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We are looking for an experienced mobile app developer or development team to build a new mobile application for a Pilates studio chain in Spain, with 4 locations. The main purpose of the app is to allow members to manage their classes and payments independently, reducing the number of phone calls and manual administrative tasks currently handled by studio partners and instructors. Existing prototype We already have a clickable functional prototype showing the main user flows and screens. Prototype: [login to view URL] The prototype should be used as a reference for the intended user experience and functionality. It does not prescribe the technical architecture. Main functionality The initial version should include: User login and account management. Monthly membership/payment status. Card payments. Payment history. View upcoming classes and calendar. Change a class according to predefined business rules. Cancel a class. Recover a cancelled class within the allowed period. Notify the studio of non-attendance. Display available spaces in classes. Studio announcements and closure/holiday information. Acceptance of studio rules. Push and/or transactional notifications. FAQ/information section. Basic usage analytics. The app is aimed primarily at adult users with different levels of digital literacy, so simplicity, clear navigation and plain language are essential. Important: existing management system Soluna already has a management system behind its current website and mobile application. One of the main objectives of this project is to determine whether the new app can connect to and continue using that existing system. We therefore need the developer to assess: Available API/integration options. Existing booking and class data. User/member data. Payment information. Class changes, cancellations and recovery logic. Authentication. Whether existing data can be migrated to the new application. We would prefer to keep the existing management system if technically feasible, rather than building a completely new administration system. Please clearly identify in your proposal whether your estimate assumes: A) integration with an existing backend/system, or B) development of a new backend/admin system. The technical details of the existing system will be provided during the technical discovery stage. Business rules Some of the main rules include: Class changes/cancellations with recovery are allowed with 24+ hours' notice. With less than 24 hours' notice, the member can notify the studio but does not receive a recovery credit. Recovery credits expire 15 days after the original class. Only genuinely available spaces should be offered. Class capacity is configurable. The system operates across 4 studios. The complete functional specification is available and can be provided to shortlisted developers. What we are looking for We are open to: Flutter. React Native. Native iOS/Android. Other appropriate technologies. Please recommend the technology based on the integration requirements, long-term maintenance and total cost. We are not looking for a simple visual redesign. The important part of the project is the reliable integration between the app and the existing management/payment system. Important future features The following are not part of the initial development scope: AI assistant. WhatsApp/chat support. Advanced conversational support. Additional languages. Saved card details for future payments. These may be considered in a later phase. What we need from your proposal Please provide: Estimated cost and timeline for the initial technical analysis/discovery. Estimated development cost and timeline. Proposed technology and why you recommend it. How you would approach integration with an existing management system. Whether your proposal assumes an existing backend or a new backend. Estimated costs for payment integration. Recurring costs: hosting, third-party services, notifications, maintenance, etc. App Store / Google Play publication costs. Your post-launch maintenance and support model. 2–3 examples of similar applications you have developed, particularly booking, membership, fitness, wellness or payment-based apps. Ownership A very important requirement is that Soluna must retain control of its digital assets. The client must receive access to and ownership/control of: Source code. Code repository. App Store and Google Play accounts. Hosting/cloud accounts where applicable. Databases. APIs and relevant credentials/configuration. Third-party services used by the application. The project should not create dependency on a single developer for future access or maintenance. Please note We already have a functional prototype and a detailed functional specification. We are particularly interested in developers who can analyse the existing technical environment before quoting the final development, rather than simply providing a generic app development estimate. Please explain any assumptions, exclusions or technical uncertainties in your proposal.
Project ID: 40731460
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335 freelancers are bidding on average €3,468 EUR for this job

