You will get a Next.js SaaS MVP with auth, database and Stripe subscriptions
Project details
Most MVPs do not fail because the code was bad. They fail because the wrong things were built first, and by the time anyone found out, the budget was gone.
I build the shape of the product before the surface of it. Tenants, users and roles come first, then the data model, then billing, then screens. Retrofitting teams or permissions into a live schema is the single most expensive early mistake, and it is the one I see most often in inherited codebases.
What you get is a product that runs in production, not a prototype: accounts and authentication, a real PostgreSQL database, Stripe subscriptions with webhook handling so plan status can never drift out of date, and a dashboard your users can actually use. Deployed, working, and yours.
I have done this end to end as the only developer on an early-stage startup: real-time chat, auth and Stripe payments, front to back. I also build AI features, so if that belongs in your product it can be part of this rather than a separate project later.
Stack: Next.js, React, TypeScript, Node.js, NestJS, PostgreSQL, Prisma, Supabase, Stripe, Vercel.
Message me before ordering and I will tell you which tier your idea actually needs.
I build the shape of the product before the surface of it. Tenants, users and roles come first, then the data model, then billing, then screens. Retrofitting teams or permissions into a live schema is the single most expensive early mistake, and it is the one I see most often in inherited codebases.
What you get is a product that runs in production, not a prototype: accounts and authentication, a real PostgreSQL database, Stripe subscriptions with webhook handling so plan status can never drift out of date, and a dashboard your users can actually use. Deployed, working, and yours.
I have done this end to end as the only developer on an early-stage startup: real-time chat, auth and Stripe payments, front to back. I also build AI features, so if that belongs in your product it can be part of this rather than a separate project later.
Stack: Next.js, React, TypeScript, Node.js, NestJS, PostgreSQL, Prisma, Supabase, Stripe, Vercel.
Message me before ordering and I will tell you which tier your idea actually needs.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$350
|
Standard
$600
|
Advanced
$1,000
|
|---|---|---|---|
| Delivery Time | 4 days | 6 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 5 | 12 | 20 |
Design Customization | - | ||
Content Upload | - | - | |
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$50 - $150
Additional Revision
+$50
AI feature: assistant or generation
+$200
30 days of post-launch support
+$150Frequently asked questions
About Vitaliy
Full-Stack Developer | AI SaaS, LLM Integration | React, Next.js, Node
Kyiv, Ukraine - 12:52 am local time
I'm Vitaliy, a full-stack developer with 3+ years of commercial experience shipping web products end to end: frontend, backend, database, deployment. My focus is applications with LLMs inside them, where the AI has to be reliable enough to actually ship.
━━━━━━━━━━━━━━━━━━
WHAT I BUILD
━━━━━━━━━━━━━━━━━━
▸ SaaS platforms and internal dashboards, from empty repo to production
▸ AI features grounded in real data: assistants, chat, report generation, document processing
▸ REST APIs, authentication, role-based access, Stripe subscriptions and payouts
▸ Third-party integrations and webhook pipelines that stay correct under retries
▸ Marketing sites and landing pages built for speed and Core Web Vitals
━━━━━━━━━━━━━━━━━━
STACK
━━━━━━━━━━━━━━━━━━
▸ Frontend: React, Next.js, Astro, TypeScript, Tailwind CSS, Redux, TanStack Query, Zod
▸ Backend: Node.js, NestJS, Express, REST APIs, JWT auth, webhooks
▸ Databases: PostgreSQL, Prisma, MongoDB, Supabase, Firebase
▸ AI: Anthropic API, xAI Grok API, LLM integration and prompt design
▸ Infrastructure: Cloudflare Workers, D1, Durable Objects, Vercel, Git
▸ CMS and payments: Strapi, WordPress, Stripe (Checkout + Connect)
━━━━━━━━━━━━━━━━━━
SELECTED WORK
━━━━━━━━━━━━━━━━━━
🔹 Money Track
An AI personal finance tracker. The interesting part is the guardrail: a deterministic core owns every number in the system, and a validation step blocks any figure the model did not get from the canonical SQL layer. The advisor explains and recommends, but it cannot invent a total. Bank sync over webhooks, per-user data isolation at the infrastructure level. Built with React, TypeScript, Cloudflare Workers, Durable Objects, D1, Hono, Anthropic API. Demo account included, no signup needed.
🔹 Answerly, early-stage startup
Sole developer. Built the whole product end to end: real-time chat between users, registration and auth, Stripe payments. React, Node.js, Firebase, Stripe.
🔹 PPC io
Full multi-page marketing site in Astro, solo, maintained for over a year. Later migrated all content from Strapi to Astro content collections, which removed an external dependency and simplified the build and deploy path.
🔹 Agency client work, since 2023
Next.js applications and marketing sites for a design agency: Stripe Checkout and Connect with payouts and webhook handling, PostgreSQL, Firebase, full ownership from Figma to production.
━━━━━━━━━━━━━━━━━━
HOW I WORK
━━━━━━━━━━━━━━━━━━
I use Claude Code every day, with my own workflows for building, refactoring and review. That is a speed advantage, not a substitute for engineering: I read what it produces, test it, and own the result either way. A model instruction is never a guarantee, a check is.
I ask the awkward questions early, when they are still cheap to answer, and I send updates you can react to instead of a silent two weeks.
Available 30+ hours per week, based in Ukraine (UTC+3), with solid overlap for European and US-morning calls.
If you're building a SaaS product or adding AI to one you already have, send me a message with what you're working on.
Steps for completing your project
After purchasing the project, send requirements so Vitaliy can start the project.
Delivery time starts when Vitaliy receives requirements from you.
Vitaliy works on your project following the steps below.
Revisions may occur after the delivery date.
Scope and schema
We agree what has to work on day one and what waits. Then I design the data model: tenants, users, roles and your core entities. This is the cheapest hour of the project and the one that prevents rewrites later.
Auth and foundation
Accounts, authentication, permissions and the deployment pipeline. By the end of this step there is a real application running on a real URL that you can log into, even though it does little yet.