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I need an experienced full-stack developer who can jump in immediately and spend the next two days (now through 19 April) pairing live with my small team. We already have a React front-end scaffold and a partially built ASP.NET Core back-end; your job is to connect the dots so everything works seamlessly. We are exposing a RESTful API and must complete three core capabilities before the deadline: user authentication, data retrieval, and data submission. On the front end you will wire these endpoints into React components that include real-time form validation and a handful of interactive UI elements. You should be comfortable shaping clean TypeScript props, handling state with hooks or Redux, and writing concise Axios (or Fetch) calls that respect our existing folder structure. For the back-end work you’ll finish the controller logic, tighten up EF Core queries, and ensure the auth flow (JWT) is solid. Once those pieces are stable we will connect them to the front end and test the full path together. Because timing is critical, I need you available on a shared screen / voice channel while you work so we can review code, push to our Git repository, and resolve blockers instantly. Good Git hygiene, clear commit messages, and the ability to explain what you are doing as you do it are essential. Deliverables (by 19 April): • Completed RESTful endpoints for auth, retrieval, submission • React components fully wired to those endpoints with live form validation • End-to-end test proving a new user can sign up, log in, fetch data, submit data, and see immediate UI feedback • Final push to our repo and a brief hand-off note summarising remaining TODOs (if any) If you thrive in rapid, collaborative sprints and know .NET Core + React cold, let’s get started right away.
Project ID: 40378190
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49 freelancers are bidding on average ₹24,069 INR for this job

Your JWT implementation will fail under concurrent login attempts if you're not handling token refresh and race conditions properly. That's the #1 reason authentication flows break during load testing, and it sounds like you're pushing this live without a safety net. Before we jump on a call, I need clarity on two things: Are you using refresh tokens or relying on sliding expiration? And what's your current EF Core query pattern - are you tracking entities in memory or using AsNoTracking for read operations? These decisions will determine whether your API can handle 50 users or 5,000. Here's how I'll stabilize this sprint: - JWT + REFRESH TOKENS: Implement secure token rotation with HttpOnly cookies to prevent XSS attacks and handle concurrent refresh requests without invalidating active sessions. - EF CORE OPTIMIZATION: Refactor queries to use AsNoTracking for reads, add proper indexing on your MySQL foreign keys, and implement connection pooling to prevent timeout errors under load. - REACT + TYPESCRIPT: Wire Axios interceptors that automatically retry failed requests and refresh expired tokens without breaking the user experience or duplicating API calls. - FORM VALIDATION: Build reusable validation hooks with Yup schemas that run client-side but mirror your C# model attributes so validation logic stays consistent across layers. - GIT WORKFLOW: Structure commits by feature (auth, retrieval, submission) with rollback points so if something breaks on 19 April we can revert without losing two days of work. I've done 8 similar rescue sprints where teams had 48-72 hours to ship. The difference between success and failure is knowing which corners you can cut and which ones will collapse the system. Let's schedule a 20-minute technical call today to walk through your current repo structure and auth flow before I block my calendar for the next two days.
₹22,500 INR in 7 days
7.2
7.2

As an experienced full-stack developer for over a decade, I’ve rigorously honed my skills to not just get the job done, but to get it done right. Having successfully handled multiple projects involving integrating APIs, especially in .NET and React, your project aligns perfectly with my strengths. My sound familiarity with RESTful architecture, understanding of TypeScript props and comfortability with hooks or Redux for state management on React along with detailed knowledge of Axios (or Fetch) for making API calls will surely benefit this assignment. My work history has led me to develop a knack for finding efficient solutions and executing them methodically; ensuring scalability and security remain paramount. Customer satisfaction has always been my priority; therefore I promise unwavering commitment to ensure successful completion of the assigned three core capabilities. Furthermore, my proficiency in E2E testing will be deployed to deliver not just functional requirements but also a foolproof system. Embarking upon this collaboration would offer us an opportunity to witness firsthand how your vision will transform into reality because that's where my strength lies – transforming ideas into efficient execution. So let's join forces and make this API & React integration sprint even more successful. Thank you for your consideration, Vimal Kumar Prajapat
₹27,500 INR in 7 days
5.3
5.3

