Backend Software Engineer

Backend Software Engineer - C#/.NET

Location: Onsite in Dane County, Wisconsin

Type: Contract | Duration: 12+ months

Project Overview

This role supports a portfolio of enterprise application initiatives focused on enhancing backend services, data workflows, and high-volume business systems. The work includes new development, system enhancements, API development, batch processing, and database optimization in an environment where performance, reliability, and accuracy are critical.

Responsibilities

• Design, develop, and maintain backend systems using C#/.NET


• Build and enhance APIs and core business logic supporting financial applications


• Work with batch processing and secure data transfer mechanisms (e.g., SFTP)


• Develop against and optimize relational databases (primarily MySQL)


• Partner directly with business stakeholders to clarify requirements and deliver solutions


• Participate in full lifecycle development, including coding, testing, deployment, and support


• Create and execute unit tests; ensure code quality and system accuracy


• Contribute to deployment and infrastructure activities in a DevOps-oriented environment


• Support scalability, monitoring, and reliability of high-volume data systems

Required Qualifications

• 4+ years of professional experience in backend software development


• Strong hands-on experience with C# and .NET


• Proven experience building APIs and implementing business logic on the backend


• Experience with batch processing and file transfer technologies (SFTP or similar)


• Cloud experience, preferably with AWS


• Solid experience working with relational databases, especially MySQL


• Ability to work effectively in an environment with evolving or undefined requirements


• Strong problem-solving skills and ability to work independently

Preferred Qualifications

• Experience with Terraform or infrastructure-as-code tools


• Exposure to DevOps practices and CI/CD pipelines (Git, Azure DevOps, etc.)


• Background in financial systems or transaction-heavy environments (e.g., payments, ledger systems, audit-heavy systems)


• Experience with systems requiring high accuracy, auditability, and data integrity

Work Environment

• Agile team using Scrum (2-week sprints)


• True DevOps model with shared responsibility across development, testing, and deployment


• Highly collaborative environment with direct interaction between engineering and business teams