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Fiverr Pro
English
$
USD
I will build a scalable backend API with nodejs nestjs or asp net
Elton Kaqiu
About this gig
I will build a reliable and scalable backend API for your web application, mobile app, SaaS product or business system.
I specialize in Node.js, NestJS, TypeScript, C# and ASP.NET Core, with PostgreSQL and Microsoft SQL Server.
I can develop:
REST APIs
Authentication and authorization
JWT and role-based access control
Business logic
PostgreSQL / MSSQL databases
CRUD systems
Third-party API integrations
WebSockets and real-time communication
Microservices
Swagger / OpenAPI documentation
Database models and migrations
Docker-based deployment
API debugging and optimization
I can work with an existing codebase or build the backend from scratch.
My focus is clean architecture, maintainable code, reliable API contracts and production-ready implementation.
This Gig is suitable for startups, SaaS products, internal business applications, mobile applications and companies that need additional backend development capacity.
Please contact me before ordering and send your requirements or existing project so I can recommend the correct package.
Get to know Elton Kaqiu
Elton Kaqiu
Software Engineer
- FromKosovo
- Member sinceAug 2026
Languages
English, Albanian
I am a Full-Stack & Backend Software Engineer specializing in C#/.NET Core, MSSQL, and scalable TypeScript/Node.js microservices. I have a proven track record of designing enterprise ERP modules, high-throughput REST APIs, and standalone desktop tools across the full software lifecycle.
My Portfolio
FAQ
Can you work on my existing backend?
Yes. I can refactor existing code, fix bugs, add new REST endpoints, upgrade dependencies, or extend functionality for existing NestJS or ASP.NET Core projects.
Can you use .NET instead of Node.js?
Yes. I work with both ASP.NET Core/.NET and Node.js/NestJS.
Can you connect the API to my frontend?
Yes. I can integrate the backend with React, Next.js, mobile applications or other clients.
Can you deploy the backend?
Yes. Deployment can be included in the Premium package or quoted separately.
What do you need from me to get started?
I need your project requirements or API scope, wireframes/designs (if applicable), and access to your server/repository if working on an existing project.
Do you include API documentation and post-delivery source code?
Yes. Full readable source code is included with every package, and complete Interactive Swagger/OpenAPI documentation is included in the Standard and Premium tiers.
Do you offer database design and microservices?
Yes. I can design normalized relational database schemas, migrations, or deploy microservice architectures depending on your scaling needs.
