I will fix java backend bugs and rest API issues

K
klein_moretti20
K
klein_moretti20
klein
fix java backend bugs and rest API issues
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fix java backend bugs and rest API issues

About this gig

Title: I will fix bugs in your Java, Golang, or Blockchain application

Description:

Are you facing runtime errors, compilation issues, or logic bugs in your software project?

Don't let a single line of bad code stall your entire development process. I am an experienced Full-Stack and Blockchain Developer specializing in debugging and optimizing complex systems. Whether it is a critical server crash or a subtle logic error in your smart contract, I can help you resolve it quickly and efficiently.

My Debugging Services Include:

  • Backend Repair: Fixing concurrency issues, memory leaks, and API failures in Java (Spring Boot) and Golang.
  • Smart Contract Auditing: Identifying and fixing vulnerabilities, gas optimization issues, and logic errors in Solidity contracts.
  • Frontend Troubleshooting: Resolving React/Vue.js integration errors and Web3 connection problems (Metamask/WalletConnect).
  • Database Fixes: Solving query bottlenecks and data consistency errors in SQL/NoSQL databases.
  • Code Refactoring: Cleaning up messy legacy code to improve readability and performance.

Why Choose Me?

  • Fast turnaround time for critical hotfixes.
  • Clean, commented, and maintainable code delivery.
  • 100% satisfactio

  • Programming language

    • Other

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Performance
    • Databases
    • Testing procedures

  • Frontend framework

    • Other

  • Backend framework

    • Other

Get to know klein

klein

Senior Blockchain and Backend Developer, Golang, Java and Smart Contracts Expert

  • FromChina
  • Member sinceJul 2026
  • Avg. response time2 hours

  • Languages

    English
With over 10 years of experience in software dev, I specialize in building secure blockchain solutions and high-performance backend systems. My core expertise lies in Golang and Java, alongside extensive work with Solidity for smart contracts. What I offer: • Blockchain: All blockchain wallets, DApps, and Smart Contract. • Backend: Robust API development and microservices using Golang/Java. • Security: Writing secure, bug-free code for financial applications. I am adaptable to new technologies and dedicated to delivering high-quality results on time. Let's build something great together!

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