb2d64817dd8b6b7f1c9edb6262c28c426; 01570d7c09b2e2fc7365d8ac8e9f3944d351b4c0). Major bugs fixed: - Removed no-op behavior404 to clean up dead code and reduce maintenance surface (commit: 5262ce34ef62b6cca145c9e248c3748df62ea661). - Contact permission reminder case adjustments to avoid misbehavior (commit: 1e12dc04449d612d3df38a8a6088a1e342c08d78). - Message processing performance measurement fix to accurately reflect performance (commit: 13300343de99c971052ec2b04d64e73ab7ceaab4). - Removal of unused GroupsV2Error cases to simplify error handling (commit: 9c57e909680cfcbf742aca970a887d3d31ec12f8). - Receipt handling reliability improvements: isolate errors, fix waitForPendingReceipts, and ensure observers wait for app readiness (commits: 9d2cd5b96afa7fa42089a067cfd4293496119a94; 8126b6ada17c1d0127cea3d10088a0c8ddf5cdfc; 0ca63e091d10ac81fbb54a7ea2f5f6dcb7d8e9ca). - UX and stability fixes: downgrade debug assertions to warnings; fix group invites and related flows (commits: aa34312aeeaa1b13fcf7b39132071a965d22bc08; 12d9be8fb3aeda61be58cfbef84f89206767bd0b). Overall impact and accomplishments: - The month yielded tangible business value by delivering faster, more reliable user experiences, reducing dead code and maintenance burden, and strengthening observability for faster triage and iteration on core messaging workflows. Technologies/skills demonstrated: - Async programming patterns and concurrency, background processing, and task orchestration; dependency management and LibSignal updates; advanced logging/diagnostics; test infra cleanup and code hygiene; robust group/messaging engineering and feature delivery with a focus on performance and reliability.
May 2025
77 Commits • 33 Features
May 1, 2025May 2025 – Signal-iOS: Key features delivered, bugs fixed, and business value realized. Key features delivered: - Asyncified core user/group operations to boost UI responsiveness and task parallelism (commits: c7190b5fe210239fb76192571c82b4f7757565e0; 5e7a4f0e107e213a9dbec0ad51d0a747c603d4b7; 3a6d34d73df820202e834dee887fc350da27364a). - NSE cancellation support and longer background refresh window with retries to improve sync reliability (commits: b94494c1c5d928c4e38e308b09197a3b85926c8b; 2a46bdba733dca74f8734715ca0a40707d6d76c7; 4da4b845f40a767e862bf4f15b503e21500d1df4). - LibSignal dependency updates to v0.71.0 and v0.72.x for compatibility and security (commits: 9aabc743ad5d578f6bd9a852a523d0322c60621c; 893ca9c325292ef61bb32627facc929e78c7249a; 91bd74df9f2e647f022be8eadb163404e2e8b242). - Group messaging improvements: distinguishing ACI/PNI messages, GroupIdentifier usage, support for edited group messages, and optimized enqueueing (commits: 14393b3a204302e4ae93d90a113cadbe50c91dea; 127444aad5848c1943e2e9bd1bd53360002cb5e2; 54aeb48a5e04cbbe80a85d55633f36eeddcf2023; fe58139a114e3b7bb908cd2672ede3ed45cbbfb7). - Pre-key store improvements and removal of mocks to streamline data handling and reduce test mocks (commits: 54dfffb14d3d090b92eece542e03ace64c1a984d; 80a6816b318290eb1035f087e539af745a5e2417). - Async username deletion and AddToGroupViewController refactor to improve responsiveness and maintainability (commits: e9b93deb2d64817dd8b6b7f1c9edb6262c28c426; 01570d7c09b2e2fc7365d8ac8e9f3944d351b4c0). Major bugs fixed: - Removed no-op behavior404 to clean up dead code and reduce maintenance surface (commit: 5262ce34ef62b6cca145c9e248c3748df62ea661). - Contact permission reminder case adjustments to avoid misbehavior (commit: 1e12dc04449d612d3df38a8a6088a1e342c08d78). - Message processing performance measurement fix to accurately reflect performance (commit: 13300343de99c971052ec2b04d64e73ab7ceaab4). - Removal of unused GroupsV2Error cases to simplify error handling (commit: 9c57e909680cfcbf742aca970a887d3d31ec12f8). - Receipt handling reliability improvements: isolate errors, fix waitForPendingReceipts, and ensure observers wait for app readiness (commits: 9d2cd5b96afa7fa42089a067cfd4293496119a94; 8126b6ada17c1d0127cea3d10088a0c8ddf5cdfc; 0ca63e091d10ac81fbb54a7ea2f5f6dcb7d8e9ca). - UX and stability fixes: downgrade debug assertions to warnings; fix group invites and related flows (commits: aa34312aeeaa1b13fcf7b39132071a965d22bc08; 12d9be8fb3aeda61be58cfbef84f89206767bd0b). Overall impact and accomplishments: - The month yielded tangible business value by delivering faster, more reliable user experiences, reducing dead code and maintenance burden, and strengthening observability for faster triage and iteration on core messaging workflows. Technologies/skills demonstrated: - Async programming patterns and concurrency, background processing, and task orchestration; dependency management and LibSignal updates; advanced logging/diagnostics; test infra cleanup and code hygiene; robust group/messaging engineering and feature delivery with a focus on performance and reliability.
