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Backend Developer (.NET + Azure + SQL) – Complex B2B App Type: Freelance / Contract (potential long-term) Location: Remote (must overlap with IST) Stack: .NET 8, C#, Azure, Azure SQL, REST APIs, Git cross platform (android/ios/windows/macos) About the project (high-level) I’m building a B2B operations / scheduling application with Flutter as the frontend (mobile + desktop). The system has: Multiple related “entities” (think projects, tasks, resources, timelines, etc.) A lot of linked tables (like multiple spreadsheets talking to each other) Complex rules: when data changes in one table, related data across other tables must update consistently. I need a backend that can handle complex relationships and cascading updates reliably, and is designed to scale over time. (Full product details will be shared after NDA.) What you’ll work on Data modelling (relational SQL) Design a normalized relational schema for: Projects / main records Related sub-entities (e.g. items, resources, events, schedules, assignments, etc.) Set up proper foreign keys, constraints and indexes. Ensure the model supports: Filtering by multiple dimensions Linked “sheet-like” views (one change affects several views) Backend API in .NET + Azure SQL Build a .NET 8 Web API with: Clean endpoints for CRUD and listing/filtering of entities Business logic for cascading updates (if field X changes, update related records in a safe, transactional way) Role/permission-aware access (different user types see/edit different things) Use a clean structure (controllers → services → repositories, or similar). Azure setup Deploy the backend to Azure (App Service / Functions – we can decide together). Configure Azure SQL Database and connect it securely. Set up: Environment-based config (dev/stage/prod) Key Vault for secrets Basic logging & monitoring (Application Insights or similar) Integration with Flutter frontend Define and stabilise API contracts (request/response DTOs) for the Flutter team. Provide Swagger/OpenAPI and short dev-facing docs. Security & code quality Use Git (GitHub or similar) from day one. Clean, maintainable code (no god classes, no copy–paste chaos). Be willing to sign NDA and IP assignment; all code and architecture belong to the client. Must-have skills Strong C# / .NET (preferably .NET 6/7/8) Solid experience with relational databases (Azure SQL or SQL Server / PostgreSQL) Experience building REST APIs used by mobile/web frontends Practical experience deploying to Azure (at least App Service + SQL + basic monitoring) Comfortable designing schemas where many tables depend on each other and updates must stay consistent Good communication in English and ability to work independently Nice-to-haves Experience with Azure Functions, Key Vault, and Application Insights Experience with real-time updates (SignalR, WebSockets, etc.) Experience in B2B / internal tools with lots of “sheet-like” data and complex filters Exposure to Flutter projects (even just from the API side) Engagement details Initial scope: Design the DB schema Implement the core API for main entities and their dependencies Set up Azure deployment (dev + simple prod) If collaboration works well, there’s ongoing work: More modules More complex rules/permissions Performance tuning & reporting
Projekt-ID: 40047330
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30 Freelancer bieten im Durchschnitt ₹674.771 INR für diesen Auftrag

As an experienced full-stack developer, I believe I am a perfect fit for your complex B2B operations application project. With strong expertise in Microsoft technologies such as .NET and Azure, and well-versed in building relational SQL databases to accommodate intricate data models, I'm confident I can create a backend that matches your needs. Throughout my career, I've handled many cross-platform assignments, including developing apps for Android, iOS, Windows, and macOS. My prior experience with Flutter projects will ensure smooth integration with the frontend. Proficient in Git and well-aware of the significance of maintainable code, using these tools has been my standard practice for efficient collaboration and high-quality deliverables. Moreover, my solid background in deploying applications to Azure (which includes Azure SQL) ensures a seamless transition from development to deployment. In addition to meeting the must-have requirements like role-based access control and performance-sensitive schema design, my skill set even brings value-added capabilities in the form of experience with real-time updates (SignalR, WebSockets) - features that could prove useful and potentially enhance your application's functionality.
₹950.000 INR in 90 Tagen
8,0
8,0

Hi, With over a decade of experience, I bring to the table a comprehensive understanding of .NET, C#, and intricate database management. My proficiency in designing, implementing and deploying complex, data-driven web applications with ASP.NET and C# will prove invaluable to your project. I specialize in creating robust REST APIs targeted at mobile and web applications, ensuring your task management app runs smoothly across all platforms. Having worked extensively with Azure SQL as well as other relational databases such as SQL Server and PostgreSQL, I am well-versed in constructing sophisticated schema models that can efficiently manage cascading updates across linked tables – an imperative requirement for your application. Moreover, my exposure to Flutter projects from the API side adds another layer of compatibility. Concerning your engagement details, I am fully capable of handling the tasks you've outlined. I'll meticulously design the DB schema while taking into account the intricacies of entity relationships and consistency of updates. Implementing a well-structured .NET 8 Web API with cascading update logic while ensuring role/permission-aware access is another area where I excel. Additionally, my expertise in Azure will ensure a seamless deployemnt to Azure App Service or Functions
₹560.000 INR in 7 Tagen
6,7
6,7

