Senior Mobile Developer

United States Digital Space LLC; Singapore; On-site; SGD 180,000 - 240,000; Full time

Job summary

United States Digital Space LLC is seeking a Senior Mobile Developer with deep .NET MAUI experience to build cross‑platform apps for Android and iOS from a single codebase. You will work with product, UX, and backend teams to deliver production-grade experiences, mentor juniors, and shape architecture decisions.

The role emphasizes MVVM, Clean Architecture, SOLID principles, and robust testing while advancing CI/CD practices across the organization.

Qualifications

• 8+ years of professional software development with C# and .NET.
• 5+ years with .NET MAUI or Xamarin.Forms and MAUI migration experience.
• Experience consuming RESTful and/or GraphQL APIs.
• Strong knowledge of dependency injection, asynchronous programming (async/await), and reactive patterns.
• Familiarity with Git-based workflows and pull requests.
• Excellent written and verbal communication skills.
• Bachelor's or Master's in Computer Science, Software Engineering, or related field.

Responsibilities

• Design, develop, and maintain cross-platform mobile apps using .NET MAUI for Android and iOS.
• Architect scalable solutions following MVVM, Clean Architecture, and SOLID principles.
• Implement native platform integrations and custom renderers/handlers as needed.
• Collaborate with UX designers and backend engineers to deliver production-grade apps.
• Mentor junior developers and participate in Agile ceremonies.
• Maintain CI/CD pipelines for automated building, testing, and deployment.

Skills

C#

.NET MAUI

Xamarin.Forms

REST/GraphQL APIs

Git workflows

Async programming

MVVM

Unit testing

CI/CD

Performance tuning

Education

Bachelor's or Master's in Computer Science or related field

Tools

Visual Studio 2022

VS Code

JetBrains Rider

Azure DevOps

GitHub Actions

App Center

Job description

Role Summary

Our client is seeking a talented and experienced Senior Mobile Developer specialising in .NET MAUI to join our cross‑platform mobile development team.

In this role, you will design, build, and maintain high-performance applications that run seamlessly on Android, iOS, from a single shared codebase. You will work closely with product managers, UX designers, and backend engineers to deliver polished, production‑grade experiences to our users. You will also mentor junior developers, contribute to architectural decisions, and champion engineering best practices across the organisation.

Main Responsibilities

• Design, develop, and maintain cross‑platform applications using .NET MAUI targeting Android, iOS.
• Architect scalable, maintainable solutions following MVVM, Clean Architecture, and SOLID principles.
• Implement native platform integrations and custom renderers/handlers where platform‑specific behaviour is required.
• Proficiency with platform‑specific APIs on Android (Java/Kotlin interop) and iOS (Swift/Obj‑C interop).
• Collaborate with UX/UI designers to translate wireframes and mockups into responsive, accessible user interfaces.
• Integrate RESTful APIs and backend services with robust error handling.
• Write comprehensive unit tests, integration tests, and UI tests using xUnit, NUnit, or MSTest along with Appium or similar frameworks.
• Optimise application performance including startup time, memory usage, rendering, and battery consumption.
• Conduct code reviews, provide constructive feedback, and mentor junior and mid‑level engineers.
• Participate in Agile ceremonies (sprint planning, stand‑ups, retrospectives) and contribute to continuous improvement initiatives.
• Stay current with .NET MAUI releases, Xamarin migration paths, and the broader .NET ecosystem.
• Maintain CI/CD pipelines for automated building, testing, and deployment of mobile applications.

Qualifications & Experience

• Bachelor's or Master's in Computer Science, Software Engineering, or a related field (or equivalent practical experience).
• More than 8 years of professional software development experience with C# and the .NET ecosystem.
• More than 5 years of hands‑on experience with .NET MAUI or Xamarin.Forms (with demonstrated MAUI migration expertise).
• Proficiency with platform‑specific APIs on Android (Java/Kotlin interop) and iOS (Swift/Obj‑C interop).
• Experience consuming and integrating RESTful and/or GraphQL APIs. Solid knowledge of dependency injection, asynchronous programming (async/await), and reactive patterns.
• Familiarity with Git‑based workflows, pull request culture, and branch strategies (GitFlow, trunk‑based).
• Strong debugging, profiling, and performance‑tuning skills across multiple target platforms.
• Excellent written and verbal communication skills.

Preferred Qualifications

• Knowledge of platform‑specific design systems (Material Design, Apple Human Interface Guidelines, Fluent Design).
• Hands‑on experience with Azure DevOps, GitHub Actions, or App Center for CI/CD.
• Familiarity with SQLite, Realm, or other embedded databases for local data persistence.
• Experience with accessibility standards (WCAG) and building inclusive applications.
• Contributions to open‑source .NET or MAUI community projects.
• Relevant Microsoft certifications are a plus.

Technology Stack

• Languages: C#, XAML, T‑SQL; exposure to Kotlin/Swift a plus.
• Frameworks: .NET 8/9/10, .NET MAUI, Blazor Hybrid, ASP.NET Core.
• Architecture: MVVM, Clean Architecture, Repository Pattern.
• Tools & IDEs: Visual Studio 2022, VS Code, JetBrains Rider.
• DevOps: Azure DevOps, GitHub Actions, App Center, Docker.
• Testing: xUnit, NUnit, Appium, Moq, FluentAssertions.
• Databases: SQL Server, SQLite, Redis.