Senior Software Engineer

Senior Software Engineer Location: Houston, Texas (Hybrid, potential for Remote) Role Overview Our organization is seeking a Senior Software Engineer for a newly formed team focused on modernizing complex legacy applications. This role is pivotal in transforming monolithic desktop applications into scalable, API-driven, microservices-based architectures. The ideal candidate will leverage AI-assisted development tools to reverse-engineer, refactor, and rebuild critical business logic while ensuring functional consistency and accuracy. This position requires a strong software engineering foundation, a curiosity for new technologies, and a mindset geared towards experimentation and rapid learning. Key Responsibilities Reverse-engineer and modernize legacy applications, with a focus on C#, .NET, C++, Java, and Fortran codebases. Design, develop, and maintain APIs to expose business and computational logic for modern web-based services. Develop comprehensive characterization and regression tests to validate modernized solutions against legacy functionality. Utilize and guide AI-powered development tools (e.g., Claude Code, Windsurf, Devin agents, AWS Kiro, GitHub Copilot) for code analysis, translation, documentation, and test generation. Contribute to the development of modernization frameworks, engineering standards, and reusable tooling. Extract embedded business logic from legacy UI components and restructure it within a services-oriented architecture. Mentor other engineers on best practices for software modernization and AI-assisted development. Required Qualifications Approximately 10+ years of professional software engineering experience with a broad technical background. Strong proficiency in at least one object-oriented language such as C#, .NET, or Java, with experience in legacy desktop applications being preferred. Demonstrated experience in API development and moving from monolithic to microservices-based architectures. Experience creating automated test strategies to validate behavior-sensitive code changes. Comfort and hands-on experience using AI coding assistants and AI-driven development workflows in a production environment. A strong aptitude for learning and adapting to new languages and tools quickly. Experience with Agile software development methodologies. Preferred Qualifications Experience reading, maintaining, or modernizing applications written in Fortran. Background working with scientific, engineering, numerical, or computational software where output accuracy is critical. Experience deploying applications in cloud and containerized environments such as AWS or Azure. Exposure to modern functional programming concepts. Previous experience in environments with limited documentation and evolving requirements. Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Everforth Apex team member can provide. Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at [email protected] or View phone number on click.appcast.io. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered. UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems. Apex Systems