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I own an issued patent for a per-diem payment-card system and now need a production-ready mobile app that turns that IP into a working product. The application must run natively on both iOS and Android and its primary job is to let a company create and instantly issue virtual (and later physical) per-diem cards to employees. Core flow • Company registers an account (email + password). • Admin loads funds and defines per-diem limits. • The app generates a virtual card for each employee and displays card details securely. • Real-time balance updates and basic transaction history appear in the employee’s view. Key requirements • Secure email/password authentication for both admin and employee roles. • Card-issuing integration with a platform such as Stripe Issuing, Marqeta, or a comparable PCI-compliant service—open to your recommendation. • Clean, intuitive UI following Apple Human Interface & Material Design guidelines. • Scalable backend (Node, Django, or similar) with encrypted storage of sensitive data. • Source-controlled codebase, build scripts, and a brief hand-over video. Deliverables 1. Fully functional iOS and Android apps (ready for TestFlight / Play Console). 2. Backend source and deployed staging server. 3. Minimal admin web panel to review accounts and manually override card settings. 4. Technical documentation covering setup, APIs, and patent-specific logic. Acceptance I will consider the project complete once I can: • Create an account, issue a test card, and view it on both platforms. • Confirm that all traffic is encrypted and that only authenticated users reach protected endpoints. If this matches your expertise in mobile fintech builds, let’s discuss timeline and suggested architecture.
Project ID: 40532634
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251 freelancers are bidding on average $518 USD for this job

Hi — Elias here from Miami. I see you're looking to develop a mobile app for your per-diem payment-card system. This is an innovative concept that can simplify expense management. The real technical challenge often revolves around ensuring robust security and seamless integration with payment gateways. A common issue in systems like this is maintaining a reliable user experience while managing sensitive financial data. The tricky part is ensuring smooth scalability as your user base grows. My approach would involve designing a modular architecture that emphasizes security, maintainability, and future-proofing. I would prioritize a solid backend using Node.js to handle transactions efficiently and ensure data integrity. This way, the app can evolve without significant overhauls as new features are added. I have worked on finance-related applications that required stringent security protocols and user-friendly interfaces, so I'm familiar with the challenges and best practices. A few questions to better understand the scope: Q1 – What specific user roles and permissions do you envision for the app? Q2 – Are there particular payment gateways you prefer to integrate with? Q3 – What is your target timeline for the first version launch? Happy to discuss further and suggest the best technical approach. Looking forward to hearing from you.
$500 USD in 5 days
8.4
8.4

Hello, Per Diem Card FinTech Mobile Applications {{{ I HAVE CREATED SIMILAR APPS BEFORE AND I CAN SHOW YOU }}}} I have carefully reviewed your requirements and understand that you are looking to transform your patented per-diem payment card system into a secure, production-ready fintech platform with native mobile applications, virtual card issuance, fund management, employee controls, and real-time transaction visibility. I have 10+ years of experience in FinTech applications, mobile app development, payment integrations, secure backend systems, API development, and enterprise-grade platforms, I am confident in delivering a scalable solution that aligns with your patent requirements and business objectives. I can help build native iOS and Android applications along with a secure backend and admin portal, enabling company registration, employee management, per-diem allocation, virtual card issuance, balance tracking, transaction history, and administrative controls. For card issuance, I can integrate with providers such as Stripe Issuing, Marqeta, or other PCI-compliant platforms based on your target market, compliance requirements, and operational goals. I WILL PROVIDE 2 YEARS OF FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE. I eagerly await your positive response. Thanks, Christina
$250 USD in 7 days
8.4
8.4

With over a decade of experience in mobile fintech builds and high-security systems, I understand your need for a production-ready mobile app for your per-diem payment-card system patent. My background in developing high-complexity systems, such as scaling for over 1 million users, directly applies to the challenges of turning your IP into a working product. A strategic insight for ensuring scalability and security in this project is to integrate a PCI-compliant card-issuing service like Stripe Issuing or Marqeta. With my successful track record in building and scaling applications, including handling real-time balance updates and secure transaction history, I am confident in delivering a solution that meets your requirements. I encourage you to reach out to discuss the roadmap for the Per Diem Card App Development project. I am eager to collaborate on creating fully functional iOS and Android apps, a scalable backend, and a user-friendly admin web panel, all while ensuring the security and functionality of your patented system.
$600 USD in 20 days
8.3
8.3

