Safari push notifications ios jobs

I am looking for a proficient designer to create an engaging, user-friendly mobile app aimed at adults between 10 to 95 years old. The app is primarily for productivity purposes, and needs to be compatible with both iOS and Android platforms. MAIN REQUIREMENTS: -The design needs to cater to users in the 10-95 age bracket. -The app must function seamlessly on both iOS and Android platforms. SKILLS AND EXPERIENCE: - Successful candidates will have prior experience in mobile app design. - Familiarity with both iOS and Android platform requirements is crucial. - Experience creating productivity tools will be a distinct advantage. - Focus on user interface design and the ability to create an engaging user experience for our adult demographic will be highly regarded. ...

I'm searching for an experienced app developer to create a basic iOS application that calculates sales commissions. Functionality: - The app should be constructed to input five distinct values: Sales amount, Commission rate, Material Total, Labor Total, Par Sale after Discounts. - The application should compute the commission based on the percentage of the Sales amount. - The method of calculating the percentage in relation to the other input values has not been specified, so flexibility and adjustability should be built into the app to address this. You enter the total cost of materials and labor separately plus the current commission rate. Then you choose from calculated values what discounts can and will be applied. The you enter the actual agreed upon sale price. Th...

I'm in need of a comprehensive Figma design for my new mobile app aimed...facilitating the booking of meeting rooms, training rooms, and dedicated offices. The app should be designed for both iOS and Android platforms. Key Features: - The app will have an availability-based booking system which allows users to view and book available rooms and offices based on their schedules and needs. - Two actors: the business which has a different workflow to register their facilities along with the rooms, types, catering services, etc.. and also the client which has different workflow to explore the rooms and book instantly. Ideal Skills and Experience: - Proficiency in Figma and mobile app design. - Prior experience with designing booking systems. - Understanding of iOS and Andr...

I am in need of a highly skilled developer to create a comprehensive sports gambling app. Our goal is to provide users with an interactive platform that allows them to gamble on various sports events, while also offering high-quality live streaming and real-time communication. Key Features: - Multi-platform: The app should be available on Android, iOS, and the web, catering to a wide user base. - Comprehensive Sports Coverage: The app should include a wide array of sports events, ensuring that users can bet on their favorite sports. - Live Streaming: High-quality live streaming is a priority. Users must be able to watch the events they're betting on, in real-time. - Real-time Communication: A live chat feature that connects users betting on the same event is essential. This wi...

PLEASE CHECK THE DOCUMENTATION FIRST BEFORE APPLYING, YOU NEED TO KNOW WHAT YOU'RE REGISTERING FOR! I'm seeking a IOS/JavaScript/Lua developer with considerable experience in mobile platforms to compose a script of medium complexity. The main purpose of this script will be to automate certain processes on a mobile device. using AutoTouch. Key Deliverables: 1. Create a script that will automate tasks. 2. Ensure compatibility and smooth operation on a mobile platform. 3. Enable interaction with external APIs or services as necessary. You must have a background in automation scripts and API interactions and should be comfortable working with mobile platforms. Fluency in English is preferred for effective communication throughout the project. I’d need it to -set

I'm in need of a highly skilled React Native developer who can attain a cross-platform compatibility for both iOS and Android in building my social networking application. The primary function of the app would be to enable social networking. The ideal candidate must be experienced in developing intuitive mobile applications and display a keen understanding of design. For my project, a minimalist design style is preferred - delivering a clean, straightforward, and easy-to-navigate user interface. Ideal Skills and Experience: - Proven experience in React Native development. - Familiarity with cross-platform compatibility. - A strong portfolio of social networking applications. - Strong understanding of minimalist design concepts.

...camper when the ambient light is low and there is detected motion. The camper's lights are standard 12DC lights (not LEDs). When there is no motion for 5 minutes or the ambient light reaches a given threshold, the lights will turn off. There must be a manual way to turn on/off the lights without turning the system off. This will be done with button inputs to the microcontroller, that the user can push and the system will turn and keep the lights on/off accordingly regardless of the status of the sensors. Display the status of the system on the ST7735 LCD screen. Ambient lighting must be in lux and not voltage levels. Ideal Skills and Experience: - Proficiency in C programming and experience with TM4C123GH6PM Microcontroller. - Prior experience in developing smart systems...

