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Explore our comprehensive Xamarin App and .NET MAUI development services, designed to support every stage of your mobile app journey. From strategy and design to implementation, testing, and ongoing maintenance, we deliver faster results and native-quality performance across platforms.
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Get a Free Consultation NowOur Xamarin app development experts, with experience at leading companies, develop and deploy tailored solutions to meet your business needs and unique industry demands for sustainable results and long-term success.
CEO, Technology ServicesAs Toptal’s CEO of Technology Services, Robert leads strategy and operations across our technical services portfolio, spanning AI, automation, and operations. He previously served as Deloitte’s Managing Director & Chief Commercial Officer, transforming its Cloud Operate and Engineering business into a multibillion-dollar operation. He held senior roles at IBM, Velocity, co-founded Corio, and was CIO for two Fortune 100 manufacturers.As Toptal’s CEO of Technology Services, Robert leads strategy and operations across our technical services portfolio, spanning AI, automation, and operations. He previously served as Deloitte’s Managing Director & Chief Commercial Officer, transforming its Cloud Operate and Engineering business into a multibillion-dollar operation. He held senior roles at IBM, Velocity, co-founded Corio, and was CIO for two Fortune 100 manufacturers.
Previously At
CEO, Technology Services
As Toptal’s CEO of Technology Services, Robert leads strategy and operations across our technical services portfolio, spanning AI, automation, and operations. He previously served as Deloitte’s Managing Director & Chief Commercial Officer, transforming its Cloud Operate and Engineering business into a multibillion-dollar operation. He held senior roles at IBM, Velocity, co-founded Corio, and was CIO for two Fortune 100 manufacturers.
Previously at
Technology Experience
35+ Years
Delivery Manager
Rachael serves as a Delivery Manager at Toptal with a focus on leading diverse global teams in developing innovative solutions for our clients. She works across multiple disciplines, including technology, marketing, and management consulting. Rachael specializes in managing people and client relationships, process optimization, and driving teams toward optimal business outcomes.
Previously Managed Client
Experience
9+ Years
16+ Years
of Experience
Jose is a software architect and developer with desktop, web, mobile apps, and big data expertise. He worked at billing for Microsoft using Azure, power apps, flows, and the big data platform, one of the world's biggest clusters. He co-founded a last-mile delivery app called Encalientes that connects restaurants with customers and drivers. Jose's contributions to the app were critical for it to reach over 60,000 active users and become operational in four cities.
Previously at
19+ Years
of Experience
With a PhD in computer science and over 18 years of experience creating mobile applications, Joel has a passion for creating flawless user interfaces and applications that exceed expectations. In addition, his knowledge of databases and back-end requirements gives him a deep understanding of an application's complete architecture.
Previously at
21+ Years
of Experience
Andy, a full-stack developer with over 21 years of software experience, specializes in the .NET stack, including requirements gathering, SQL database design, and development for web, Windows, and mobile platforms. Skilled in system monitoring, he excels in building .NET MAUI cross-platform apps, conversational bots for Amazon Alexa and Google Home, and full-stack .NET solutions for both web and Windows.
Previously at
20+ Years
of Experience
Seema brings more than 20 years of software testing and quality assurance expertise to the table. She has substantial experience with manual testing and the test automation of web and mobile applications. Seema is a certified Scrum master, an IBM-certified Db2 professional, and an AWS-certified solutions architect comfortable with Agile and Waterfall approaches. Her in-depth knowledge of API and performance testing delivers excellent results.
Previously at
9+ Years
of Experience
With nearly a decade of hands-on experience in product management, Alex has led cross-functional teams at industry giants like Google, Apple, and Expedia to bring human-centered, data-driven products to life. Grounded in a neuroscience background and bolstered by certifications from Product School and the Scrum Alliance, Alex blends behavioral insight with technical acumen to deliver innovative solutions across e-commerce, IoT, and consumer tech.
Previously at
17+ Years
of Experience
For the last 17 years, Alex has built, managed, and led a design agency that provides branding, marketing, and web development services. He grew it from a small startup to one of the best brand design firms in the city in less than three years. During that time, Alex has provided branding, app design, and UI/UX solutions for clients in various industries, including Fox Sports, Credit Karma, Goodwill, the USDA, and the US Air Force.
Previously at
9+ Years
of Experience
Kyle has launched major software products used by thousands at US Big Tech firms and French unicorn startups. He has taught and advised on AI at multiple startups and pioneered Amazon’s first AI chat plugin in JetBrains, showcased at AWS re:Invent 2023. Kyle actively contributes to cutting-edge AI projects and develops business-grade AI agents using LangChain (LangGraph).
