You will get your Lovable app or any vibe code app ready for real users
Top Rated
Project details
Over the last few years, I have helped startups and solo founders turn AI-generated prototypes that barely hold together into clean, scalable, production-ready products.
If you have started building with Lovable, Bolt.new, Replit, Cursor, or similar AI tools, I step in where the AI stops. I refactor, extend, and harden your app using a production-grade stack, so it actually works under real users and real load.
What I can help you with:
• Clean up and debug unstable AI-generated codebases
• Refactor into modular, testable, long-term maintainable architecture
• Harden authentication flows, permissions, and row-level security
• Design reliable API boundaries between frontend, backend, and AI services
• Implement usage tracking, limits, and guardrails for AI features
• Control AI costs with rate limiting, caching, and scoped prompts
• Optimize database schemas, queries, and indexing for real traffic
• Migrate prototypes into scalable production systems without rewrites
Why clients hire me:
• 9+ years building and delivering real products
• Proven experience rescuing AI-generated apps before they collapse
• Fast execution without sacrificing code quality or scalability
If you have started building with Lovable, Bolt.new, Replit, Cursor, or similar AI tools, I step in where the AI stops. I refactor, extend, and harden your app using a production-grade stack, so it actually works under real users and real load.
What I can help you with:
• Clean up and debug unstable AI-generated codebases
• Refactor into modular, testable, long-term maintainable architecture
• Harden authentication flows, permissions, and row-level security
• Design reliable API boundaries between frontend, backend, and AI services
• Implement usage tracking, limits, and guardrails for AI features
• Control AI costs with rate limiting, caching, and scoped prompts
• Optimize database schemas, queries, and indexing for real traffic
• Migrate prototypes into scalable production systems without rewrites
Why clients hire me:
• 9+ years building and delivering real products
• Proven experience rescuing AI-generated apps before they collapse
• Fast execution without sacrificing code quality or scalability
AI Development Type
Deep Learning, Knowledge Representation, Model Tuning, Recommendation System, Software MaintenanceAI Tools
Keras, MLflow, OpenCV, PyTorch, TensorFlowAI Development Language
PythonWhat's included
| Service Tiers |
Starter
$200
|
Standard
$600
|
Advanced
$1,200
|
|---|---|---|---|
| Delivery Time | 4 days | 11 days | 21 days |
Number of Revisions | 1 | 2 | 5 |
AI Model Integration | |||
Detailed Code Comments | - | - | |
Knowledge Graph | - | - | - |
Model Documentation | - | ||
Ontology | - | - | - |
Source Code | |||
Taxonomy | - | - | - |
66 reviews
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RM
Rust M.
Jun 27, 2026
Mech AI Development | AI, Full stack Engineering
Really happy with the results. He understood the requirements quickly, handled both frontend and backend parts without issues, and was easy to work with the whole time. Highly recommend.
RM
Rust M.
Jan 19, 2026
Full Stack Engineer Needed for Angular/CapacitorJS Project Enhancements
It was a pleasure working with Nikunj throughout this project. He took full ownership of our AI-powered automotive platform and treated it like his own product, delivering meaningful, production-level improvements across both web and mobile.
What truly set him apart was his ability to understand the vision. He didn’t just focus on writing code or following tickets. He understood how the product is used, asked thoughtful questions, and challenged assumptions when something didn’t make sense. That approach led to better decisions and noticeable improvements in usability and system reliability.
On the technical side, he resolved critical issues, added new important features, and strengthened overall platform stability across devices. His work made the platform more dependable, easier to use, and better prepared for real users at scale.
If you’re looking for a senior-level full-stack freelancer who is comfortable with AI integrations, complex data flows, and real-world scalability challenges, I would strongly recommend him. We’d be more than happy to work with him again on future projects.
What truly set him apart was his ability to understand the vision. He didn’t just focus on writing code or following tickets. He understood how the product is used, asked thoughtful questions, and challenged assumptions when something didn’t make sense. That approach led to better decisions and noticeable improvements in usability and system reliability.
On the technical side, he resolved critical issues, added new important features, and strengthened overall platform stability across devices. His work made the platform more dependable, easier to use, and better prepared for real users at scale.
If you’re looking for a senior-level full-stack freelancer who is comfortable with AI integrations, complex data flows, and real-world scalability challenges, I would strongly recommend him. We’d be more than happy to work with him again on future projects.
BJ
Brian J.
Dec 12, 2025
You will get Cross-Platform Android & iOS mobile app using React Native & Angular/Ionic
Knowledgeable, proactive, and thorough. Highly skilled developer with strong problem solving skills. Highly recommended.
NJ
Niki J.
Oct 10, 2025
Update Android App
Nikunj was prompt with response and technically very good. We would recommend him, and will use him, again.
KY
Krishna Y.
Aug 25, 2025
Web developer (typescript, javascript, python, css)
Nik has implemented LLM and RAG features, integrated OpenAI/PyTorch components, and optimized our APIs for speed and reliability. His problem-solving, clean code, and proactive communication stand out. he worked independently and documented everything clearly. I would gladly hire him again for any GenAI, AI Agents work.
