Senior Software Engineer (.NET/C#/Azure
Chicago, Cook County, Illinois, 60290, USA
Listed on 2026-10-15
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Software Development
Backend Developer, .NET Developer, Software Engineer, Full Stack Developer
OnTrac is seeking a Senior Software Engineer (.NET / C# / Azure) to join a contractor program supporting a large wholesale digital-marketplace customer. The customer is rebuilding its digital auction platform and decoupling it from a legacy auction management system, standing up a new, independent, modern auction backend purpose-built for a digital-first marketplace. Phase 1 delivers the core platform: inventory management, financial transactions, and customer management.
The initiative is broad in scope and spans four or more teams. This role is ideal for a hands‑on senior engineer who writes production C# on .NET Core, is comfortable on Azure and Azure Dev Ops, and can collaborate across teams to turn business requirements into maintainable, scalable software.
- Expected start: ASAP
- Location:
United States, fully remote
- Implement core features for the new platform, which could include inventory management, financial transactions, and customer management
- Collaborate closely with team members, other teams, and product managers to translate business requirements into technical solutions
- Develop high-quality, maintainable, and efficient C# code within an agile development environment
- Design and implement efficient data models and database interactions
- Integrate the new system with existing platforms and third-party systems
- Conduct code reviews and provide constructive feedback to peers
- Troubleshoot and debug issues, ensuring optimal performance and reliability
- Contribute to technical documentation and best practices
- Bachelor's degree in Computer Science, Software Engineering, or a related field
- 7+ years of experience in C# development, with a strong understanding of object‑oriented programming principles
- Extensive experience with .NET Core and C#
- Familiarity with front-end development using modern frameworks, specifically React
- Experience with the Microsoft Azure cloud platform, including core services and infrastructure
- Experience creating and optimizing CI/CD pipelines, specifically within Azure Dev Ops
- Understanding of software architecture principles and best practices, with proficiency in applying design patterns to solve technical challenges
- Proficiency in designing and developing RESTful APIs
- Solid understanding of database systems and storage (e.g., SQL Server, PostgreSQL, No
SQL) and ORM frameworks (e.g., Entity Framework) - Demonstrated ability to write clean, testable, and efficient code
- Strong problem-solving skills and attention to detail
- Excellent communication and collaboration skills
- Experience with agentic workflows
- Comfortable working with AI and AI‑assisted development tools
- Contemporary JavaScript / Type Script (ES2015+), React Hooks, Next.js, Nx
- Experience with a message queue such as Kafka or RabbitMQ
- Experience writing GraphQL‑interfaced services
- Experience working with authentication and authorization
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