Hello, Hope you are doing well. I understand your need and with 9+ years of experience, we specialize in delivering scalable, high-quality digital solutions tailored to clearly defined business needs. Since your requirements match our core capabilities, I’m confident we can deliver a solution that is robust, refined, and built for long-term growth. Our approach is straightforward: understand the scope in depth, execute with precision, and deliver measurable results. From a strong front-end experience to a secure, enterprise-grade back-end, quality and reliability remain our priority. I’d be happy to discuss your requirements further and outline the best execution strategy. Best regards, Abid H.
₹12,500 INR in 7 days
5.3
5.3

Hi, As per my understanding: You need a full-stack developer to immediately pair with your team for two days to complete integration between an existing React front end and ASP.NET Core backend. The priority is finishing REST endpoints for authentication, data retrieval, and submission, wiring them cleanly into React components with TypeScript, live validation, and proper state handling. JWT authentication must be solid, EF Core queries optimized, and the entire flow tested end-to-end before final repo push. Implementation approach: I will begin by reviewing the current API contracts and React structure to align data models and TypeScript interfaces. On the backend, I will finalize controller logic, validate JWT issuance and middleware, and optimize EF Core queries for clean responses. On the frontend, I will integrate endpoints using Axios or Fetch, implement real-time form validation, and ensure proper state handling via hooks or Redux. We will test the full authentication and data flow live during pairing sessions, commit incrementally with clear messages, and deliver a final integration note. A few quick questions: 1. Is authentication using Identity or custom JWT logic? 2. Are API response models already standardized? 3. What timezone will pairing sessions follow?
₹12,500 INR in 7 days
5.2
5.2

Hello, I’ve reviewed your project details and understand that you need quick integration of your React front-end with an ASP.NET Core back-end, including auth, data retrieval, and submission. I have 5+ years of experience working on multiple full-stack projects, including React (TypeScript), API integration, and .NET Core with JWT authentication. You can check my work samples here: A few quick advantages working with me: • Available immediately for live pairing • Strong React + .NET Core experience • Clean API integration & state management • Clear Git workflow & quick debugging Advanced Features: -JWT auth flow, -Real-time validation, -Optimized APIs, -End-to-end testing Best Regards Monica Bhatia
₹19,000 INR in 2 days
4.6
4.6

Hi, I’m Karthik with 15+ years of experience in ASP.NET Core, React, TypeScript, REST APIs, JWT authentication, and rapid sprint-based delivery. I can join immediately and work live with your team over screen share/voice to complete the remaining .NET + React integration before 19 April. I have strong experience with: * ASP.NET Core Web API * JWT authentication and authorization * EF Core query optimization * React with TypeScript * Axios/Fetch integration * Hooks, Redux, and form validation * Git workflows and collaborative sprint delivery I can help complete: * Auth endpoints for signup/login * Data retrieval and submission APIs * Controller logic and EF Core fixes * React components wired to APIs * Live validation and UI feedback * End-to-end testing for full user flow * Final repo cleanup and handover notes I’m comfortable pairing live, pushing frequent commits, explaining implementation decisions, and resolving blockers quickly. I have worked on similar fast-paced delivery sprints for SaaS dashboards, CRM systems, admin panels, and internal enterprise tools. Available to start immediately. Warm Regards, Karthik B Resonite Tech
₹55,000 INR in 7 days
5.1
5.1

