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Looking for Full-Stack Developer for Hybrid Voucher & Digital Wallet Platform Project Description: We are building a scalable, secure micro-change system that converts cash into digital vouchers and a spendable balance. The platform will use WhatsApp and USSD as primary user interfaces, integrated with third-party services for redemption (e.g., electricity, airtime, groceries). Key Requirements: Develop a multi-interface system: a WhatsApp Bot, a USSD interface, a Merchant Web Dashboard, and an Admin Dashboard. Build core backend services: a Voucher Engine for generating/tracking single-use codes, a Spend Balance Aggregator, and a Notification Service. Integrate multiple third-party Partner APIs for real-time redemption (airtime, utilities, etc.). Implement a secure, relational database (PostgreSQL/MySQL) with data encryption and audit logging. Architect the system using a microservices approach (Docker/Kubernetes) with an API Gateway, caching (Redis), and async queues (RabbitMQ/Kafka). Incorporate robust fraud detection, rate limiting, and secure authentication (JWT/OAuth 2.0). Required Skills: Backend Development (Node.js/Python/Java) Microservices & API Gateway Design Database Design & Management (PostgreSQL/MySQL) WhatsApp Business API & USSD Integration Third-Party API Integration DevOps & Cloud Deployment (AWS/GCP/Azure, Docker, Kubernetes) Security & Fraud Detection Implementation Please provide examples of previous similar projects, especially those involving financial transactions, voucher systems, or chatbot/USSD integrations.
ID do Projeto: 40005493
70 propostas
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Ativo há 2 meses
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70 freelancers estão ofertando em média $672 USD for esse trabalho

Hello, I came across your project and found it truly interesting. With over eight years of hands-on experience in this field, I have successfully delivered high-quality solutions to clients worldwide. My dedication to excellence is reflected in the 180+ positive reviews from satisfied clients. I’d love to bring this expertise to your project and ensure outstanding results. However, I do have a few important points I’d like to clarify to align perfectly with your vision. Let’s connect via chat, where I can also share relevant examples of my past work. I'm looking forward to hearing back from you! Best Regards, Divu.
$750 USD em 8 dias
8,1
8,1

Hello, I am a friendly and reliable full-stack developer with solid experience in Shopify, WordPress, PHP, Laravel, React, Node.js, Odoo, and mobile app development (Flutter/React Native). I love building clean, fast, and user-friendly web and mobile solutions. Whether you need custom features, API integrations, Odoo workflows, mobile apps, or UI/UX improvements, I’m here to help. I communicate clearly, deliver on time, and always aim to build long-term working relationships. Happy to support your project anytime! With Regards! Nikhil
$750 USD em 7 dias
8,0
8,0

YES, it's aligned with my expertise Develop a multi-interface system: a WhatsApp Bot, a USSD interface, a Merchant Web Dashboard, and an Admin Dashboard. ------------------I am highly proficient to work on this project . I am a Passionate Python/Azure/Full stack developer having rich experience with all the latest technologies with so many successful Tasks. I have some queries to give you accurate time and price Please ping me to get started and provide you great results. Thanks
$800 USD em 7 dias
8,1
8,1

HI! I am an expert web programmer. I have a lot of work experience in Laravel, Codeigniter, PHP, Wordpress, JavaScript, HTML, Vuejs, Reactjs, React Native, and MySQL. I can start right away. I want to discuss this project in detail. Please contact me to discuss more regarding this project. For more details Chat with me
$500 USD em 7 dias
7,5
7,5

