Need a .NET Full Stack Developer for your product / project or an eCommerce platform even custom web-based application? I can build scalable, production ready software using ASP.NET Core, C#, React, JavaScript, TypeScript, SQL Server, Azure, REST APIs, and AI/LLM integrations and many more with modern frameworks. I help startups, founders, agencies, and growing businesses to build and improve modern software products, if you are launching a new MVP and Prototypes, extending an existing application, modernizing legacy systems, integrating third-party services, or improving performance, reliability, and maintainability I can be the best fit for this. My focus is on SaaS applications, eCommerce software, admin dashboards, internal business systems, cloud-based platforms, and API-driven products and any custom application. What I can help you with: Full-stack web development with .NET / ASP.NET Core, C#, React, JavaScript, and TypeScript SaaS development including multi-tenant architecture, authentication, user roles, subscription flows, admin panels, dashboards, and workflow automation eCommerce development including product catalogs, cart and checkout flows, order management, payment gateway integration, and back-office systems Backend development with Web API / REST API, business logic, third-party integrations, and secure, scalable services Cloud deployment on Microsoft Azure, including app hosting, storage, serverless functions, background jobs, and deployment workflows Database design and optimization using SQL Server / SQL, with a focus on performance, clean schema design, and reliable data handling AI/LLM features such as chat assistants, smart search, workflow automation, content generation tools, and Claude/OpenAI-powered integrations I write clean, maintainable code and build software with long-term usability in mind. I care about clear communication, thoughtful architecture, performance, security, and delivering solutions that support real business goals, not just completed tasks. Whether you need a developer to build a SaaS platform from scratch, improve a React frontend, extend an ASP.NET Core backend, optimize SQL queries, deploy to Azure, integrate APIs, or add practical AI functionality, I can help turn requirements into reliable software.

With 𝟭𝟰+ 𝘆𝗲𝗮𝗿𝘀 architecting in the .NET ecosystem, I design C# .NET and cloud-native architectures that are built for the 𝟮𝟬𝟮𝟲 reality: scalable across AWS and Azure, secure by default, and wired for AI from day one. Whether you're a founder launching your first SaaS or a CTO staring down a legacy monolith that nobody wants to touch, I bring the technical leadership to turn that vision into something fast and maintainable. What I Actually Bring to the Table: - Legacy Modernization: I've untangled enough "spaghetti" .NET Framework (3.5/4.8) codebases to know that rewriting isn't always the answer.. but when it is, I migrate into clean, modular .NET 8/9 microservices that your team can actually work with. - AI & Automation: From Azure OpenAI to AWS Bedrock, I implement agentic workflows and RAG pipelines that automate the boring stuff and let your team focus on what matters. - Performance Engineering: SQL Server query plans, indexing strategies, cloud cost optimization, I've cut latency and slashed AWS/Azure bills by 30%+ more times than I can count. - Security-First Architecture: Zero-Trust, OAuth2, SOC2-compliant designs for fintech, healthcare, and anyone who can't afford a breach headline. The 𝟮𝟬𝟮𝟲 Stack I Work In: Backend: C#, ASP.NET Core 8/9, MVC, Web API, gRPC, SignalR, Blazor (Server/WASM) Frontend: Angular 19, React (Next.js), TypeScript, Tailwind CSS Cloud & DevOps: Azure (Functions, Logic Apps, Service Bus, OpenAI) · AWS (Lambda, S3, Bedrock) · Docker · Terraform · GitHub Actions · CI/CD · Microservices Architecture · Domain-Driven Design · CQRS · OAuth2 · JWT Data: SQL Server (optimization specialist), PostgreSQL, MongoDB, Vector Databases for AI/RAG pipelines Why 𝟭𝗖𝟰+ Years Matters: I've led teams, rescued failing projects, and shipped for startups and Fortune 500s alike. I speak ROI and Go-To-Market as fluently as I speak CI/CD. You'll not be hiring someone who just writes code, you'll get a technical partner who makes sure your technology accelerates your business instead of holding it back. Available for architectural audits, project rescues, or long-term development. Click 'Message' let's talk about where your project needs to go.

