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Build a business automation system (ERP) with desktop application, mobile app, workflow, contracts management, and OTP authentication using .NET and Flutter
Project ID: 40373368
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179 freelancers are bidding on average $33 USD/hour for this job

A Warm Hello! We are readily available to start working on this project!! We will provide you comprehensive business automation (ERP) system. Building a unified platform that combines desktop operations, mobile accessibility, workflow automation, and secure authentication is a challenge we’re well-equipped to handle. Our Understanding of Your Requirements You’re looking to develop a scalable ERP solution that includes: - Desktop Application for core business operations - Mobile App (Flutter) for on-the-go access - Workflow Automation to streamline processes - Contracts Management System for document lifecycle handling - Secure OTP Authentication for user access and verification We’re confident in delivering a reliable, scalable ERP system tailored to your business needs and would be happy to start within your desired timeframe. Looking forward to your response. Best regards, Ana
$25 USD in 40 days
10.0
10.0

With over a decade of experience in full-stack architecture and high-scale systems, I understand your goal of developing a dynamic ERP system using .NET and Flutter. Drawing from my background in building high-complexity solutions, such as serving over 1 million users, I am well-equipped to tackle the challenges of your project. For strategic insight, implementing a microservices architecture can enhance scalability and maintainability for your ERP system. My proven track record includes successful deployment and scaling of projects, ensuring smooth operations even at high user volumes. I encourage you to reach out so we can discuss in further detail how I can contribute to the success of your ERP development project. Let's collaborate to create an efficient and secure solution that meets your business automation needs effectively.
$40 USD in 15 days
8.4
8.4

What you’re building is more than a standard ERP, it’s a multi-platform system where desktop, mobile, and workflow automation all need to stay in sync. I’d approach this by structuring a solid backend layer in .NET to handle business logic, workflows, contracts, and authentication, with clear APIs powering both the desktop application and Flutter mobile app. This keeps everything consistent and easier to scale as features grow. From experience with similar systems, the tricky part is usually workflow design and data consistency across platforms, so I’d make sure that’s handled cleanly from the start rather than patched later. I’ve worked on SaaS-style platforms with dashboards, role-based access, and structured data flows, so building something stable and production-ready aligns well here. Happy to discuss how you want to structure modules and roll this out in phases. Best, Jenifer
$38 USD in 40 days
9.0
9.0

Hi, This is the kind of system we’re already building with INTEGRA 360 (2.0), so we can reuse and adapt proven modules instead of starting from zero. Since your core requirement is a desktop ERP, we would build the main application in .NET (WPF/WinForms) with ASP.NET Core APIs as the backend, and add a Flutter mobile app for on-the-go access and approvals. That gives you a strong desktop foundation plus a modern mobile layer connected to the same system. Workflow automation, contract management, and OTP verification would all be built as part of one connected platform, so your team gets a smooth and practical experience instead of separate tools patched together. The focus will be on making the system clean, efficient, and easy to use while keeping it ready for future expansion. We’d also be happy to show you a quick demo of relevant INTEGRA 360 modules. Best, Talha
$25 USD in 40 days
8.6
8.6

Hello, I hope you’re doing well. My name is Vishal Nasit, and I represent OM Infowave Software Pvt. Ltd. We are a 10+ years experienced IT firm specializing in website and mobile application development. We have successfully delivered many high-quality apps and websites for clients across different industries. ? Our Expertise Design & Frontend • Photoshop, Figma • HTML, CSS, JavaScript, jQuery • Bootstrap Website Development • PHP • Laravel • CodeIgniter • React.js • MySQL Database Mobile Application Development • Android • iOS • Flutter (Cross-platform) ✅ Why Choose Us • 10+ years of industry experience • Clean, scalable, and secure code • Modern UI/UX design • On-time delivery & regular updates • Long-term support after project delivery ? Our Approach 1. Understand your exact requirements 2. UI/UX design approval 3. Development with regular milestones 4. Testing & quality assurance 5. Final delivery and deployment 6. Ongoing support if required ? Cost & Timeline • Cost: Depends on project scope and features • Timeline: Will be shared after requirement discussion • Availability: Immediate start I would be happy to discuss your project in detail and provide a precise quote and timeline based on your needs. Looking forward to working with you. Best regards, Vishal Nasit OM Infowave Software Pvt. Ltd.
$27 USD in 40 days
8.3
8.3