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 personal diem card 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
$250 USD in 14 days
8.0
8.0

Hi, I know you need a secure fintech mobile app that turns your per-diem card patent into a real working product where companies can issue virtual cards, fund wallets, and manage employee spending in real time, and I promise you will be happy with the result. If not, you do not pay. I will also provide three months of free maintenance after launch. I can build a full iOS and Android app with company onboarding, employee card issuance, real-time balance updates, and transaction history, all wrapped in a clean and secure user experience. The system will follow Apple HIG and Material Design, with a minimal admin panel and secure API architecture ready for production and future scaling. Please check out my profile to review my past projects and portfolio: https://www.freelancer.com/u/Hammadhassan21 I am available to start immediately. Ping me to discuss the architecture and timeline and get started. Thanks.
$500 USD in 7 days
7.3
7.3

Hi I have strong experience building secure fintech-style mobile apps with iOS/Android, Node.js/Django backends, PostgreSQL, encrypted APIs, RBAC, admin panels, and payment/card issuing integrations. The main technical challenge is issuing and displaying virtual card data securely while staying aligned with PCI-compliant provider rules and avoiding unsafe storage of sensitive card details. I will solve this by integrating Stripe Issuing, Marqeta, or a comparable provider using tokenized card data, secure backend authorization, encrypted transport, audit logs, and role-based access for company admins and employees. For the backend, I would design company accounts, employee users, per-diem limits, card policies, funding events, balances, transaction sync, and webhook handling as scalable modules. The mobile apps can include secure login, employee card view, real-time balance updates, transaction history, and clean UI following Apple and Material Design standards. I can also build the admin web panel for account review, manual overrides, card controls, and operational visibility. The implementation will include source control, build scripts, staging deployment, API documentation, and technical notes covering the patent-specific per-diem logic. My focus is to deliver a secure, production-ready foundation that can support virtual cards first and physical card workflows later. Thanks, Hercules
$500 USD in 7 days
7.0
7.0

—>> Per-Diem Virtual Card Mobile App Development <<— Hello, I’ll develop a secure, production-ready fintech platform that transforms your patented per-diem card system into a fully functional iOS and Android application with card issuance, fund management, and real-time transaction tracking. Key Features * Native iOS & Android Applications * Company Registration & Authentication * Admin & Employee Role Management * Secure Email/Password Login * Per-Diem Limit Configuration * Virtual Card Generation & Management * Stripe Issuing / Marqeta Integration * Real-Time Balance Updates * Transaction History & Activity Logs * Secure Card Detail Display * Admin Web Dashboard * Card Controls & Manual Overrides * Funds Management System * RESTful API Development * Encrypted Data Storage * PCI-Compliant Architecture * JWT & Role-Based Security * Audit Logs & Monitoring * Scalable Cloud Infrastructure WITH 3 MONTHS FREE SUPPORT AFTER DEVELOPMENT READY TO START WORK IMMEDIATELY!!!!! LET'S CHAT … Thanks
$250 USD in 7 days
7.3
7.3

Hello, I have 10+ years of experience building secure web and mobile applications, including fintech, payment processing, digital wallet, and card-management platforms using React Native, Node.js, Laravel, PostgreSQL, and cloud infrastructure. Your per-diem card platform requires both strong product architecture and security-focused development. I can build native-quality iOS and Android applications using React Native, along with a scalable backend that integrates with card-issuing providers such as Stripe Issuing or Marqeta. The solution will support company onboarding, employee management, virtual card issuance, funding controls, transaction history, balance tracking, role-based access, and a secure admin portal. Security will be a top priority, including encrypted communication, secure authentication, protected APIs, audit logging, and PCI-compliant integration practices. The architecture will also be designed to support future physical card issuance, advanced spending controls, and additional enterprise features. I can deliver the mobile apps, backend services, admin panel, documentation, deployment setup, and handover materials required for a production-ready launch. Best regards
$250 USD in 7 days
7.0
7.0

