Android App: Auth & Purchases -- 2

@GameOfWords

As an AI Mobile & Web Developer with years of experience building Android apps, your project aligns perfectly with my skill set. I have a deep understanding of Android App Development, Backend Development, and Mobile App Testing which would ensure that your app meets all requirements and performs seamlessly. With regards to secure user authentication, I am familiar with modern approaches such as JWT or Firebase Auth which also respects Google’s security guidelines. For in-app purchases, I'm skilled at creating native and frictionless flows with validation both on the client and server sides. Lastly, regarding push notifications. I have the expertise to make them timely, configurable and optimally using FCM for segmented or broadcast messaging. Time efficiency is one of my strong points; by considering the complexity of your task and my past experience in such projects, I believe we can get your app up and running within a realistic timeframe. Let's chat details, get started and create an app that not only meets your requirement but exceeds your expectations.

@adityakhuman006

With your project centered around robust security, seamless in-app purchases, and efficient push notifications, my depth of experience in mobile app development, particularly in the Android environment, makes me an outstanding fit for your needs. I am well-versed with modern authentication approaches like JWT and Firebase Auth that are integral to ensuring your users' data is reliably protected while adhering to Google’s latest security guidelines. My proficiency extends beyond the code; crafting clean, well-structured, scalable code ensures not only a fast and efficient app but also saves time for any potential future modifications or additions you may require. I appreciate and understand the value of maintaining a highly modular and scalable codebase. Moreover, my immense experience with APIs will be detrimental to seamless integration of necessary functionalities such as payment gateways --a vital aspect of your project. Your deadline is important to me too, which is why I will bring my proven expertise and thorough understanding of app development to provide you with accurate estimations on timing and successfully meet all the acceptance criteria. Let's make this happen

@webdev1802

Hello, I’ve reviewed your requirements closely, and this is exactly the kind of end-to-end Android build where architecture and execution matter more than just adding features. The biggest risks in apps like this are weak auth flows, unreliable purchases, and push notifications failing in real-world states — and those are the areas I prioritize first. I’d approach this as a production-grade Android app from day one, using modern, Google-compliant practices. Authentication would be implemented with Firebase Auth or JWT-based auth, depending on your backend preference, with proper token handling, refresh logic, and security hardening aligned with current Play policies. For in-app purchases, I’ll implement Google Play Billing (latest version) with client-side handling and server-side receipt validation to ensure purchases are secure, verifiable, and resilient to edge cases. The flow will feel fully native and transparent to users. Push notifications will be built using FCM, supporting both segmented and broadcast messaging, and tested thoroughly across foreground, background, and terminated states to ensure delivery reliability. I’ve shipped Android apps with this exact feature set and can provide a realistic timeline with milestones covering architecture, implementation, testing, and Play Store release. If you want someone who takes responsibility from first commit to closed-track approval, I’m ready to start.

@softandrew

Hello, I’ve shipped multiple production Android apps covering Firebase Auth/JWT, Google Play Billing, and FCM. I propose Kotlin, MVVM, Clean Architecture, REST backend, CI-tested and linted. Timeline: 6–8 weeks from architecture to Play Store release, including testing, optimisation, and full source-code handover. Experienced with scalable APIs, secure purchases, and Material UI.

@QuickMentor

As a seasoned full-stack developer with a 5-star rating and over 4+ years of experience, I've successfully built and launched numerous mobile applications and websites that demanded similar high-level features. My fluency in Android App Development coupled with sharp skills in backend programming such as Java gives me the ability to build scalable, well-designed applications from the ground up. In addition, your requirement for JWT or Firebase Auth fits well with my expertise since I have hands-on experience integrating modern authentication techniques. My proficiency extends into ensuring smooth in-app purchases and effective push notifications. With my 100% job success score on these tasks, I can confidently navigate the complexities of Google Play in relation to test purchases processing and fine-tuning push notifications' timing and segmentation using FCM. Completing tasks with meticulousness is my norm; thus you can rest assured that password-reset journeys or authentication pathways will be designed robustly, verified thoroughly on real devices before shipping. Allow me to put my skills and experience at your service to deliver a proficient Android application!

@mayankinnovative

Hello, Challenge Overview: Users need a simple mobile solution to book gym slots, manage availability in real time, and complete secure payments without confusion or double bookings. Implementation Approach: I will build a cross-platform mobile app (Flutter or React Native) for iOS and Android with time-slot based booking. The app will include user registration/login, live slot availability, booking confirmation, and integrated payments (Stripe / Razorpay / in-app payments as required). An admin panel will allow gym owners to manage slots, pricing, and user bookings. APIs will ensure real-time sync so once a slot is booked, it’s instantly locked for others. Final Outcome: You will get a clean, easy-to-use gym booking and payment app where users can reserve time slots in seconds, payments are processed securely, and gym staff can manage schedules effortlessly. The app will be scalable, stable, and ready for App Store and Play Store launch. Software I create balances performance and maintainability, honed over 15+ years. Thank you