Hello!! I have reviewed your project requirements for a hybrid Voucher & Digital Wallet Platform and can deliver a secure, scalable, and fully integrated solution. With 10+ years of experience in full-stack development, I can build a microservices-based architecture with WhatsApp and USSD interfaces, Merchant and Admin dashboards, and a robust backend handling voucher generation, balance aggregation, notifications, and third-party API redemptions. I will implement a secure relational database (PostgreSQL/MySQL), caching (Redis), async queues (RabbitMQ/Kafka), fraud detection, and secure authentication (JWT/OAuth2), all deployable on cloud environments using Docker/Kubernetes. Voucher & Wallet Platform – Key Features Multi-Interface Access: WhatsApp Bot, USSD interface, Merchant Dashboard, Admin Dashboard. Voucher & Wallet Engine: Generate/track single-use vouchers, manage spendable balances. Third-Party Integrations: Real-time redemption for airtime, utilities, groceries, etc. Secure Backend: Relational database (PostgreSQL/MySQL) with encryption, audit logging, and fraud detection. Microservices Architecture: API Gateway, async queues (RabbitMQ/Kafka), caching (Redis), Docker/Kubernetes deployment. Security & Authentication: JWT/OAuth 2.0, rate limiting, and fraud prevention mechanisms. Scalable & Robust: Designed for high-volume, secure financial transactions. Thanks.
$370 USD em 15 dias
7,3
7,3

OVER TEN YEARS EXPERIENCE IN FULL-STACK SYSTEMS, FINTECH MICROSERVICES & SECURE PAYMENT FLOWS I’m excited about this project because it blends financial logic, multi-channel interfaces, and strict security—exactly the kind of architecture I’ve built for voucher platforms, mobile money services, and WhatsApp/USSD integrations. I can deliver the full ecosystem: WhatsApp bot + USSD flow, a merchant dashboard, and an admin dashboard, all powered by a microservices backend (Node.js or Python) with an API Gateway, Redis caching, and async queues for high-volume events. I’ve previously built voucher engines, single-use code systems, balance ledgers, and fraud-prevention layers with encryption, audit logging, rate limiting, and JWT/OAuth authentication. I’m also familiar with integrating third-party services for airtime, utilities, and digital goods in real time. For deployment, I’ll set up Docker/Kubernetes, CI/CD, and secure cloud infrastructure on AWS or GCP. I can share examples of fintech and telecom-grade systems I’ve built—including USSD wallets, WhatsApp transaction bots, and redemption engines—once we begin the discussion. Thanks...
$300 USD em 15 dias
6,5
6,5

Hi there, I’m excited about the opportunity to develop your Hybrid Voucher and Digital Wallet Platform. With extensive experience in building scalable backend systems using Node.js and Python, I am well-equipped to create a secure micro-change system. My background in developing similar financial transaction platforms, including secure voucher systems and chatbot integrations, gives me the confidence to tackle your project efficiently. I specialize in creating multi-interface systems and can develop the WhatsApp Bot and USSD interface you need. I will implement a relational database using PostgreSQL with proper encryption and audit logging to ensure data security. My approach will encompass a microservices architecture utilizing Docker and Kubernetes, along with integrating third-party APIs for seamless redemption experiences. Fraud detection and secure authentication are also top priorities in my development process. I propose to get started quickly and am confident I can deliver within 45 days. Let’s discuss further to tailor the solution to your needs!
$299 USD em 7 dias
6,5
6,5

Hello, Thank you so much for posting this opportunity. It sounds like a great fit, and I’d love to be part of it! I’ve worked on similar projects before, and I’m confident I can bring real value to your project. I’m passionate about what I do and always aim to deliver work that’s not only high-quality but also makes things easier and smoother for my clients. Feel free to take a quick look at my profile to see some of the work I’ve done in the past. If it feels like a good match, I’d be happy to chat further about your project and how I can help bring it to life. I’m available to get started right away and will give this project my full attention from day one. Let’s connect and see how we can make this a success together! Looking forward to hearing from you soon. With Regards! Abhishek Saini
$750 USD em 7 dias
6,6
6,6

Hi! My name is Marjan and I'm here to offer you my services as a skilled applicant with over a decade of experience working on Freelancer.com. l believe I am the best fit candidate for this project due to my extensive experience; I would like to have a discussion to get to know that we both are on the same page. Once the scope will be locked, I will start working on it right away.
$250 USD em 7 dias
6,3
6,3

With over a decade of experience as an interdisciplinary technologist, I believe I embody the expertise and vision that your voucher and wallet platform requires. At Solutionzhere, we have successfully implemented and deployed complex systems similar to your project - defined by the need to be scalable, secure, and API-driven on hybrid interfaces like WhatsApp and USSD. Let's talk more over chat and work together. Thanks and regards.
$900 USD em 14 dias
6,0
6,0

