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ISIXTYNINE | Services | Mobile Development | Cross-Platform Mobile App Development Services

Cross-Platform Mobile App Development Services

Deliver your app’s vision on multiple platforms without compromising on quality or performance.

30 + mobile development experts
8 years of experience Years of Experiences 
60 + projects delivered
4.8/5 stars overall review rating based on 55+ reviews

WHY CHOOSE US

WHY CHOOSE US

7/9 CLIENTS ARE READY TO RECOMMEND US

Our reputation for excellence is confirmed by 7 out of 9 clients willing to refer ISIXTYNINE, showcasing our standing as a trusted partner in web development, according to Clutch.

top 3,5% of developers

Our detailed selection process ensures that we only work with the most skilled and experienced professionals in the industry. Choose ISIXTYNINE and get reliable specialists on your side.

7 DIFFERENT INDUSTRIES' EXPERTISE

Having honed our skills across seven different industries, we bring a wealth of cross-industry knowledge to innovate and optimize solutions for your specific needs.

High Satisfaction Rates

Achieve your project goals with ISIXTYNINE. A remarkable 98% of our clients express satisfaction with the candidates we provide.

GLOBAL COVERAGE ACROSS TIME ZONES

We operate across six time zones, allowing us to work during your business hours and ensure seamless communication. With ISIXTYNINE, you get a team that works in sync with your schedule.

RAPID TEAM EXPANSION

Join the 35% of our clients who have seamlessly scaled their teams with additional specialists from ISIXTYNINE within just three months of engagement.

Advantages of Cross-Platform App Development

COST-EFFECTIVE DEVELOPMENT

Developing a cross-platform app can be more cost-effective than building separate native apps for each platform. Shared codebases mean reduced development time and resources, leading to significant cost savings.

FLEXIBILITY AND SCALABILITY

Cross-platform development frameworks are designed to be flexible and scalable. As the business grows, the app can be easily scaled or adapted to include new features or support additional platforms.

CONSISTENT USER EXPERIENCE

Cross-platform frameworks ensure that the app provides a consistent look and feel across different devices and platforms. This consistency enhances user experience and brand recognition.

EASIER MAINTENANCE AND UPDATES

Maintaining and updating a single codebase is simpler and more efficient. Any changes or updates can be synchronized across all platforms, ensuring users always have access to the latest features and improvements.

FASTER TIME TO MARKET

With a single codebase to manage, cross-platform apps can be developed, tested, and launched faster. This allows businesses to reach their target audience on multiple platforms in a shorter time frame.

WIDER REACH

Cross-platform apps are compatible with multiple operating systems, allowing businesses to reach a broader audience. This can lead to increased user engagement and potential revenue streams.

CROSS-PLATFORM DEVELOPMENT SERVICES

STAFF AUGMENTATION

FULL-SCALE DEVELOPMENT

POC/MVP APP DEVELOPMENT

UI/UX DESIGN SERVICES

CROSS-PLATFORM DEVELOPMENT CONSULTING

Boost your in-house team with our seasoned cross-platform developers. We provide the expertise you need, whether it's for a short-term project or a long-term collaboration.

HOW WE ENHANCE YOUR TEAM:

Access to experienced cross-platform developers;
Quick onboarding to integrate seamlessly with your processes;
Flexibility to scale up or down based on project requirements;
Expertise in leading cross-platform frameworks and tools.
Read More

From ideation to launch, we handle every aspect of your cross-platform app development, ensuring a consistent and high-quality experience across all devices.

OUR END-TO-END APPROACH:

Comprehensive requirement analysis and planning;
Designing for consistency across iOS, Android, and other platforms;
Rigorous testing for performance and user experience;
Deployment and post-launch support.
Read More

Validate your app idea quickly and efficiently. We develop Proof of Concept (PoC) or Minimum Viable Product (MVP) to help you test the waters without a full-scale investment.

BRINGING YOUR IDEA TO LIFE:

Rapid development to showcase your concept;
Feedback-driven iterations for refinement;
Scalable solutions ready for full-scale development;
Cost-effective approach to test market viability.

Crafting intuitive and consistent user experiences across platforms. Our design team ensures your app looks and feels perfect, irrespective of the device.

DESIGNING FOR A UNIFIED EXPERIENCE:

User-centric design approach for increased engagement;
Consistency in design elements across platforms;
Interactive prototypes for feedback and iterations;
Adherence to platform-specific design guidelines.
Read More

Navigate the cross-platform landscape with confidence. Our experts provide guidance on best practices, tool selection, and strategy to ensure your project's success.

