Principal Software Engineer

IAA Holdings

Posted 3mo ago

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Lead architecture and define patterns
Mentor engineers
Own the technical strategy and architecture for the Seller Applications portfolio
Lead application modernization initiatives
Partner with Product, Architecture, and peer engineering leaders to define domain boundaries
Define enterprise-grade patterns for data access and persistence
Design for resilience and scale
Embed observability by default using OpenTelemetry
Provide strategic vision for testing practices
Drive the overall future deployment strategy for Seller Applications
Define and validate disaster recovery (DR) and continuity plans
Lead complex, cross-team technical discovery and solution design efforts
Mentor and coach Staff/Senior engineers on technical strategic thinking
Influence decisions beyond the immediate team

12+ years of professional software engineering experience
Significant time modernizing large-scale applications in production environments
Demonstrated experience operating at a Staff/Principal Engineer level
Setting technical direction across multiple teams
Influencing architecture and roadmap decisions
Deep expertise in C#
.NET (modern .NET / .NET Core)
Modern engineering practices (secure-by-default, testing automation, code quality, maintainability)
Strong experience designing APIs and service-oriented or domain-driven architectures
Ability to translate business domains into clear boundaries and contracts
Hands-on experience with cloud platforms (Azure preferred)
Cloud-native patterns (stateless services, externalized config/secrets, horizontal scaling)
Strong understanding of relational databases and modern data-access strategies
Experience with PostgreSQL and schema evolution via migrations
Proven ability to drive reliability and observability practices (OpenTelemetry)
Defining SLOs/SLIs and improving operational outcomes
Excellent communication skills
Ability to influence senior business and technical stakeholders
Clearly explain technical tradeoffs
Proven ability to mentor engineers
Raise overall engineering quality
Build alignment through influence

Experience with high-throughput, transaction-heavy seller or marketplace systems
Exposure to event-driven and asynchronous architectures (e.g., messaging/streaming)
Experience in regulated or compliance-sensitive environments (payments, titles, insurance, privacy)
Familiarity with modern front-end frameworks (React)
Patterns for scalable UI architectures
Experience partnering with SRE/DevOps teams on CI/CD, progressive delivery, and incident management

Skills