Hello There!!! ⚜⭐⭐⭐⭐⚜(( Building a secure hybrid voucher and wallet system with multi-channel access ))⚜⭐⭐⭐⭐⚜ Your project stands out because it blends financial transactions, real time redemptions, and multi interface user access into one unified platform. You are looking for a full stack partner who can architect a scalable voucher engine, wallet balance flow, dashboards, and API driven services. I have worked on modular backend systems with microservices, secure authentication, and integrations across third party APIs, which aligns well with your voucher logic, spend aggregation, and WhatsApp or USSD driven workflows. My approach is to design a clear service architecture, implement a strong database model with encryption, and set up an API gateway supported by caching and async queues for reliability. Three important features • Voucher generation and tracking engine with audit logs • WhatsApp, USSD, merchant and admin interfaces connected to one backend • Secure microservices with rate limiting and fraud detection Would be glad to walk you through a structured plan and examples of similar work. Warm Regards, Farhin B.
$256 USD em 15 dias
6,3
6,3

** NO UPFRONT PAYMENT ** I can start immediately My name is Amarjeet Singh I have read your job I am very familiar & specialized in Python Azure MySQL Node.js Docker Backend Development Kubernetes I am very excited to see your job posting as I am confident that I am a perfect fit for what you are looking for I have checked out all your requirements regarding application development and we can help you. AM highly interested in your project, as I have worked on many similar projects. Apart from this i have make good use of APIs and web services. I have integrated API and web services. If you award me the project I'd be very happy to discuss this further and get started for you as soon as possible. You can see an example of one of those projects in my portfolio here: https://www.freelancer.in/u/fullstack0407
$500 USD em 18 dias
5,9
5,9

I’ve built voucher and wallet systems before and can deliver a clean microservices setup with WhatsApp, USSD, merchant and admin interfaces all tied to a secure backend. I’ll implement the voucher engine, spend-balance logic, partner API integrations and real-time redemption flows with proper rate limiting and fraud protection. I’ll use an encrypted relational database, JWT/OAuth authentication and containerised deployment with Docker/Kubernetes. The result: a fast, secure, production-ready platform with clear dashboards and a stable foundation you can scale.
$587,94 USD em 12 dias
5,7
5,7

Hello, I have reviewed the details of your project. i will set up the project repository and configuring cloud deployment on aws to ensure reliable hosting and scalability. the backend will be developed using node.js with microservices deployed in docker containers orchestrated by kubernetes, and an api gateway will manage traffic while redis caching and rabbitmq queues will handle performance and async tasks. a secure relational database using postgresql will store user data, vouchers, and transactions with encryption and audit logging. the whatsapp bot and ussd interface will be integrated to allow users to create and redeem vouchers, while merchant and admin dashboards will manage balances, transactions and notifications. third party apis for airtime, utilities, and groceries will be connected for real time redemption and jwt authentication with fraud detection and rate limiting will protect the system. Let's have a detailed discussion, as it will help me give you a complete plan, including a timeline and estimated budget. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
$500 USD em 7 dias
5,4
5,4

Hello, Thank you for detailing your requirements for the hybrid Voucher & Digital Wallet platform. I specialize in scalable, secure systems leveraging microservices, with proven delivery on chatbot, USSD integrations, and financial transaction platforms. Your vision for multi-interface access and real-time voucher redemption aligns well with my expertise in WhatsApp Business API, API gateways, and cloud deployments (Azure, Docker, Kubernetes). For your full platform—with robust fraud detection and secure authentication—I estimate an initial MVP within 4–5 weeks, contingent on API access and final specs. Could you please clarify your preferred cloud provider and status on WhatsApp/USSD approvals? Are there transaction limits or multicurrency requirements for the wallet? Happy to share case studies of similar solutions. Looking forward to partnering for a secure, user-friendly rollout. Regards Sahanaj
$250 USD em 1 dia
4,9
4,9