Hello, I can jump in immediately and work live with your team to complete the integration within the deadline. Approach: * Finish .NET Core APIs (Auth, Data Fetch, Submission) with clean EF Core queries * Implement secure JWT authentication flow * Wire React (TypeScript) components with APIs using Axios/Fetch * Add real-time form validation & proper state handling (hooks/Redux) * Perform end-to-end testing (signup → login → fetch → submit) * Maintain clean Git commits with live collaboration I am comfortable working in fast-paced pairing sessions and resolving blockers in real-time. Expertise: PHP, JavaScript, MERN Stack, C# Programming, MySQL, .NET Core, Full Stack Development Available immediately for live collaboration. Let’s finish this fast. Regards, Nitin Johnson
₹25,000 INR in 7 days
4.0
4.0

Integration sprints on an unknown codebase are usually fine, but two days is tight if there's any ambiguity between what the API actually returns and what React expects. That's usually where the time goes. ASP.NET Core is my day job. I write controllers, wire EF Core to MySQL, and consume APIs from React every week. The stack you're describing is familiar, not something I'd be learning on the clock. MySQL instead of SQL Server is a non-issue with EF Core. What I'd do on day one: pull the repo, map the existing endpoints against what the frontend is calling, identify gaps or mismatches. From there it's usually either wiring missing endpoints, fixing response shapes, or sorting out auth middleware. Day two is integration testing and cleanup. - API audit and gap analysis - Missing or broken endpoints implemented - React-side integration wired and tested - CORS, auth, and serialization issues resolved 30,000 INR, 3 days. I'm adding a day rather than 2 because I'd rather give you a buffer than rush the last 20% and leave bugs behind. One question before I can be more specific: is the API mostly built and this is just about wiring the React side, or are both partially done with specific integration points blocking you? That changes how I'd split the two days.
₹30,000 INR in 3 days
3.9
3.9

Dear Hiring Manager, I have over 12+ years of experience in full-stack development with strong expertise in React, TypeScript, ASP.NET Core, and RESTful API integration. I’ve worked on time-critical projects where rapid delivery, clean architecture, and real-time collaboration were essential. For your project, I can immediately join your team and work live to connect the React front end with your ASP.NET Core back end. I’ll ensure seamless API integration, solid JWT-based authentication, efficient EF Core queries, and responsive UI with real-time validation using hooks or Redux. Clarification points: • Current auth flow status (what’s completed vs pending) • API structure and naming conventions • Preferred state management (Hooks or Redux) • Any existing validation library in use • Deployment/testing environment setup I’m fully available for the next two days and comfortable working on shared screen/voice, maintaining clean Git commits, and resolving blockers in real time. Best Regards, JP
₹20,000 INR in 7 days
3.6
3.6

As an experienced full-stack developer with a diverse skill set, I am confident in my ability to integrate your React scaffold with an existing ASP.NET Core back-end. I have a strong command over JavaScript and the React framework and have deployed them effectively across numerous projects. My attention to clean code and keen eye for detail make me particularly adept at shaping TypeScript props, managing state with hooks or Redux, and constructing concise Axios calls – all of which aligns intimately with your requirements. On the back-end, my extensive experience with MySQL and EF Core queries will ensure that not only will your RESTful API be thoroughly completed, but also highly optimized. My proficiency in database processing and system visualization can be leveraged to enhance the overall functionality of your project as well. Moreover, my knowledge of authentication flow using JWT will ensure its solidity within your application. Lastly, I have a knack for efficient problem-solving aided by excellent communication skills. These will be instrumental when working harmoniously in a tightly synchronized collaboration so as to meet the looming deadline without compromising on quality. I look forward to spearheading this sprint and offering you a reliable end-to-end solution that is thoroughly tested for our final push. It's time to turn this project into a success story - let's get started right away!
₹12,500 INR in 1 day
4.2
4.2

Hey, I liked your project, .NET API & React Integration Sprint and believe I can help you with the project. With my background in JavaScript, C# Programming, MySQL, I'm confident I can meet your requirements. Would be glad to go over specifics if you're interested.
₹12,500 INR in 7 days
4.5
4.5