April 2025
98 Commits • 47 Features
Apr 1, 2025April 2025 — Signal-iOS delivered stability, security, and performance enhancements across core messaging, device linking, and extension workflows. The month focused on modernizing APIs, hardening key management, and improving test reliability to reduce field incidents and accelerate onboarding of new users.
98 Commits • 47 Features
Apr 1, 2025April 2025 — Signal-iOS delivered stability, security, and performance enhancements across core messaging, device linking, and extension workflows. The month focused on modernizing APIs, hardening key management, and improving test reliability to reduce field incidents and accelerate onboarding of new users.
April 2025
March 2025
91 Commits • 56 Features
Mar 1, 2025March 2025 (2025-03) monthly summary for signalapp/Signal-iOS focused on delivering business value through remote configuration resilience, performance improvements, and stability enhancements. The work this month reduced config staleness, improved message loading and UI responsiveness, and strengthened reliability across core flows while enabling maintainable growth through targeted refactors and CI improvements. Key outcomes include remote config enhancements, performance and UX optimizations, and reliability hardening that collectively shorten time-to-value for users and reduce support incidents.
March 2025
91 Commits • 56 Features
Mar 1, 2025March 2025 (2025-03) monthly summary for signalapp/Signal-iOS focused on delivering business value through remote configuration resilience, performance improvements, and stability enhancements. The work this month reduced config staleness, improved message loading and UI responsiveness, and strengthened reliability across core flows while enabling maintainable growth through targeted refactors and CI improvements. Key outcomes include remote config enhancements, performance and UX optimizations, and reliability hardening that collectively shorten time-to-value for users and reduce support incidents.
February 2025
40 Commits • 19 Features
Feb 1, 2025February 2025 monthly summary for signalapp/Signal-iOS focused on reliability, performance, and release readiness. Delivered critical Removed-user messaging enhancements with timestamping and centralized timestamp checks; improved correctness by fixing protocol version handling, legacy syncing logic, and avoiding transcript syncing for removed messages. Implemented View Once messaging enhancements and auth cleanliness to simplify processing. Advanced release readiness and performance through dependency updates and code-quality improvements. Achieved asynchronous modernization (PNI managers, PayPal auth) and resilience improvements (backoff for profile fetches). Updated release workflow (version 7.48, LibSignal 0.65.6) and introduced targeted test optimizations to shorten feedback loops. Overall, reduced overhead, improved traceability, and strengthened end-to-end reliability for the iOS client.
40 Commits • 19 Features
Feb 1, 2025February 2025 monthly summary for signalapp/Signal-iOS focused on reliability, performance, and release readiness. Delivered critical Removed-user messaging enhancements with timestamping and centralized timestamp checks; improved correctness by fixing protocol version handling, legacy syncing logic, and avoiding transcript syncing for removed messages. Implemented View Once messaging enhancements and auth cleanliness to simplify processing. Advanced release readiness and performance through dependency updates and code-quality improvements. Achieved asynchronous modernization (PNI managers, PayPal auth) and resilience improvements (backoff for profile fetches). Updated release workflow (version 7.48, LibSignal 0.65.6) and introduced targeted test optimizations to shorten feedback loops. Overall, reduced overhead, improved traceability, and strengthened end-to-end reliability for the iOS client.
