You will get Backend Development | Backend API with Node.js | NestJS | Express.js
Top Rated
Top Rated
Project details
Looking for a professional backend developer to build a high-performance, secure, and scalable backend for your web or mobile app?
You’re in the right place!
With proven expertise in backend development, I specialize in creating reliable and maintainable server-side solutions tailored to your business needs. From building RESTful APIs to integrating complex databases and deploying scalable services, I provide complete backend support to power your project from start to finish.
✅ What I Offer:
=> Backend development using Node.js, NestJS, and ExpressJS
=> Custom RESTful API development
=> MongoDB and MySQL database integration
=> Scalable server-side logic implementation
=> Third-party API integration (e.g., Stripe, Firebase, etc.)
=> Clean, maintainable, and secure code
Technologies I Use:
• Node.js
• NestJS
• ExpressJS
• MongoDB
• MySQL
• JavaScript / TypeScript
Let’s build a powerful backend system that drives your app’s performance.
Ready to get started? Let’s talk!
You’re in the right place!
With proven expertise in backend development, I specialize in creating reliable and maintainable server-side solutions tailored to your business needs. From building RESTful APIs to integrating complex databases and deploying scalable services, I provide complete backend support to power your project from start to finish.
✅ What I Offer:
=> Backend development using Node.js, NestJS, and ExpressJS
=> Custom RESTful API development
=> MongoDB and MySQL database integration
=> Scalable server-side logic implementation
=> Third-party API integration (e.g., Stripe, Firebase, etc.)
=> Clean, maintainable, and secure code
Technologies I Use:
• Node.js
• NestJS
• ExpressJS
• MongoDB
• MySQL
• JavaScript / TypeScript
Let’s build a powerful backend system that drives your app’s performance.
Ready to get started? Let’s talk!
Programming Languages
JavaScript, ASP.NET, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$100
|
Standard
$500
|
Advanced
$1,500
|
|---|---|---|---|
| Delivery Time | 3 days | 8 days | 12 days |
Number of Revisions | 1 | 3 | Unlimited |
Number of Pages | 1 | 5 | 15 |
Design Customization | |||
Content Upload | - | ||
Responsive Design | - | ||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$50 - $70
Additional Revision
+$100
Additional Page
(+ 1 Day)
+$50Frequently asked questions
4 reviews
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IS
IT S.
May 13, 2026
Dynamic Configuration Tool
Devansh is a skilled Full Stack Developer who delivered solid work throughout the project. He handled both frontend and backend tasks effectively and showed good technical knowledge, problem-solving skills, and attention to detail.
He communicated clearly during the project, was receptive to feedback, and delivered tasks on time. Working with him was professional and smooth overall.
He communicated clearly during the project, was receptive to feedback, and delivered tasks on time. Working with him was professional and smooth overall.
AM
Ashish M.
Mar 31, 2026
Contract for Milestone1
Devansh is great to work with. He had a great UI/UX that he showcased for our solution. Really liked working with him. Will defiantly use him again in the future.
AM
Ashish M.
Nov 24, 2025
🛡️ Build GovShield iQ — an AI-Driven Phishing & Compliance Dashboard for Government Agencies
Devansh is great to work with. I'd highly recommend him for any Fullstack development, UI development work.
KS
Kate S.
Oct 15, 2025
Full Stack Developer (React + Node.js) – Fix Scheduling Module Crashing in Learning Management
Devansh did an excellent job fixing a critical issue in our LMS Scheduling Module. He quickly identified the root cause, implemented a stable solution, and ensured everything ran smoothly without affecting other parts of the system. Devansh has Great communication, deep technical expertise, and very reliable , highly recommended!
About Devansh
AI Engineer | Senior AI Engineer | Full Stack AI Developer
100%
Job Success
Kadi, India - 11:20 pm local time
What makes me different from many AI Engineers is my ability to build both the AI layer and the product around it. Most AI Engineers focus only on models and APIs. Most Full Stack Developers focus only on applications. I do both. This allows me to build complete AI-powered products using Python, FastAPI, Node.js, React, Next.js, TypeScript, PostgreSQL, MongoDB, AWS, Azure, Docker, and Kubernetes.
