Upwork home
Sign up
Project Catalog
DesignDesign
Video & AudioVideo & Audio
Development & ITDevelopment & IT
MarketingMarketing
Writing & TranslationWriting & Translation
MoreMore

You will get Nextjs and Reactjs Web Development Expert, Backend Software Engineer

Sandeep K.Status: Offline
Sandeep K. Sandeep K.
5.0
Top Rated
Preview image

Let a pro handle the details

Buy Custom Website Programming services from Sandeep, priced and ready to go.
Sandeep K.Status: Offline
Sandeep K. Sandeep K.
5.0
Top Rated
Preview image

Let a pro handle the details

Buy Custom Website Programming services from Sandeep, priced and ready to go.

Project details

I'm 𝐒𝐚𝐧𝐝𝐞𝐞𝐩, a Senior Full-Stack Developer with 12+ years of experience in React, Python, and Node.js. I build scalable, high-performance apps, optimize user experience, and deliver secure, reliable solutions.

𝐌𝐲 𝐒𝐤𝐢𝐥𝐥𝐬 & 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞:

_Python Full Stack Developer
_Senior Full Stack Developer
_Front-end Development Specialist
_Website Development Guru
_Desktop Application Developer
_Professional Full Stack Software Engineer
_Professional React Developer
_Web API Specialist
_Web Development Guru
_Professional Front-end Engineer
_Front End Developer & Designer
_Custom Website Development Specialist
_Experienced Python Developer
_Python Developer & Web Scraping Expert
_Senior Node.js Developer
_React Development Specialist
_Professional MERN Stack Developer
_ReactJS & Next.js Web Development Expert
_Senior Full Stack React Developer
_React Native & Node.js Developer
_Expert Next.js Developer
_Expert Python Programmer
_Machine Learning Python Expert
_Node.js Backend Developer
_Backend Software Engineer
_Senior Node.js Backend Developer


I deliver innovative, scalable solutions that drive results. Let’s bring your vision to life—contact now to get started!
Programming Languages
HTML & CSS, Python, TypeScript
Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, Design
What's included
Service Tiers Starter
$100
Standard
$300
Advanced
$600
Delivery Time 2 days 4 days 7 days
Number of Revisions
123
Design Customization
-
-
-
Content Upload
-
-
-
Responsive Design
-
-
-
Source Code
-
-
-

Frequently asked questions

5.0
10 reviews
100% Complete
(10)
1% Complete
(0)
1% Complete
(0)
1% Complete
(0)
1% Complete
(0)

SS

Saurav S.
5.00
Oct 14, 2024
Remote Python Developer: Lead AI Project on ServiceNow Automation Great experience working with Sandeep. He is very knowledgeable and pays great attention to detail.

HN

Harinder N.
5.00
Aug 21, 2024
Build Amazon Seller Central integration to MySQL database Outstanding job by Sandeep Kumar on the Amazon SEller Central to MySql integration project! His expertise and attention to detail ensured a seamless and reliable solution. Effective communication and proactive problem solving made the process smooth. Highly recommend fro integration projects.!

SS

Saurav S.
5.00
Apr 29, 2024
Remote Python Developer: Lead AI Project on ServiceNow Automation Great experience working with Sandeep. He is very organised and meticulous.

MI

Mohammad I.
5.00
Mar 3, 2024
Development work using Node, Python and OpenAI's ChatGPT API Sandeep skillfully integrated OpenAI's ChatGPT API into our ERP software using Node.js and Python, showing strong API integration abilities. They managed HTTP requests well, ensuring accurate responses using their knowledge base. Sandeep's expertise in AI, particularly with OpenAI's GPT-3.5, streamlined the process, aided by their knowledge of Travel ERP. Overall, Sandeep's proactive problem-solving and teamwork were crucial to our project's success.

MG

Michael G.
5.00
Feb 8, 2024
Nodejs assignment
Sandeep K.Status: Offline

About Sandeep

Sandeep K.Status: Offline
.NET Developer | Full Stack Developer | React/Angular/Vue | C# | Azure
100% Job Success
5.0  (10 reviews)
Delhi, India - 10:26 pm local time
I am a Full Stack Developer and .NET Developer with 14+ years of experience architecting enterprise-scale systems, building scalable web applications, high-performance REST APIs, microservices architectures, and AI-powered automation solutions using C#, ASP.NET Core, .NET Core 6/7/8, Entity Framework Core, React, TypeScript, Azure, and AWS. Proven track record of reducing infrastructure costs by 25-30% while improving performance by 60-75%.

Key Achievements: As a .NET Developer, I delivered 75% faster REST APIs (2000ms to 500ms) using .NET Core optimizations. Processed 100K+ daily API requests and 10M+ daily events with 99.9% uptime. Achieved 99.9–99.99% uptime on Azure/AWS, reducing costs by 25-30%.

