Net developer • chicago il
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 auctio... Show more
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The average salary range is between $ 102,925 and $ 145,197 year , with the average salary hovering around $ 120,000 year .
The average salary range is between $ 92,626 and $ 136,500 year , with the average salary hovering around $ 107,882 year .
OVERVIEW
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 DevOps, and can collaborate across teams to turn business requirements into maintainable, scalable software.
ENGAGEMENT
• Expected start: ASAP
• Location: United States, fully remote
RESPONSIBILITIES
• 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
REQUIRED QUALIFICATIONS
• 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 DevOps
• 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, NoSQL) 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
USEFUL QUALIFICATIONS
• Contemporary JavaScript / TypeScript (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