With 9+ years in web and mobile development, I have perfected the .NET Core and React combo that your project demands. I've executed numerous RESTful integrations, data retrievals and submissions, user authentications, and state management with Redux. My ability to clip through the backend (tightening up EF Core queries) and frontend (writing concise Axios calls) is second nature to me. My company brings an experienced team capable of working alongside yours. We are skilled at maintaining clear Git hygiene for efficient collaboration, which is crucial for your sprint approach. My 3 months of complementary post-delivery support aligns with your project culture of resolving blockers instantly and ensuring flawless operation. You can count on us to deliver quality work that meets your specifications by 19th April. Let's remember that turning each idea into gritty reality is a mutual goal here. For us, this means working conscientiously to make sure your endpoints for auth, retrieval, and submission are grounded, all React components are wired with real-time form validation, and an end-to-end test validates essential capabilities like sign up and log in. With our combined effort, we can create an API/React duo that not only works seamlessly but sends immediate UI feedback, thereby ensuring a satisfactory user experience all around.
₹25,000 INR in 7 days
3.8
3.8

Hello, I have 6+ years of experience in C# and ASP.NET Core, with strong expertise in building and fixing scalable Web APIs and backend systems. I can quickly understand your requirement and deliver an efficient solution. I can help you with: ✔ Fixing issues in your existing ASP.NET Core project ✔ Debugging and resolving API errors ✔ Implementing missing features (CRUD, validations, etc.) ✔ Improving code quality and performance I focus on writing clean, maintainable, and production-ready code. I am confident in identifying the root cause of issues and delivering reliable fixes with proper testing. I have successfully completed 20+ similar projects, including systems like property management, transportation, and API-based platforms. I am available to start immediately and can complete the task within a short time. Let’s connect and get this done efficiently.
₹30,000 INR in 7 days
2.6
2.6

Hi, This is a strong fit for me because the scope is very clear and time-sensitive: **finish the API, wire the React side properly, and stay live with the team until the full flow works**. I’m comfortable working exactly in that mode — shared screen, rapid commits, direct problem-solving, and no wasted time. I can help complete: * **ASP.NET Core** REST endpoints for auth, retrieval, and submission * **JWT** auth flow and EF Core query cleanup * **React + TypeScript** integration with hooks and clean API calls * real-time form validation and immediate UI feedback * end-to-end testing from signup to submit What matters most here is moving fast **without creating messy code** you regret after the sprint. That’s exactly how I’d approach it: fix the backend flow first, connect the frontend cleanly, then test the full path live with your team and push stable commits to the repo. I’m ready to jump in immediately for a collaborative sprint setup. If you send the repo structure and current blocker list, I can tell you the fastest execution path right away. Best regards. Ankit.
₹12,500 INR in 2 days
2.2
2.2

Jumping into your project with a React scaffold and a partly built ASP.NET Core backend, I understand the urgency to connect your RESTful API endpoints for authentication, data retrieval, and submission within two days. A key challenge will be seamlessly syncing backend JWT auth flows with React’s real-time form validation while respecting your existing TypeScript structure. My approach would focus on completing robust controller logic and efficient EF Core queries, then wiring Axios calls into clean React components using hooks or Redux. I also prioritize clear commits and continuous pairing to avoid blockers. Having worked extensively on similar full-stack projects, I’m comfortable collaborating live to deliver a smooth end-to-end solution. Open to discussing what would work best for you.
₹23,000 INR in 7 days
2.2
2.2

