I will fix your java, nodejs backend bug or API issue fast

K
kerllonleonardo
K
kerllonleonardo
Kerllon
fix your java, nodejs backend bug or API issue fast
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fix your java, nodejs backend bug or API issue fast

About this gig

Are bugs slowing down your application? Let an engineer handle it.

As a backend specialist with a strong engineering foundation, I know how frustrating it is when a server crashes, an API drops data, or a database query times out. I am here to find the root cause and fix it properly.

What I can fix for you:

  • Java & JavaScript (Node.js/Express) syntax and logic errors.
  • REST API integration issues (endpoints not responding, incorrect JSON payloads).
  • Database connection problems and faulty SQL queries.
  • Docker container bugs and backend deployment issues.

Why choose me?

  • Deep Root Cause Analysis: I don't just patch the code; I fix the underlying logic.
  • Fast Delivery: Most basic bugs are solved within 24 hours.
  • Clean Code: All fixes come with clear comments.

Note: I specialize exclusively in BACKEND. I do not fix UI/UX, CSS, HTML, or WordPress issues.

Important: Please send me a message with a description of your bug before placing an order so we can confirm the scope! Let's get your system running smoothly again.

  • Programming language

    • JavaScript

  • Expertise

    • Algorithms & Data structures
    • Performance

  • Frontend framework

    • React.js

  • Backend framework

    • Node.js

Get to know Kerllon

Kerllon

Backend Developer Java, JavaScript

  • FromBrazil
  • Member sinceDec 2022
  • Avg. response time1 hour

  • Languages

    English, Portuguese, Spanish
I build scalable and efficient backend solutions. With a strong foundation in Computer Engineering, I specialize in designing RESTful APIs, optimizing databases, and fixing performance bottlenecks. ​Core Stack: Java & JavaScript (Node.js) ​SQL & Database Optimization ​Docker & Asynchronous Architecture ​I focus on delivering clean, maintainable code and reliable architecture. Whether you need an API built from scratch or a slow system optimized, I am ready to deliver results. Let's solve your backend challenges!

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