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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: 40375574
131 proposals
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Active 28 days ago
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131 freelancers are bidding on average $528 USD for this job

Greetings from Logictrix! My name is Jas, and I am looking forward to discuss about your ERP system 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
$500 USD in 12 days
9.6
9.6

"I READ YOUR REQUIREMENTS CAREFULLY AND UNDERSTOOD THE NEED TO BUILD A COMPLETE ERP SYSTEM WITH DESKTOP APPLICATION, MOBILE APP, WORKFLOW MANAGEMENT, CONTRACT HANDLING, AND SECURE OTP AUTHENTICATION. I HAVE 10+ YEARS OF EXPERIENCE IN .NET DEVELOPMENT AND MOBILE APP DEVELOPMENT USING FLUTTER, WITH STRONG EXPERTISE IN BUILDING BUSINESS AUTOMATION SYSTEMS AND ERP SOLUTIONS. I CAN DESIGN A SCALABLE ARCHITECTURE THAT HANDLES USER ROLES, WORKFLOWS, CONTRACT MANAGEMENT, AND REAL-TIME DATA SYNC BETWEEN DESKTOP AND MOBILE APPLICATIONS. I WILL IMPLEMENT SECURE AUTHENTICATION (INCLUDING OTP), CLEAN DATABASE STRUCTURE, AND A MODULAR SYSTEM THAT CAN BE EASILY EXTENDED IN FUTURE. THE UI WILL BE USER-FRIENDLY AND OPTIMIZED FOR DAILY BUSINESS OPERATIONS. WE WILL FOLLOW AN AGILE DEVELOPMENT APPROACH WITH CLEAR PHASES — PLANNING, DESIGN, DEVELOPMENT, TESTING, AND DEPLOYMENT. I WILL PROVIDE 2 YEARS OF FREE ONGOING SUPPORT ALONG WITH COMPLETE SOURCE CODE. WE WILL WORK WITH AGILE METHODOLOGY AND I WILL ASSIST FROM ZERO TO FINAL DEPLOYMENT. I EAGERLY AWAIT YOUR POSITIVE RESPONSE. THANKS."
$494 USD in 9 days
8.4
8.4

Hi there, I’ve reviewed your Flutter app requirements and would love to help. With 5+ years of experience in cross-platform development, I specialise in clean UI, smooth performance, and robust API integration. I’ll begin with clear planning, share regular progress updates, and ensure the app is fully tested before launch. Let’s connect to discuss your vision — I’m ready to get started! Best, Bhargav Flutter Developer | Android & iOS Expert
$500 USD in 7 days
6.9
6.9

Hi, We’re a full-stack development team specializing in building scalable business systems, and your ERP requirement fits exactly within our scope. We’ll develop a complete automation system with a robust backend using .NET and cross-platform mobile support via Flutter, ensuring performance, security, and long-term scalability. What we’ll deliver: • Desktop application (secure, high-performance .NET architecture) • Mobile app (Flutter – Android & iOS ready) • Workflow automation system (custom logic for your business processes) • Contracts management module (creation, tracking, approvals) • OTP authentication (secure login & verification system) Our approach: • Clean system architecture for easy scaling and future features • Seamless sync between desktop and mobile • Strong focus on usability and real-world business workflows • Secure data handling and authentication As a full-stack team, we handle everything end-to-end — from system design to deployment — ensuring all components work together reliably. We’ll also provide clear documentation and a handover so your team can manage the system confidently. Ready to start immediately and build this into a powerful, production-ready ERP. Regards INTERCONNECT TEAM
$500 USD in 7 days
6.8
6.8

Hi there, I have read your project requirement. You need a complete business automation system (ERP) with a desktop application, mobile app, workflow automation, contract management, and OTP-based authentication using .NET and Flutter. We can build a scalable ERP solution with a .NET backend (Web API + secure authentication), a desktop app (WPF/WinUI), and a Flutter mobile app. The system will include workflow automation, contract/document management, role-based access, OTP authentication, and a centralized database. The architecture will be modular, secure, and ready for future expansion with clean, maintainable code. Questions: ========= What core modules do you want in Phase 1 (HR, CRM, Finance, Inventory)? Do you prefer cloud deployment (Azure/AWS) or on-premise? Should OTP be via SMS, email, or both? Any existing system/data that needs migration? Best Regards, Srashtasoft Team
$500 USD in 7 days
7.1
7.1