Hi, I can support you end-to-end in building a scalable backend for your B2B operations platform. I specialise in .NET 8 Web API, Azure App Services, Azure SQL, and complex relational data models, which aligns directly with your requirements. Why I’m a strong fit - Deep experience designing normalized relational schemas with many interlinked tables, foreign keys, constraints, and cascade-safe rules. - Build clean, modular .NET APIs (controllers → services → repositories, transactional business rules). - Skilled with Azure App Service, Azure SQL, Key Vault, Application Insights, CI/CD, and environment-based configs. - Comfortable enforcing role-based access, multi-entity filters, and consistent updates across dependent tables. - Used to working with mobile frontends (MAUI) clear API contracts, DTOs, and Swagger docs. What I will deliver ✔ Complete relational DB schema ✔ .NET 8 API with CRUD, filtering, cascading updates, and transactional rules ✔ Secure Azure setup ✔ API documentation + Swagger for easy use by your Flutter team ✔ Clean Git history, readable code, and quick iterations Availability Full overlap with IST, remote collaboration, NDA/IP assignment ready. Happy to begin with schema + core modules and continue long-term if we’re a great fit. Let me know if you'd like a quick technical call or want me to review any early model Note: Price, timeline is to be discussed
₹600.000 INR in 40 Tagen
5,8
5,8

Hey, i will start by designing a clean and normalized relational schema in azure sql to handle complex data structures and relationships between multiple entities like projects, tasks, and resources. i’ll ensure proper foreign keys, constraints, and indexes for efficient querying and consistency across linked tables. the backend will be developed using .net 8 and c#, with a focus on clear endpoints for crud operations, proper business logic for cascading updates, and role-based access control for different user permissions. to deploy, i’ll use azure app service for the backend and configure azure sql for secure and scalable database access, along with environment-specific configurations. i’ll set up monitoring and logging using application insights. once the api contracts are stabilized, i’ll collaborate with the flutter team to ensure smooth data exchange between the backend and frontend. 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 Regards, Mughira
₹750.000 INR in 7 Tagen
4,4
4,4

As an experienced backend developer with a strong command of the .NET framework, I have successfully designed and implemented complex, scalable systems capable of handling interrelated data and cascading updates effectively. My proficiency in Azure and Azure SQL, along with my skills in REST API development, will facilitate the smooth transmission and utilization of data between the backend and your Frontend built using Flutter. Understanding the intricate needs of your B2B task management app, I am confident in my ability to design a relational schema that accommodates multiple dimensions and supports "sheet-like" views. The knowledge derived from my years of practical experience in building APIs for data-driven web and mobile applications will be indispensable in constructing clean endpoints for CRUD operations on your various entities, providing multi-tenant access based on roles/permissions while safeguarding the integrity and security of the database. In addition to offering solid technical expertise, I take pride in delivering code that is clean, maintainable, and highly efficient. My familiarity with tools like Git, Azure Functions, Key Vault, Application Insights, etc., aligns well with the nuances of your project.
₹800.000 INR in 90 Tagen
4,3
4,3

Hello, I’ve carefully reviewed your project to build a complex B2B operations/scheduling backend using .NET 8, Azure SQL, and REST APIs to support your Flutter cross-platform frontend. With extensive experience in designing normalized relational databases and scalable backend APIs, I specialize in creating robust schemas and transactional business logic to ensure data consistency across interconnected tables. I am confident in delivering clean, maintainable .NET code with secure Azure deployment including App Service, Key Vault, and monitoring setup. My approach includes close collaboration, quick API stabilization with Swagger, and proper role-based access control as per your requirements. I’m open to NDA and committed to full IP ownership transfer. I propose to start with designing the relational schema and API foundation within 20 days, thereafter expanding to ongoing modules and performance tuning. Could you share more about the volume of data and expected load to guide schema optimizations? Best regards, Roshan
₹832.500 INR in 1 Tag
2,7
2,7

Hello Client, Greeting of the day!!!! I read your job description I have sound of five years plus experience in App development. I have been DEVELOPED 35+ Apps, three taxi apps, Two socials apps and restaurant apps based on GPS location and notification functionality and based on different domain like sports, Health, GYM, personal business and social etc I have testing team for testing apps. I think I am strongest person for doing this job and provide the quality product with testing. I am always available for your support. Thanks Sr. Mobile Developer
₹600.000 INR in 90 Tagen
1,4
1,4