Code: iOS build (yarn ios) fails - see attached logs. Requirements: - fix iOS app build - android build should stay untouched - it need to build iOS app without errors - no library should be removed - existing libraries should work as they are - it should build with Xcode 15 - it should build on MacOS 14

I am looking for a seasoned app developer who has skills and experience in creating cross-platform applications for both iOS and Android. The primary function of this app will be E-commerce. Key Requirements: - Develop a hybrid app that can operate seamlessly on both iOS and Android platforms. - The app should be user-friendly, responsive, and able to handle e-commerce transactions efficiently. - Ensure that the app integrates with payment gateways such as RazorPay, PhonePe, and PayU, in addition to other expected e-commerce functionalities. Ideal Skills: - Proficiency in hybrid app development for iOS and Android platforms. - Previous experience in developing E-commerce apps. - Expertise in integrating payment gateways, especially RazorPay, PhonePe, and PayU. - Str...

I'm seeking a professional who can build my online store website and applications from scratch. phase 1 : website (how much) phase 2 : android app (how much) phase 3 : iOS app (how much) phase 4 : admin app and delivery + affiliate marketing and shops app (how much ) phase 5 : shipping system integration Critical requirements include: - Integration of functionalities like a shopping cart system, user registration process, product review system, and additional features like a delivery system and an affiliate marketing system. - Leveraging the logo and branding assets that I already possess. Ideal skills and experience: - Expertise in developing custom-built solutions as opposed to WordPress or Shopify. - A strong understanding of the necessary e-commerce functionaliti...

I'm encountering an issue with my iOS development project and need assistance in resolving it. - I've already set up signing certificates for iOS development in the past. - I've primarily been using Xcode's automatic management for this purpose. - The recent update I made was to Xcode. Since then, I've been facing the error: "No signing certificate 'iOS Development' found". The ideal freelancer for this project should be experienced in iOS development and have a good understanding of Xcode's automatic certificate management. A solid knowledge of updating processes in Xcode and macOS would also be helpful. The main goal is to troubleshoot and resolve the certificate error promptly to ensure the project can be ...

In need of a talented professional who can provide both architectural but mostly technical drafting services for a medium-sized residential design project. This was a project I had briefly started as a student but am looking for a professional to revisit and complete final drawings so I can begin to render my design and push it further. (NOT for an actual building to be constructed) I currently have rough plans and sections and would be looking for someone to make up: 1:100 General arrangement Plans 1:50 plans / sections 1:20 plans / sections 1:5 details such as threshold detail, jamb to wall detail, roof to wall detail etc..

I am seeking an experienced mobile app developer who can design and launch an intuitive app for both iOS and Android. The main objective of this app is to provide a platform for consumers to effortlessly select and order the services they want. Key features to include: - User-friendly interface - Comprehensive list of services - Seamless ordering system The ideal candidate should be proficient in cross-platform app development and have prior experience in creating similar service-oriented apps. I am expecting this project to be completed within a month. Therefore, the ability to work under a tight schedule is crucial for this job.

I'm looking for a skilled developer to update my existing Flutter mobile application. The app currently supports both iOS and Android platforms. The key updates I need include: - **Facebook SDK Update:** The app's Facebook login feature needs to be refreshed. This should include ensuring the login functionality works seamlessly with the latest version of Facebook SDK. - **Compatibility Check:** Alongside the Facebook SDK update, the app needs to be made compatible with the latest versions of Node and Flutter. See complete list of tasks @ Code will be provided by Github for both server/app. Ideal candidates for this project should have: - Profound experience in Flutter development and app updating - Strong understanding of Facebook SDK and its integration

...travels by drawing the route on a map. - Provide suggestions for accommodation and attractions based on other users' trips and data from OpenStreetMap and Wikipedia. - **Real-Time Information:** - Provide users with current information like weather, traffic, local events, and news. 5. **Iteration 5: Social Features & Improvements** - **User Engagement:** - Implement user notifications for new comments, messages, and trip interactions. - **Social Media Integration:** - Add support for sharing trips directly to social media platforms. - **Admin Panel Enhancements:** - Improve the admin panel for better data management. ### Requirements - **Technical Skills:** - Expert-level experience with Python and Django web framework. - Profi...

