You will get Next.js + Supabase SaaS MVP | Full Stack Developer, MVP Development
Project details
I build production-ready SaaS MVPs on Next.js + Supabase + Stripe. Not a clickable prototype - a real app you can put in front of users on day 22.
What you get:
• Next.js 14 (App Router) frontend, TypeScript-strict
• Supabase auth with row-level security configured per role
• Stripe subscriptions (monthly + annual + customer portal)
• PostgreSQL schema designed for the actual product, not a tutorial
• Deployed to Vercel + monitored
• Documentation handover so your next dev can pick it up
This catalog is for founders/teams who already know what they want to ship. If you have a spec or designs, I can read them and start. If not, the first half-day is scoping before code.
17 years senior full-stack JS, Tech Lead at Interactivated Solutions (Top Rated Plus agency, 310+ contracts shipped). I work async with daily updates and ship in two-week iterations.
What you get:
• Next.js 14 (App Router) frontend, TypeScript-strict
• Supabase auth with row-level security configured per role
• Stripe subscriptions (monthly + annual + customer portal)
• PostgreSQL schema designed for the actual product, not a tutorial
• Deployed to Vercel + monitored
• Documentation handover so your next dev can pick it up
This catalog is for founders/teams who already know what they want to ship. If you have a spec or designs, I can read them and start. If not, the first half-day is scoping before code.
17 years senior full-stack JS, Tech Lead at Interactivated Solutions (Top Rated Plus agency, 310+ contracts shipped). I work async with daily updates and ship in two-week iterations.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$4,500
|
Standard
$8,500
|
Advanced
$15,000
|
|---|---|---|---|
| Delivery Time | 21 days | 35 days | 55 days |
Number of Revisions | 1 | 2 | 2 |
Number of Pages | 5 | 10 | 15 |
Design Customization | |||
Content Upload | - | - | - |
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$400
Additional Page
(+ 3 Days)
+$500
Extra integration
(+ 4 Days)
+$900Frequently asked questions
About Andrzej
Full Stack Developer | React, Next.js,TypeScript, Node.js | Full Stack
Mieczewo, Poland - 10:02 pm local time
17+ years of senior software engineering. Tech Lead on Full Stack JS builds - React, Next.js, TypeScript, Node.js - at Interactivated Solutions, a Top Rated Plus Upwork agency with 38,916 hours, 310+ contracts, 100% Job Success, and 200+ public reviews. The agency was named Most Reviewed Web Dev Company in the Netherlands (Clutch, 2024). My focus: production Full Stack web apps and SaaS platforms with senior engineering judgment and predictable delivery.
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⭐⭐⭐⭐⭐ "Andrzej came in as our Full Stack lead when we needed to ship a SaaS rebuild on a hard deadline. He stabilized the Next.js front-end, refactored the Node.js services, and got the team back to a clean two-week Full Stack iteration cadence. Senior, calm, and quick to flag risks before they became incidents." - Daniel R., Co-Founder
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Most Full Stack hires fail on senior judgment, not on the JS stack. A junior can wire React to a Node.js API. The hard part is Full Stack architecture decisions that survive feature growth, performance work that ships before users notice, and a TypeScript-strict codebase that catches drift before it hits production. Senior Full Stack work is about the trade-offs, not the framework picks.
Through Interactivated, my team has shipped Full Stack work for clients including Unilever (real-time multiplayer training platform for global remote teams), Vicrez (legacy storefront rebuilt as headless Next.js + Medusa + Strapi), and Nucona (cross-platform nutrition app with AI-driven recommendations and a browser extension). The agency's 310+ shipped contracts span healthcare, e-commerce, marketplaces, fintech, and enterprise. Senior Full Stack engineering depth on every project I take on, with the agency bench behind it.
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WHAT I DO
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▸ Full Stack SaaS and product builds - React or Next.js front-end, TypeScript-strict throughout, Node.js back-end, end-to-end ownership across data layer, services, and UI.
▸ Full Stack web apps - server-rendered Next.js, RSC patterns, edge functions, auth flows, payments integration, multi-tenant SaaS architecture.
▸ Full Stack APIs and back-end - Node.js, Express, Fastify, NestJS, REST and GraphQL, PostgreSQL data layer, AWS or Vercel infrastructure.
▸ Full Stack rescues - inheriting a stalled or broken Next.js or React codebase, stabilizing the build, untangling state management, getting the team back to shippable.
▸ Full Stack performance work - Core Web Vitals, bundle splitting, server-side caching, query tuning, real load testing on real data.
▸ Full Stack + AI integration - LLM features in production Full Stack apps, OpenAI and Anthropic API integration, RAG patterns wired in without breaking the rest.
▸ Full Stack team leadership - I lead Full Stack teams of 3-5 engineers, code-review heavy, TypeScript-strict, CI gates that catch the drift juniors miss.
▸ Web developer and react developer foundations across the full stack - WordPress developer experience for CMS integrations, mobile app developer capabilities with React Native for cross-platform builds when projects need it.
▸ Adjacent stack on Full Stack projects: Python, Ruby (past projects), Supabase, PostgreSQL, WebGL, plus React Native for cross-platform mobile when a project needs it.
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HOW I WORK
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Every full stack development engagement starts with a requirements session before a line of code is written. React and Next.js scope, Node.js architecture, and database design are agreed upfront so there are no surprises mid-build. I work async with daily updates, use Claude Code and AI tooling to move faster without sacrificing code quality, and deliver with documentation and a structured handoff so the codebase is maintainable after the engagement ends.
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MY PROCESS
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▸ Day 1-3: Full Stack discovery on the existing React, Next.js, or Node.js codebase or product spec, identifying load-bearing trade-offs.
▸ Week 1: stable Full Stack build, branch hygiene, CI gates, TypeScript-strict baseline.
▸ Weeks 2-4: feature shipping in two-week iterations. Code review before merge. Honest engineering trade-offs surfaced when they appear, not after.
▸ Continuous: working code in your repo end of day. You own the Full Stack codebase and every architecture decision is yours to question.
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Already have a project in mind? Send me a message - no brief or requirements needed. I will help you map out the scope, get a realistic estimate, and see exactly what is possible before committing to anything.
Steps for completing your project
After purchasing the project, send requirements so Andrzej can start the project.
Delivery time starts when Andrzej receives requirements from you.
Andrzej works on your project following the steps below.
Revisions may occur after the delivery date.
Scope review and setup
I review your materials, confirm the MVP scope, clarify edge cases, and set up the project structure, repo, environments, and delivery plan.
Database, auth, and roles
I design the Supabase/PostgreSQL schema, configure authentication, row-level security, and user roles based on the agreed product flow.