The real risk here is not the screens — you already have the prototype — it is whether class logic, payments, member data, and availability can be reused safely from the current system without creating sync problems later. I would start with a technical discovery focused on API options, auth flow, booking data structure, cancellation/recovery rules, and whether the existing backend can support a new mobile app cleanly. For this kind of product, I would usually lean toward Flutter or React Native first, but the final recommendation should come after checking the current system. We have handled app and platform work where bookings, memberships, payments, notifications, and admin rules had to stay consistent across multiple locations, and that is exactly the part that needs careful analysis here. Just as important, we are comfortable working in a way where the client retains full control of source code, repositories, cloud accounts, store accounts, and third-party services. To make the estimate precise, I’d like to confirm a few points first: - Does your existing system already expose any API or documented integration method? - Is card charging handled today by Stripe, Redsys, another gateway, or inside the current platform? - Do you want this proposal to cover discovery only first, or discovery plus the initial mobile build estimate in one phased contract?
€2,500 EUR in 21 days
9.6
9.6

A Warm Hello! We are readily available to start working on this project! We would be delighted to partner with you on the development of the Soluna Pilates mobile application for your four-studio network in Spain. We understand that this is not simply a mobile UI development project. The most important part is creating a reliable member self-service application that works correctly with your existing management, booking, membership, and payment infrastructure. Proposed Engagement Phase 1: Technical discovery & integration assessment Phase 2: Final architecture and fixed development scope Phase 3: Flutter iOS + Android development Phase 4: Integration, QA and UAT Phase 5: Store publication Phase 6: Post-launch support We are confident that this approach will give Soluna a simple member experience, reliable booking/payment workflows, and a maintainable application that remains fully under your control. Best regards, Ana
€5,000 EUR in 70 days
10.0
10.0

Greetings from Logictrix! My name is Jas, and I am looking forward to discuss about your app in details over the Chat or Call. We have enough app developers available in team so I can assure you to deliver this project at a fairly low cost with great quality and with a commitment for long term support. *** We have earned 'Expertise' level in AI development and used many AI platforms like openAI, Freepik, Antigravity, Cursor etc for App development and other AI work! *** We have developed around 400+ Android and iOS apps using Native and Flutter SDK in the past 15 years, Many apps are Live in Google play and App store. We will share our detailed portfolio over the Chat once we connect. Looking forward to your reply... Thanks and Regards Jas
€2,500 EUR in 30 days
9.7
9.7

Hello, I am Dr. Rajesh Rolen, PhD in Computer Science & Engineering, with experience of over 20+ years in Android, API Integration, Flutter, Mobile App Development, React Native, iPhone, Backend Development, HTML, Payment Gateway Integration As a preferred freelancer in the top 1%, I have done 400+ projects here on freelancer.com, I have 4.9 ratings out of 5 on average, which showcases my quality of work and timely delivery. Key Highlights: - Free Hosting Support on the Cloud or any desired platform. - Free 3 months of post-delivery support to ensure that our client doesn’t face any challenges after the launch of the project. - Free Dedicated tester on projects to ensure quality delivery, so clients don’t need to act as a tester. - 10+ Years experience UI/UX team to ensure intuitive UI. Portfolio: https://www.freelancer.com/u/Microlent Please open the chat and send me a message, so we can have a more detailed discussion about the project to give you the project timeline and cost. Thank you for considering my services. I look forward to engaging in a productive conversation and understanding how I can be of assistance in bringing your project to life. Regards Rajesh Rolen
€4,300 EUR in 90 days
9.4
9.4

Hi there, We understand you're looking to develop a mobile app for managing a Pilates center with multiple locations in Spain, aiming to reduce manual administrative tasks and enhance member experience. The app should allow users to manage classes, payments, and more, with a focus on simplicity and clear navigation. With our 17 years of experience in mobile development, including projects like a music voting mobile app using React Native and a furniture store mobile shopping app using Flutter, we believe Webbook Studio is well-equipped to handle this project. Our team has expertise in React Native, Flutter, and native iOS/Android development, and we can recommend the best technology based on your integration requirements and long-term maintenance needs. We propose starting with a technical analysis/discovery phase to assess the existing management system, API/integration options, and determine the feasibility of connecting the new app to the existing system. Our estimate assumes integration with an existing backend/system, and we will provide a detailed breakdown of costs, including payment integration, hosting, and maintenance. Some of our similar projects include a learning platform website for children and an online shop for a Scandinavian fashion brand, both of which involved complex payment integrations and custom design. Can you please provide more details about the existing management system and the technical specifications you
€2,650 EUR in 30 days
9.1
9.1

