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

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 Originally posted on Himalayas