Senior .NET Software Developer; C# ​/ASP.NET

Position Summary

We are seeking a Senior .NET Software Developer to support the design, development, and maintenance of secure, public-facing web applications and enterprise systems. This role requires deep expertise in C#, ASP.NET (.NET 8+), SQL, and modern front-end technologies. The ideal candidate brings strong experience developing secure web applications, writing clean and scalable code, and producing thorough technical documentation.

This is a long-term, onsite opportunity in Austin, TX, supporting high-visibility regulatory systems. Candidates must be comfortable working in a structured development environment and contributing to full SDLC efforts from analysis through implementation

Job Responsibilities

• Design, develop, test, and implement secure public-facing web applications using C# and ASP.NET (.NET 8+)
• Develop and maintain enterprise-level .NET applications supporting regulatory and operational systems
• Write efficient, optimized SQL and/or PL-SQL queries and support backend database development
• Build responsive front-end components using HTML, CSS, and Java Script
• Plan, analyze, and coordinate development activities across multiple programming projects
• Maintain and enhance secure web applications with a strong focus on performance and data protection
• Develop and maintain comprehensive system and technical documentation
• Participate in code reviews and manage source control using established version control practices
• Support system integrations and data exchanges between enterprise applications
• Provide technical guidance and troubleshooting support across cross-functional teams
• Collaborate within structured SDLC or Agile development environments
• Ensure applications meet security, compliance, and performance standards

Qualifications

- 8+ years of hands-on experience with C# and ASP.NET development

- Minimum 2+ years working with .NET 8.0 or higher

- 8+ years developing and maintaining secure public-facing .NET web applications

- 8+ years of experience with SQL or PL/SQL

- Strong proficiency in HTML, CSS, and Java Script

- Experience with source control and version control systems

- Experience developing technical and system documentation

- Strong understanding of secure coding practices and web application security

- Experience working through full SDLC (analysis, design, development, testing, deployment)

- Ability to work onsite in Austin, TX

Equal Opportunity

Employer:

Race, Color, Religion, Sex, Sexual Orientation, Gender Identity, National Origin, Age, Genetic Information, Disability, Protected Veteran Status, or any other legally protected group status.

At Randstad Digital, we welcome people of all abilities and want to ensure that our hiring and interview process meets the needs of all applicants. If you require a reasonable accommodation to make your application or interview experience a great one, please contact

Pay offered to a successful candidate will be based on several factors including the candidate's education, work experience, work location, specific job duties, certifications, etc. In addition, Randstad Digital offers a comprehensive benefits package, including: medical, prescription, dental, vision, AD&D, and life insurance offerings, short-term disability, and a 401K plan (all benefits are based on eligibility).

This posting is open for thirty (30) days.