I READ YOUR REQUIREMENTS CAREFULLY AND UNDERSTOOD VERY WELL ABOUT THE PROJECT SCOPE AND START WORKING ACCORDINGLY IN STAGES. >>>> Multi languages (English and Arabic)Left-To-Right (LTR) and Right-To-Left (RTL) <<<< I have more than 10+ years of experience in enterprise application development, including ERP systems using .NET for backend/desktop applications and Flutter for cross-platform mobile apps. I will design a scalable ERP architecture with modular components covering business workflows, contracts management, and secure OTP-based authentication. The backend will be built using .NET (Web API + secure services), while the desktop application can be developed using .NET (WPF/WinForms) and the mobile app using Flutter for seamless cross-platform performance. The system will include role-based access, workflow automation, contract lifecycle management, notifications, and secure data handling. APIs will ensure smooth communication between desktop, mobile, and backend services. I will follow a structured development approach: system architecture → module planning → UI/UX → development → testing → deployment, ensuring clean, maintainable, and scalable code. I WILL PROVIDE 2 YEAR FREE ONGING SUPPORT AND COMPLETE SOURC CODE, WE WILL WORK WITH AGILE METHODOLOGY AND WILL DELIVER FULLY FUNCTIONAL ERP SYSTEM WITH DOCUMENTATION AND FUTURE SCALABILITY. I am available to start immediately and open for long-term collaboration. I eagerly await your positive response. Thanks.
$25 USD in 40 days
8.3
8.3

Having worked as a Senior Software Architect and Full-Stack Developer for over 15 years, I have built and deployed numerous business applications similar to what you described in the ERP project. With my deep experience in .NET and Flutter technologies, I am confident in my ability to develop a scalable, secure, and efficient application for your business needs. One of my core strengths lies in providing an enterprise-grade software architecture that ensures your application performs optimally while being easy to maintain. This comes from having worked with notable firms like CSC, Fiserv, RBS, and CMG where I gained extensive knowledge of industry best practices and standards. My dedication to delivering clean, reliable, and production-ready code makes me an ideal choice for your project. Moreover, being a Microsoft Certified Professional (MCP) with certifications such as MCAD | MCSD | MCTS | MCPD underscores my proficiency in these technologies. I'm a dependable professional who always emphasizes clear communication along with on-time delivery. For all these reasons, I believe I could deliver extraordinary]+YPE results for your ERP development project. Let's discuss how we can turn your concept into a productive system!
$25 USD in 40 days
8.4
8.4

Being an experienced full-stack developer, I strongly believe my skill set perfectly suits your ERP project using .NET and Flutter. My proficiency in ASP.NET and C# programming would be instrumental in building the desktop application and workflow management systems for your business. Meanwhile, my mastery in mobile app development using Flutter empowers me to develop a seamless and robust mobile application that would perfectly align with the overall ERP system. Throughout my career, I have created versatile applications using various APIs. This expertise would work wonders for your project, particularly when integrating the myriad components of an ERP like contracts management and OTP authentication. Moreover, I have a proven track record of client satisfaction through clean coding practices ensuring high-quality deliverables within specified timelines. By trusting me with this project, you're opting for a cost-effective yet top-notch solution that would automate your business and enhance your productivity significantly. When it comes to ERP development, let's pair my knowledge and skills with your vision to build something truly impactful!
$38 USD in 40 days
8.2
8.2

Dear , 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 .NET, Mobile App Development, C# Programming, ERP, Software Development, ASP.NET, API, Flutter, Database Management, Desktop App 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.
$30 USD in 5 days
7.5
7.5