Hi there, I'd love the opportunity to connect and discuss your project in detail—feel free to reach out via chat anytime. I'm a full-stack developer with strong experience in building both web and desktop applications. I’m confident I can manage and deliver your project efficiently and on time. In addition to my development background, I’m a Web3 enthusiast actively learning smart contract development through Updraft/Cyfrin, and I have hands-on experience in DevOps, giving me a broader perspective on project deployment and scalability. My technical expertise includes: MERN / MEAN Stack: Extensive hands-on and team leadership experience, ensuring smooth front-end to back-end integration. .NET Core & Angular: Implemented various data visualizations using D3.js, integrated complex APIs, and developed dynamic, responsive applications. Azure Logic Apps & SharePoint: Built multiple workflow automation solutions; also familiar with PowerApps development. Salesforce Development: Developed Apex triggers to interact with MSSQL via custom .NET APIs. Created Visualforce pages to fetch and display external API data. Performed CRUD operations on both standard/custom Salesforce objects. Conducted R&D on Salesforce Flows for automation (with some custom object limitations). I bring a full-lifecycle development mindset and enjoy solving real-world business challenges through code. Looking forward to hearing from you! Thanks!
$500 USD em 5 dias
4,3
4,3

Greetings, I understand your requirement for building a secure hybrid voucher and digital wallet platform and my hypothesis is that using a microservices architecture with Dockers will ensure smooth performance across WhatsApp, USSD, merchant dashboards, and the admin panel. I’ll implement a robust voucher engine, secure spend-balance system, encrypted relational DB, real-time partner API integrations, and strong authentication with fraud-prevention layers, all tied together through an API gateway and async queues for high reliability. Let’s connect and we will jump on further discussion, btw this is not an auto bid like others. Best regards, Shawana
$500 USD em 15 dias
4,0
4,0

Hi! Thanks for invite my name is usman and I'm here to offer you my services as a skilled applicant with over a decade of experience working on Freelancer.com. I believe I am the best fit candidate for this project due to my extensive experience. I would like to have a discussion to get to know that we both are on the same page. Once the scope will be locked, I will start working on it right away.
$700 USD em 7 dias
3,5
3,5

DELIVERING EXCELLENCE — PAY AFTER RESULTS! Hello my valuable client :) I’m Samreen, a Full-Stack Developer with 10+ years of of solid experience in this field. I’ve completely understood your project [Full-Stack Developer for Voucher & Wallet Platform] and I’m confident I can deliver it perfectly within your timeframe. Give me one chance to prove my skills (PHP, WordPress, WooCommerce, Laravel, CodeIgniter, CakePHP, Shopify, Adobe Photoshop, Illustrator, CorelDRAW,Bootstrap, HTML, CSS, Angular, JavaScript, jQuery, MySQL, Wix, Vue, Node, Next, React, Stripe, PayPal, custom APIs, AI Chatbots, and CRMs). I assure you of clean work, professional communication, and on-time delivery. You don’t need to pay me until you’re fully satisfied with the results, so please have faith in me :) Let’s discuss your project briefly so I can get started right away and bring your vision to life. Thanks & Regards, SAmreen AA Full Stack Developer | UX & UI Designer
$250 USD em 1 dia
3,6
3,6

As an experienced full-stack developer with a strong affinity for innovative web application solutions, I believe I am the ideal candidate for your project. Not only have I successfully delivered similar projects in the past, but I have also worked on complex systems involving financial transactions and voucher management. My expertise in integrating third-party services, utilizing various APIs to facilitate real-time redemption, will prove invaluable to building a robust micro-change system for you. One of my key skills is my ability to architect scalable, secure backend services - something that I believe is crucial for your project's success. Additionally, my database management skills with popular options like PostgreSQL and MySQL, will ensure data encryption and audit logging are implemented effectively. A microservices approach using Docker/Kubernetes is familiar territory for me, and will be instrumental in creating a manageable system for your voucher & wallet platform. Given the monetary aspect of this project and its need for security and fraud detection, I understand the importance of time sensitive identification of unusual behavior. My previous work summarizes precisely those strengths in addition to user-friendly front-end development. I am ready and eager to put my years of experience into making your vision a reality! Let's connect soon to hash out how we can make a real difference together.
$500 USD em 7 dias
3,3
3,3

Johannesburg, South Africa
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