Java​/.NET Developer- mostly backend

JOB TITLE:
Java/.NET Developer

LOCATION:

Greenwood Village, CO
INDUSTRY:
Financial

JOB SUMMARY:

Theoris is looking for someone to develop, support and potentially lead technical aspects of a project for this onsite role in Greenwood, Village. The ideal candidate is proficient in Java, Spring/Spring Security/Spring Boot, SQL, as well as being familiar with JavaScript, CSS, and HTML. They will also need to have experience with .NET Development and is responsible for designing, developing, testing, and maintaining applications built on Microsoft’s .NET

framework using languages such as C#, , and F#. This role will start out mainly in Java and they will be responsible for getting other team members up to speed on C# and the .Net framework. The work will eventually transition into more C#, .Net project work as we bridge the gap between our legacy applications and our cloud modernization effort.

REQUIREMENTS:

• 6+ years of back-end development experience in Java and C#/.net core, MVC
• Experience with Spring/Spring Boot/Spring Security
• 5+ years of API development experience (REST)
• 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
• Proficiency with Git and CI/CD
• Excellent debugging and problem solving skills

DESIRED:

• 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

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 Git Hub Actions, Azure Dev Ops, etc.
• Ensure application security using best practices such as authentication, authorization, and OWASP guidelines
• Create documentation and participate in architectural discussions

*** For this position the person may need to get a government clearance, therefore open to US Citizen and Greencard Holders. Only W2/hourly. No C2C.

About Theoris:
Our goal is to Fuel Your Career! As a Theoris team member, you join a culture based on people-centered values and an environment that fosters both personal and professional growth. We build long-term relationships with our clients and our consultants. With over 30 years of building strong relationships in the industry, we’re uniquely positioned to make the right connections. This knowledge is used to find the right job placement.

Our recruiting teams are experts dedicated to the information technology and engineering staffing space and are highly respected by our client base.