Job Summary
Sr. Software Development Engineer (Onsite)
Locations (Strictly Onsite): * Greenwood Village, CO * Berkeley Heights, NJ * Omaha, NE
Compliance & Work Authorization: * Green Card Holders: Must have been living and working in the United States for at least the last 3 years.
Background Check: Extensive 6-week process required post-offer.
location: Greenwood Village, Colorado
job type: Contract to Perm
salary: $70 - 80 per hour
work hours: 8am to 5pm
education: No Degree Required
Responsibilities
Key Responsibilities
Design, build, and maintain applications using Java, Spring/Spring Boot/Spring Security as well as C#, .NET Framework, .NET Core, or .NET 6/7+
Develop RESTful APIs, microservices, and backend services
Integrate applications with databases using Entity Framework (EF) / EF Core and SQL Server
Collaborate with cross-functional teams using Agile/Scrum methodologies
Write clean, maintainable, and scalable code following industry best practices
Conduct code reviews, troubleshoot issues, and perform performance optimizations
Maintain and enhance CI/CD pipelines using tools such as GitHub Actions, Azure DevOps, etc.
Ensure application security using best practices such as authentication, authorization, and OWASP guidelines
Create documentation and participate in architectural discussions
Qualifications
Required Skills & Qualifications
6+ years of back-end development experience
Strong proficiency in Java as well as C# and the .NET ecosystem
Experience with Spring/Spring Boot/Spring Security
Experience with ASP.NET Core, MVC, and Web API
Working knowledge of SQL Server, Entity Framework, LINQ
Familiarity with Azure (App Services, Functions, Storage, Key Vault)
Knowledge of OOP, SOLID principles, and design patterns
Experience with unit testing (xUnit, MSTest, NUnit)
Strong understanding of REST architecture
Proficiency with Git and CI/CD
Excellent debugging and problem‑solving skills
Preferred Qualifications
Experience with microservices architecture
Knowledge of Docker and containerized deployments
Exposure to Blazor, React, or Angular
Experience with message brokers like Azure Service Bus, RabbitMQ, or Kafka
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 HRsupport@randstadusa.com.
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.
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