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Key Responsibilities and Required Skills for Xamarin Developer

💰 $ - $

Software DevelopmentMobileXamarin

🎯 Role Definition

We are seeking a results-driven Xamarin Developer responsible for designing, developing, testing, and delivering high-quality cross-platform mobile applications using Xamarin (Xamarin.Forms and Xamarin.Native) and modern .NET tooling. The ideal candidate combines strong C#/.NET skills, mobile UX awareness, and practical experience deploying apps to the Apple App Store and Google Play Store. This role collaborates with product managers, designers, backend engineers, QA, and DevOps to ship performant, secure, and maintainable mobile solutions for iOS and Android.

📈 Career Progression

Typical Career Path

Entry Point From:

  • Junior Mobile Developer (Xamarin, iOS, or Android)
  • .NET / C# Developer transitioning to mobile
  • Software Engineer with cross-platform experience

Advancement To:

  • Senior Xamarin Developer / Lead Mobile Engineer
  • Mobile Architect or Principal Engineer (Mobile)
  • Engineering Manager or Head of Mobile

Lateral Moves:

  • Native iOS Developer (Swift/Objective-C)
  • Native Android Developer (Kotlin/Java)
  • .NET Backend Developer or Full-Stack .NET Engineer

Core Responsibilities

Primary Functions

  • Architect, design, and implement reusable, testable, and maintainable cross-platform mobile applications using Xamarin.Forms, Xamarin.Android, Xamarin.iOS, and .NET (including .NET MAUI where applicable).
  • Translate product requirements and UX designs into robust mobile features with clean, modular code following MVVM or other proven design patterns.
  • Integrate mobile applications with RESTful APIs, GraphQL endpoints, OAuth2/OpenID Connect authentication flows, and third-party SDKs (analytics, payments, maps).
  • Implement platform-specific features (camera, geolocation, push notifications, background services) while maintaining a consistent cross-platform codebase.
  • Lead and participate in code reviews to enforce best practices, consistency, and code quality across the mobile codebase.
  • Build automated unit, integration, and UI tests (NUnit, xUnit, Xamarin.UITest, Appium) to ensure stability and reduce regression risk.
  • Profile and optimize application performance and memory usage on iOS and Android devices using platform diagnostics and profiling tools.
  • Implement secure data storage and secure networking (TLS, certificate pinning, encrypted local databases, secure key/value storage) to protect user data and comply with privacy regulations.
  • Manage the end-to-end mobile release process, including provisioning profiles, certificates, Play Console / App Store Connect setup, and beta distribution (TestFlight, Firebase App Distribution).
  • Collaborate with backend engineers to design efficient data synchronization, offline-first strategies, caching, and conflict resolution.
  • Build and maintain cross-platform UI with pixel-perfect implementations, responsive layouts, and adaptive UI for various screen sizes and resolutions using XAML and platform renderers.
  • Implement dependency injection, modular architecture, and feature toggles to simplify testing, A/B experiments, and incremental feature rollout.
  • Maintain CI/CD pipelines for mobile builds, automated testing, and deployment using Azure DevOps, GitHub Actions, Bitrise, or Jenkins.
  • Monitor crash reporting and analytics (App Center, Firebase Crashlytics, Sentry) and drive continuous improvements based on telemetry and user feedback.
  • Mentor junior developers and support professional development by sharing best practices, coding standards, and mobile architecture guidance.
  • Research and evaluate new mobile frameworks, libraries, and platform updates (Xamarin updates, .NET releases, Apple/Google platform changes) to improve development velocity.
  • Estimate feature effort, plan sprints, and contribute to product planning sessions with actionable technical input and risk assessments.
  • Create and maintain technical documentation, architecture diagrams, and onboarding guides for mobile projects.
  • Troubleshoot complex production issues across platforms, reproduce bugs locally, and provide timely hotfixes and patches.
  • Ensure compliance with accessibility standards (WCAG) and platform-specific accessibility features (VoiceOver, TalkBack).
  • Collaborate with UX designers to implement animations and transitions that enhance the user experience while keeping performance and battery consumption in mind.
  • Participate in security reviews and threat modeling for mobile features, applying secure coding practices and third-party dependency management.

