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Fiverr Pro
English
$
USD
I will build full stack mobile app with ai integration, chat bot, admin, payments
Neeraj B
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About this gig
Tired of hiring one freelancer for frontend, another for backend, and a third for deployment only to end up with code that doesn't connect?
I build the entire app. Frontend, backend, AI, payments, deployment one developer, one codebase, everything works together from day one.
I've built and shipped a full AI-powered SaaS platform (live in production) solo 20+ screens, 80 AI agents, real-time chat, multi-currency payments across 166 countries, and an astronomical prediction engine. This isn't a portfolio mockup. It's running in production right now.
What I deliver:
React Native mobile app for Android and iOS from a single codebase
Go backend with REST API, PostgreSQL, Redis caching, and JWT authentication
Real-time chat system using MQTT with typing indicators and read receipts
AI integration Claude or OpenAI powered chatbot, AI agents with memory and persona
Payment system Stripe, Razorpay, or Dodo with webhook verification and wallet
Push notifications via Firebase
Admin dashboard for managing users, content, and analytics
App Store and Play Store submission with screenshots and metadata
Clean, documented source code you fully own
Docker deployment on your server or cloud.
Get to know Neeraj B
Neeraj B
- FromIndia
- Member sinceSep 2025
Languages
English, Hindi
Full-stack engineer at a leading hedge fund solutions company. I build production systems daily — Go microservices, React Native apps, Python APIs, and complex SQL/Spark analytics on massive datasets.
I specialize in AI/LLM products: prompt engineering, conversational agents, safety layers, and A/B testing that drive real metrics like ARPU and retention.
Also run my own product studio — I think like a founder. Fast iterations, data-driven decisions, ship-first mindset.
Go · Python · React Native · SQL · Kafka · K8s · Docker · LLM · Prompt Engineering
Production-ready work, not prototypes.
My Portfolio
FAQ
Do you build both the mobile app and the backend?
Yes. I build everything — React Native frontend (Android + iOS), Go backend with REST API and PostgreSQL database, real-time chat via MQTT, payment integration, admin panel, and deployment. You get one developer handling the full stack, so everything works together from day one. No handoff issues.
Can you add AI features like a chatbot or AI agent to my app?
Absolutely. I integrate Claude (Anthropic) or OpenAI into your app — whether it's a conversational chatbot, an AI assistant with memory and persona, content recommendations, or intelligent automation.
Do I get the source code?
Source code is included in the Standard and Premium packages. For Basic, you can add it as an extra. You get full ownership of all code — frontend, backend, and any AI prompt configurations. Everything is clean, documented, and ready for your team to maintain or extend.
Will my app work on both Android and iOS?
Yes,packages include both Android and iOS from a single React Native codebase. One codebase means faster development, lower cost, and easier maintenance compared to building two separate native apps.
Can you integrate payments like Stripe or Razorpay?
Yes. I build complete payment systems — Stripe, Razorpay, or Dodo — with secure webhook verification, wallet functionality, subscription billing, and multi-currency support. I've built payment infrastructure handling 166 currencies with PPP-based pricing in production.
Do you handle app store submission?
App Store and Play Store submission is included in the Premium package. For other packages, it's available as an extra. I handle everything — building the production release, creating screenshots, writing store metadata, configuring certificates, and submitting for review.
What if my project is bigger than your packages?
Message me with your requirements. Most real projects don't fit neatly into packages — I'll review your scope, break it into milestones, and send you a custom offer with exact pricing, timeline, and deliverables. No guesswork, no surprises mid-project.
Do you provide support after delivery?
The Premium package includes 30 days of post-launch support for bug fixes and minor adjustments. For Standard and Basic, I offer a paid maintenance add-on. I also ensure clean handoff — documented code, deployment instructions, and environment setup guide — so your team can take over confidently.
How do you handle communication during the project?
I send regular updates with screenshots and demo builds you can test on your phone. I'm available on Fiverr chat daily and typically respond within an hour. For larger projects, I break work into weekly sprints so you see progress and can give feedback at every stage.
Can you build a real-time chat feature inside my app?
Yes — it's one of my core strengths. I build real-time messaging using MQTT with typing indicators, read receipts, message reactions, media sharing (images and audio via HTTP upload + MQTT notification), and persistent chat history. I've built and run this in production at scale.