@khushiArt

Hello, Hope you are doing well. I have experience of 6+ years of in Mobile Applications Development and I have previously made many applications with Interactive Designs and Functionalities. I have reviewed your requirement. I will definitely design & develop a fully responsive & user-friendly application. However, I would like to dig more into your requirements to develop a unique application as per your desires App development:- Olx App Taxi App Dating App. Educational App Multivendor App. Hotel and Restaurant Booking App. Doctors/ hospital management App. Please have a look at my portfolio link : https://www.freelancer.com/u/khushiArt Best Regards Khushbu

@RyanKrause

Starting with secure user authentication and smooth in-app purchases shows a clear focus on stability and user trust. I keep projects grounded by maintaining steady communication and setting clear checkpoints that allow for adjustment as the scope refines. I value predictable delivery while ensuring the architecture supports scale and modularity. Before confirming timelines or cost, aligning on backend preferences and subtle UI nuances would be crucial. While I’m new to Freelancer, this isn’t a new challenge—I’ve delivered similar apps elsewhere with Firebase Auth and REST backends, balancing performance and clean design. What’s your biggest priority in balancing feature depth versus streamlined user experience? Cheers, Ryan

@rainbowarts

Hello, I can build your production-ready Android app end-to-end, including secure authentication, in-app purchases, and push notifications, and prepare it for Google Play release. Approach Android (Java/Kotlin-ready MVVM architecture) Secure auth (Firebase Auth or JWT) Google Play Billing (latest library, fully tested) FCM push notifications (foreground, background, killed state) Clean Material UI and scalable backend integration Deliverables Store-ready APK/AAB Tested auth, purchases, and notifications Clean, commented source code in private Git repo README with setup and deployment steps I’ve delivered multiple Android apps with these exact features and can start immediately. Best regards, Shailendra!

@borisb35

You require a secure, scalable Android app featuring robust authentication, seamless in-app purchases, and reliable push notifications from architecture to Google Play release. I’m Boris, an Android developer with 6+ years specializing in Kotlin, Firebase Auth, Google Play Billing, and FCM integration. I’ve delivered similar apps using Firebase Auth for security, Google Play Billing for smooth purchases, and FCM with segmented messaging—resulting in high user retention and zero critical bugs (portfolio available on request). I will refine your wireframes into a clean Material UI, implement Firebase Auth with JWT fallback, integrate Google Play Billing with server validation, configure FCM notifications, test all flows on devices, and deliver well-documented code within 6 weeks. My approach prioritizes modular, performant code and professional testing ensuring your app meets all acceptance criteria reliably. Let’s chat to finalize requirements and kick off development immediately.

@shnaiky

This project fits my experience very well. Your need for a clean, professional, and user-friendly Android app with secure authentication, seamless in-app purchases, and reliable push notifications aligns perfectly with my skills. I understand the importance of rock-solid authentication using JWT or Firebase Auth, native-feeling purchase flows with client-server validation, and timely, configurable FCM messaging. I specialize in building modular, scalable Android apps with Material Design compliance and well-structured REST or GraphQL backends. While I am new to freelancer, I have tons of experience and have done other projects off site. I would love to chat more about your project! Regards, Muhammed Talha Shaikh

@rohitv622

Hello Sir, I have experience in Python automation and AI-based projects. I have already built projects like Eye Controlled Virtual Mouse and Voice Controlled Robot. I can complete your work on time with full support. Let's discuss details. Thank you Rohit

@LukeKenyon

I am confident I can deliver exactly what you’re looking for by adhering strictly to your stated requirements and scope, particularly ensuring "Login, sign-up, and password-reset journeys verified on real devices" are robust and seamless. My approach centers on precise execution and clear alignment with your defined scope—no assumptions or shortcuts. This guarantees secure authentication implementation, flawless in-app purchase flows, timely push notifications, and comprehensive testing. Although I am new to Freelancer, I bring strong real-world experience and have completed many projects off this platform. I’d be happy to discuss the details whenever you’re ready. Regards, Luke Kenyon

@keaganhaynes14

I am a perfect fit for your project. I understand the critical need for secure user authentication using modern solutions like Firebase Auth or JWT, alongside seamless in-app purchases and reliable push notifications via FCM, integrated into a fast, modular, and scalable Android application. I bring extensive hands-on experience designing and deploying Android apps with clean, professional, and user-friendly interfaces that adhere to Material Design principles. While I am new to Freelancer, I have extensive real-world experience and have completed multiple projects off the platform involving authentication flows, payment integration, and notification management. I focus on delivering automated testing, code linting, and comprehensive documentation to ensure maintainability. Could you please clarify your preferred backend technology—REST or GraphQL—to align the architecture accordingly? I would love to chat more about your project! Regards, keagan

@LukeHattingh

I have recently completed a project like this, which gives me confidence in delivering strong results for you. I love your idea of building a secure, scalable Android app with smooth in-app purchases and reliable push notifications, and I see this project as an ideal match for my expertise. My skills include Firebase Authentication, Google Play Billing integration, FCM push notifications, and designing modular, maintainable codebases. While I am new to freelancer, I have tons of experience and have done other projects off site. I’m excited to contribute at a discount to build my reputation. When will our journey begin? Luke H.