I'm in need of a skilled iOS developer who can craft a utility application centered around camera functions. Here are my specific requirements: 1. Diverse Filters: I want my app to provide an array of filter options to give users the flexibility to be creative with their photography. 2. Manual Controls: The app should give users manual control over exposure, focus, and other camera settings. 3. Video Recording: Beyond photo-capture capabilities, the software must also offer video recording. Ideally, I'm looking for someone who's experienced in working with iOS platform and has a strong knowledge of camera functions. If you've previously developed camera-based apps, that would be an additional plus. Please reach out if you are experienced in build...

Looking for an experienced web developer to spearhead the creation of a robust travel booking platform from the ground up. The envisioned website aims to serve a diverse clientele, offering seamless booking experiences for flights, hotels, cars, and cruises....information, enhancing the overall travel experience for users. Successful candidates will possess a wealth of expertise in full-stack web development, with a keen eye for UI/UX design principles. Proficiency in platform integration is a must, including in-depth knowledge of GDS and the ability to seamlessly integrate Amadeus and Sabre APIs. Experience in mobile wallet integration for both Android and iOS devices is highly desirable. Join us in creating an innovative, user-centric travel solution that sets new standards in the...

I'm on the lookout for a proficient iOS developer conversant with SwiftUI for iOS 13. The critical task involves creating a sticky header animation on my app. Unfortunately, due to the urgency of this project, you would need to be available to complete it as soon as possible. Key Deliverables: - Ensure the header view is stickable at the top of the page. Ideal Freelancer: - Experienced in Swift and SwiftUI for iOS 13. - Proven track record of delivering high-quality iOS apps. - Capable of working under tight deadlines. Please provide evidence of your ability to deliver on these tasks when you place your bid.

I'm currently engaged in the development of a game for mobile platforms, specifically iOS and Android. The game is being coded in C#. Here's what I need your expertise for: - Assisting in creating and integrating custom scripts for the game - Debugging and optimization of the code already written. - Potential future coding requirements as the game develops. Ideally, you should: - Have expertise in C# mobile game development - Have prior experience with both iOS and Android platforms. - Being a passionate gamer would be an added advantage, as this will also lead to better understanding of the requirements. Upon successful collaboration, there is a potential for an ongoing work relationship.

We are seeking a skilled web developer to create a professional and visually appealing website for our small iOS app development company. Our goal is to have a simple yet effective website that showcases our app currently available on the App Store, integrates essential company information, and maintains a focus on our app-oriented theme while ensuring fast page load times for an optimal user experience. What you will have to do: * Design and develop a clean, user-friendly website that reflects our brand and app-focused business. * Create a main page that effectively showcases our current app, including visuals and key features. * Develop additional pages including About Us, Contact, and a News section to keep users informed. * Integrate a dynamic Privacy Policy and Terms &...

...website is to enhance brand visibility and awareness. - Payment gateways should include Stripe and Cryptocurrency. -This website also need to have client / customer panel from where customers can see the order status with progress bar and re-order of any old posted order. -There should be a floating chat bar option. -Admin should have option to add service later -App should sent notification/ push when new service added or order update. Ideal skills for the job: - Strong experience in web development, particularly in e-commerce sites. - Knowledge of social media marketing and SEO is a big plus. - Familiarity with payment gateway integrations. - Creativity in user interface and experience design. - Good communication skills for potential ongoing support. referance website: ...

...of showcasing the uniqueness of my products and providing an immersive virtual tour. They should be strategically designed to create engaging, interactive animations that captivate visitors and encourage them to explore the site further. - **Main Focus**: The designs should ooze creativity. While I appreciate the value of realism and simplicity in design, I'm really looking for someone who can push the boundaries of what's possible and bring a fresh, innovative approach to my website. - **Skills and Experience**: Ideal candidates will have extensive experience in 3D website design, with a portfolio showcasing their capability in product visualization, architectural visualization, and character animation. Strong creativity skills and a keen eye for engaging, interacti...

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...categories 3. Video Classes 4. Live Classes 5. Chat in Live Class 6. Mock Test Series 7. PDF & Notes 8. Offline Downloading 9. Payment Gateway Integration 10. Coupons 11. Challenge Module 12. ePapers 13. Student Community Deliverables: 1. Android and iOS Application 2. Super Admin Panel to manage the product 3. Technical Consultancy for all components required to successfully launch this product 4. App publishing and deployment Total Cost: USD 4000 Milestones: 1. Design and Planning Phase: 750 USD (Week 1 and 2) 2. Frontend development of Android and iOS app: 750 USD (Week 3 and 4) 3. Halfway development of the product: 750 USD (Week 5) 4. After completion of Web Admin Panel: 750 USD (Week 6-7) 5. Product completion and uploaded to stores: 1000 USD (Week 8) I am ...