GUIDING YOUR CROSS-PLATFORM JOURNEY:

Strategy formulation based on your business goals;
Recommendations on the best frameworks and tools;
Performance optimization and security best practices;
Continuous support and updates on industry trends.

Cross-platform Tech Expertise

Cross-Platform Frameworks

Backend technologies

CLOUD PLATFORMS

Cross-Platform Frameworks

Harness the power of leading cross-platform frameworks to build scalable and high-performance apps.

WHERE AND HOW WE USE IT:

  • Developing apps that provide a consistent experience across multiple platforms.
  • Leveraging the strengths of individual frameworks to meet specific project requirements.
  • Rapid prototyping and MVP development to quickly test app ideas in the market.
Flutter
Ionic
Kotlin Multiplatform Mobile
NativeScript
React Native
Xamarin

CROSS-PLATFORM EXPERTISE ACROSS INDUSTRIES

All Industries

E-Commerce

Deliver seamless shopping experiences across devices. Our solutions ensure consistent performance and design for online storefronts and payment systems.

Education

Craft educational apps that run smoothly on all devices. We empower institutions to reach learners with consistent, engaging tools.

Financial

Develop secure banking apps that users trust on any device. We prioritize security and user experience in financial transactions.

Health Care

Provide reliable healthcare tools across platforms. From telemedicine to patient records, we enhance care and communication.

Media & Entertainment

Engage audiences consistently across devices. Oursolutions cater to streaming, news platforms, and social networks.

Automotive

Drive automotive innovation with cross-platform apps. From dealerships to diagnostics, we connect the industry with customers.

GIS

Deliver accurate geographic information on any device. Our apps provide timely and consistent mapping solutions.

GIS

Cases

Explore projects brought to life by our Cross-platform Mobile developers, turning visionary ideas into tangible solutions.

Mobile
Saudi Arabia
E-Commerce
Middle East E-commerce Platform

Middle East E-commerce Platform

Driven by the demands of the retail sector and fueled by modern technology, Zid is a Saudi holding company, dedicated to revolutionizing the retail sector by simplifying the world of e-commerce. Zid provides all the tools you need to digitize and scale your business successfully.
Mobile
Saudi Arabia
E-Commerce
our contribution:
  • We're helping to grow a strong competitor for the Middle East market in e-commerce, similar to Shopify. This platform contains numerous add-ons, its own payment system, own delivery, and mobile app

  • For the mobile application, we've created an ordering system, analytical and management tools.

  • We've increased app performance for different devices.

  • The app has been successfully released in the Google and App stores.
  • tech stack:
    Python
    React Native
    more info
    Mobile
    USA
    Media & Entertainment
    Community-Building Platform

    Community-Building Platform

    Kinlia brings together people who share the values of authenticity, kindness, community, creativity, play, and personal growth.

    It is clear that they very carefully vet the people they hire.

    Gina Levy CEO
    Mobile
    UI/UX Design
    USA
    Media & Entertainment
    our contribution:
  • Introduced community chats and groups for enhanced user collaboration.

  • Underwent a full rebranding with a modern design to emphasize innovation.

  • Launched a sophisticated recommendation system for tailored user connections.

  • Integrated deep linking for direct access to events and communities.
  • tech stack:
    FigJam
    Figma
    JavaScript
    React Native
    more info
    Mobile
    Israel
    Health Care
    Digital Therapy Solution

    Digital Therapy Solution

    Upright Technologies is the leading digital health global company specializing in digital therapy and musculoskeletal pain. The company uses biofeedback wearable technology and behavioral science to prevent and treat the most common MSK condition of back pain. Upright's clinically validated technology is recommended by doctors worldwide and won several awards including the Best Medical App at MEDICA.
    Mobile
    Web
    Israel
    Health Care
    our contribution:
  • Our team focused on implementing a major custom integration that boosted company revenue.

  • We added PGP encryption for customer file security and improved existing systems for customer integration.

  • Also, our team developed a multistep enrollment form web application to cater to specific employer requests and enhance employee health decisions.
  • tech stack:
    JavaScript
    Node JS
    React JS
    React Native
    more info
    See All Cases

    TECH INNOVATIONS FOR YOUR ANDROID APP

    Empower your app with the latest tech innovations, ensuring it’s not just functional but revolutionary. Stay ahead, stay relevant, and captivate your audience.

    Artificial Intelligence

    Harness the capabilities of AI to make your app smarter, more intuitive, and responsive. From chatbots to predictive analytics, AI can transform user experiences and drive engagement.

    Cloud Integration

    Seamlessly integrate cloud services to enhance your app’s scalability, performance, and storage capabilities. Ensure real-time data syncing and accessibility from anywhere.