Hello, I understand you need a native iOS and Android fintech app that lets companies register, load funds, define per-diem limits, issue virtual employee cards, and show secure card details, balances, and transaction history. I have experience building secure mobile fintech platforms with role-based authentication, encrypted backends, admin panels, payment/card API integrations, transaction dashboards, staging deployments, and TestFlight/Play Console preparation. I would recommend Flutter or React Native with a Node.js/Django backend, PostgreSQL, encrypted secrets storage, and Stripe Issuing or Marqeta integration, delivered through milestones for auth, card issuing, funding/limits, employee views, admin controls, QA, documentation, and handover. Q1: Do you already have approval or sandbox access for Stripe Issuing, Marqeta, or another card issuer? Q2: Should the MVP support virtual cards only, with physical cards planned later? Q3: Do admins need funding through ACH/card payments in MVP, or can balances be manually loaded for testing? Best regards.
$500 USD in 7 days
6.6
6.6

Hi, We’ve developed multiple mobile apps for fintech startups, including a wallet app that lets users create virtual cards for online payments. We also built a web app for admins to manage users and cards, and integrated with Stripe and Payoneer for KYC and fund transfers. We can use our existing code to speed up development and deliver a fully compliant product. We also have a dedicated team of UI/UX designers who can create a modern, user-friendly interface. Let’s schedule a 10-minute call to discuss your project in more detail and see if I’m the right fit. I usually respond within 10 minutes. I’m eager to learn more about your exciting project. Best regards, Adil
$477.15 USD in 7 days
6.7
6.7

Hi There!!! ★★★★ ( Cross-platform fintech app with secure virtual card issuing and real-time balance tracking ) ★★★★ I've carefully reviewed your project and understand that you need a production-ready iOS and Android application that transforms your patented per-diem card system into a secure, scalable product. The platform will support company registration, employee card issuance, balance tracking, transaction history, and an admin panel for management and overrides. ⚜ Cross-platform iOS & Android app development ⚜ Secure admin and employee authentication ⚜ Stripe Issuing / Marqeta integration guidance & implementation ⚜ Real-time balance and transaction tracking ⚜ Scalable backend with encrypted data storage ⚜ Admin web dashboard for account management ⚜ Documentation, deployment, and hand-over support My approach would be to use Flutter for rapid cross-platform delivery, Node.js for a scalable backend, secure JWT authentication, encrypted storage, and PCI-compliant card issuing integrations. I'll provide frequent updates, clean source code, staging deployment, and a smooth handover process. I would be glad to discuss your patent-specific requirements, recommended architecture, and project timeline in more detail. Looking forward to hearing from you soon and helping bring this product to life. Warm Regards, Farhin B.
$256 USD in 10 days
6.6
6.6

Hi, I’ve gone through your requirements and I understand this is not a simple mobile app—it’s a fintech product built around your issued patent, where the core value is secure per-diem card issuance, real-time balance visibility, and a clean admin-controlled funding system. I can help you turn this into a production-ready cross-platform app (iOS + Android) with a proper backend architecture and secure card-issuing flow using a PCI-compliant provider like Stripe Issuing or Marqeta, depending on what fits your region and compliance needs best. My approach would be to build a secure backend (Node or Django) with role-based access for admin and employees, then connect it to a mobile app built in Flutter or React Native for faster cross-platform delivery. The system will be designed so sensitive data is never exposed on the client side, and all card operations happen through secure APIs only. I’d be happy to discuss the details further and answer any questions you may have. Feel free to send me a message, and we can get started right away. Thanks.
$500 USD in 7 days
6.4
6.4

This is a strong fintech MVP because the core value is clear: companies can issue controlled per-diem cards instantly, while employees get secure card access, balances, and transaction history. I'm Dimitar, a senior full-stack/mobile developer with experience building secure mobile apps, backend APIs, admin panels, payment integrations, authentication, and scalable fintech-style systems. For this project, I would recommend a cross-platform native-quality app using Flutter or React Native, with a Node.js or Django backend, PostgreSQL, encrypted data storage, and integration with a PCI-compliant card issuing provider such as Stripe Issuing, Marqeta, or a similar platform depending on availability and compliance requirements. I can deliver: • iOS and Android apps ready for TestFlight / Play Console • Admin and employee authentication • Company account setup and per-diem limit management • Virtual card issuing integration • Real-time balances and transaction history • Minimal admin web panel • Secure API, protected endpoints, staging deployment, documentation, and handover video I would also ensure sensitive card data is handled through the issuing provider’s secure components rather than stored directly in the app. — Dimitar
$500 USD in 7 days
6.3
6.3