I would like to add stripe Subscriptions to my iOS app.

I'm looking for a F...API for Facebook login needs to be fixed, as the current implementation is not working as intended. - Platform: The app is targeted at both iOS and Android, so it's crucial that the fix is tested and functional on both platforms. The ideal candidate for this project should have: - Proven experience with Flutter, particularly with integrating third-party APIs like Facebook's for login functionality. - A good understanding of Meta APIs and the specific requirements for integrating them into Flutter apps. - The ability to troubleshoot and fix issues promptly and efficiently. - Experience in testing and ensuring the app functions correctly on both iOS and Android. Please get in touch if you think you have the necessary skills and expertis...

I am in need of an expert who can design and implement socket connections for P2P engagements in my web...Payment, and Social Media integrations: The platform should seamlessly connect with these services for a holistic user experience. Supported Platforms: - The socket connections and integrations should be compatible across web browsers, iOS devices, and Android devices. Ideal Skills & Experience: - Proven experience developing real-time chat modules with P2P messaging. - Solid background in integrating email, payment gateways, and social media into web apps. - Proficient in making the functionalities compatible across multiple platforms including web, iOS, and Android devices. Your proposed solution should deliver efficient and smooth in-app communication that prom...

...to help me develop a decentralized wallet application. This wallet application should have the ability to: - Create and manage multiple wallets. - Send and receive cryptocurrency. - Provide a clear and detailed transaction history. - Execute multichain swapping of digital assets. - Handle 2 custom coins designed for our ecosystem. In addition to these functionalities, the app must run on both iOS and Android operating systems. Moreover, I'd like to collaborate with someone who has a knack for developing user-friendly interfaces. Your expertise can assist us in providing a seamless and engaging user experience. Finally, if you have previous experience in ICO website development, that would be a huge plus. This may contribute to our project's overall success. Only a...

I need an experienced developer who can design and build a proof of concept(POC) within 2 months for marketplace app for both Android and iOS. This app should function seamlessly, being simple to use with users able to: - Filter searches - View listings - Interact via a messaging system - Execute secure payments - Utilize an AI-based search We do not need the scalability and storage aspect covered in POC phase. I just production ready UX. Ideal candidates have a proven track record in mobile app development, specifically with e-commerce platforms. Familiarity with AI integration is desirable. If you possess great UI/UX design skills and have the ability to create logical and intuitive navigation, I am interested to hear more about your work process and past projects.

I did a Android app with MIT appinventor that i need to convert to iOs. The app has only 3 screen (the 1st with logo, second is the programm, and the last is the user manual), just need to communicate with the Bluetooth (a BLE 4.0) to send a simple string to a Arduino board. The app is really easy, i attached a screenshot of the main page. - The Bluetooth button (when click) will show a list of all available BLE. - The red "Non connecte" will go in green and "Connecte" when connected, and when click will disconnect the Bluetooth. - The 1st ok button (at "Reset réglage d'usine") will send a string by bluetooth to put all value at factory. - The slider select a value between 0 and 100. - The button ok bellow the slider ("Envoyer le r&eacu...

I'm looking for a Flutter developer who can provide one-on-one tutoring in Tamil. The goal is to elevate my skills to an advanced level, particularly in optimization and deployment techniques for both Android and iOS app development. Key Requirements: - Proficiency in Flutter: You should have extensive experience with Flutter app development, capable of teaching at an advanced level. - Communication Skills: Fluency in Tamil is essential, as the sessions will be conducted in Tamil. - Teaching Experience: Prior experience in tutoring or teaching Flutter development is highly preferred. Preferred Learning Format: - One-on-One Sessions: I prefer live, one-on-one sessions to enhance the learning experience. This project is ideal for a Flutter expert who not only has a strong tech...

