I will fix refactor modernize legacy code for cpp and java systems

M
musman_2003
M
musman_2003
Muhammad Usman
5.0
5.0
fix refactor modernize legacy code for cpp and java systems
fix refactor modernize legacy code for cpp and java systems
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fix refactor modernize legacy code for cpp and java systemsfix refactor modernize legacy code for cpp and java systems

About this gig

FIX & MODERNIZE LEGACY CODE - C++ | C | JAVA


Your code works but it shouldn't be this painful. It's slow, fragile, 

risky to change. Security issues. Performance problems. Hard to maintain.


I specialize in legacy systems that other developers avoid. I modernize 

C++, C, and Java code safelyfixing bugs, improving performance 20-50%, 

hardening security, adding tests.


REAL EXAMPLE: 50k LOC manufacturing system. Was: crashes, slow (3-5s), 

12 security vulnerabilities. Now: 10x faster (400ms), zero crashes, 

vulnerabilities fixed.


WHAT YOU GET:

Code analysis & modernization

Bug fixes & security hardening

Performance optimization (20-50% improvement)

Comprehensive testing

Complete documentation

Before/after metrics



5+ years fixing enterprise legacy systems. 50+ codebases modernized.


Ready to make your code maintainable again?

  • Expertise

    • Algorithms & Data structures
    • Design
    • Databases
    • Source control
    • Testing procedures

  • Programming language

    • Bash
    • C#
    • Go
    • Java
    • JavaScript
    • PowerShell
    • Python
    • Rust
    • HTML & CSS
    • C&C++

  • Frontend framework

    • Angular
    • Bootstrap
    • Next.js
    • React.js
    • Tailwind CSS

  • Backend framework

    • Django
    • Flask
    • Next.js
    • Node.js
    • Spring

Get to know Muhammad Usman

Muhammad Usman

Professional computer programmer

4.9(23)
  • FromPakistan
  • Member sinceMay 2022
  • Avg. response time1 hour
  • Last delivery2 days

  • Languages

    Urdu, Hindi, English
C/C++ software engineer with 5+ years of experience in game development and high-performance applications. I build efficient, scalable software — from custom game engines and gameplay systems to desktop apps and performance-critical tools.

My Portfolio

Reviews

1 reviews for this Gig
5.0

(1)
(0)
(0)
(0)
(0)
Rating Breakdown
  • Seller communication level
    5
  • Quality of delivery
    5
  • Value of delivery
    5
Sort By
Most relevant
  • B

    blushing_boo

    RO

    Romania

    Ongoing collaboration
    5

    Great job as usual

    $200-$400

    Price

    4 days

    Duration

    Helpful?
    Yes
    No
Reviews

1 reviews for this Gig
5.0

(1)
(0)
(0)
(0)
(0)
Rating Breakdown
  • Seller communication level
    5
  • Quality of delivery
    5
  • Value of delivery
    5
Sort By
Most relevant
  • B

    blushing_boo

    RO

    Romania

    Ongoing collaboration
    5

    Great job as usual

    $200-$400

    Price

    4 days

    Duration

    Helpful?
    Yes
    No

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