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Federico Cappelli

PROFILE

Federico Cappelli

Francesco Cappelli engineered robust authentication, subscription, and analytics systems for the duckduckgo/apple-browsers repository, driving the migration to unified Auth V2 and modernizing subscription APIs. He implemented privacy-preserving telemetry and error handling frameworks, leveraging Swift and SwiftUI to deliver cross-platform solutions for iOS and macOS. His work included resilient token management, secure keychain integration, and advanced dependency tooling, all while maintaining rigorous test coverage and localization standards. By refactoring legacy flows, consolidating error protocols, and enhancing onboarding UX, Francesco improved platform reliability, security, and maintainability, demonstrating depth in API integration, concurrency, and privacy engineering throughout the codebase.

Overall Statistics

Feature vs Bugs

84%Features

Repository Contributions

133Total
Bugs
10
Commits
133
Features
51
Lines of code
80,584
Activity Months16

Work History

February 2026

9 Commits • 4 Features

Feb 1, 2026

February 2026 monthly summary for the duckduckgo/apple-browsers repo set focused on delivering robust dependency tooling, enhancing analytics/security, and refining onboarding UX, while hardening WebView token access. The work drove reliability, security, and measurable business value by stabilizing package management, improving token/fraud handling, and aligning localization with product branding.

January 2026

8 Commits • 3 Features

Jan 1, 2026

January 2026 (2026-01) performance summary for duckduckgo/apple-browsers: Delivered Auth V2 Adoption and Subscription API Unification across the browser surface, removing Auth V1 and Subscription V1 and consolidating authentication to Auth V2. Unified the subscription surface with consistent types and protocols, updating APIs, app code, and tests. Executed removal of legacy bridging (Auth V1<>V2), consolidated subscription flows under SubscriptionManager, and renamed APIs to unified surface to reduce maintenance burden. Strengthened platform reliability and security with a JWT-kit upgrade to 4.13.5, CSS Swift package integration, and centralized PixelKit dry-run logic to improve telemetry reliability and build stability. Enhanced Error Tracking and Reporting for subscription flows by expanding context and refining error sources, and cleaned keychain error source reporting to per-app sources for accurate telemetry. These changes deliver clearer operational insights, faster feature delivery, and a more secure, maintainable codebase across the Apple Browsers suite.

December 2025

7 Commits • 4 Features

Dec 1, 2025

December 2025 focused on delivering reliable Attributed Metric telemetry, enhancing authentication reliability, and refining pixel-based telemetry across duckduckgo/apple-browsers. The month delivered iOS/macOS pixel definitions, robust data retention and test coverage, and a streamlined migration path to Auth V2, along with improved pixel naming flexibility and subscription error reporting.

November 2025

6 Commits • 2 Features

Nov 1, 2025

Summary for November 2025 (2025-11) - duckduckgo/apple-browsers: Key features delivered: - AttributedMetric rollout across iOS and macOS with privacy-preserving bucketing, storage utilities, and cross-platform integration. The initiative renamed behavior metrics to attributed metrics, added bucket-based quantisation with version tracking, extended the metric manager and storage to support feature flags, and introduced debug assets for privacy-focused analytics. - macOS AttributedMetric integration including a new debug menu and cross-platform wiring for key triggers (Search, Ad Click, AI Chat, Subscriptions, and Sync) to emit attributed_metric_* pixels with improved scheduling and background processing. - Origin privacy gating for attributed metrics: origin parameter is now sent only for origins matching remote-configured substrings (OriginSettings), reducing data exposure while preserving useful analytics. - Auth V2 logout improvements: enhanced error reporting for missing tokens, unified keychain availability notifications, and normalized logging across storage/token flows for better diagnosability and privacy. - DDGError improvements: expanded conformance and reporting in error pixels (codes and domains preserved) with reduced exposure of raw error descriptions while maintaining actionable debugging data. Major bugs fixed / stability improvements: - Improved error handling and consistency across pixel events (DDGError integration). - Privacy-conscious fixes around origin handling and token presence reporting to prevent leakage and misfiring of pixels. - Logging and notification consistency for keychain/token operations in Auth V2 flows. Overall impact and accomplishments: - Delivered a cohesive, cross-platform analytics framework with privacy-preserving data collection across iOS and macOS, enabling richer retention/engagement insight without compromising user privacy. Debug tooling and test coverage were expanded to support faster iterations and safer releases. Technologies and skills demonstrated: - Swift-based cross-platform architecture (iOS/macOS), PixelKit integration, and privacy config-driven features. - Bucketing and versioned metrics with feature-flag controls; enhanced storage, time utilities, and test utilities. - Debug UI/menus for attributed metrics; robust error handling (DDGError) and token/keychain management (Auth V2). - Strong focus on data minimization, origin gating, and privacy-preserving analytics.