My name is Shiva, and I believe my extensive experience in backend development with databases, particularly SQL Server and PostgreSQL, makes me an excellent fit for this project. As the Technical Lead for a high-profile company, Wheel and Tire Club Inc., I've handled demanding tasks that have required me to design and build complex, scaleable databases precisely like the one you need. I'm highly skilled in .NET 8, C# and have significant practical knowledge in Azure deployments including App Service, SQL, and monitoring. I can assure you not only a clean codebase necessary for maintaining the large project but also efficient data models that ensure data integrity across multiple related entities in your application. Having worked on B2B projects before, I'm already well-acquainted with "sheet-like" data structures and complex filters that your app requires. Finally, my commitment to excellence is steadfast as attested by my resolve never to abandon any task regardless of complications. For your Cross-Platform Task Management application needing dependable backend support, I am confident that I possess the technical skills and dedication that you are looking for. Together we can understand every nook and cranny of the project to ensure its successful implementation.
₹750.000 INR in 14 Tagen
0,0
0,0

Hello, I can take on this backend project fully. I’ve already built B2B systems with multi-entity relationships, complex cascading rules, and “sheet-like” data views, so the structure you’re describing is very familiar. The challenge here isn’t the interface—it’s designing a backend that keeps every linked table consistent when something changes, and I’ve delivered that exact kind of logic before. My approach: • Model your data so projects, tasks, resources, schedules, and all sub-entities stay tightly connected without slowing down filtering or reporting. • Build the backend with clear endpoints, stable contracts, and a clean separation of business rules so every update is safe, traceable, and predictable. • Set up environments, secure configuration, logging, monitoring, and a deployment flow that keeps development and production organized. • Provide a straightforward admin layer for roles, permissions, and data visibility so different user types see exactly what they should. • Work closely with your Flutter team so integrations are smooth, documented, and unblocked from day one. Since I’ve already delivered platforms with similar relational depth and workflows, I can get your core schema, backend logic, and deployment foundation running quickly and reliably. Please let me know your thoughts. Looking forward to connect over chat/call, Regards, Sagar P.
₹500.000 INR in 7 Tagen
0,0
0,0

Hey, Experienced .NET 8 architect with 12+ B2B operations platforms (Azure SQL + Flutter frontends) ready to design your normalized relational schema handling complex cascading updates across projects/tasks/resources/timelines with transactional consistency and role-aware APIs using Azure App Service + EF Core + MediatR. Key Differentiators: --> Unit of Work + domain events ensure zero partial updates --> Compiled queries + indexed views for complex filters (project × status × resource × date) --> Horizontal partitioning ready + Azure SQL Hyperscale path I will focus on your requirements. I worked on similar projects and can share upon request. Let’s discuss timeline and budget based on these details via chat. Regards, Atta
₹650.000 INR in 25 Tagen
0,0
0,0

Hi, I am a software developer with 30+ years of experience and my forte is databases and my passion for coding and for working on new technologies. I have done complex apps in .net/c# and focussed oa lot on their scalability and security.
₹750.000 INR in 30 Tagen
0,0
0,0

⭐️ Dear Respected Client, I wish you a healthy day. ⭐️ Happy to sign NDA and start with schema + core API + Azure setup. ⭐️ I would love to support your Cross-Platform Task Management App project. I bring 8+ years of experience in .NET (Core 6/7/8), C#, Azure App Services, Azure SQL, REST API design, and transactional workflows handling complex relational structures and cascading updates. ⭐️ Quick questions to align ahead: 1. What is the approximate number of core entities/tables at the start? 2. Should we consider SignalR for future real-time task updates? 3. What is your timeline and budget so I can plan accordingly? ⭐️ Let’s connect and move this forward!
₹900.000 INR in 110 Tagen
0,0
0,0

Hi, We at Resonite Technologies have a proven team experienced in .NET, Azure, and complex relational database design, perfectly suited for your cross-platform B2B operations app. We can deliver a robust, scalable backend with: Relational data modeling in Azure SQL for projects, tasks, resources, schedules, and interlinked entities, with proper foreign keys, constraints, and indexes to ensure data integrity Cascading update logic that automatically maintains consistency across dependent tables with transactional safety .NET 8 Web API with clean, role-based endpoints, filtering, sorting, and transactional CRUD operations, along with Swagger/OpenAPI documentation for seamless Flutter integration Azure deployment setup, including App Service, Azure SQL, Key Vault for secrets, and Application Insights for logging and monitoring Environment-based configuration for dev, stage, and prod, ensuring secure, maintainable, and scalable infrastructure Clean, maintainable code following best practices with controllers → services → repositories structure, ready for future modules, complex rules, and performance tuning Our team can start immediately, deliver a secure, production-ready backend, and collaborate closely to ensure smooth integration with your Flutter frontend. Best regards Resonite Technologies
₹1.000.000 INR in 7 Tagen
0,0
0,0

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