I am a Senior .NET Architect and full-stack developer specializing in business applications, Blazor, DevExpress XAF, API integrations, and AI-powered workflow automation. I help businesses build reliable software that saves time, automates manual work, improves visibility, and connects their tools into one smooth process. My core expertise includes: • ASP.NET Core Web APIs • Blazor Server and Blazor Web Apps • DevExpress XAF, XPO, WinForms, and reporting • SQL Server, MySQL, SQLite, and Airtable • n8n workflow automation • AI integrations with Claude/OpenAI • CRM and lead management systems • API integrations and backend architecture • Windows Server / IIS deployment • Business dashboards and internal tools Recent AI-focused projects include: • LeadFlowAI: an AI-powered lead automation platform that captures leads from a public website, sends them through n8n, stores records in Airtable, qualifies leads with Claude AI, generates follow-up messages, and provides a secure Blazor dashboard for monitoring leads, workflows, AI logs, messages, and failures. • SignalDeskAI: an AI-assisted business dashboard concept focused on monitoring operational signals, surfacing useful insights, and supporting better decision-making through organized data views and intelligent summaries. These projects reflect the kind of systems I enjoy building most: practical business software with clean .NET architecture, useful automation, AI-assisted workflows, and dashboards that help teams understand what is happening in their operations. I am especially useful for clients who need: • A custom business application • A Blazor or DevExpress XAF system • An AI-powered automation workflow • n8n, Airtable, or third-party API integration • A secure ASP.NET Core API backend • A dashboard for operations, reporting, monitoring, or decision support • Modernization of an existing .NET application I focus on clear communication, reliable delivery, and building systems that are practical for real business use.

AI features that work in production. Faster MVPs. Clean handoff you can maintain. I'm Rinki Singh, a senior full stack engineer with 16 years shipping web apps and B2B SaaS. I help founders and product teams deliver AI‑powered products on a clear plan you can track, with code you own. RAG over private data without surprises. I build retrieval over PDFs. Over Notion or Confluence. Over Slack exports and CRM logs. LangChain and OpenAI where it fits, with vector stores like Pinecone. Weaviate or Redis if that suits the workload. The focus is grounded answers, prompt evaluation you can review, and latency that feels instant. Product features I ship: in‑app chat for customers or agents. Document automation that extracts, validates, then routes. Task copilots wired to your systems through secure APIs. I handle auth and rate limits. Prompt and version control. Offline fallbacks so features survive traffic spikes, not just demos. Full stack buildouts on AWS. React with TypeScript on the frontend. Python with FastAPI for services. REST by default, GraphQL only if it pays off. PostgreSQL for transactional data. Redis for caching and queues. Containers with Docker and Kubernetes. CI/CD in place. Tracing, canary or blue green deploys, instant rollback. Clean Git history and a visible Jira board. Recent outcomes: cut document‑to‑insight time from 45 minutes to 12 seconds for a logistics firm. Scaled a SaaS dashboard from 500 to 50k DAU with zero downtime through a Postgres redesign plus Redis caching. Built a legal‑tech copilot that removed 94% of manual entries in 4 weeks. What I can help with - RAG over your docs and apps, with eval and monitoring - In‑app chat, document processing flows, task copilots tied to APIs - New MVPs or feature rebuilds with React and FastAPI - Backend APIs, PostgreSQL design, Redis caching and queues How I work - Short discovery and scope, then a fit check - Within one week, a working prototype or a detailed API spec - Milestones with weekly demos and a Jira board. Written updates every week - Code reviews, tests, logging and tracing. Clear handover docs at the end I work during US mornings and afternoons, Eastern or Pacific. Also European afternoons. Agreed on‑call for urgent needs. Fast start available within 3 to 5 business days.)