October 2025

2 Commits • 2 Features

Oct 1, 2025

October 2025 monthly summary for duckduckgo/apple-browsers. Delivered key features and improvements focused on package hygiene, attribution reliability, and testing readiness. The work accelerates downstream development and improves product quality.

September 2025

5 Commits • 2 Features

Sep 1, 2025

September 2025: Implemented standardized error handling across DuckDuckGo Apple Browsers by introducing the DDGError protocol and migrating core modules (Networking, Subscription, Malicious Site Protection, PixelKit) to DDGError. Deprecated legacy error mechanisms; improved debugging via NSError bridging and expanded test coverage. Reworked PixelKit error handling by consolidating PixelKitEventV2 into PixelKitEvent, adding reflection-based error extraction, and encoding errors as enum cases to streamline maintenance. These changes reduce cross-module error ambiguity, improve reliability, and speed incident diagnosis.

August 2025

9 Commits • 4 Features

Aug 1, 2025

Month: 2025-08 — Consolidated delivery across duckduckgo/apple-browsers with a focus on reliability, safety, and user experience. Business value delivered includes safer navigation (external redirects), robust subscription and authentication flows, and streamlined macOS UX for subscriptions.

July 2025

17 Commits • 6 Features

Jul 1, 2025

July 2025 monthly summary for duckduckgo/apple-browsers focused on delivering high-value telemetry, faster subscription flows, robust authentication, and secure token management across iOS/macOS. The team completed several end-to-end improvements with concrete business impact: telemetry accuracy, faster user restore flows, and stronger security and reliability in authentication and token handling.

June 2025

12 Commits • 3 Features

Jun 1, 2025

June 2025: Delivered key features and fixes across duckduckgo/apple-browsers that improve authentication reliability, offline subscription access, localization clarity, and test stability. The changes enhance user trust, ensure availability offline, and reduce production bugs through stronger test coverage.

May 2025

10 Commits • 5 Features

May 1, 2025

Concise monthly summary for 2025-05 for the duckduckgo/apple-browsers repository. This period focused on strengthening authentication reliability, improving token storage security, validating entitlement-driven feature availability, enhancing observability, and documenting migration paths from AuthV1 to AuthV2. Key outcomes include a hardened AuthV2 token refresh/error flow, per-bundle token storage for Network Protection, migration-safe API changes, a new Export Logs debug feature, and comprehensive AuthV2 documentation.

April 2025

12 Commits • 3 Features

Apr 1, 2025

Monthly performance summary for 2025-04 focusing on the duckduckgo/apple-browsers workstream. Delivered AuthV2 rollout with remote feature flag, migration optimization, and observability instrumentation; strengthened token and VPN System Extension resilience; and unified cross-platform subscription analytics. Improved keychain error handling, telemetry, and logs, contributing to a more reliable authentication flow and clearer analytics visibility. The work reduced startup delays, mitigated 401 issues, and enhanced decision-making with richer telemetry.