With over a decade of experience in full-stack architecture and high-scale systems, I understand your goal of developing a mobile app for Pilates center management. Having successfully built and scaled Telegram Mini Apps serving over 1 million users, I am well-equipped to tackle the complexities of this project, especially in terms of integrating with existing backend systems and ensuring seamless user experience. One strategic insight I offer is to prioritize API/integration assessment upfront to streamline the development process. My past success in handling high-security FinTech systems proves my ability to navigate the technical nuances involved in connecting to existing data and systems, as required by your project. I encourage you to reach out to discuss how we can align on the roadmap for this project. Let's collaborate to bring your vision to life seamlessly and efficiently.
€4,000 EUR in 45 days
8.8
8.8

Hello, I am interested in developing your Pilates studio management app. Given the scope, I recommend using React Native for its cross-platform capabilities, which will reduce development time and costs while ensuring a smooth user experience. My approach involves first conducting a detailed technical analysis to assess existing system integration options, followed by phased development to incorporate core features such as user login, class management, and payment processing. I have extensive experience with API integration and mobile app development, which aligns well with your project needs. I will ensure seamless integration with your existing management system, whether by connecting to current APIs or developing new ones if necessary. The initial analysis and discovery phase will cost approximately 700 EUR, with the subsequent development estimated at around 2800 EUR. I aim to deliver within 45 days, with the first milestone at 20% upon completion of the analysis. I look forward to helping you create a reliable, user-friendly app that meets your business goals. Best regards, SYMLINK TECHNOLOGIES LLP
€3,500 EUR in 45 days
8.5
8.5

Hello, I’d be pleased to help Soluna move from its functional prototype toward a reliable Pilates management app. I would begin with a focused technical discovery of the existing booking, membership, payment, authentication, and notification systems, then recommend Flutter, React Native, or native development based on integration feasibility and long-term ownership. My estimate would assume integration with the existing backend where practical; a new backend/admin system would be scoped separately. I also recommend validating class-capacity and 24-hour recovery rules through end-to-end testing before launch. I will structure delivery so Soluna retains the repository, accounts, credentials, databases, and third-party service ownership, with transparent assumptions, recurring costs, publication requirements, and post-launch support clearly documented. Check out my portfolio here:- https://www.freelancer.com/u/installerpoint Best Regards, Muhammad Adeel
€4,165 EUR in 13 days
8.0
8.0

Hi, Dheeraj here from Dezinestar. I understand Soluna needs a simple, reliable member app for four Pilates studios, with bookings, class changes/cancellations, recovery credits, membership/payment status, notifications, announcements, and analytics. Our approach would start with a technical discovery of the existing management system, APIs, authentication, booking logic, member data, and payment flow before finalising the development estimate. Our initial proposal assumes A) integration with the existing backend/system, provided the required APIs are available. We can recommend Flutter, React Native, or native development after assessing the integration and long-term maintenance requirements, while keeping all source code, repositories, accounts, credentials, and infrastructure under Soluna’s control. Q1 – Can you share the functional specification and details of the existing management system/API during discovery? Q2 – Which payment provider is currently used for memberships and card payments? Q3 – Do you already have active Apple Developer, Google Play, cloud, and notification service accounts? We can provide separate discovery and development estimates, including timeline, payment integration costs, recurring services, publication, and post-launch support. Happy to review the prototype and technical environment through Freelancer chat/audio call.
€2,500 EUR in 10 days
8.3
8.3

Hello, I checked your "Development of a Mobile App for Pilates Center Management" project description, it looks like the focus is on delivering a clean, responsive website that works well across all devices. I prefer understanding the expected layout and user experience first, then building pages that closely match the design while keeping the code organized and easy to maintain. Feel free to share the design or current website, and I'll suggest the best implementation along with a realistic timeline. Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.
€3,000 EUR in 134 days
7.9
7.9

