.Net Developer

Date Posted: 12/05/2025

Hiring Organization:
Rose International

Position Number: 494278

Industry: Biotech

Job Title:

.Net Developer

Job Location:

Chesterfield, MO, USA, 63005

Work Model:
Hybrid

Work Model Details: 3 days onsite and 2 days remote

Employment Type:

Temporary

FT/PT:
Full-Time

Estimated Duration (In months): 13

Min Hourly Rate($): 70.00

Max Hourly Rate($): 80.00

Must Have Skills/Attributes: .Net, REST

Experience Desired: C# .NET development (10 yrs); AWS cloud platform experience (5 yrs);
Node.js development (5 yrs);
Kafka for event streaming (5 yrs)

Required Minimum Education:

Bachelor’s Degree

** C2C is not available**

• Bachelor’s or Master’s degree in Computer Science, related technical field, or equivalent practical experience

• Minimum of 10 years of professional software development experience
• At least 10 years of hands‑on C# .NET development
• 4 or more years working with ASP.NET Core
• 4 or more years of AWS cloud platform experience
• 2 or more years of Node.js development
• Proven track record as a full stack .NET developer for 10+ years
• Demonstrated experience building and deploying large-scale distributed systems

• Expert-level proficiency in .NET middleware development
• Advanced C# .NET development capabilities
• Strong expertise in ASP.NET Core and Entity Framework
• Proficient in dependency injection patterns and principles
• Extensive experience with AWS cloud services and architecture
• Solid understanding of Node.js development
• Proficiency in React or Angular frameworks
• Strong command of front‑end technologies including HTML5, CSS3, and Java Script
• Experience with Kafka for event streaming
• Expertise in AWS Step Functions for workflow orchestration
• Proficient in unit and integration testing using NUnit, XUnit, and MOQ
• Advanced database design skills with PostgreSQL
• Strong understanding of distributed systems and event‑driven architecture
• Excellent problem‑solving and analytical thinking abilities
• Collaborative mindset with ego‑less approach to teamwork

• Analyze, develop, test, and deploy software applications across the full development lifecycle
• Design and implement large‑scale, distributed, event‑driven architecture and applications
• Develop and maintain middleware solutions using .NET technologies
• Build highly scalable REST APIs hosted in cloud environments
• Create and optimize database designs using Postgre
  
  SQL with Entity Framework Core
• Implement front‑end solutions using modern web technologies and frameworks
• Develop serverless functions and integrate AWS services including Lambdas, S3, SQS, SNS, and Step Functions
• Write comprehensive unit and integration tests to ensure code quality and reliability
• Collaborate with autonomous team members to solve complex technical problems
• Challenge existing processes and introduce innovative solutions to improve system performance
• Manage source control workflows using GIT and maintain code repository best practices
• Participate in code reviews and mentor team members on best practices

For information and details on employment benefits offered with this position, please visit here. Should you have any questions/concerns, please contact our HR Department via our secure website.

For information and details on pay equity laws in California, please visit the State of California Department of Industrial Relations’ website here.

Rose International is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, age, sex, sexual orientation, gender (expression or identity), national origin, arrest and conviction records, disability, veteran status or any other characteristic protected by law. Positions located in San Francisco and Los Angeles, California will be administered in accordance with their respective Fair Chance Ordinances.

If you need assistance in completing this application, or during any phase of the application, interview, hiring, or employment process, whether due to a disability or otherwise, please contact our HR Department.

Rose International has an official agreement (), effective June 30, 2008, with the U.S. Department of Homeland Security, U.S. Citizenship and Immigration Services, Employment Verification Program (E-Verify). (Posting required by OCGA 13/10-91.).

• Only those lawfully authorized to work in the designated country associated with the position will be considered.
• Please note that all Position start dates and duration are estimates and may be reduced or lengthened based upon a client’s business needs and requirements.