Job description

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

Requirements

Must-haves

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 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

Nice-to-haves

None flagged.

Application prep

Use the role’s language and application details while tailoring your materials.

Keywords to mirror

azureagilereactci/cdsqlaijavascripttypescriptnext.jsgraphql

Platform: breezy
Effort: medium