Hi — the real job here is not just building an ERP, but making sure desktop and mobile users are working on the same business state at all times. A common failure in systems like this is when a contract moves through approval on desktop, but the mobile app reflects outdated status or allows actions that should no longer be valid. I’d structure this with a .NET backend as the single source of truth, with strict workflow states for contracts, approvals, and OTP-protected actions, and both Flutter and desktop clients consuming the same rules. The hardest decision early is whether workflows are configurable or fixed in code, because that choice impacts database design, permissions, and long-term flexibility. I’d lock the core entities and lifecycle first, then expand modules cleanly.
$500 USD in 7 days
7.1
7.1

Your ERP architecture will fail under concurrent user load if you don't implement proper transaction isolation and API request queuing from day one. Most .NET + Flutter builds I've audited hit deadlocks when 50+ users access contract workflows simultaneously because developers skip distributed locking patterns. Before architecting this, I need clarity on two things - what's your expected concurrent user count during peak hours, and are you planning SQL Server or PostgreSQL for the backend? Also, does your contracts module require e-signature integration with DocuSign/Adobe Sign, or are you building that in-house? Here's the architectural approach: - .NET CORE WEB API: Build a RESTful backend with JWT authentication, role-based access control, and Redis caching to handle 500+ requests per second without database bottlenecks. - FLUTTER MOBILE + DESKTOP: Share 80% of the codebase between iOS, Android, and Windows apps using BLoC pattern for state management and offline-first architecture with SQLite sync. - OTP AUTHENTICATION: Implement Twilio SMS verification with rate limiting and Redis-based token storage to prevent brute force attacks and ensure sub-3-second delivery times. - WORKFLOW ENGINE: Design a state machine pattern with SQL Server triggers and SignalR for real-time status updates across all connected clients without polling overhead. - DATABASE OPTIMIZATION: Structure your schema with proper indexing on contract search fields and implement Entity Framework query optimization to keep response times under 200ms. I've built 4 ERP systems that scaled from 20 to 300+ users without performance degradation. Let's schedule a 20-minute technical call to discuss your workflow complexity and data migration strategy before we commit to a timeline.
$450 USD in 10 days
6.7
6.7

Hi I can help you design and build a full business automation (ERP) system using a .NET backend and Flutter for both desktop and mobile clients, with a clean architecture that supports long-term scaling across multiple modules. I specialize in building modular ERP systems where authentication, workflows, contracts, and user roles are separated into independent services to avoid tight coupling and future technical debt. A common issue in ERP builds is that authentication, workflow logic, and document management are often mixed together, which makes the system difficult to extend as new business modules are added. I solve this by structuring the backend in .NET as a layered architecture (API, application services, domain, and infrastructure) with clear boundaries between business logic and data access. OTP authentication will be implemented using secure token-based flows with SMS/email verification, role-based access control, and session management across desktop and mobile Flutter clients. The Flutter applications will share a unified UI component system while supporting responsive layouts for desktop, tablet, and mobile, ensuring consistent user experience across all platforms. Core modules such as workflow automation, contracts management, and business processes will be built as independent services so they can evolve without affecting the core system stability. Thanks, Hercules
$500 USD in 7 days
6.5
6.5

Hello There!!! ★★★★ (Scalable ERP system with .NET backend, Flutter app & workflow automation) ★★★★ I’ve reviewed your requirement for a dynamic ERP system with desktop app, Flutter mobile app, workflow handling, contract management and OTP authentication. You need a robust, scalable system for business automation. ⚜ .NET based backend & desktop app ⚜ Flutter mobile application ⚜ Workflow & process automation ⚜ Contracts management system ⚜ OTP authentication integration ⚜ Secure API development ⚜ Database design & management I have strong experince in .NET, Flutter and enterprise systems, and have worked on automation platforms, so I understand complexity and structure needed. I’ll use ASP.NET Core with clean architecture and Flutter for cross-platform app, ensuring modular and scalable code. Let’s connect and discuss your ERP vision further, happy to help build it. Warm Regards, Farhin B.
$256 USD in 10 days
6.6
6.6