March 2025

14 Commits • 4 Features

Mar 1, 2025

March 2025 highlights delivered across duckduckgo/apple-browsers with a focus on controlled migration, reliability, and migration safety. Key features include AuthV2 rollout behind feature flags across iOS and macOS with a centralized isAuthV2Enabled flag and groundwork for the macOS authentication flow, plus cross-platform messaging between web and native components. Reliability improvements extended to subscriptions/entitlements, including robust recovery on token expiry and post-purchase/rest restart correctness. API resilience was enhanced via a standardized retry policy for AuthV2 API calls. VPN token handling and migration stability were improved with fixed storage issues and more reliable restart behavior during migrations. Finally, DBP regressions were rolled back to restore stable BrokenSiteReport behavior, ensuring consistent debugging and analytics. This work supports business value by reducing sign-in churn, stabilizing entitlement checks and recovery, enabling safer staged rollouts of AuthV2, and improving overall platform stability during migrations.

February 2025

9 Commits • 3 Features

Feb 1, 2025

February 2025 — Key progress across two DuckDuckGo browser repos focused on authentication readiness, token resilience, and reliability of subscription flows. Auth V2 groundwork in duckduckgo/apple-browsers establishes a unified token handling abstraction and bridging between AuthV1 and AuthV2, with token storage improvements and critical dependency upgrades. Added dead token recovery and enhanced token expiry handling to recover subscriptions or surface clear errors for Stripe users, strengthening long-lived session stability. Hardened Subscription API semantics by treating 404 as no subscription in addition to 400, reducing false negatives. Performed localization cleanup to remove unused strings and reduce localization overhead. In duckduckgo/macos-browser, prepared for Auth V2 adoption by upgrading BrowserServicesKit dependencies and refactoring initialization while preserving Auth V1 compatibility. Overall impact: reduces auth-related errors, accelerates migration to Auth V2, improves subscription reliability, and lowers localization maintenance costs.

January 2025

10 Commits • 5 Features

Jan 1, 2025

January 2025 highlights across the macOS and Apple Browsers repositories, delivering robustness, observability, and Authv2 readiness while stabilizing dependencies and aligning branding. The work strengthens production stability, enables faster triage, and sets a solid foundation for broader Authv2 adoption and future subscriptions enhancements.

November 2024

1 Commits • 1 Features

Nov 1, 2024

November 2024 monthly summary for duckduckgo/apple-browsers: focus on release readiness for Product Release 7.145.0, with configuration updates, CI reliability tuning, and data integrity improvements. This month laid the groundwork for a smooth production rollout while maintaining artifact traceability and test stability.

October 2024

2 Commits

Oct 1, 2024

October 2024 monthly summary for duckduckgo/apple-browsers. Focused on stabilizing VPN diagnostics by restoring the default logging level and reverting log level changes introduced during a prior refactor. No new features; improvements centered on reliability, monitoring accuracy, and maintainability.

Activity

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Quality Metrics

Correctness88.6%
Maintainability84.8%
Architecture85.4%
Performance80.0%
AI Usage30.6%

Skills & Technologies

Programming Languages

JSONJavaScriptLocalizationMarkdownObjective-CShellSwiftXMLYAML

Technical Skills

API DesignAPI DevelopmentAPI IntegrationAPI integrationActor ConcurrencyActor ModelAnalyticsAnalytics IntegrationAppKitAsynchronous ProgrammingAuthenticationAuthentication SystemsBackend DevelopmentBackend IntegrationBug Fixing

Repositories Contributed To

2 repos

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

duckduckgo/apple-browsers

Oct 2024 Feb 2026
16 Months active

Languages Used

SwiftObjective-CYAMLXMLMarkdownJSONJavaScriptShell

Technical Skills

DebuggingDependency ManagementLoggingNetwork ProtectioniOS DevelopmentmacOS Development

duckduckgo/macos-browser

Jan 2025 Feb 2025
2 Months active

Languages Used

LocalizationObjective-CSwift

Technical Skills

Code RefactoringDebuggingDependency ManagementError HandlingInternationalizationLocalization