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thekevinkun

Kevin Mahendra

@thekevinkun

Full Stack Developer Building AI SaaS and Booking Platform with Payment Systems

Indonesia
English
About me
Hi, I'm Kevin, a Full Stack Developer specializing in AI SaaS, booking platforms, and payment systems. I build production-ready web applications using Next.js, TypeScript, PostgreSQL, and modern backend technologies. My experience includes multi-tenant SaaS platforms, AI-powered assistants, booking systems, Stripe and Midtrans integrations, and real-time applications. I focus on clean architecture, secure integrations, and reliable user experiences that work in real-world conditions.... Read more

Skills

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thekevinkun
Kevin Mahendra
Offline • 

See my services

Full Stack Web Applications
I will develop a custom full stack web application with nextjs
From$90 / projectMore details
Full Stack Web Applications
I will build a modern ecommerce website with ai assistant
From$55 / projectMore details

Portfolio

Work experience

GitHub

Full Stack Developer

GitHub • Self-employed

Dec 2018 - Present • 7 yrs 7 mos

Payment System Reliability (Padel Court) Built a booking platform with Midtrans payments, webhook validation, payment verification, and idempotency protection to ensure reliable transaction processing. Real-Time Booking Availability (Padel Court) Developed a real-time scheduling system with live availability updates and consistent booking state management. Multi-Tenant AI SaaS Platform (Kundesk) Built a customer service SaaS that enables businesses to deploy document-trained AI assistants with subscription billing and tenant isolation. RAG-Powered AI Assistant (Kundesk) Implemented KUN, an AI assistant powered by RAG, embeddings, and vector search, with real-time human handoff between AI and support staff. Secure Digital Commerce Platform (Kun Bookshop) Built a digital bookstore with Stripe payments, secure file delivery, JWT authentication, and protected access to purchased content.