Secondary Functions

  • Support product analytics and instrumentation efforts by implementing events, user property captures, and funnels to inform product decisions.
  • Assist QA with reproducible test cases, environment setup, and troubleshooting of intermittent mobile issues.
  • Contribute to cross-team technical initiatives such as mobile SDKs, shared component libraries, and internal tooling.
  • Help define mobile KPIs (crash-free users, startup time, first meaningful paint) and report on trends to engineering and product leadership.
  • Engage with customer support to triage and prioritize critical production defects and provide technical guidance for workarounds.

Required Skills & Competencies

Hard Skills (Technical)

  • Expert-level C# and strong command of the .NET ecosystem (including .NET Standard and .NET 6/7+).
  • Deep experience with Xamarin.Forms, Xamarin.Android, and Xamarin.iOS; familiarity with .NET MAUI is a plus.
  • Proven experience implementing MVVM architecture, data binding, and clean architecture patterns in mobile apps.
  • Proficiency in XAML for UI composition and custom renderers/handlers for platform-specific customization.
  • Strong experience integrating with RESTful APIs, WebSockets, and handling serialization (JSON, Protobuf).
  • Knowledge of mobile persistence solutions: SQLite, Realm, secure keychain/keystore, and encrypted local storage.
  • Experience with CI/CD for mobile: Azure DevOps, GitHub Actions, Bitrise, App Center, or Jenkins.
  • Familiarity with unit testing (NUnit/xUnit), UI testing (Xamarin.UITest, Appium), and mocking frameworks.
  • Experience with performance profiling and memory leak detection tools for both Android and iOS.
  • Proven track record publishing and maintaining apps on Apple App Store and Google Play Store.
  • Proficient with source control and branching strategies using Git (GitFlow, trunk-based development).
  • Experience with OAuth2/OpenID Connect, token refresh, and secure token storage strategies.
  • Experience with push notification systems (Firebase Cloud Messaging, Apple Push Notification Service).
  • Familiarity with cloud services and mobile-friendly backend systems (Azure Mobile Apps, Azure Functions, AWS Amplify, Firebase).
  • Knowledge of dependency injection containers (Autofac, Microsoft.Extensions.DependencyInjection) and modularization.
  • Experience with feature flagging, telemetry, and analytics platforms (App Center, Firebase, Mixpanel).
  • Understanding of accessibility, localization, and internationalization practices for mobile apps.
  • Familiarity with containerized CI builds and build caching to speed up mobile pipelines.

(At least 10 of the technical skills above are required for top candidates.)

Soft Skills

  • Strong problem-solving and diagnostic skills with a pragmatic approach to high-quality delivery.
  • Excellent communication and collaboration skills to work across product, design, QA, and backend teams.
  • Ability to estimate tasks, prioritize work, and deliver to deadlines in an Agile environment.
  • Mentorship mindset and willingness to share knowledge and elevate team capabilities.
  • Customer-focused mindset with the ability to translate business needs into technical solutions.
  • Adaptability to evolving platform requirements and willingness to learn new mobile technologies quickly.
  • Proactive ownership and accountability for features through to production and post-release support.
  • Attention to detail and commitment to maintainable, testable, and well-documented code.

Education & Experience

Educational Background

Minimum Education:

  • Bachelor's degree in Computer Science, Software Engineering, Information Systems, or equivalent practical experience.

Preferred Education:

  • Master's degree in a related field or relevant professional certifications (Microsoft Certified: .NET, Xamarin / MAUI-specific training).
  • Industry training or bootcamps demonstrating focused mobile development experience.

Relevant Fields of Study:

  • Computer Science
  • Software Engineering
  • Mobile Computing / Mobile Applications
  • Human-Computer Interaction (HCI)
  • Information Systems

Experience Requirements

Typical Experience Range:

  • 2–5+ years of professional mobile development experience, with at least 2 years building cross-platform apps using Xamarin or similar frameworks.

Preferred:

  • 4–7+ years of software engineering experience with a strong portfolio of shipped mobile applications on iOS and Android; demonstrated ownership of end-to-end mobile features including backend integration, testing, and app store release cycles.
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