About Nikunj
Full Stack Developer React|Angular|Capacitor|Node|Python|AWS|AI expert
100%
Job Success
Surat, India - 12:22 am local time
I have successfully completed 50+ web projects and 30+ mobile applications while leading teams of up to 15 developers. I have also handled app store submissions, approvals, and rejections from start to finish.
➡️ What I Build & How I Work
I build scalable mobile, web, and AI-powered systems using React, Next.js, Angular, Node.js, NestJS, React Native, Ionic, Capacitor, and Python. My work includes SaaS platforms, multi-tenant systems, admin dashboards, AI workflows, real-time applications, and production mobile apps connected through shared backend architectures.
On the backend side, I develop scalable APIs and server-side systems using Node.js, NestJS, Express, Python, FastAPI, Django, and Flask. This includes JWT and OAuth authentication, RBAC, subscription billing, WebSocket-based real-time systems, audit logging, background jobs, third-party integrations, and REST APIs designed for long-term maintainability and scale.
On the mobile side, I build cross-platform applications with offline-first architecture, typed navigation, push notifications, deep linking, background sync, in-app purchases, and complete App Store / Play Store deployment workflows.
I work extensively with PostgreSQL, MySQL, MongoDB, Firebase, and Supabase, including Firestore, Realtime DB, Auth, Edge Functions, Storage, and FCM. My infrastructure experience spans AWS, GCP, Azure, DigitalOcean, Vercel, Firebase, and Supabase, where I focus on scalability, deployment pipelines, cloud optimization, and reducing infrastructure costs in growing applications.
I also modernize legacy systems, migrate Cordova apps to Capacitor, optimize Firebase infrastructure costs, and improve performance bottlenecks in scaling applications.
One area I specialize in is converting AI-generated or vibe-coded web apps from Lovable, Replit, Bolt, and similar platforms into production-ready mobile applications using Capacitor with native functionality and store deployment.
➡️ AI Development & Integrations
I build production-ready AI systems focused on solving real business and operational problems, not just adding chatbot features.
My work includes AI copilots, voice agents, intelligent search, workflow automation, and context-aware user experiences using OpenAI, Gemini, Claude, LangChain, LangGraph, Vapi, and ElevenLabs.
I develop scalable RAG pipelines, semantic retrieval systems, vector search, and agentic workflows that process large datasets, automate repetitive tasks, and deliver reliable, context-aware responses while optimizing performance, cost, and system reliability.
I also integrate AI into existing SaaS, web, and mobile products to improve support workflows, onboarding, reporting, document processing, and business automation.
➡️ Core Skills & Technologies
🎯Frontend Dev: React, Next.js, Angular, TypeScript, JavaScript, SaaS Dashboards, PWAs, RBAC
🎯Mobile Dev: React Native (CLI & Expo), Ionic, Capacitor, Cordova, iOS & Android Deployment, App Store Management
🎯Backend Dev: Node.js, Express, NestJS, Python, FastAPI, Django, Flask, REST APIs, WebSockets, GraphQL, JWT, OAuth
🎯Databases: PostgreSQL, MongoDB, MySQL, Firebase (Firestore, Realtime DB, Auth, Functions, FCM), Supabase (Auth, Realtime, Storage, Edge Functions)
🎯Cloud & Hosting: AWS, GCP, Azure, DigitalOcean, Vercel, Firebase, Supabase
🎯DevOps: GitHub Actions, Bitbucket CI, GitLab CI, Docker, CI/CD Pipelines, Environment Management, Cloud Monitoring
🎯AI Development: OpenAI, Gemini, Claude, LangChain, LangGraph, RAG Pipelines, Vector Search, Semantic Retrieval, Vapi, ElevenLabs
🎯AI Workflow Tools: Cursor, Claude Code, GitHub Copilot, Prompt Engineering, Lovable, Bolt, Replit, AI-Assisted MVP Development
➡️Why Clients Work With Me
- I build products designed to scale and survive real users, not just write code.
- Strong ownership throughout the entire process, from concept to MVP to production to scaling
- Balanced expertise across mobile, web, AI, and backend, so you do not need multiple developers
- Fast delivery using AI-assisted development without compromising code quality
- Real-world experience handling store rejections, performance bottlenecks, and infrastructure cost reduction
- Honest communication, reasonable deadlines, and no overpromising
Send me a brief description of what you are building, and I will come back with a clear view on approach, timeline, and fit.
Best wishes,
Nikunj
Steps for completing your project
After purchasing the project, send requirements so Nikunj can start the project.
Delivery time starts when Nikunj receives requirements from you.
Nikunj works on your project following the steps below.
Revisions may occur after the delivery date.
Quick Audit & Scope Lock
I will review your existing app, identify weak spots, and lock scope so there are no surprises later.
Stabilization & Refactor
Cleaning up AI-generated code, fix structural issues, and refactor for clarity and maintainability.