I am looking for someone to create me a website having the same functionality of & www.marieclaire.com. The front page display should be something like this It should have a Marie Claire Edit design having a minimum 3 across the screen shopping window https://www.marieclai...site. Add ssl certificate and to domain name etc Implementation of social media and other services Backend support for 1 year The website to be delivered and working within a specific time frame which must be agreed before taking the project on. You must be experienced at minimum 5 years and show me an existing portfolio of your works. I would also like to have a cost for an iOS and android app this must be separate cost given.

I'm in need of an EMR system tailored for wound care providers who work with patients at their homes. This system should be designed for iOS platforms and must ensure secure patient data storage via cloud-based technology. The system should encompass the following key features: - Patient Information Management: A feature that allows for the efficient and secure storage of patient data. - Treatment Planning and Documentation: The system should support the creation and management of comprehensive treatment plans and documentation. - Appointment Scheduling: An integrated scheduling system to facilitate the organization of patient appointments. - Wound Care Assessment and wounds Measurements: The system should accommodate for capturing and storing wound care assessment measurement...

I need a skilled developer proficient in *Next*, *React* and *Flutter*. Although I didn't detail specific functionalities to be developed in React, I expect ...React, I expect that your expertise will guide the process. Due to the lack of provided features for the Flutter application, you should be able to propose efficient strategies and introduce standard app features, considering current trends in app development. Proficiency with user interfaces, third-party API integration, data visualization, user authentication, geolocation services, and push notifications would be advantageous. Your role involves not just coding but also contributing to design and feature ideas. please start proposal with "SWEET". And please explain about your skill carefully, if you w...

A new type of Browser for a Start Up which tries to be in the Islamic matters. Our goal is to give the ummah the best safety in matters of Halal/Haram confrontation.

Please provide me the costs only after check design and document carefully. It need to be finished very quickly. Design : Please check document carefully with design.

Hi abdoalsharif, I noticed you posted a following project ( https://www.freelancer.com/projects/iphone-app-development/commerce-Website-Android-iOS-App-38076263/details )

I'm in need of a skilled Flutter developer to help bring my application idea to life. The app already has a design/mockup ready, therefore, we'll dive straight into development. Key Features to Implement: - User Login: Experience with creating secure login systems is essential. Users should be able to create accounts, log in, recover passwords and so on. - Push Notifications: The application will need to support timely push notifications. Understanding how to implement this in Flutter is necessary. - In-app Purchases: I require someone with experience in setting up and managing in-app purchases. - DoorDash API Integration: The ability to successfully integrate a third-party API, specifically DoorDash API, into a Flutter application is also crucial....

...Features: - Prayer Time Notifications: The app must notify users of prayer times. - Qibla Direction Finder: It should include a reliable Qibla direction finder. - Quran Recitation: The app should have a feature for users to listen to Quranic verses. - Tasbeeh: Implement a digital version of the tasbeeh for users. - E-Commerce: I'd like the app to include e-commerce functionality with the following features: - Product Catalog: A user-friendly display of available products. - Shopping Cart: Users should be able to add items to their cart. - Payment Gateway Integration: Secure integration of a payment gateway for transactions. Target Platforms: - The app should be developed for both iOS and Android platforms. Ideal Skills: - Proficiency in app development for ...

I'm looking for an experienced developer who can create a high-quality app for both Android and iOS platforms. This app offers a comprehensive view of fresh statistical data updated weekly, which has been designed in Figma and now needs to be brought to life. Key Features: - Display of updated statistical data - Interactive charts for an engaging look at the statistics Ideal Freelancer: - Proficient in both Android and iOS development - Experience in translating Figma designs into working apps - Familiarity with data visualization, particularly interactive charts This is not just about coding an app; I need someone who can intelligently implement the design details and make the statistical data immersive and interesting. Let's create an engaging tool together!

...customers. Simultaneously, I want to create an iOS & Android app to expand my market reach. Key Project Details: - Existing Website Enhancements: The current website needs improvements to enhance user experience and functionality. This includes but is not limited to, smoother checkout processes, better load times, and more visually appealing design. - iOS App Development: I'm looking for a skilled developer to design and implement an iOS app that mirrors the website's functionality. The app should be user-friendly and offer a seamless shopping experience for customers. Ideal Skills & Experience: - Proficient in e-commerce website development and design. Experience with platforms like WooCommerce or Shopify would be a plus. - Prior experience in d...