Beyond technical depth, what separates me from other AI Engineers is how I approach a project. I do not start with tools or frameworks. I start with your business problem. I ask what is actually slowing your team down, where decisions are being made manually that AI could handle, and what a working system needs to do on day one in production.
As an AI Engineer, I have built:
• AI Agents and Agentic Workflows
• Multi-Agent Systems
• RAG Applications
• AI Copilots
• AI Chatbots
• Voice AI Systems
• AI Search Engines
• Recommendation Systems
• AI-Powered SaaS Platforms
• Enterprise AI Applications
• CRM and ERP AI Integrations
• AI Automation Platforms
My AI Engineer expertise includes LangChain, LlamaIndex, CrewAI, AutoGen, OpenAI, Claude, Gemini, LLaMA, Mistral, DeepSeek, Hugging Face, Amazon Bedrock, and Ollama. I design systems that combine reasoning, memory, tool usage, workflow orchestration, and external integrations to automate complex business operations.
I specialize in Retrieval-Augmented Generation (RAG) systems, vector databases, semantic search, document processing, knowledge management, and enterprise AI assistants. These solutions help organizations unlock internal knowledge and improve decision-making through AI.
As an AI Engineer, I also work extensively with model optimization and fine-tuning. My experience includes LoRA, QLoRA, PEFT, prompt engineering, evaluation frameworks, structured outputs, function calling, model routing, and production inference optimization.
Voice AI is another area of expertise. I build conversational AI and voice agents using Vapi, Deepgram, Whisper, Azure AI Speech, and Amazon Polly. These systems support customer service, appointment scheduling, lead qualification, and workflow automation.
My Full Stack AI Development expertise:
Backend: Python, FastAPI, Django, Flask, Node.js, Express, NestJS
Frontend: React.js, Next.js, TypeScript, Tailwind CSS
Databases: PostgreSQL, MySQL, MongoDB, Redis
Cloud & Infrastructure: AWS, Azure, Docker, Kubernetes, CI/CD, Microservices
𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐓𝐨𝐨𝐥𝐬:
➤ Cursor, Cline, GitHub Copilot, Claude Code
➤ ChatGPT, v0.dev, Bolt.new
➤ Replit Ghostwriter, Codeium, Tabnine
➤ n8n, Zapier, Make (Integromat)
➤ MCP Servers & AI Agent Integrations
I approach every engagement as an AI Product Engineer rather than simply an AI Developer. I assess workflows, identify high-impact opportunities, design scalable architectures, and deliver AI systems that teams can confidently operate and scale. My AI Engineer solutions have helped businesses automate operations, improve customer experiences, increase productivity, and launch AI-powered products faster.
If you are looking for an AI Engineer who can architect the solution, build the AI systems, develop the full-stack application, and support long-term growth, I'd be happy to discuss your project.
AI Engineer | Senior AI Engineer | LLM Engineer | AI Agent Developer | Agentic AI Engineer | Multi-Agent AI Engineer | RAG Engineer | Generative AI Engineer | AI Automation Engineer | AI Product Engineer | OpenAI Engineer | Claude AI Engineer | LangChain Developer | LlamaIndex Developer | CrewAI Developer | AutoGen Developer | Full Stack AI Developer | Voice AI Engineer | Conversational AI Engineer | Enterprise AI Engineer | AI SaaS Developer | AI Chatbot Developer | AI Copilot Developer | LLaMA Engineer | Mistral Engineer | Prompt Engineer | Vector Database Engineer | Qdrant Developer | AI Backend Engineer | Python AI Engineer | FastAPI Developer | NestJS AI Developer | AI Cloud Engineer | AWS AI Engineer | Azure AI Engineer | Document AI Engineer | Knowledge Base Engineer | AI API Developer | Hugging Face Engineer | Ollama Developer | AI DevOps Engineer | Production AI Engineer
Steps for completing your project
After purchasing the project, send requirements so Devansh can start the project.
Delivery time starts when Devansh receives requirements from you.
Devansh works on your project following the steps below.
Revisions may occur after the delivery date.
Client purchases the project and sends requirements.
Client reviews and approves your work, and you get paid.