Senior Software Engineer (.NET/C#/Azure)

Ontrac Solutions Inc; United States; Remote; USD 90,000 - 100,000; Full time

Job summary

OnTrac is hiring a Senior Software Engineer to build a modern auction backend in .NET Core/C# on Azure. You will work remotely from the United States, collaborate across multiple teams, and own core features from design through deployment.

Ideal candidates bring 7+ years in C#, strong OOP, React experience, and a passion for scalable, maintainable software in an agile environment.

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or a related field.
• 7+ years of experience in C# development with strong OOP fundamentals.
• Extensive experience with .NET Core and C#.
• Proficiency in React and modern frontend tech.
• Experience with Azure, Azure DevOps, and CI/CD pipelines.
• Experience designing RESTful APIs and relational/noSQL databases.
• Strong problem-solving and collaboration abilities.

Responsibilities

• Implement core features for the new platform across inventory, transactions, and customers.
• Collaborate with multiple teams and product managers to translate requirements into solutions.
• Develop maintainable, efficient C# code in an agile environment.
• Design data models and database interactions for high performance.
• Integrate new system with legacy platforms and third-party services.
• Participate in code reviews and provide constructive feedback.
• Troubleshoot issues, optimize performance, and contribute to docs.

Skills

C# development

NET Core

Azure

React

REST APIs

Azure DevOps

SQL & NoSQL

Data modeling

OO principles

Unit testing

Education

Bachelor's degree in CS/SE

Tools

Entity Framework

Kafka

RabbitMQ

GraphQL

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

Salary: $90 – $100 / year