I'm urgently in need of a skilled React Native Developer to design a simple, yet effective iOS application with a primary focus on mental health care. The application must include: 1. User Authentication: An essential feature to personalize and secure user information. Prior experience in user data privacy and security is preferred. 2. Push Notifications: These are crucial to keep our users engaged and updated. Your ability to integrate efficient notification features will be highly valued. The main goal of this application is to aid mental health care, hence any prior experience in healthcare app development will be a distinct advantage. Driven and efficient individuals or teams are encouraged to apply as I am looking to complete this project ASAP.

I need help creating a contract management software. This software is expected to have key features such as: - Document Storage: Easy, systematic and secured storage of all contracts. - Automated Notifications: Efficiency in keeping users up-to-date on contract status. - Reporting & Analytics: Sophisticated tools for generating detailed contract reports and analytics. - Payments Tracking: Ability to track payments stemming from each contract. - Supplier Account Statement: Functionality to maintain and access supplier account statements. - Editing Contracts with Variables: Flexibility to modify contracts with various variables. The software is to be used by a team of 1-10 people, making it important to have multiple levels of access controls. Ideal freelancers should have expe...

The goal is to create a mobile application (ios, android, web) for events management. It will be necessary to develop 4 applications: • Mobile application (users) • Back-end Admin • Back-end Organizer • Ticket scanner

I'm in need of a skilled Androi...need of a skilled Android developer to create a fully functioning mobile application with the following key features. Key Features: - User Profiles: The app should allow users to sign up, create profiles and manage their accounts. - In-App Purchases: The app should have a feature that enables users to make purchases or upgrade subscriptions within the application. - Push Notifications: Implement a system that sends notifications to users' devices even when the app is not open. I'm looking for a professional with extensive experience in Android development and a strong portfolio of previous mobile applications. The ideal candidate should also have a good understanding of user experience and be able to work independently...

I am on the lookout for a profic...able to implement an efficient and secure system where my users can register and login when needed. - Push Notifications: This should be a fully implemented feature, keeping users informed about any updates or promotions. - In-app Purchases: An understanding of creating seamless in-app purchases will be of immense value for this project, to drive a smooth eCommerce experience. Aesthetic: - This project necessitates a minimalistic design, catering to users who value simplicity and function over decoration. Ideal Skills & Experience: - Significant experience with Wix mobile app development - Familiarity with eCommerce apps - Experience implementing user registration, login, push notifications, and in-app purchases - A go...

I am seeking an exceptional iOS app and android developer who can bring my idea to life. The chosen developer should be capable of implementing the following features: - In-app purchases system - Login system - Real-time updates - Users Nearby function My preference is a design that is modern and minimalist. The ideal candidate will be able to provide creative input and suggestions while adhering to this design preference. Proficiency in Swift, knowledge of Apple's design principles and interface guidelines, and experience in designing seamless in-app purchases are essential for this project. Experience with geolocation services for the 'Users Nearby' feature is also a great plus. The app would basically entail user profiles, chat system, subscription, live Geo l...

I'm currently using .NET MAUI 8.0 to develop an educational app. I'm in need of a skilled .NET MAUI Expert to assist me in running the app in release mode specifically in the iOS simulator, focusing on iPhone. Ideal Skills and Experience: - Proficient in .NET MAUI 8.0 - Experienced in running apps in release mode - Prior experience with iOS simulator - Familiar with testing on iPhone

...performance of the redesigned app across various devices and platforms. 5. **Deployment**: Deploy the customized SignalApp on both iOS and Android platforms, following deployment guidelines and best practices. 6. **Documentation**: Provide comprehensive documentation detailing the setup, redesign, and deployment process for future reference and maintenance. **Technologies and Tools:** - Version Control: Proficiency in utilizing version control systems for code management. - Mobile Development: Experience with mobile development frameworks such as Java or Swift for customization and redesign. - Deployment: Knowledge of app deployment processes for both iOS (App Store) and Android (Google Play Store) platforms. **Time Duration:** The project should be completed wit...

I purchased a source code from codester for a mobile application and I'm looking for an experienced app developer to add some new features. Key modifications include: - Integrating a payment gateway into the app - Incorporating the Facebook SDK for enhanced social media functionality The ideal candidate should have: - Extensive experience in mobile app development for both iOS and Android - Previous work on integrating payment gateways and social media SDKs