I am a seasoned Senior Backend Engineer with 10+ years of experience delivering high-performance web applications, APIs, and enterprise integrations. My core expertise lies in .NET/C#, SQL Server/PostgreSQL, and Angular, with a strong commitment to test-driven development (TDD) — I don’t take on projects without ensuring proper unit test coverage. ✅ Performance Optimization – Reduced API response times from 6s to 2s through query tuning, indexing, and Redis caching. ✅ Enterprise Integrations – Built seamless connections between logistics systems, Salesforce, and NetSuite, processing 50,000+ transactions monthly. ✅ Automation & DevOps – Designed bots with Automation Anywhere and UiPath, cutting invoice processing from 3 days to 4 hours. Experienced in deploying Azure Functions, AWS Lambdas, and GCP services with robust monitoring and VPC management. ✅ Cloud & Microservices – Developed 15+ REST APIs handling 100,000+ daily requests, deployed with 99.95% uptime. ✅ Frontend Contributions – Skilled in Angular, Razor, Tailwind, and Bootstrap for building responsive, user-friendly interfaces. ✅ AI Tools & Models – Hands-on with Copilot Studio, Claude, LLMs, and RAG pipelines for enhancing workflows, knowledge retrieval, and intelligent automation. My business domain expertise spans health informatics, ERP (Accounting & SCM), and logistics, but I’m always eager to explore new industries and technologies. What clients appreciate about me: Strong focus on quality and reliability — I raised automated test coverage from 45% to 85% across 12 microservices. Ability to reduce costs and save time by automating workflows and optimizing systems. Clear, structured communication and a collaborative approach that ensures client satisfaction. If you’re looking for a results-driven engineer who can optimize performance, integrate complex systems, and deliver scalable solutions, let’s connect.

Next-Gen Software Development Company delivers innovative solutions for SMBs and Enterprises with a proven track record in Product Development, Technology Consulting, and IT Outsourcing. Our Experience Design, Complex Engineering, and Agile Delivery give the best software product for better business outcomes. SERVICE OFFERINGS: - Product Development - Custom Web Development - Enterprise Application - Mobile App Development - Blockchain & Metaverse - BI & Analytics - Generative AI & ML Services - UI/UX Design - Digital Marketing - On-demand Developers & Team TEACHNOLOGY PARTNERSHIP: Alliances with Microsoft, Salesforce, Odoo, SAP, Zoho, AWS, Google, and Hedera have enabled us to co-create high-speed innovation and bring sustainable value to enterprises. TEAM: With 500+ DevOps enabled software professionals and full-stack developers working full-time, they have an average experience of 3 to 20 years. With 15+ years of experience, we have delivered 2500+ projects for more than 1000+ clients located in more than 15 countries. OBJECTIVE: Deliver scalable digital products and software solutions to unlock the power of client-centric intelligent technology that reduces time to market and reimagines cost-takeout initiatives. Create business excellence by staying committed to the core values of generating enterprise value and imbibing the spirit of innovation, forward-thinking, dependability, and integrity with the accountability to drive digital transformation forward. INDUSTRIES: Healthcare & Life science, Travel & Hospitality, Retail & eCommerce, Education & eLearning, Finance & Banking, Manufacturing and Industrial, Logistics & Transportation, Technology, Automotive, Gambling, Aviation, Media & Entertainment, Public Sector, Real Estate, Energy, Agriculture, Consulting, Utilities TECHNOLOGY EXPERIENCE: Open Source: PHP, Python/Django, MEAN / MERN, CGI Perl Microsoft: .NET Core, ASP.NET, SharePoint, Power BI, Azure, C#, VB.NET, Power Apps Mobile: Flutter, React Native, iOS, Android, Swift, Unity, Ionic, Java, Objective-C, C++, jQueryMobile Architecture Patterns: Microservices, Server less, MVC, N-tier, Monolithic ERP & CRM: Salesforce, ODOO, Dynamics365 Business Central / NAV, SAP, Zoho, D365 CRM UI/UX: Photoshop, Adobe XD, Figma, CorelDraw, Fireworks, Dreamweaver, AngularJS, ReactJS, VueJS, Typescript, HTML 5, AJAX, JavaScript, jQuery, Knockout.js, Backbone.js, Frameworks: Laravel, CodeIgniter, Django, Yii, CakePHP, Zend Framework, Symfony, MVC CMS & eCommerce: WordPress, Magento, Shopify, Prestashop, Moodle, Umbraco, BigCommerce, , Zen Cart, NopCommerce, WooCommerce, DotNetNuke Database: MySQL, MariaDB, MSSQL, PostgreSQL, MongoDB, NoSQL, MS Access, Oracle

