Browse categories
Explore
Fiverr Pro
English
$
USD
I will build or fix a dot net core 8 9 web API with postgresql mysql sqlserver
Luis Veliz
About this gig
I develop and improve .NET 8 Web APIs with clean, maintainable code. I can fix bugs, add endpoints, integrate thirdparty APIs, connect PostgreSQL/SQL Server, and improve performance. Share your requirements and Ill confirm scope, timeline, and the best approach before we start.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Luis Veliz
Luis Veliz
Full Stack Developer
- FromBolivia
- Member sinceJul 2018
Languages
Spanish, English
Hello! I am a Computer Engineer with more than 5 years of experience as a Full Stack Developer. I work with technologies such as NET, Angular, CodeIgniter, PHP, Laravel, Java, Spring, Node js, React, Vue js and Ionic to create high-quality web and mobile solutions. I also have experience with databases such as MySQL, PostgreSQL, MongoDB and SQL Server, as well as knowledge in cybersecurity. I have developed custom systems, hybrid applications and web platforms, and I have also taught programming courses. I am passionate about technology, continuous learning and offering solutions
FAQ
What do you need to start?
I need a short description of the feature/bug, your expected behavior, and access to the code (GitHub/GitLab link or a ZIP). If you already have Swagger/Postman, share it too.
Can you work with an existing codebase?
Yes. I can join existing projects, understand the architecture, and make safe changes with minimal disruption
Do you build new endpoints and business logic?
Yes. I can add new endpoints, validations, services, and database changes (migrations/scripts) based on your requirements.
Which databases do you support?
PostgreSQL and SQL Server. If you use another DB, tell me and I’ll confirm compatibility before we start.
Can you integrate third‑party APIs?
Yes. I can integrate REST APIs (payments, messaging, government services, etc.) and handle auth, retries, and error cases.
Do you include authentication (JWT)?
Yes, I can implement or fix JWT authentication/authorization if your project requires it.