Hi there, Asad - I’ve read your Dynamic ERP project with .NET and Flutter and I’m confident I can deliver a robust, scalable business automation system that runs on desktop and mobile, with workflow, contracts management, and OTP authentication. With extensive hands-on work in .NET (ASP.NET Core, C#) and Flutter for cross‑platform UIs, I’ve built ERP-like solutions and enterprise apps that integrate with REST APIs, secure auth flows, and complex data models using SQL databases. I’ll design a modular architecture: a desktop app (Electron/.NET), a Flutter mobile app, a clean API surface, and a workflow engine for contracts and approvals. Security and user experience are central, so OTP-based authentication and role-based access controls will be baked in from the start. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. I propose a phased plan with clear milestones, alignment on technology choices (ASP.NET Core API, Flutter frontends, and a scalable DB), and a focus on maintainability and quick win features. I’ll coordinate with you to set up environments, define data migrations, and implement a robust testing strategy. What are the top 3 ERP modules you must have in the first release (e.g., Contracts, Procurement, Human Resources) and which platforms must be prioritized for MVP? Best regards, Asad
$250 USD in 10 days
6.0
6.0

Hello, I’ve gone through your project details, and this is something I can definitely help you with. I have 10+ years of experience in mobile and web app development, working extensively with ASP.NET and Flutter, making me well-equipped to build a robust ERP system. My focus is on clean architecture and scalable code to ensure seamless functionality across desktop and mobile applications. I will first review your requirements in detail and recommend the best technical approach to meet your needs for workflow, contracts management, and OTP authentication, while keeping you updated at every stage. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob I’m interested in your project and would love to understand more details to ensure the best approach. Could you clarify: 1. Do you have a specific database preference for ERP? Let’s discuss over chat! Regards, Arpit
$250 USD in 20 days
7.4
7.4

Hi I can design and build a complete business automation ERP system featuring a .NET‑based backend and desktop application along with a Flutter mobile app for on‑the‑go access. The solution will include workflow automation, contracts management, OTP‑secured authentication, and a modular architecture for future scalability. Using ASP.NET Core API and Entity Framework, I’ll implement a secure, role‑based system connecting the desktop and mobile clients to a centralized database. The Flutter app will mirror key ERP functions—approvals, contract views, notifications—while maintaining responsive design and offline capability. OTP verification will be integrated via SMS/email gateways for strong authentication. Deliverables include full source code, database schema, API documentation, and deployment guides. With experience in ERP development, .NET frameworks, and Flutter integration, I can deliver a stable, extensible system tailored to your business workflows. Best, Justin
$500 USD in 7 days
6.0
6.0

Hello, I have reviewed the details of your project. i will develop your business automation system using dot net for the backend services and desktop application, and flutter for the mobile app to ensure both platforms stay consistent and connected through a shared api layer. the backend will handle core erp modules including workflow management, contracts handling, user roles, and otp based authentication using secure token generation and verification flows. the desktop application in dot net will provide full operational control for internal users, while the flutter mobile app will allow access to key functions like approvals, task tracking, and contract updates on the go. data will be structured using sql server with clear relational design for workflows, contracts, and user activity logs, and all communication between apps and backend will use secure restful endpoints. i will also set up notification handling for otp and workflow alerts, along with proper logging, validation, and role based access control so each user type only sees relevant data. 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 in 7 days
5.4
5.4

Hi, Sahanaj here. I’ve built ERP/automation systems using .NET backends + Flutter apps with workflows and secure auth. Your budget is too low for full ERP scope. A realistic MVP would be $6K–$12K over 10–14 weeks (modular: workflow, contracts, auth, mobile + desktop). I can propose a phased rollout to fit budget while keeping architecture scalable. One question: which core modules are priority for Phase 1 6contracts, workflow, billing, user management)?
$6,000 USD in 30 days
5.5
5.5

✋ Hi There!!! ✋ The Goal of the project:- Develop a complete ERP system with desktop and mobile apps, integrated workflows, contract management, and secure authentication. I carefully read your requirements and understand you need a full business automation system using .NET and Flutter with smooth integration across desktop and mobile platforms. I am a strong fit because I have built scalable ERP and enterprise systems with clean architecture and reliable performance. • Develop desktop app using .NET and C# with structured modules • Build Flutter mobile app connected via secure APIs with OTP authentication • Implement workflow automation, contracts management, and database design I will also handle UI design, database management, API integration, testing, and provide full source code at completion. I have 9+ years experience as a full stack developer and have delivered similar ERP and business systems successfully. Looking forward to chat with you for make a deal Best Regards Elisha Mariam!
$256 USD in 10 days
5.5
5.5

