Software Engineer; Java – Legacy Systems Modernization Job Hampton New Hampshire USA,Software Development

Position: Software Engineer (Java – Legacy Systems Modernization)

Software Engineer
(Java – Legacy Systems Modernization)

We are now accepting applications for a full-time, remote role in our Engineering Department.

We are seeking a hands‑on Software Engineer with strong Java experience to maintain, troubleshoot, and modernize a large, multi‑module enterprise platform. This role focuses on improving stability, performance, and security across a mature codebase while supporting ongoing feature development. You will work across backend services, web applications, and legacy UI layers, contributing to both day‑to‑day operations and longer‑term modernization efforts.

Key Responsibilities:

Maintain and enhance existing Java‑based web applications and backend services
Troubleshoot and resolve production issues with a focus on performance and reliability
Optimize system performance and improve scalability of legacy components
Develop and maintain features across:
- Spring MVC controllers and RESTful APIs
- Data access layers (MyBatis, Postgre
  
  SQL)
- Legacy UI components (JSP, JSTL, jQuery)
Manage builds and deployments using Ant/Ivy and WAR packaging on Tomcat
Support and enhance application security, including authentication and authorization mechanisms (JWT, 2FA, role‑based access)
Collaborate with cross‑functional teams to identify and implement modernization opportunities
Refactor legacy code to improve maintainability and testability

Required Qualifications:

Strong experience with Java 8
Experience managing Postgre

SQL environments (configuration, optimization, and maintenance) beyond basic schema design
Solid knowledge of:
- Spring MVC and Spring Security
- Servlets, JSP, and JSTL
- RESTful APIs and JSON
Experience working with:
- Ant and Ivy build tools
Proven ability to debug complex issues in legacy systems
Experience supporting production environments

Preferred Qualifications:

Experience with security frameworks and tools (JWT, BCrypt, 2FA)
Familiarity with:
- Web Sockets / STOMP
- LDAP integration
- Messaging frameworks (Active
  
  MQ, Apache Camel)
- jQuery / jQuery UI
- Hibernate
- SOAP / JAX-WS services
Experience with legacy system refactoring and modernization
Knowledge of rules engines such as Drools

Nice-to-Have (Secondary Backend Experience in C/C++):

Experience with C/C++ backend systems, including:
- POSIX threading, signals, and process lifecycle management
- Socket and network programming
- Experience building native applications using Make on Linux
- Integration with XML/SOAP services (e.g., Axis2/C)
- Familiarity with native libraries for OCR/PDF processing
- Performance tuning and memory debugging in long‑running services

What We’re Looking For:

A problem‑solver who thrives in complex, legacy environments
Strong debugging and troubleshooting skills
A pragmatic engineer who can balance maintenance with modernization
Someone comfortable working across the full stack of a traditional Java web application
Health, dental, and vision insurance
Paid time off

About Us:

Gruntworx is a Drake Enterprises, LTD company based out of Franklin, NC with locations in Virginia Beach, VA and Hampton, NH. We are customer‑centric, offering software products and services to professional tax‑preparers. We offer unique opportunities throughout our organizations and our goal is to be the employer of choice and our customers first choice.

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