I build fast, scalable Web & Mobile Apps and MVPs that actually launch. With 15+ years of experience, I help startups turn ideas into production-ready SaaS products clean code, solid architecture, and quick delivery. 💡 What I Do Best Build MVPs that go from idea → live in weeks Develop scalable SaaS platforms (multi-tenant, secure, performant) Turn messy/AI-generated code into clean, production-ready systems Integrate APIs (payments, messaging, auth, third-party tools) Design intuitive, conversion-focused UI/UX ⚙️ Tech Stack I Work With Frontend: Next.js, React, Angular, Tailwind Backend: Node.js, Python, .NET, Serverless Architecture Mobile: Cross-platform apps using React Native/Flutter Database: Supabase, PostgreSQL, MongoDB, Firebase, Integrations: Stripe, Twilio/Sinch, REST APIs, Graph APIs, Google Maps APIs Deployment: Vercel, Railway, AWS, modern CI/CD workflows AI Tools: Claude Code, Lovable, Cursor, Codex, Replit 🚀 Real Results I’ve Delivered Launched MVP platforms in under 3–4 weeks Built SaaS systems with real-time features and scalable architecture Fixed and optimized poorly structured codebases (including AI-generated projects) Delivered end-to-end solutions: design → development → deployment If you’re serious about building something solid, send me a message and let’s get it moving.

More than 20 years in .NET as a full stack C# developer and solution architect. ETL, high performant and resilient distributed systems are my primary fields of expertise. Can go bare or can go Claude-boosted, no vibe coding. What I love to do: ▶ Design and build high load or close-to-RT application/platform from scratch ▶Harness AI agents to cut implementation time 5x dedicating myself to architecture and problem solving ▶ Solve non-trivial performance tasks ▶ Debug, troubleshoot and refactor legacy projects ▶ Audit software solutions to spot potential scalability, performance, data consistency or operation problems. ▶ Integrate REST/Sockets APIs into your application, including crypto-parts (BTC, ETH, ERC-20 and others) My areas of expertise: ◉ C# NET full stack ◉ High load, distributed, close to RT systems architect ◉ Microsoft SQL Server ◉ External APIs of all sorts and complexity ◉ Cryptocurrencies essentials and integration ◉ HubSpot API (4+ years intensive usage in high load multi-tenant system) ◉ Clouds: AWS and Azure ◉ CI/CD: BitBucket, GitHub My background and skills: ★ 20+ years of experience in .NET software development ★ 5 years of software architecture design and implementation. ★ Highload backend solutions ★ 5 years of extensive experience in development team leading ★ Fluent written and spoken English ★ Computer science Bachelor degree in 2006 Career highlights through recent past: ★ Reworked HubSpot-targeting product that allowed business operation growth from 80 clients to 1000+; turned another PoC into production ready software serving hundreds of customers by now ★ Mission critical accounting software for customer from scratch, 10+ years in use by now ★ Fully automated cryptocurrency trading engine ★ Refactored spaghetti-coded legacy system to bring it to a competitive state and allow for implementing state of the art AI-driven features ★ Mission critical backend data management system from scratch ★ High load optimization for Oracle-based national telecom reporting tool Technologies I prefer to deal with: ☑ C# net10/9/8/6 ☑ Claude Code via custom harness for all the web UI prototypes ☑ Blazor, AspNetCore, AspNet MVC ☑ Legacy C# all the way down to NET 1.1 and ASPNET Forms ☑ EntityFramework (EFCore) and Dapper ☑ CI/CD via GitHub or BitBucket ☑ WPF/UWP mvvm style ☑ JavaScript/jQuery ☑ Microsoft SQL Server, SSRS Technologies out of my preferred list I still had significant experience with: ● RDBMS: Postgres 11-16, MySQL 4-8, Oracle 10g ● Node.js SPA