Hi, I’ve reviewed your requirements for a full ERP system with desktop app, mobile app, workflows, contract management, and OTP authentication—and I can confidently develop this end-to-end solution. I’ve already built a similar enterprise platform using Node.js for backend and Flutter (for cross-platform mobile), including role-based workflows, document/contract lifecycle management, and secure OTP-based authentication. So I’m familiar with both the technical stack and business logic involved. My approach: Requirement finalization & system architecture Backend development ( Node.js APIs, auth, workflow engine) Desktop app (WPF/WinForms based on need) Flutter mobile app (Android/iOS) Contract & document module with audit tracking OTP integration (SMS/email providers) Testing, deployment & support Do you have a preferred OTP provider (e.g., Twilio, MSG91), or should I suggest one? Will the workflow engine need to be fully customizable by admin users? Happy to discuss and start right away. Best regards. Rahul
$25 USD in 40 days
7.4
7.4

Hello, I understand you need a complete business automation system including a desktop app and mobile app using .NET and Flutter. The system should handle workflow and contracts efficiently and include OTP authentication for security. I plan to build the desktop app with C# and .NET, and the mobile app using Flutter to ensure smooth cross-platform experience. Database management and API integration will be set up for seamless data flow between modules. The workflow and contracts management will be designed for easy control and monitoring of business processes. OTP authentication will be added for secure user verification. To move forward clearly, I need to know the expected number of users and the specific workflows you want to automate. Also, what type of contracts and their key features? What level of OTP integration do you need? Do you already have a preferred database or API specs? Can you provide details on the number of users and specific workflows you want to automate in this ERP system? Thanks,
$25 USD in 30 days
7.1
7.1

Good to see this project, I will deliver the ERP system — desktop app in .NET, mobile app in Flutter, workflow engine, contracts module, and OTP authentication. For the workflow component, I will use a state-machine pattern so each business process has clearly defined stages and transitions — this makes it simple to add or modify workflows later without rewriting logic. Questions: 1) Which database do you prefer — SQL Server, PostgreSQL, or another? 2) Will OTP be sent via SMS, email, or both? Ready to start whenever you are. Kamran
$34 USD in 40 days
7.5
7.5

Hi, I'm excited to propose for the development of a comprehensive business automation system (ERP) that includes a desktop application, mobile app, workflow management, contract management, and OTP authentication. Leveraging my decade of experience in software development, I'll utilize .NET for the desktop application and Flutter for the mobile app to ensure a seamless user experience across platforms. Key features will include: - Real-time data synchronization - Advanced workflow automation - Secure contract management with version control - Robust OTP-based authentication I've successfully delivered complex projects in the past, as evidenced by my portfolio available at https://www.freelancer.com/u/reedsystems. This system is designed to streamline operations and enhance efficiency for your business. Looking forward to discussing this further! Best regards, Reed
$35 USD in 5 days
6.5
6.5

Your ERP's biggest risk isn't the tech stack - it's data consistency across desktop and mobile when users modify the same contract offline. Without conflict resolution logic and proper sync queues, you'll face data corruption within the first month of deployment. Quick question - what's your expected concurrent user count, and are you planning SQL Server or PostgreSQL? Also, does your workflow engine need approval chains with role-based permissions, or just basic task routing? Here's the architectural approach: - .NET CORE + ENTITY FRAMEWORK: Build a centralized API layer with CQRS pattern to separate read/write operations, ensuring desktop and mobile apps never directly touch the database. - FLUTTER + OFFLINE-FIRST SYNC: Implement local SQLite storage with background sync queues that handle conflict resolution using last-write-wins or custom merge strategies. - OTP AUTHENTICATION: Integrate Twilio or AWS SNS for SMS delivery with Redis-based rate limiting to prevent brute force attacks and reduce SMS costs by 40%. - WORKFLOW ENGINE: Design a state machine using Hangfire for background job processing, supporting multi-level approvals with audit trails and email notifications. - CONTRACT MANAGEMENT: Store documents in Azure Blob Storage with versioning enabled, using SignalR for real-time collaboration when multiple users view the same contract. I've built 3 ERP systems for manufacturing and logistics companies that handle 500+ daily transactions without downtime. Let's schedule a 20-minute call to discuss your workflow complexity and database schema before I map out the full architecture.
$34 USD in 30 days
6.7
6.7