Hey, The success of this app will depend heavily on how well it connects with your existing management system, so the smartest first step is understanding that system before committing to the full build. I’d assess its API, authentication, booking logic, member data, and payment flow first. If it can support the required workflows, integrating with it will avoid duplicated administration and give all four studios one reliable source of truth. I’d start with a focused technical discovery of the existing backend, then recommend Flutter, React Native, or native development based on the actual integration, performance, and long term maintenance requirements. From there, the initial app can focus on the member journey including payments, class booking, cancellations and recovery, availability, notifications, and account management, with the 24 hour and 15 day rules enforced securely on the server side. My proposal assumes integration with the existing backend (A), subject to confirming its capabilities during discovery. I can also show you similar booking and membership app examples in chat so you can see how I’d approach the member experience. I’d structure the project so Soluna retains full ownership of the repository, accounts, infrastructure, credentials, and source code from the beginning. Portfolio: https://www.freelancer.com/u/Hammadhassan21 Best regards, Hammad Hassan
€3,000 EUR in 20 days
7.9
7.9

Hello, I can help structure the technical discovery and development plan for Soluna’s Pilates management app, using your existing prototype and functional specification as the starting point. I would first assess the current booking, membership, payment, authentication, notification, and class-recovery systems before recommending Flutter, React Native, or native development. My proposal assumes integration with the existing backend/system where APIs and data access are feasible, rather than automatically creating a new administration platform. The discovery stage would document integration constraints, migration needs, recurring service costs, store publication requirements, ownership safeguards, and a realistic implementation estimate. I would also recommend contract-based API boundaries and client-controlled repositories, cloud accounts, credentials, and store accounts to prevent vendor dependency. I can provide a clear phased plan covering discovery, development, testing, launch, and post-launch support, with assumptions and exclusions stated upfront. Regards Muhammad
€4,165 EUR in 8 days
8.1
8.1

Flutter | Mobile App Development | Booking Systems | Payment Integration Hi, Thanks for sharing the details. I can help build your Pilates app with a simple, user-friendly experience for members across all four studios. My recommendation is React Native for a single codebase supporting iOS and Android, with easy long-term maintenance. Payment gateway fees, hosting, and store account fees would be additional. Soluna would retain ownership of the source code, repository, and digital accounts. I can provide ongoing maintenance and support after launch. The final estimate would depend on the existing system’s API capabilities and payment setup. Thanks! Purnima
€3,750 EUR in 20 days
8.2
8.2

Hi there, I have over 20 years of software experience, including 12+ years building iOS and Android apps and extensive Flutter, backend, API, database, booking, and payment work. I understand Soluna needs more than a new interface: members must reliably manage classes, credits, attendance, payments, and studio communications while reducing manual work across four locations. I recommend Flutter for one maintainable iOS/Android codebase, subject to the integration findings. I would begin by auditing the existing system: authentication, member and class data, availability, booking rules, payment status, cancellation/recovery logic, and API options. My estimate assumes integration with the existing backend where practical, not replacement with a new administration platform. Any missing capabilities would be isolated and documented before implementation. The app would use clear navigation and simple language, with server-side validation for capacity, notice periods, and expiring credits. Payments and notifications would be integrated through established providers, with recurring third-party and maintenance costs identified during discovery. Soluna would retain ownership of the repository, accounts, infrastructure, data, credentials, and release assets. I can also provide relevant booking and payment application examples and discuss a practical post-launch support model.
€4,000 EUR in 30 days
7.9
7.9

Hello, We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time. We are 25 years in this business and our technical specialists have strong experience in Mobile App Development, iPhone, Android, HTML, Payment Gateway Integration, Backend Development, React Native, Flutter, API Integration, AI Mobile App Development and other technologies relevant to your project. Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews. Please contact us via Freelancer Chat to discuss your project in details. Best regards, Sales department Tangram Canada Inc.
€3,672 EUR in 5 days
8.7
8.7

