Staff Software Engineer

IAA is seeking a highly experienced Staff Engineer to join the US Operations Platform organization. This role is focused on modernizing and scaling mission-critical operational applications that support auction, logistics, titles, payments, and yard operations across the United States.

Responsibilities:

• Lead application modernization initiatives, including migration from legacy .NET Framework to modern .NET (.NET Core / latest LTS)
• Drive architectural design for scalable, modular services and APIs supporting high-volume operational workflows
• Partner with Product and Architecture to decompose monolithic applications into well-defined domains and services
• Define and implement modern data-access patterns using ORMs, repository patterns, and controlled schema migrations
• Improve system performance, resilience, and fault tolerance through sound design practices (timeouts, retries, idempotency, and graceful degradation)
• Establish and enforce engineering standards for code quality, testing, and maintainability
• Embed observability into applications using structured logging, metrics, and distributed tracing (OpenTelemetry)
• Design secure-by-default application patterns including authentication, authorization, secrets management, and secure coding practices
• Lead technical discovery and solution design for complex, cross-team initiatives
• Mentor senior and mid-level engineers through design reviews, code reviews, and hands-on technical guidance
• Collaborate closely with Infrastructure, Security, Data, and Operations teams to ensure solutions meet operational and compliance requirements

Requirements:

• 8+ years of professional software engineering experience, with significant time spent modernizing large-scale applications
• Demonstrated experience operating at a Staff or Principal Engineer level, influencing architecture and technical direction
• Deep expertise in C#, .NET, .NET Core, and modern application development practices
• Strong experience designing RESTful APIs and service-oriented or domain-driven architectures
• Hands-on experience modernizing legacy systems and databases in production environments
• Strong understanding of relational databases and modern data-access strategies
• Experience with cloud platforms (Azure preferred) and cloud-native application patterns
• Excellent communication skills with the ability to clearly explain technical tradeoffs to engineering and business stakeholders
• Proven ability to lead through influence, mentor engineers, and raise overall engineering quality
• Experience with high-throughput, transaction-heavy operational systems
• Exposure to event-driven or asynchronous architectures
• Experience modernizing applications in regulated or compliance-sensitive environments
• Familiarity with front-end modernization (e.g., React) as part of full-stack initiatives