Production-grade mobile apps, web platforms, and AI systems built by a UK-based engineer with 20 years of experience and $100k+ earned on Upwork. I don't just write code. I take ownership of the full delivery: architecture, development, deployment, store submission, and the awkward bits in between like App Store rejections, Play Console policy appeals, and production debugging at 11pm when something breaks. I've navigated all of it, and I know how to avoid most of it before it happens. Fintech & Compliance Dalmore Group: Investment trading platform handling 10,000+ daily transactions. NestJS + PostgreSQL + BullMQ backend with XState state machines for the full trade cycle. AI document extraction on Azure Foundry processing paystubs, bank statements, and tax returns. KYC/AML compliant, 100% audit-ready. AI & Automation Swake: AI-powered in-app feedback SaaS (Canny competitor). SDKs for React Native, Ionic, and Web with no-code integration. NestJS + Cloudflare Workers. Docomi: AI customer support platform (Intercom competitor). Workflow-based chatbot with RAG pipeline, knowledge base built from websites, Notion, Zendesk, SharePoint, and documents. Supabase + pgvector for semantic search. Mobile Apps (React Native) MyDiabeticHealth: Diabetic health logging app, Expo + Supabase + RevenueCat, shipped to both App Store and Google Play. AxisCare: Period and ovulation tracker with Google Drive OAuth backup, EAS builds, full Play Store compliance. Vontrix VPN: Consumer VPN app with 1,000-server WireGuard infrastructure, BullMQ delta updates, AdMob + RevenueCat monetisation. SaaS Platforms Gymnastrio: Gym management SaaS with class booking, PT booking, and Stripe Connect multi-party payments. React + .NET Core + PostgreSQL. Missio: Secure NGO collaboration platform with real-time messaging. NestJS + React Native + React.js + BullMQ. Core stack: React Native . Expo . Next.js . ReactJs. NestJS . .NET Core . Node.js PostgreSQL . Supabase . Firebase . AWS . Cloudflare Workers . Docker . Claude . OpenAI . RAG . pgvector . MCP Servers . BullMQ . XState I lead all client communication and architecture decisions personally. I have a small senior team (in my agency), I work with for execution, which is how we move fast without dropping quality. Message me to schedule a free 20-minute technical review of your project.

Senior .NET Engineer with 11+ years of experience building FinTech platforms, payment systems, marketplace applications, and business automation solutions. My expertise spans the full software lifecycle—from architecture and backend development to cloud infrastructure and deployment. I specialize in C#, .NET, ASP.NET Core, Azure, SQL Server, Docker, React, distributed systems, and modern software architecture patterns. Over the years, I have built and maintained high-traffic platforms, payment gateways, wallet systems, trading and marketplace solutions, API integrations, and business process automation systems. I have extensive experience with microservices, CQRS, event-driven architectures, background processing, cloud-native applications, and performance optimization. I focus on building systems that are reliable, maintainable, and ready for long-term growth—not just delivering code that works today. Whether you need a new platform built from scratch, an existing system modernized, complex backend development, cloud architecture, or technical leadership for your project, I can help turn your requirements into a production-ready solution. Let's build something exceptional.