You will get Build Your Next.js Web Application
Project details
I will build a custom Next.js Web Application for your SaaS product, business portal, marketplace, dashboard, or internal tool. I can handle the frontend, backend logic, database, authentication, APIs, dashboards, and deployment. Your Web Application Development can include TypeScript, JavaScript, Supabase, and PostgreSQL, with the complete application prepared for real users rather than only a basic prototype.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included $2,000
These options are included with the project scope.
$2,000
- Delivery Time 3 days
- Number of Revisions 0
Frequently asked questions
2 reviews
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KC
Kelly C.
Jul 31, 2026
Build a Premium Member Portal for a Fitness Coaching App (Passion.io Integration)
⭐⭐⭐⭐⭐
I cannot recommend Neven highly enough.
He didn’t just build what I asked for—he genuinely brought my vision to life. What started as an idea in my head has become something far better than I imagined. Throughout the project he suggested improvements and features I hadn’t even considered, while always keeping the project focused on what mattered most.
His communication has been exceptional from start to finish. Every question was answered quickly, everything was explained clearly, and despite me refining ideas as we went, he was always patient, professional and positive.
The quality of his work has exceeded every expectation. The portal is beautifully designed, intuitive, fast and exactly what my members needed. You can tell he genuinely cares about delivering an outstanding product, not just completing a contract.
Finding someone who combines technical skill with creativity, reliability and excellent communication is rare. Neven has all of those qualities.
I already know this won’t be our last project together. If you’re looking for a developer who treats your business like it’s his own and genuinely wants your project to succeed, don’t hesitate to hire him.
Thank you, Neven. You’ve helped turn one of my biggest business dreams into a reality.
I cannot recommend Neven highly enough.
He didn’t just build what I asked for—he genuinely brought my vision to life. What started as an idea in my head has become something far better than I imagined. Throughout the project he suggested improvements and features I hadn’t even considered, while always keeping the project focused on what mattered most.
His communication has been exceptional from start to finish. Every question was answered quickly, everything was explained clearly, and despite me refining ideas as we went, he was always patient, professional and positive.
The quality of his work has exceeded every expectation. The portal is beautifully designed, intuitive, fast and exactly what my members needed. You can tell he genuinely cares about delivering an outstanding product, not just completing a contract.
Finding someone who combines technical skill with creativity, reliability and excellent communication is rare. Neven has all of those qualities.
I already know this won’t be our last project together. If you’re looking for a developer who treats your business like it’s his own and genuinely wants your project to succeed, don’t hesitate to hire him.
Thank you, Neven. You’ve helped turn one of my biggest business dreams into a reality.
MC
Milan C.
Mar 5, 2026
Single Page Website for Shopify Store
Everything went smoothly from start to finish. The freelancer understood the requirements quickly and delivered exactly what was needed. Very satisfied with the result.
About Neven
SaaS Focused Full-Stack Developer | Next.js, Supabase & PostgreSQL
71%
Job Success
Rasa, Croatia - 12:44 am local time
I help businesses and SaaS founders with Full-Stack Development, Web Application Development, Backend Development, API Development & Integration, and AI Integration.
My focus is not only on making your application work.
I structure the backend, database, authentication, payments, APIs, and security properly so your product is easier to maintain and scale as your business grows.
This Full-Stack Development approach allows me to handle the entire application instead of leaving you to coordinate separate frontend, backend, and database developers.
I can build your SaaS platform from scratch, improve an existing application, fix weak backend architecture, or migrate your product from Bubble, Passion, or another no-code platform to a custom stack.
