Hoai T.

Senior Full Stack Developer | Next.js, Nest.js, C# | SaaS, Fintech, AI

🏆 Top-Rated Developer (Top 10% on Upwork) | 6+ Years | 40+ Project Launched. I have successfully launched MVPs in FinTech, E-commerce, and IoT, serving thousands of active users and handling millions of transactions. I am a Senior Full-Stack Developer with 6+ years of experience specializing in turning complex ideas into market-ready SaaS products. Why work with me? I am not an agency. I take full ownership of your project from the first line of code to deployment. My CoreTech Stack: Frontend: Next.js (ISR/SSR optimization), React, Vue.js, TypeScript, Tailwind CSS. Backend: Nest.js, Node.js, .NET, Microservices. Database & Security: PostgreSQL (RLS Specialist), MySQL, Redis, Supabase, Firebase. Infrastructure: AWS (EC2, S3, RDS, Lambda), Docker, CI/CD pipelines. Expertise for Your MVP: - Multi-Tenancy & RBAC: Implementing complex Role-Based Access Control and tenant isolation at the database level. - High-Performance Systems: Experience building high-frequency trading tools with sub-second latency and real-time data processing. - Third-Party Integrations: Expert in API Gateways, Payment Gateways (Stripe), and real-time communication via RabbitMQ or WebSockets. Featured SaaS Successes: - YesWeBook (Vietnam): Built an industry-leading B2B CRM for 500+ salons, resulting in a 40% increase in bookings - Enterprise Copy Trade: Developed a microservices-based FinTech platform for 1,000+ active traders - OnPoint E-commerce: Engineered a SaaS analytics dashboard with BI reporting and marketing automation Keyworks: Full Stack Developer , Backend Developer, Frontend Developer, React developer MERN developer, SaaS MVP Development, Multi-tenant Architect, PostgreSQL RLS, Supabase, Next.js Developer, NestJS Developer, Microservices, FinTech Developer, HealthTech, IoT Backend, Low-Latency Systems, Event-Driven Design, Elasticsearch, RabbitMQ, RBAC, CI/CD, AWS Developer, Clean Architecture, Product Development, Startup SaaS Specialist.