    Augmented Reality

    Integrate AR features to offer immersive experiences to your users. From virtual try-ons to interactive 3D models, AR can redefine user interactions within your app.

    Internet of Things

    Connect your app with smart devices and sensors to provide users with real-time data, automation, and enhanced functionalities. IoT integration can open up new avenues for user engagement and utility.

    MEET OUR AVAILABLE CROSS-PLATFORM EXPERTS

    Andreas-Robert

    Mobile Flutter Developer
    SUMMARY

    Experienced Mobile Flutter Developer with 3+ years and huge track record of personal and client projects.

    • Languages and Frameworks:Dart, .NET Core, JavaScript, Java, C/C++, Flutter, HTML, CSS.
    • Testing & Workflow: Jest, Git, Azure DevOps, GitHub Actions.
    • State Managers: GetX, Provider, Cubit/Bloc.
    • Cloud: Firebase, Cloud Firestore, Google Cloud, AppWrite.
    tech stack:
    Dart
    Firebase
    Flutter
    Google Cloud Platform

    Alex

    Mobile React Native Developer
    SUMMARY

    Senior Mobile React Native Developer with 7 years of experience in developing mobile applications.

    • Web Technologies: HTML5, CSS3, SCSS, SASS, LESS, JavaScript, TypeScript, JQuery, JSON, XML, AJAX, Apache, Webpack, Bootstrap, GraphQl, NodeJS, React Native, ReactJS, NextJS.
    • Web Servers: AWS.
    • Database: MySQL, PostgreSQL.
    • Version Controls: GIT, SVN.
    tech stack:
    AWS
    JavaScript
    PostgreSQL
    React Native

    Jakub

    Mobile React Native Developer
    SUMMARY

    Experienced Mobile React Native Developer fromPoland specializing in developing and researching mobile applications and technologies.

    • Programming languages: JavaScript, Typescript, C#.
    • UI: React, React-Native, HTML, CSS, SCSS.
    • Frameworks: MVC, MVVM, EntityFramework.
    • Databases: MS-SQL.
    • Build/Deploy: Gradle, xCode, Codepush.
    tech stack:
    AWS
    Firebase
    JavaScript
    Jest
    React Native

    Ivan

    Mobile React Native Developer
    SUMMARY

    Mobile Developer with 4+ years of experience in developing React Native hybrid applications.

    • Web Technologies: HTML5, CSS3, JavaScript.
    • JS Frameworks: React.js, Redux, Redux-Thunk, Redux-Saga, React Native.
    • Cloud Services: AWS, Firebase.
    • UI Frameworks: Material UI.
    • IDE: WebStorm, Sublime Text, VS Code.
    tech stack:
    AWS
    Firebase
    JavaScript
    React JS
    React Native
    Redux

    Denis

    Mobile React Native Developer
    SUMMARY

    Senior Mobile Developer located in Poland with around 5 years of experience in developing mobile applications with React Native.

    • Web Technologies: HTML5, CSS3, JS, TS.
    • JS Frameworks: React Native, React.js, Redux.
    • UI Frameworks: Material-UI, Bootstrap.
    • IDE: XCode, Android Studio, VS Code.
    tech stack:
    JavaScript
    Jest
    React Native
    Redux

    Whom We Serve

    STARTUPS & ENTREPRENEURS

    For those launching new ventures or testing innovative ideas, cross-platform development offers a cost-effective way to reach diverse audiences across multiple platforms. We help startups build MVPs and full-fledged apps that resonate with their target users.

    SMEs EXPANDING THEIR DIGITAL PRESENCE

    Small and medium-sized enterprises looking to expand their digital footprint can benefit from cross-platform apps. We assist SMEs in creating apps that ensure consistent brand representation across Android, iOS, and other platforms.

    LARGE ENTERPRISES SEEKING UNIFIED SOLUTIONS

    For large corporations aiming for a unified digital solution across various devices and operating systems, cross-platform development is the key. We provide scalable and robust app solutions that cater to a vast user base.

    BUSINESSES MIGRATING FROM NATIVE TO CROSS-PLATFORM

    Companies looking to transition from native apps to a more versatile cross-platform approach can rely on our expertise. We ensure a smooth migration while retaining essential features and enhancing user experience.

    EMBRACE THE CROSS-PLATFORM ADVANTAGE

    Specializing in cross-platform solutions that resonate with diverse user bases. Startups to giants, get your MVP ready in as little as 3 to 6 months and venture into the vast mobile landscape.