I am a seasoned software developer with extensive experience in building robust ERP systems using .NET and Flutter. My expertise lies in developing comprehensive business automation solutions that incorporate both desktop and mobile applications. This makes me well-equipped to take on the development of your dynamic ERP system as outlined in your project listing. I have successfully completed several projects involving .NET and Flutter, which included implementations of complex workflows, contracts management, and multi-factor authentication like OTP. My approach involves leveraging the strengths of .NET for creating efficient, scalable back-end solutions while using Flutter for developing cross-platform, responsive mobile applications. I am interested in discussing your specific requirements to tailor the solution precisely to your business needs. Could you share more details about your current workflow challenges or any existing systems that the ERP should integrate with? I am ready to provide further information or arrange a call to explore this project further.
$25 USD in 40 days
6.7
6.7

Hi — the real job here is to build one business system that behaves consistently across desktop and Flutter mobile, not a set of separate screens around the same database. The failure point in ERP work is usually workflow drift: a contract gets approved on desktop, the mobile app still shows the old state, and users start bypassing the system with calls and messages. I’d center this on a .NET API with strict state transitions for contracts, approvals, and OTP-protected actions, then keep both clients consuming the same rules. The hardest decision early is how dynamic you want workflows to be — configurable in admin versus coded per process — because that choice affects the schema, permissions, and long-term maintenance path. I’d start by locking the core entities and approval lifecycle before expanding modules.
$50 USD in 40 days
6.7
6.7

Hi I can build a business automation ERP ecosystem with a .NET backend, desktop application, Flutter mobile app, workflow automation, contract management, and OTP-based authentication in one connected platform. My experience with .NET application development, REST APIs, SQL database design, Flutter mobile apps, role-based systems, workflow logic, and secure authentication fits this kind of project well. A major technical challenge in ERP systems is keeping desktop, mobile, workflows, contracts, and authentication fully synchronized without creating fragmented data or unstable business processes. I would solve that by designing a centralized backend with clean APIs, structured modules for contracts and workflows, and a shared data model that supports both desktop and mobile users consistently. I’m also comfortable implementing OTP authentication, approval flows, document handling, notifications, and admin controls in a secure and scalable way. The result would be a practical ERP system that supports daily operations smoothly while remaining maintainable for future expansion. I can help ensure the platform is built with clean architecture so each module works together reliably instead of feeling like separate disconnected tools. Thanks, Hercules
$50 USD in 40 days
6.5
6.5

Hello There!!! ★★★★ ( Full ERP system with .NET backend and Flutter mobile integration ) ★★★★ Project understanding: You want to build a complete ERP system with desktop app, mobile app, workflow automation, contract management, and OTP-based authentication using .NET and Flutter. ⚜ .NET backend & ASP.NET APIs ⚜ Desktop application (C#) ⚜ Flutter mobile app integration ⚜ Workflow & business automation ⚜ Contract management module ⚜ OTP authentication system ⚜ Database design & management I have experince working on full-stack systems and business applications. I enjoy building structured platforms like ERP where multiple modules connect smoothly. Approach: I will design modular architecture, build APIs in .NET, connect Flutter app, and ensure secure auth with OTP. Focus will be scalability and clean workflow. Let’s connect and discuss modules and timeline. Warm Regards, Farhin B.
$25 USD in 40 days
6.5
6.5

Hello 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 , java spring boot and php CodeIgniter mvc. Please consider me and initiate a chat for further detailed discussion. Regards, Anju
$25 USD in 40 days
6.5
6.5

Hello there, We've reviewed your project details and are excited about the opportunity to develop a dynamic ERP system using .NET and Flutter. We fully understand the need for a cohesive business automation system encompassing desktop and mobile applications, workflows, contracts management, and OTP authentication. We've previously delivered a similar ERP solution integrating mobile and desktop platforms, ensuring seamless workflow and authentication processes. Our experience in AI-first product development and automation aligns perfectly with your project's requirements, promising a robust, scalable system. With 8+ years in software development and a proven track record as a top 1% freelancer, our expertise spans .NET, C# programming, and building full-stack applications. Our portfolio showcases successful deployments of intelligent systems and scalable applications, solidifying our capability to enhance your ERP project with cutting-edge technology and seamless integration. We'd love to discuss your project further. Please message us with more details, and we'll deliver a comprehensive, tailored proposal within 24 hours. Looking forward to partnering with you on this exciting journey. Kind regards, Puru Gupta
$60 USD in 40 days
6.4
6.4

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