February 2025
January 2025
65 Commits • 32 Features
Jan 1, 2025January 2025 (2025-01) — Signal iOS monthly summary Overview: Delivered reliability, performance, and code quality improvements across messaging and group workflows. Implemented network request cancellation, improved data integrity safeguards, and modernized the codebase while updating core dependencies and tooling to support faster, safer releases. This month’s work enhances user experience in conversations, reduces unnecessary network traffic, and strengthens group/messaging correctness with a focus on business value and maintainability. Key features delivered: - RESTNetworkManager cancellation support to abort in-flight requests - Group/messaging improvements: migrate blocked groups to dedicated storage and sort admins/groups for consistent UI - WebSocket usage optimization to reduce latency; background storage operations to improve responsiveness - Codebase simplifications and quality: remove unnecessary SwiftValues types; codegen cleanup; apply SwiftLint fixes; deepCopy improvements - Dependency and tooling updates: LibSignal upgrades (v0.65.x), release notes and translations updates; build tooling bumps to 7.43 and Xcode 16.2 Major bugs fixed: - Prevent fan-out of oversize messages - Fix SDS codegen public imports - Avoid redundant fetches in the call header - Load group call view controller synchronously - Fix warning when updating DM timer - Notify on unexpected message fan-out Overall impact and accomplishments: - Increased reliability and user experience with fewer unexpected message fan-outs and clearer group displays - Reduced network load via cancellation and optimized WebSocket usage - Improved data integrity and UI consistency; faster, safer releases through tooling and dependency updates Technologies/skills demonstrated: - Swift, SwiftLint, LibSignal integration, WebSocket usage, background tasks, storage orchestration, release engineering (Xcode 16.2), localization
January 2025
65 Commits • 32 Features
Jan 1, 2025January 2025 (2025-01) — Signal iOS monthly summary Overview: Delivered reliability, performance, and code quality improvements across messaging and group workflows. Implemented network request cancellation, improved data integrity safeguards, and modernized the codebase while updating core dependencies and tooling to support faster, safer releases. This month’s work enhances user experience in conversations, reduces unnecessary network traffic, and strengthens group/messaging correctness with a focus on business value and maintainability. Key features delivered: - RESTNetworkManager cancellation support to abort in-flight requests - Group/messaging improvements: migrate blocked groups to dedicated storage and sort admins/groups for consistent UI - WebSocket usage optimization to reduce latency; background storage operations to improve responsiveness - Codebase simplifications and quality: remove unnecessary SwiftValues types; codegen cleanup; apply SwiftLint fixes; deepCopy improvements - Dependency and tooling updates: LibSignal upgrades (v0.65.x), release notes and translations updates; build tooling bumps to 7.43 and Xcode 16.2 Major bugs fixed: - Prevent fan-out of oversize messages - Fix SDS codegen public imports - Avoid redundant fetches in the call header - Load group call view controller synchronously - Fix warning when updating DM timer - Notify on unexpected message fan-out Overall impact and accomplishments: - Increased reliability and user experience with fewer unexpected message fan-outs and clearer group displays - Reduced network load via cancellation and optimized WebSocket usage - Improved data integrity and UI consistency; faster, safer releases through tooling and dependency updates Technologies/skills demonstrated: - Swift, SwiftLint, LibSignal integration, WebSocket usage, background tasks, storage orchestration, release engineering (Xcode 16.2), localization
December 2024
37 Commits • 16 Features
Dec 1, 2024December 2024 - Signal iOS: Strengthened reliability, performance, and code quality through async enablement, concurrency safety, and modernization. Delivered asynchronous operations for responsiveness, improved phone number handling with libPhoneNumber, and security upgrades, while stabilizing UI and startup behavior. These changes reduced main-thread blocking, improved error reporting, and positioned the app for faster onboarding and robust international use.
37 Commits • 16 Features
Dec 1, 2024December 2024 - Signal iOS: Strengthened reliability, performance, and code quality through async enablement, concurrency safety, and modernization. Delivered asynchronous operations for responsiveness, improved phone number handling with libPhoneNumber, and security upgrades, while stabilizing UI and startup behavior. These changes reduced main-thread blocking, improved error reporting, and positioned the app for faster onboarding and robust international use.
December 2024
November 2024
64 Commits • 28 Features
Nov 1, 2024Month 2024-11 focused on delivering robust networking, backend alignment, and CI improvements to boost reliability, performance, and developer velocity. Notable work tightened profile-key processing, modernized async I/O and cancellation, hardened error handling, and updated data models to align with GSEs, while upgrading CI to macOS 15 for reproducible builds. These changes reduce latency, improve user experience in messaging flows, and provide a solid foundation for upcoming features.
November 2024
64 Commits • 28 Features
Nov 1, 2024Month 2024-11 focused on delivering robust networking, backend alignment, and CI improvements to boost reliability, performance, and developer velocity. Notable work tightened profile-key processing, modernized async I/O and cancellation, hardened error handling, and updated data models to align with GSEs, while upgrading CI to macOS 15 for reproducible builds. These changes reduce latency, improve user experience in messaging flows, and provide a solid foundation for upcoming features.
October 2024
20 Commits • 3 Features
Oct 1, 2024October 2024: Delivery-focused modernization across payments, storage, and messaging subsystems for signalapp/Signal-iOS, coupled with targeted cleanup of error handling and job tooling. The work reduced legacy complexity, improved async flows, and laid groundwork for scalable growth in concurrency and reliability.
20 Commits • 3 Features
Oct 1, 2024October 2024: Delivery-focused modernization across payments, storage, and messaging subsystems for signalapp/Signal-iOS, coupled with targeted cleanup of error handling and job tooling. The work reduced legacy complexity, improved async flows, and laid groundwork for scalable growth in concurrency and reliability.
October 2024
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Quality Metrics
Correctness91.0%
Maintainability90.8%
Architecture87.6%
Performance85.4%
AI Usage20.6%
Skills & Technologies
Programming Languages
MakefileObjective-CPDFPlain TextProtoPythonRubySQLShellStrings
Technical Skills
API DesignAPI IntegrationASWebAuthenticationSessionAVFoundationAccount ManagementActorAnimationApp Lifecycle ManagementApp Store DeploymentApp Store OptimizationApple PayApple Pay IntegrationApplication Lifecycle ManagementAsset ManagementAsync/Await
Repositories Contributed To
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