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English
$
USD
I will modernize, upgrade or migrate your existing web application
Victor Herrera
About this gig
Is your web application outdated, difficult to maintain, or built with legacy technologies?
I can modernize your existing application without unnecessary full rewrites, improving performance, maintainability, architecture, and user experience through a practical, incremental approach.
I can help with:
- Legacy web application modernization
- Code refactoring and cleanup
- Frontend migration to React
- jQuery, JavaScript & Bootstrap modernization
- Java modernization with Spring Boot
- JSP/Struts migration
- REST API development and improvement
- Hibernate/JPA & PostgreSQL integration
- Dockerization
- Incremental modernization
Technologies:
Java, Spring Boot, Hibernate/JPA, JSP, Struts, React, JavaScript, jQuery, Bootstrap, PostgreSQL, REST APIs, Docker.
Not sure what you need?
Just tell me about your application, its current issues, and what you want to improve. I'll analyze your needs and recommend the right modernization strategy.
I prioritize maintainable, incremental improvements over unnecessary rewrites.
Please contact me before ordering so I can evaluate your application and recommend the right scope and package.
Get to know Victor Herrera
Victor Herrera
Software Engineer
- FromPortugal
- Member sinceAug 2026
Languages
Spanish, English
Full-Stack & Mobile Developer with 10+ years of experience building, maintaining, and modernizing real-world software. I help businesses turn ideas into reliable apps and upgrade legacy systems through refactoring, migration, and modernization. Experience across web, mobile, backend, APIs, databases, and enterprise systems using Java, Spring Boot, React, React Native, PHP, .NET, PostgreSQL, JavaScript, etc. I focus on clean, maintainable solutions tailored to business needs.
My Portfolio
Other Software Development Services I Offer
FAQ
Do I need to know which technologies my application uses?
No. If you're not sure about your application's technology stack, send me information about the application and what you would like to improve. I can help identify the existing technologies and recommend an appropriate approach.
Do you only work with Java applications?
No. I work with both frontend and backend web technologies, including Java, Spring Boot, React, JavaScript, jQuery, Bootstrap, JSP, Struts, Hibernate/JPA and PostgreSQL.
Can you modernize only part of my application?
Yes. In many cases, incremental modernization is safer and more cost-effective than rewriting an entire application. We can modernize individual components, features or modules progressively.
Can you migrate my entire legacy application?
Yes, depending on the size and complexity of the project. Complete migrations require an initial review so I can define the scope, architecture, timeline and cost. Contact me before ordering for larger projects.
Can you migrate jQuery or JSP to React?
Yes. I can migrate suitable frontend functionality from jQuery, JSP or traditional JavaScript interfaces to React while integrating it with your existing or modernized backend.
Can you migrate legacy Java to Spring Boot?
Yes. Depending on the application's architecture, I can refactor or progressively migrate legacy Java functionality to Spring Boot and REST-based services.
Do you recommend rewriting the entire application?
Not necessarily. A complete rewrite can introduce unnecessary cost and risk. I first evaluate whether incremental modernization, refactoring or targeted migration can achieve the desired result.