PROJECT EXPERIENCE

Tours and Activities API – Full Stack Developer / Backend Developer / .NET Developer / API Developer
Tech: .NET Core 7, ASP.NET Core Web API, C#, Entity Framework Core, SQL Server, Redis, React, TypeScript, Azure Service Bus, Azure Durable Functions, Microservices, Event-Driven Architecture, AWS, Azure, Workflow Orchestration
Built enterprise booking API serving 100,000+ daily requests with 99.9% uptime using .NET Core microservices architecture. Implemented event-driven architecture with Azure Service Bus and Azure Durable Functions for workflow orchestration. Achieved 75% API response time improvement (2000ms to 500ms). Developed React frontend with TypeScript.

RebookingAtLowerCostEngine – Full Stack Developer / Backend Developer / .NET Developer / API Developer
Tech: .NET Core 8, ASP.NET Core Web API, C#, Entity Framework Core, MongoDB, Redis, React, TypeScript, Azure Batch, Azure Durable Functions, Microservices, Event-Driven Architecture, AWS, Azure, Workflow Orchestration
Developed AI-powered cost-optimization engine processing 10,000+ hotel reservations daily, achieving 15-30% cost savings through automated rebooking. Built scalable .NET Core microservices architecture with event-driven design using Azure Service Bus and Azure Durable Functions for workflow orchestration. Integrated OpenAI GPT-4 and Python ML APIs for intelligent rebooking recommendations.

E-commerce Integration Platform – Full Stack Developer / Backend Developer / .NET Developer / API Developer
Tech: .NET Core 8, ASP.NET Core Web API, C#, Entity Framework Core, SQL Server, Redis, React, TypeScript, Azure Durable Functions, Microservices, Event-Driven Architecture, AWS, Azure, Workflow Orchestration
Developed enterprise E-commerce integration platform processing 10,000+ products and orders daily with 150+ API endpoints using .NET Core microservices architecture. Implemented event-driven architecture with Azure Service Bus and Azure Durable Functions for workflow orchestration. Integrated 20+ marketplace APIs (Amazon SP-API, Shopify, WooCommerce, Magento, eBay, Mirakl).

Logistics Management System – Full Stack Developer / Node Developer / React Developer / API Integration Specialist
Tech: Node.js, Express.js, React 18, TypeScript, MySQL, AWS Lambda, AWS Step Functions, Kafka, SQS, SNS, Microservices, Event-Driven Architecture, AWS, Azure, Workflow Orchestration
Developed enterprise multi-marketplace synchronization platform supporting 100+ clients with real-time sync across 8+ marketplaces using Node.js microservices architecture. Implemented event-driven architecture with Kafka and AWS SQS/SNS. Used AWS Step Functions for workflow orchestration. Built React 18 frontend with TypeScript. Integrated Amazon SP-API, Shopify, WooCommerce, Magento, eBay, Mirakl APIs. Deployed on AWS.

Real Estate Platform – Full Stack Developer / React Developer / Python Developer / TypeScript Developer
Tech: Django, Next.js 15.4, React 19, TypeScript, Python, PostgreSQL, Redis, AWS Lambda, AWS Step Functions, Microservices, Event-Driven Architecture, AWS, Azure, Workflow Orchestration
Built comprehensive multi-tenant real estate marketplace platform with Django backend microservices and Next.js 15.4 frontend with React 19 and TypeScript. Implemented event-driven architecture with AWS SQS and AWS Step Functions for workflow orchestration. Features include multi-role user management, property listings with location hierarchy, Mapbox GL map integration. Implemented PostgreSQL database with Redis caching on AWS.

TECH STACK: C#, .NET Core 6/7/8, ASP.NET Core, ASP.NET Core Web API, Entity Framework Core, LINQ, Microservices Architecture, Clean Architecture, CQRS, Domain-Driven Design, React, TypeScript, JavaScript, SQL Server, PostgreSQL, MongoDB, Redis, Azure Functions, Azure Durable Functions, Azure Service Bus, AWS Lambda, AWS Step Functions, API Gateway, Docker, Kubernetes, GitHub Actions, OAuth2, JWT, SignalR, RabbitMQ, Kafka, REST APIs, gRPC, GraphQL, Amazon SP-API, Shopify API, WooCommerce API

INDUSTRIES: Enterprise Software, SaaS Platforms, E-commerce, Financial Services, FinTech, Travel & Hospitality, Logistics, Real Estate

Steps for completing your project

After purchasing the project, send requirements so Sandeep can start the project.

Delivery time starts when Sandeep receives requirements from you.

Sandeep works on your project following the steps below.

Revisions may occur after the delivery date.

Requirement Gathering

Understand the client’s goals, target audience, and project requirements to define the project scope clearly.

Design & Wireframing

Create wireframes and UI/UX designs to ensure the application meets user expectations and business needs.

Review the work, release payment, and leave feedback to Sandeep.