Senior Software Engineer - .NET Framework (Monolith / Production Support Focus)

We are seeking a Senior Software Engineer to join our US-based engineering team, supporting a mature, large-scale enterprise SaaS platform in the K-12 nutrition domain.

This is an essential role for an engineer who thrives on the challenge of maintaining and evolving a long-lived monolithic system. Rather than greenfield development, your focus will be on "brownfield" engineering-onboarding into a deep, existing codebase to deliver value through high-level production support, complex debugging, and incremental feature enhancements. You will join a collaborative team where your ability to navigate legacy patterns and multi-layered architectures is the key to success.

What You Will Do

• Production Support & Debugging: Investigate and resolve production issues by navigating complex call stacks across the entire stack (API * BLL * DAL * DB).
• Monolith Maintenance: Read, modify, and extend existing C# code within a .NET Framework 4.x environment.
• Database Engineering: Debug and write complex T-SQL stored procedures and manage business logic often residing at the database layer.
• Feature Development: Implement enhancements and new features within the existing layered architecture.
• Background Processing: Monitor and troubleshoot background jobs using Hangfire.
• Full-Stack Contribution: Work across both the backend and the modern Angular frontend to ensure seamless platform performance.
• Collaboration: Work closely with an embedded team in a staff augmentation model to meet the needs of a mission-critical enterprise application.

• Advanced English is mandatory for this role, as you will be working with a client fully in English
• Expertise in .NET Framework: Extensive hands-on experience with C# and .NET Framework 4.x (specifically ASP.NET Web API and OWIN).Note: This role requires legacy framework expertise; candidates focused solely on .NET Core/5+ will not be a fit.
• Heavy SQL Server Skills: Deep proficiency in SQL Server, including the ability to debug and optimize complex stored procedures and understand database-level business logic.
• Monolithic Architecture Experience: A proven track record of working within large, long-lived enterprise applications and multi-layered (API/BLL/DAL) architectures.
• Modern Frontend Skills: Practical experience with Angular (2+). While you may encounter some legacy AngularJS, you must be proficient in modern Angular versions.
• The "Support Mindset": Strong debugging skills, including log analysis, tracing execution across services, and a comfort level with production-support-heavy workflows.
• Data Access Mastery: Solid experience with Entity Framework 6 (EF6).

Nice If You Have

• Specialized Tech: Experience with Redis, SignalR, WCF, OData, or MSBuild.
• Migration Experience: Exposure to migrating legacy AngularJS components to modern Angular.
• Domain Knowledge: Previous experience working within enterprise SaaS platforms or the K-12 education/nutrition sector.

• Competitive base
• Comprehensive benefits and wellness support
• Flexible work model: hybrid, remote, or in-office
• Real growth opportunities and leadership visibility
• Inclusive, respectful culture that blends U.S. innovation with Colombian heart
• A company that listens, invests in you, and celebrates wins together

Build the Future with AspenView Technology Partners At AspenView, we are passionate about transforming the way organizations approach technology. We specialize in creating high-performing, nearshore IT teams to help North American clients innovate faster and more efficiently. As we continue to grow, we're looking for exceptional people to join our team and help drive impactful change across industries. Why Join AspenView? At AspenView, we're more than a nearshore IT partner-we're a people-first, purpose-driven company that believes great culture drives great outcomes. We're passionate about connecting talent and technology to deliver measurable value for clients-and meaningful career paths for our people.