Hello, Greetings Hope you are doing well. I am a Mobile Application developer with over 5 years of experience. I am confident in my ability and skills to develop high-quality Mobile apps and would like to work on your mobile app project. I will complete the work as per your requirements. I want to discuss more this project to prepare the final concept. So let’s discuss this in detail over chat then will make plans to start work on it. Waiting for your earliest reply. Thanks. Shubham
€2,500 EUR in 24 days
8.0
8.0

What stands out here is the operational logic behind each class action: 24+ hour recovery rules, expiry windows, true availability, multi-studio capacity, and payment state all need to stay consistent. That means the success of this app depends far more on backend assessment and integration design than on rebuilding the prototype screens. I’d approach this in two stages: first, analyse the current system and confirm what can be reused; second, build the mobile app on top of that architecture with clean member flows and simple language for less technical users. We’ve handled booking/member journeys where the difficult part was preserving business rules and reducing admin work, which is exactly the pressure point in your brief. This estimate assumes option A first: reuse of the existing system where technically viable, with a separate quote only if a new admin/backend becomes necessary. - Is the current website/app vendor still available to provide API docs or database structure during discovery? - Should notifications include both transactional events and studio-wide announcements from day one? - Do you want the initial release to support Spanish only, with structure kept ready for future multilingual expansion?
€3,750 EUR in 5 days
7.8
7.8

I can turn the existing Soluna flows into a production-ready Flutter app for iOS and Android, while first validating whether your current management system can remain the backend. I would begin with a focused technical discovery covering APIs, authentication, members, bookings, payments, class capacity, cancellations/recovery, and data migration. If the existing system supports the required workflows, I will integrate it rather than unnecessarily rebuilding your backend. The app will include membership/payment status, card payments, class management, recovery credits, notifications, announcements, FAQs, and analytics with a simple UX for all age groups. Discovery: 3–5 days | Development: ~6–8 weeks after API validation Architecture: Flutter + existing backend where feasible Backend assumption: Existing system integration preferred; new backend only if required. Quick Questions Can you provide the existing management system/API documentation during discovery? Which payment provider is currently used for memberships and card payments? I will keep Soluna fully in control of the source code, repositories, accounts, hosting, APIs, and credentials, with no developer lock-in after launch.
€4,500 EUR in 55 days
7.4
7.4

Hello dear sir, I have 10+ years of mobile app experience and strong skills in Flutter. I can build your Pilates app with smooth API integration and can also work with React Native or native iOS/Android. I focus on simple, reliable and user-friendly apps. I can safely migrate your existing system, check the APIs and make sure your data stays secure with no data loss. I can build features like accounts, payments, and class scheduling with clear navigation. I can also support future features like AI assistants and multiple languages as your app grows. To review the quality of my work, I invite you to visit my Freelancer profile at the link below: https://www.freelancer.com/u/p4logics I would be happy to discuss your project requirements in detail and am available to begin work immediately. I look forward to hearing from you. Best regards, Deepak
€5,000 EUR in 56 days
7.5
7.5

Hello, I’m a mobile and full-stack developer with 10 years of experience building booking, membership, payment, and business management applications using React Native, Laravel, Node.js, MySQL/PostgreSQL, and REST APIs. For Soluna, I recommend React Native for a maintainable iOS/Android application with a shared codebase. My proposal assumes integration with the existing backend/system, subject to the technical discovery confirming API availability and the existing authentication, booking, membership, and payment workflows. I would first audit the current system and prototype, map APIs/data/business rules, and identify any integration gaps before finalizing development estimates. The app would include secure authentication, real-time class availability, booking changes/cancellations, recovery credits, payments, notifications, and a simple responsive interface. I would also ensure Soluna retains full ownership of the repository, source code, accounts, infrastructure, databases, and integrations. Best regards
€2,500 EUR in 7 days
7.1
7.1

A Coruña, Spain
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