UseCortana
Multi-channel AI sales agent platform (AgentKong)
Real-time voice and text agents with an agentic CRM layer underneath. First commit to MVP in 4 weeks. First paying customer the month after.
Next.jsRestackLiveKit
Technical launch partner for founders
You should be selling. We will handle the build.
Built something with Lovable, Base44, Bolt, Cursor, or any AI tool? We turn your prototype into a production-ready SaaS with auth, billing, multi-tenancy, and everything you need to scale.
- 35+Projects Delivered
- Top Rated PlusOn Upwork
- 5+Years Building SaaS
FusionSync is an AI SaaS development agency that helps founders turn no-code prototypes into production software. We build AI SaaS MVPs, agentic platforms, and multi-tenant systems with auth, billing, architecture, and deployment using Next.js, TypeScript, PostgreSQL, Stripe, OpenAI, Claude, LiveKit, and Restack.
PrototypeProduction SaaS
Shubham Kashyap
Founder, FusionSync
Top Rated Plus on Upwork
(35+ projects)
From Prototype to Production. We Handle It All.
Prototype
AI-generated or no-code MVP
Architecture
Scalable, secure, and reliable
Core Features
Backend, APIs, and integrations
Production Ready
Auth, billing, multi-tenant, deployment
Scale & Grow
Analytics, automation, and optimization
If you built something in Lovable, Base44, Bolt, or Claude, and you are not sure it can survive real users, that is where we come in.
We handle auth, billing, architecture, multi-tenancy, and deployment. You focus on talking to customers and closing deals.
Shipped products
Real software in production, not mockups
Three builds we shipped from first commit to paying users. Dashboards, auth, billing, and AI integrations included.
4 weeks to MVP
IGThreadly
Instagram comment and DM automation SaaS
Turns inbound social activity into qualified, CRM-ready leads with AI intent routing and multi-turn agent inbox.
Next.jsMeta Graph APIOpenAI
View product page →
MeisterFlow
Multi-tenant booking and invoicing platform
Scheduling, multi-tenant data isolation, and automated billing for a home-services client. Active in production today.
Next.jsPostgreSQLStripe
What we build
Three kinds of AI software products
Pick the shape of product you need. We architect and ship the full stack, not a thin integration layer.
AI SaaS and MVPs
Auth, Stripe billing, admin panels, and real AI features wired into a product your users can log into on day one.
MVPEarly SaaSStripeAuth
Agentic voice and chat platforms
Voice plus text agents, agentic CRM logic, multi-channel orchestration, and production call infrastructure.
LiveKitVoice AIAgentic CRMRestack
Multi-tenant production systems
Tenant isolation, permissions, monitoring, and deployment infrastructure built before feature count grows.
Multi-tenantPostgreSQLPrismaVercel
Why founders choose us
Built for production, not demo day
Architecture first
Database structure, multi-tenancy, scalability, security, and expansion paths are designed before development starts.
Production ready
Auth, billing, monitoring, error handling, permissions, and deployment infrastructure from day one. Not a prototype that breaks under real users.
AI-assisted engineering
Cursor, Claude, and modern AI tooling accelerate delivery without sacrificing architecture quality. Structured engineering, not vibe coding.
Engagement tiers
Clear scope, clear timeline, clear price band
Every tier ships deployed and live. Start selling faster without hiring a dev team first.
Tier 1 · Validation / Proof of Concept
$500–1,500
From 3 days to 1 week
Single core workflow, one user type, basic AI integration, deployed live. Built so you can sell and test demand fast.
Tier 2 · MVP / Early SaaS
$2,000–3,000
2 weeks
Multi-feature product, auth, Stripe billing, multi-tenant architecture if needed, real AI integration.
Tier 3 · Full Agentic Platform
$4,000–5,000
3 weeks
Voice and text AI agents, agentic CRM logic, multi-channel orchestration, full production architecture.
How we work
Architecture → build → deploy
Three phases. No six-month discovery deck. You get a working product with the plumbing already in place.
- Step 1
Architecture
System design, data model, tenancy model, integrations, and delivery plan locked before code ships.
- Step 2
Build
Feature development with AI-assisted velocity and production-grade patterns: auth, billing, AI layers, and UI.
- Step 3
Deploy
Live on Vercel (or your stack), monitoring in place, handoff docs, and a product ready for real users.
Tech stack
The stack we ship on
- Next.js
- React
- Node.js
- TypeScript
- PostgreSQL
- Prisma
- Supabase
- Stripe
- OpenAI API
- Claude API
- LiveKit
- Restack
- Vercel
Built by a team
Shubham leads delivery. The team ships the product.
Shubham Kashyap
CEO · FusionSync
- Top Rated Plus on Upwork
- 35+ projects shipped
- Production AI SaaS and agentic platforms
- Shubham leads every engagement
Work with me on Upwork
Ready to ship a product your customers can pay for?
Work with me on Upwork. Bring your prototype, your buyers, and your timeline. I will map scope before you commit.
Frequently asked questions
What founders ask before booking a build call: ownership, stack, tiers, and how we differ from generic agencies.