    TESTIMONIALS

    Here are testimonials from our valued clients that highlight our unparalleled expertise:
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    It is clear that they very carefully vet the people they hire.

    feedback summary:

    The developer and the QA tester have exceeded the company’s expectations. They’ve delivered excellent work and eliminated bugs from the platform. They’ve also introduced new features and ensured the flawlessness of the app. ISIXTYNINE manage the engagement well, communicating effectively throughout.

    Gina Levy
    CEO at Kinlia
    view project
    project:
    Community-Building Platform
    country
    US
    our contribution:
  • Introduced community chats and groups for enhanced user collaboration.

  • Underwent a full rebranding with a modern design to emphasize innovation.

  • Launched a sophisticated recommendation system for tailored user connections.

  • Integrated deep linking for direct access to events and communities.
  • tech stack:
    FigJam
    Figma
    JavaScript
    React Native

    ISIXTYNINE’ work and infrastructure are fantastic.

    feedback summary:

    ISIXTYNINE has met the client’s requirements and developed an app according to their needs. The app has been down 15,000 times and has an average of 2,200 daily visitors. ISIXTYNINE meets deadlines and stays on budget. Their team works quickly and is responsive through WhatsApp, Confluence, and Jira.

    Ian deQueiroz
    CEO at SENDY
    view project
    video review
    project:
    Adventure Sports Equipment Marketplace
    country:
    United States
    our contribution:
  • Our team developed the project from scratch and gained 10k users and 1k orders after release.

  • We created fully functional three parts of the project: a web app, iOS and Android apps, and an administration panel for managing and reporting purposes.

  • The rental component of the marketplace was inspired by best practices and made better.

  • We integrated complex systems with UPS, Stripe, and Shopify.
  • tech stack:
    Figma
    JavaScript
    Laravel
    PHP
    React JS
    React Native

    They have skilled and committed development staff.

    feedback summary:

    ISIXTYNINE’ dedicated development team produces high-quality work. They’re very organized, following a structured workflow to assure each task is complete. Despite some turnover, the current team is responsive and efficient. It will likely be a lasting partnership.

    Arthur Darde
    CTO at Otoqi
    view project
    video review
    project:
    Vehicle Delivery Platform
    country:
    France
    our contribution:
  • Our team perfectly designed a dual OS mobile application developed by ISIXTYNINE that serves as a great extension to Otoqi’s platform and brings its usability, efficiency, and mobility to a completely new level.

  • Our client and their customers now can use the whole range of Otoqi’s service on the go, thus saving their precious time and cutting their financial costs.
  • tech stack:
    Angular
    Figma
    Java
    JavaScript
    React Native

    I desperately needed quality developers that would stick with me, and I’m certain ISIXTYNINE will do just that.

    feedback summary:

    The app’s user base has more than doubled thanks to ISIXTYNINE’ ongoing effort. Clear and committed, ISIXTYNINE provides product optimization consulting and has been instrumental in improving the app’s visuals. Their diversity of approaches helps deliver quality for clients of all sizes.

    Rasim Aliyev
    Co-founder and CEO at Raters
    view project
    project:
    Personalized Movie Recommendation App
    country:
    UK
    our contribution:
  • Our team focused on creating a mobile Android component to extend the customer coverage and allow the platform’s users to enjoy reliable recommendations from trustworthy movie reviewers and friends.

  • We developed a high-performance backend to support all data exchanges within the platform in light of the increased number of users.

  • Lastly, we integrated social network functionality to exchange opinions on the video content.
  • tech stack:
    JavaScript
    Kotlin
    Laravel
    PHP
    React JS
    Sketch
    Swift
    Zeplin

    Priorities of each task were delivered with a strong balance between business and development goals.

    feedback summary:

    ISIXTYNINE creates iOS and dashboard applications for an jewelry media business. Their most recent project is developing a photo app that can generate a reliable and consistent quality to all mobile phones.

    William Chu
    Founder & CEO at Picup Media
    view project
    project:
    AI-Powered Jewelry Imaging and Video Solution
    country:
    Australia
    our contribution:
  • By utilizing the expertise of the ISIXTYNINE Project Team, which includes 17 technical specialists and a project manager, we've recreated the client's apps into scalable and user-friendly mobile solutions, enhancing the client's business and user's photo experience of their jewelry.


  • We were using the power of AI to get competitive advantage for Picup Media platform over its rivals.
  • tech stack:
    Figma
    JavaScript
    Kotlin
    Laravel
    Node JS
    PHP
    React JS
    Swift

    TELL US ABOUT YOUR NEEDS

    Just fill out the form or contact us via email or phone:
    • contact@i69app.com

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