Job Description

Our client is seeking a Senior Software Engineer to design, modernize, and support software systems that power payment operations, merchant services, platform integrations, and internal business applications. This role is ideal for a highly skilled engineer who thrives in a complex, mixed-technology environment and can effectively balance legacy system support with modern development practices.

The ideal candidate brings deep expertise across the Microsoft technology stack and is comfortable working with both legacy and modern architectures, contributing to the stability, scalability, and evolution of a large enterprise application portfolio.

Remote role for candidates based in Atlanta.

Key Responsibilities

Software Engineering & System Ownership

• Design, develop, test, deploy, and maintain enterprise-grade payment and business applications
• Work across a diverse codebase, including 40+ VB.NET and 50+ C# projects, ensuring performance, reliability, and maintainability
• Analyze complex systems to understand dependencies, integrations, and data flows
• Own critical applications throughout the full lifecycle, including enhancements, troubleshooting, optimization, and decommissioning
• Write clean, scalable, and maintainable code aligned with engineering best practices

Legacy Modernization & Platform Evolution

• Evaluate legacy .NET Framework applications and define strategic migration paths to .NET 6+ and ASP.NET Core
• Refactor monolithic systems into modular or service-oriented architectures where appropriate
• Reduce technical debt while maintaining system stability in high-availability payment environments
• Improve scalability, observability, and deployment consistency across integrated systems

Collaboration & Technical Leadership

• Act as a senior technical leader in architecture discussions, code reviews, and incident response
• Mentor junior and mid-level engineers on coding standards, debugging, and system design
• Partner with product, QA, compliance, and business teams to deliver practical technical solutions
• Create and maintain technical documentation, including architecture diagrams, runbooks, and deployment processes
• Support production systems through incident management, root cause analysis, and continuous improvement initiatives

Required Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or a related field (or equivalent experience)
• 6+ years of experience developing and maintaining enterprise-level applications
• Strong proficiency in Visual Basic .NET, C#, .NET Framework 4.8, .NET 6+, and ASP.NET Core
• Experience working with both legacy and modern application architectures
• Hands-on experience with GitHub, including branching strategies and code reviews
• Strong database experience with SQL Server, MySQL, PostgreSQL, and DynamoDB
• Familiarity with Athena-based data structures or analytical query environments
• Proven ability to troubleshoot complex production systems across application and data layers
• Experience working in regulated, compliance-driven environments

Preferred Qualifications

• Background in payments, fintech, merchant services, or transaction-processing systems
• Experience modernizing VB.NET applications into C# and ASP.NET Core
• Familiarity with event-driven architectures, APIs, and service integrations
• Experience with observability tools, logging, metrics, and monitoring platforms
• Exposure to CI/CD pipelines and automated release processes within GitHub ecosystems

Technical Environment

• Languages: Visual Basic .NET, C#
• Frameworks: .NET Framework 4.8, .NET 6+, ASP.NET Core
• Source Control: GitHub
• Databases: SQL Server, MySQL, PostgreSQL, DynamoDB, Athena

Core Competencies

• Deep technical expertise across legacy and modern systems
• Pragmatic approach to modernization and system improvement
• Strong operational mindset for production support and reliability
• Clear communication with both technical and non-technical stakeholders
• Ownership mentality with accountability for critical systems
• Passion for mentoring and developing engineering talent

What You’ll Work On

• Reverse-engineering and documenting legacy systems
• Migrating applications to modern .NET platforms
• Enhancing API performance and reliability in payment systems
• Optimizing database queries and improving data access patterns
• Troubleshooting complex environments across cloud and on-prem systems
• Standardizing engineering practices across large repositories
• Collaborating cross-functionally to improve system stability and customer experience

What Success Looks Like
Success in this role means maintaining stability across a complex application landscape while driving meaningful modernization. You will reduce technical risk, enhance system performance, and improve engineering efficiency—all while contributing to a culture of strong technical discipline, collaboration, and continuous improvement.

About SOLTECH
SOLTECH is a leading national technology company based in Atlanta, driven by a steadfast commitment to integrity, strong company values, and customer centricity. For nearly 30 years, we’ve been part of the thriving technology community and have earned honors such as The Atlanta Journal-Constitution’s Top Workplace and the Best & Brightest Companies To Work For In The Nation.

Our exceptional team of engineers, designers, and strategists delivers custom software applications, technology consulting, AI and data engineering solutions, and IT staffing services that help organizations solve complex challenges nationwide.

Join us on our quest to make the world a better place by bringing to life innovative software solutions that make our lives easier, safer, healthier, and more productive.

If you’re an IT professional seeking your next career opportunity, we’d love to match your expertise with a role where you can thrive. Learn more at https://soltech.net/working-for-soltech/.

SOLTECH believes in the dignity of every individual and practices equal employment opportunity as a core principle. We consider all applicants without regard to race, color, age, sex, sexual orientation, gender identity, religion, marital status, national origin, disability, or veteran status.