As a seasoned full-stack developer with over 8 years of professional experience, you can count on me to effectively complete your .NET API & React Integration Sprint within the next two days. My extensive expertise in API Development, ASP.NET, Database Administration, and RESTful services aligns perfectly with your project requirements. Having developed numerous robust APIs and worked with multiple databases including MySQL, I am well-equipped to handle the essential tasks of user authentication, data retrieval, and data submission in a timely manner while ensuring coding quality. Moreover, my familiarity with both React and real-time form validation will be instrumental in effectively wiring the RESTful endpoints on your front-end and incorporating interactive UI elements that your project demands. Furthermore, my solid experience with Git and knack for good Git hygiene will ensure seamless collaboration throughout the project as we continually review code and push it to your Git repository resolving blockers instantly. Given this unique blend of technical proficiency and dedication to client satisfaction, I would not only complete all your core capabilities well before your deadline but also provide a comprehensive hand-off note summarizing any remaining TODOs if any. I thrive in collaborative sprints as you've mentioned and given my skillset in .NET Core and React combined with my commitment to high-quality delivery, I believe our collaboration would be truly worthwhile.
₹25,000 INR in 7 days
2.4
2.4

Hi there, I have strong hands-on experience with React (TypeScript, hooks, Axios) and ASP.NET Core (REST APIs, EF Core, JWT authentication), so I can quickly align with your existing structure and start delivering without ramp-up time. I will finalize controller logic, optimize EF Core queries, and ensure a secure and stable JWT authentication flow. On the frontend, I will wire your React components to the APIs, implement real-time form validation, and handle clean state management with well-structured props and API calls. By the deadline, I will ensure - • Auth, data retrieval, and submission endpoints are complete and stable • React components are fully integrated with proper validation and UI feedback • End-to-end flow works smoothly from signup to data submission • Clean final push with a short hand-off note Let’s connect to discuss and start work! Thanks Saurabh
₹25,000 INR in 7 days
3.5
3.5

Hi Client, Sean, Full-Stack Developer, 8 years experience, .NET Core, React, TypeScript. I built end-to-end ASP.NET Core + React integrations that shipped secure JWT auth, efficient EF Core queries, and responsive UI wiring for multiple SaaS clients, reducing integration time by weeks. My skills map directly to your sprint: I will complete controller logic, tighten EF Core queries, finalize JWT flows, and wire Axios-based calls into React components with typed props and hook-driven state; I can do this project perfectly and pair live with your team to unblock issues as they arise. I will implement real-time form validation, concise API clients that respect your folder structure, and clear commit hygiene while pairing over screen and voice. I typically deliver this scope in 2 days, including unit/integration tests and deployment-ready pushes. I enforce tests, logging/monitoring, OWASP basics, clean code and documentation to ensure maintainability and security. Which auth edge cases or third-party integrations (e.g., external identity providers, MFA) should I prioritize during the pairing session so I can prepare test accounts and fixtures? Best regards, Sean
₹25,000 INR in 2 days
1.4
1.4

Hello, I understand you need a full-stack developer to jump in immediately and pair live with your team to complete React + ASP.NET Core integration within 2 days. I’m comfortable working in real-time collaborative sprints and can quickly stabilize both frontend and backend. What I’ll Handle: • Complete REST endpoints (auth, data retrieval, submission) • Finalize JWT authentication flow • Optimize EF Core queries • Connect APIs to React (Axios/Fetch) • Implement form validation + UI feedback • Ensure clean TypeScript structure + state handling Working Style: • Live pairing (screen share + voice) • Fast debugging and iteration • Clean Git commits + clear communication Deliverables (by deadline): • Fully working auth + API flow • React fully wired to backend • End-to-end tested flow (signup → login → fetch → submit) • Final repo push + handoff notes I’m ready to start immediately and work live with your team to get this done. Feel free to message me so we can jump in right away. Warm regards, SamreenCoders
₹15,000 INR in 7 days
0.0
0.0

Hello, I understand the task and will ensure your expectations are me. I am a skilled freelancer with 4 years of experience in JavaScript, MySQL, API Development. Check my profile for portfolio and reviews. Looking forward to your reply. Warm regards, Syeda Tahreem
₹25,000 INR in 7 days
0.0
0.0

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