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Senior C# .Net Backend Software Engineer

Job in St. Louis, Saint Louis, St. Louis city, Missouri, 63105, USA
Listing for: Zelis Healthcare, LLC
Full Time position
Listed on 2026-01-12
Job specializations:
  • Software Development
    Software Engineer, Full Stack Developer
Salary/Wage Range or Industry Benchmark: 100000 - 125000 USD Yearly USD 100000.00 125000.00 YEAR
Job Description & How to Apply Below
Location: St. Louis

A Little About Us

At Zelis, we Get Stuff Done. So, let's get to it!

A Little About You

You bring a unique blend of personality and professional expertise to your work, inspiring others with your passion and dedication. Your career is a testament to your diverse experiences, community involvement, and the valuable lessons you've learned along the way. You are more than just your resume; you are a reflection of your achievements, the knowledge you've gained, and the personal interests that shape who you are.

Position Overview

The Senior C# .Net Backend Software Engineer will focus on developing information technology-enabled business solutions that are both scalable and reliable. The Senior Software Engineer will perform and execute all phases of the Software Development Lifecycle including Analysis, Design, Development, and Testing while working in a highly collaborative team environment.

Join our team as a Senior C# .Net Backend Software Engineer
, where you'll help lead initiatives for continuous improvement, mentor junior engineers, and drive strategies that enhance overall team performance.

Position is remote but you must be located within 50 miles of a Zelis location.

Locations
  • Boston, MA
  • Morristown, NJ
  • Atlanta, GA
  • St Petersburg, FL
  • Plano, TX
  • St Louis, MO
What You’ll do:
  • Design, develop, and maintain software applications and systems using best practices and industry standards.
  • Write clean, efficient, and well-documented code.
  • Participate in code reviews to ensure code quality and adherence to coding standards.
  • Work closely with product management, quality assurance, and operations teams to understand requirements and deliver high-quality software solutions.
  • Communicate effectively with team members and stakeholders to provide updates on project progress and address any issues or concerns.
  • Participate in team meetings, including daily stand-ups, sprint planning, and retrospectives.
  • Identify and troubleshoot software defects and issues.
  • Perform root cause analysis and implement solutions to resolve problems.
  • Continuously improve software performance, reliability, and scalability.
  • Develop and execute unit tests, integration tests, and automated tests to ensure software quality.
  • Collaborate with the quality assurance team to identify and resolve defects.
  • Ensure that software meets functional and non‑functional requirements.
  • Stay current with industry trends, technologies, and best practices in software engineering.
  • Contribute to the continuous improvement of development processes, tools, and methodologies.
  • Mentor and support junior engineers, providing guidance and sharing knowledge.
What You’ll bring to Zelis:

Required Experience:

  • 5+ years software development experience.
  • Must have C# & .Net development experience.
  • SQL:
    Stored procedures, triggers, indexes, and views.
  • AI - Co-Pilot, ChatGPT, or similar AI platform.
  • Must have experience and understanding of software development principles, design patterns, and best practices.
  • Experience with version control systems (e.g., Git).

Preferred/Helpful

Experience:

  • Backend:
    JavaScript, Java, Python or Spring experience helpful.
  • Front end:
    Blazor, Angular, or React experience helpful.
  • Knowledge of No

    SQL, WCF, Azure/AWS experience a plus.
  • Excellent problem-solving and debugging skills.
  • Knowledge of Agile and Scrum methodologies.
  • Relevant certifications in software development or related fields are a plus (e.g., AWS Certified Developer, Microsoft Certified: Azure Developer Associate).

Please note at this time we are unable to proceed with candidates who require visa sponsorship now or in the future.

Location and Workplace Flexibility

We have offices in Atlanta GA, Boston MA, Morristown NJ, Plano TX, St Louis MO, St Petersburg FL, and Hyderabad, India. We foster a hybrid and remote friendly culture, and all our employee's work locations are based on the needs of the position and determined by the Leadership team. In-office work and activities, if applicable, vary based on the work and team objectives in accordance with Company policies.

Base

Salary Range

$ - $

At Zelis we are committed to providing fair and equitable compensation packages. The base salary range allows us to make an offer that…

Position Requirements
10+ Years work experience
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