Hi I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native, and for web and backend on react js and node js, Python Django and php CodeIgniter mvc and Laravel. Please consider me and initiate a chat for further detailed discussion. Regards, Anju
$500 USD in 14 days
6.6
6.6

Hello, I hope you are doing well. I understand that you are looking to build a MOBILE APPLICATION, and I would be happy to help. I have extensive experience in designing and developing applications and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.
$250 USD in 5 days
7.0
7.0

I see you're looking to develop a mobile app for your per-diem payment-card system. That's a unique concept with great potential. With around 10 years of experience in mobile app development, I’ve built numerous apps on both iOS and Android platforms, using technologies such as Objective C and Node.js. Your goal of creating a production-ready app aligns well with my background, as I've worked on projects that needed to meet strict production standards. Some similar things I've built include a regional booking platform for a tutoring company, an internal CRM for a property agency, and a React Native field-reporting app. Let’s connect and discuss how we can turn your vision into a reality. Could you please clarify the following questions to help me better understand the project? Q1: What specific features do you envision for the app to enhance user experience? Q2: Are there any particular design guidelines or branding elements that need to be incorporated? Q3: What security measures are you considering for handling sensitive payment information?
$500 USD in 6 days
6.6
6.6

Hi, We reviewed your requirements and understand that this is not a typical fintech application. The core challenge is transforming an existing patented per-diem card concept into a secure, scalable product that allows companies to issue and manage employee spending cards while maintaining compliance, security, and a seamless user experience. Our approach starts with validating the card-issuing workflow, user roles, and compliance requirements before moving into development. We'd recommend a React Native application for iOS and Android, supported by a secure backend and a PCI-compliant issuing provider such as Stripe Issuing or Marqeta, depending on business and geographic requirements. Our process includes: • Product & Architecture Planning • React Native App Development (iOS & Android) • Admin & Employee Role Management • Card Issuing & Funding Integration • Real-Time Balance & Transaction Tracking • Admin Web Portal Development • Security, Testing & Deployment • Documentation & Handover A couple of questions: • Has a card-issuing provider already been selected, or would you like recommendations based on your target market and compliance requirements? • Will companies fund employee cards manually, or should the platform support automated funding workflows from the beginning? Once we understand the issuing model and operational workflow, we can recommend the most suitable architecture, timeline, and implementation approach. Regards
$710 USD in 6 days
6.3
6.3

Hello, I will build your production-ready per-diem card mobile app for iOS and Android with secure email/password auth, role-based access, and real-time balances. I will integrate a PCI-compliant card issuing platform such as Stripe Issuing or Marqeta, implement encrypted storage, and deliver apps ready for TestFlight and Play Console. Deliverables include the iOS and Android apps, a deployed staging backend (Node or Django), a minimal admin web panel, source-controlled code, build scripts, a hand-over video, and technical documentation. Thanks, Sherman.
$500 USD in 7 days
5.8
5.8

With experience in mobile app development and integrating secure payment systems, I understand your need for a production-ready mobile app to implement your per-diem payment-card system patent. My past work on similar projects involved creating secure authentication systems and implementing payment integrations with platforms like Stripe. Question: Have you already outlined specific design preferences or brand guidelines for the UI/UX of the app, or would you like suggestions based on industry best practices? Regards, Yogesh Kumar
$420 USD in 6 days
5.7
5.7

I can see this is not just a standard payment app — the critical part is turning your patented per-diem card concept into a secure fintech workflow where companies can control funds while employees get a simple card experience. I would start by separating the admin and employee flows clearly, then build the backend around authentication, roles, card lifecycle, spending limits, and transaction syncing. For issuing, I’d first validate whether Stripe Issuing or Marqeta fits your exact regions and physical card roadmap before locking the integration. Sensitive card data would stay with the PCI-compliant provider while the app handles secure tokens, permissions, and encrypted records. I’d also make the admin panel lightweight but practical: account review, limit changes, card controls, and audit visibility without overcomplicating the first release. One thing I’d clarify is whether companies need multi-admin access from day one or only a single owner account initially. I’m ready to help turn the patent workflow into a working production app.
$500 USD in 7 days
5.8
5.8

Philadelphia, United States
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