Sagar C.

I build custom business software, SaaS platforms, backend systems, and AI-powered applications that solve real business problems. With $100K+ earned and 5,281 hours worked on Upwork, I help startups and established businesses turn ideas and complex workflows into reliable, production-ready software. Whether you need a SaaS product built from scratch, a custom business management system, a scalable backend, or AI integrated into an existing application, I can help you design and develop the right solution. ━━━━━━━━━━━━━━━━━━━━ WHAT I HELP BUSINESSES BUILD CUSTOM BUSINESS SOFTWARE When off-the-shelf software doesn't fit your workflow, I build applications around the way your business operates. • Custom Business Applications & Internal Tools • CRM & Business Management Systems • Customer, Vendor & Employee Portals • Admin Dashboards, Reporting & Analytics • Real-Time Tracking & Monitoring Systems • Workflow Automation & Data Management • Third-Party API Integrations SAAS & SOFTWARE PRODUCT DEVELOPMENT I help startups and businesses build new software products, launch MVPs, and improve existing applications. • SaaS MVP Development • B2B SaaS & Multi-Tenant Platforms • Custom Web Applications • Existing SaaS Development & V2 Upgrades • User Authentication, Roles & Permissions • Subscription & Billing Systems • Booking & Appointment Platforms • Marketplaces & Multi-Vendor Platforms • Dashboards & Business Analytics BACKEND DEVELOPMENT & API ENGINEERING I build the backend systems that power business applications and software products. • Node.js, Express.js & NestJS Development • Laravel & PHP Backend Development • REST API Design & Development • Database Architecture & Optimization • Authentication & Role-Based Access Control • Payment Gateway & Third-Party Integrations • Webhooks, Background Processing & Automation • Backend Maintenance, Debugging & Refactoring AI INTEGRATION & WORKFLOW AUTOMATION I integrate AI into applications and business workflows to reduce manual work, improve information access, and automate repetitive processes. • OpenAI, Anthropic Claude & Gemini Integrations • AI Assistants & Chatbots • AI Agents & Tool-Calling Workflows • Retrieval-Augmented Generation (RAG) • Document Processing & Data Extraction • AI-Powered Search • API-Based Workflow Automation My focus is on integrating AI into practical applications that solve real business problems. INDUSTRY EXPERIENCE I've developed software across healthcare and HealthTech, marketplaces, property management, logistics, education, testing and assessment, and business operations. My healthcare work includes Orvo and Holism, covering healthcare marketplaces, patient and provider workflows, appointment booking, and healthcare management. Other projects include: • Delivery Management Platforms • Logistics Management Systems • Real-Time Progress Tracking Software • Testing & Assessment Platforms • Property Management Systems • Healthcare Management Applications • Marketplace & Multi-Vendor Platforms • Custom Business Applications TECHNOLOGY STACK Backend: Node.js, Express.js, NestJS, Laravel, PHP Frontend: React.js, Next.js, TypeScript, JavaScript, Tailwind CSS Databases: PostgreSQL, MySQL, MongoDB AI: OpenAI, Anthropic Claude, Gemini, RAG APIs & Integrations: REST APIs, Webhooks, Stripe, PayPal, Twilio, Google APIs Cloud & Infrastructure: AWS, DigitalOcean, Cloudflare I choose technologies and architecture based on each project's requirements, focusing on maintainability, reliability, and long-term growth. WHY WORK WITH ME? • Business-Focused Development That Solves Real Problems • Clean, Maintainable & Well-Structured Code • Reliable API Design & Third-Party Integrations • Full-Stack Understanding of Backend and Frontend Systems • Practical Technical Decisions Without Unnecessary Complexity • Focus on Security, Performance & Long-Term Maintainability LET'S DISCUSS YOUR PROJECT Whether you're launching a SaaS product, building custom business software, developing APIs, integrating AI, or improving an existing application, I can help you move forward. Send me a message describing what you're building, your current technology stack, and the main challenge you're facing. Let's discuss the best approach for your project.