Previously at
16+ Years
of Experience
With 16+ years in UI, UX, and product design, Daniela has had the privilege of working in renowned companies like Meta, eBay, Autodesk, Disney, and Salesforce, as well as contributing to 0-to-1 projects for agile startups. Her experience spans a variety of products, from native apps and responsive websites to complex SaaS platforms. Daniela's approach integrates product vision, strategy, and execution, ensuring high-quality delivery in collaboration with engineering teams.
Previously at
31+ Years
of Experience
Anderson is a software engineer who’s strongly committed to delivering the best solution for the problem. In his more than 31 years in the IT industry, he’s worked on projects in custom web development, collaboration portals, e-learning platforms, enterprise resource planning, content management systems, project management tools, mobile apps, reporting, and business intelligence platforms up to Internet of Things projects. Anderson has an MBA in project management and holds a PMP and MCSD .NET certification.
Previously at
10+ Years
of Experience
A seasoned front-end engineer, Sergei Garcia boasts more than a decade of impact. Notably, he orchestrated a dynamic overhaul at Typing.com through a 2.5-year front-end refactoring to React, revolutionizing UX for its 35+ million users. He is celebrated for creating high-performance applications with exemplary UX, and his empathetic leadership and zest for continual growth establish him as more than a tech maestro. He’s also an exceptional mentor who elevates every team he joins to new heights.
Previously at
18+ Years
of Experience
Giorgi is a software developer with over a decade of experience, specializing in C#, ASP.NET Core, REST, GraphQL, MAUI, Xamarin, Entity Framework Core, AWS, Azure, and SQL Server. He has also worked extensively with other frameworks and systems, including ASP.NET MVC, ASP.NET Web API, WCF, Avalonia, WinForms, Oracle, and more.
Previously at
25+ Years
of Experience
Seva is a software professional with 24 years of development experience. He graduated from UC Berkeley with degrees in electrical engineering and computer science, and a minor in material science and engineering. Seva is a team lead, project manager, mentor, solution architect, and hands-on developer who builds efficient, scalable, and fault-tolerant solutions for enterprise companies and startups.
Previously at
22+ years
of Experience
Evgeny is a self-described hybrid designer which means that he's very experienced and successful in both UX/UI and visual design. He has over 15 years of experience in designing the UX/UI for web and mobile applications across a broad range of industries including the internet of things (IoT), retail, computer games, design, real estate, and entertainment. His specialties are UX design, UI interaction design, and mobile/web application design.
Previously at
13+ Years
of Experience
Huzefa is a hands-on technology leader and programmer specializing in full-stack development using React, Flutter, Node.js, and Android. As a back-end and mobile engineer, he has 12 years of experience in startups and high-paced engineering environments. Huzefa excels in managing engineering teams, driving multiple successful product launches, and delivering solutions on time and within budget.
Previously at
11+ Years
of Experience
Dolly is a QA engineer with more than 11 years of experience in a range of industries, including real estate, travel, finance, and aviation. She has created multiple testing frameworks from the ground up using Selenium, TestNG, Cucumber, and Cypress and has automated QA processes. Dolly manages test execution not only from the technical point of view but also from the customer’s, as she believes product usability is as vital as functionality.
Previously at
Looking for guidance about the perfect Xamarin app development service for your needs?
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UNRIVALED EXPERTISE
Having previously worked with these leading global companies, our talent brings valuable insights and expertise to deliver world-class outcomes.
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Challenge: The company’s Xamarin-based app struggled to integrate a radio frequency identification (RFID) reader, leading to inefficiencies in time and attendance tracking.
Solution: Toptal rebuilt the app using .NET MAUI, integrating an RFID software development kit (SDK) to read and process data from the client’s cards. Then Toptal implemented automated CI/CD pipelines to enable frequent builds and continuous validation of the integration through regular feedback.
Outcome: The app’s successful RFID integration streamlined workforce management by enhancing time and attendance tracking efficiency. The improved app provided the company with a competitive edge, boosting operational efficiency and supporting future growth.
Newsweek and Statista’s rankings were based on an independent survey of more than 2,400 decision-makers at Fortune 500s.
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Highest ranked across all industries
Other Professional Services
Methodology for the Rankings
How likely the respondent is to recommend the selected company to others.
Measures the convenience of interaction with the company and efficiency of processes.
Measures the company’s cost-effectiveness and quality relative to price.
Measures whether the company consistently meets or exceeds expectations in quality and timeliness of deliverables.
Measures the company’s ability to consistently fulfill commitments and maintain customer trust.
OUR THOUGHT LEADERSHIP
Read the latest articles and resources to keep you current on emerging trends in cross-platform app development, Xamarin best practices, mobile app design, and more.
Keeping your Android codebase maintainable as your codebase grows can be a challenge. In this article, Toptal Freelance Android Developer Abhishek Tyagi shows how to combine MVVM with Clean Architecture—the latter as described by Robert C. Martin—to write decoupled, testable, and maintainable code.
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