𝙃𝙚𝙧𝙚’𝙨 𝙬𝙝𝙖𝙩 𝙄 𝙘𝙖𝙣 𝙝𝙚𝙡𝙥 𝙮𝙤𝙪 𝙬𝙞𝙩𝙝:
𝟭. 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗦𝗮𝗮𝗦 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁
🔹 Full-Stack Development with Next.js, React, TypeScript, and Node.js
🔹 Custom SaaS Development and MVP Development
🔹 Web Application Development for dashboards, portals, and marketplaces
🔹 Multi-tenant SaaS architecture
🔹 Admin panels, client portals, and role-based dashboards
🔹 Responsive frontend development with Tailwind CSS
🔹 Scalable Software Architecture
🔹 Cloud Deployment & Hosting with Vercel or Netlify
𝟮. 𝗕𝗮𝗰𝗸𝗲𝗻𝗱, 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 & 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆
🔹 Backend Development with Node.js, NestJS and Supabase
🔹 PostgreSQL Database Design & Management
🔹 Supabase Auth, Row-Level Security and Edge Functions
🔹 Authentication & Authorization with role-based access
🔹 Secure multi-tenant database architecture
🔹 Application Security and RLS policy hardening
🔹 SECURITY DEFINER function audits
🔹 Prisma and Redis implementation
🔹 Performance and query optimization
𝟯. 𝗔𝗣𝗜𝘀, 𝗣𝗮𝘆𝗺𝗲𝗻𝘁𝘀 & 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀
🔹 API Development & Integration
🔹 REST API development and third-party API integrations
🔹 Stripe & Payment Integration
🔹 Stripe Connect payment splitting for marketplaces
🔹 Subscription and recurring payment systems
🔹 Email integration with Resend
🔹 KYC and identity verification with Didit
🔹 Webhooks, scheduled jobs and serverless functions
🔹 API orchestration between multiple business systems
𝟰. 𝗔𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻
🔹 AI Integration inside SaaS platforms and web applications
🔹 AI-powered document reading and data extraction
🔹 OpenAI and Claude API integrations
🔹 Python & Workflow Automation
🔹 Scheduled data processing pipelines
🔹 AI-powered search, matching, and recommendation features
🔹 Automated reporting and third-party data processing
𝟱. 𝗘𝘅𝗶𝘀𝘁𝗶𝗻𝗴 𝗔𝗽𝗽𝘀 & 𝗠𝗶𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀
🔹 Full-Stack Development support for existing products
🔹 Backend Development fixes and architecture improvements
🔹 Supabase security audits and RLS cleanup
🔹 Web Application Development updates and new features
🔹 Migration from Bubble, Webflow or Passion
🔹 Database migration to PostgreSQL or Supabase
🔹 Rebuilding unstable no-code products with a custom stack
🔹 Ongoing maintenance, debugging and feature development
𝙎𝙤𝙢𝙚 𝙤𝙛 𝙩𝙝𝙚 𝙥𝙡𝙖𝙩𝙛𝙤𝙧𝙢𝙨 𝙄 𝙝𝙖𝙫𝙚 𝙗𝙪𝙞𝙡𝙩:
✈️ A flight cost-sharing marketplace with Stripe Connect, KYC verification, and role-based Supabase security
📦 An AI-powered inventory management platform for cafés, bars, and restaurants
🚛 A logistics command center with driver tracking, load matching, and real-time scheduling
🏋️ A member portal for a fitness coaching business with 400+ paying members
📄 A sales proposal and client management SaaS platform used in daily business operations
These projects required Full-Stack Development, Backend Development, Web Application Development, API Development & Integration, AI Integration, and secure database architecture.
𝙏𝙤𝙤𝙡𝙨:
Next.js | React | TypeScript | JavaScript | Node.js | NestJS | Supabase | PostgreSQL | Prisma | Redis | Stripe | Stripe Connect | Tailwind CSS | Python | Vercel | Netlify | Git | GitHub | Cursor | Claude Code | Resend | Didit
𝙄𝙛 𝙮𝙤𝙪 𝙣𝙚𝙚𝙙 𝙝𝙚𝙡𝙥 𝙗𝙪𝙞𝙡𝙙𝙞𝙣𝙜 𝙖 𝙎𝙖𝙖𝙎 𝙥𝙡𝙖𝙩𝙛𝙤𝙧𝙢, 𝙘𝙪𝙨𝙩𝙤𝙢 𝙬𝙚𝙗 𝙖𝙥𝙥𝙡𝙞𝙘𝙖𝙩𝙞𝙤𝙣 𝙤𝙧 𝙨𝙚𝙘𝙪𝙧𝙚 𝙗𝙖𝙘𝙠𝙚𝙣𝙙, 𝙨𝙚𝙣𝙙 𝙢𝙚 𝙖 𝙢𝙚𝙨𝙨𝙖𝙜𝙚 𝙖𝙣𝙙 𝙩𝙚𝙡𝙡 𝙢𝙚 𝙬𝙝𝙖𝙩 𝙮𝙤𝙪 𝙬𝙖𝙣𝙩 𝙩𝙤 𝙗𝙪𝙞𝙡𝙙.
Steps for completing your project
After purchasing the project, send requirements so Neven can start the project.
Delivery time starts when Neven receives requirements from you.
Neven works on your project following the steps below.
Revisions may occur after the delivery date.
DM before you buy
Before you buy, DM me so we can see if this is good for you! You might not need it, and the call/DM is free!