Hello! As per your project post, you’re looking to build a dynamic ERP system that includes a desktop application, mobile app, workflow automation, contract management, and OTP-based authentication using .NET and Flutter. The goal is to create a centralized business automation platform that streamlines operations, manages contracts and workflows efficiently, and provides secure access across devices while being scalable for future modules and integrations. My focus will be on delivering a complete ERP solution, featuring: a robust backend built with .NET for scalable business logic and API management; a cross-platform mobile app using Flutter for seamless user experience; and a desktop application for advanced operations and administration. The system will include workflow automation for task/process management, a contracts module for document lifecycle handling, OTP-based authentication for secure login. I specialize in building enterprise-grade systems and ERP platforms with strong experience in .NET ecosystems, mobile app development, and scalable architecture design. My approach focuses on clean architecture, performance, and long-term maintainability while aligning closely with real business workflows. Let’s connect to review your business processes, module priorities, and user roles so we can define a clear Phase 1 roadmap and execution plan. Best regards, Nikita Gupta
$300 USD in 10 days
5.4
5.4

Hello there, we are a team of full stack developers. We are experts in .NET, Mobile App Development, Software Development, Desktop App . Please, send me a message to discuss the work. Thanks Ashish Kumar
$500 USD in 7 days
5.1
5.1

You need a unified ERP with desktop, Flutter mobile, workflow-driven contracts and OTP auth — that combination of real-time workflows plus mobile access is exactly where complexity hides. Most projects stall when business rules live in multiple places; keeping the workflow/state engine centrally in the .NET API and pushing only necessary data to clients avoids mismatch and audit headaches. I built a logistics ERP using .NET Core APIs, a WPF desktop client, and a Flutter mobile app — it handled contract lifecycle, signature/versioning, SMS OTP, and workflow state transitions. I’d deliver a .NET Core backend (role-based APIs, workflow engine, SQL Server), a WPF desktop client for power users, and Flutter mobile with offline sync and OTP via a provider like Twilio. Iterative sprints: core CRUD → workflows → contracts → OTP/security → QA. Quick question: how many concurrent users and do you need offline mobile access or real-time sync only?
$500 USD in 7 days
4.8
4.8

With over 14 years of industry expertise, my skillset as a full-stack developer with specialization in .NET and Flutter makes me an excellent fit to build your dynamic ERP system. I possess a deep understanding of the technologies you require such as C#, WPF, XAML, Blazor, and many more. Whether it's developing desktop applications or mobile apps with extensive database management, my knowledge will ensure we not only meet but exceed your expectations. One of my core strengths lies in integrating advanced features into applications - a crucial need in a complex and comprehensive project such as an ERP system. My experience extends beyond conventional development as I'm also experienced in US Healthcare Echo System including bill and invoice processing and integrating biometric devices. This solidifies my capability to handle all the aspects involved in your project seamlessly. Besides technical prowess, I pride myself on delivering clean, maintainable code while utilizing CI/CD pipelines for smooth deployment. My meetings with deadlines are non-negotiable, and alongside this; I am committed to open lines of communication with thorough progress reports throughout our collaboration. Together we can build not just a business automation system but a game-changing solution that'll positively impact your organization's growth. Let's forge ahead on this transformative journey!
$500 USD in 7 days
5.9
5.9

Hello [ClientFirstName], I hope you are doing well. I am an independent developer with a solid background in .NET, C#, API design, and Flutter. I’ve built scalable ERP-like systems that span desktop and mobile, with workflows, contracts management, and secure OTP authentication. I focus on clean architecture, robust data modeling, and a smooth cross‑platform user experience. In similar projects I delivered modular ERP components, workflow orchestration, contracts management, and secure authentication, using ASP.NET Core on the backend and Flutter on mobile, backed by a reliable API layer and well‑designed databases. I guarantee a maintainable, performance‑oriented solution tailored to your business needs. I can handle this end‑to‑end based on my experience, delivering a cohesive ERP with desktop and mobile clients and a solid deployment plan. Please feel free to contact me so we can discuss more details. I am looking forward to the chance of working together. Best regards, Billy Bryan
$450 USD in 5 days
4.5
4.5

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