Applications software developer Jobs in Naperville, IL

.NET Developer

Location: Lisle, IL
Experience Level: Entry-Level to Early Career (1 3 Years)

Job Summary

STAFFXPERT LLC is seeking a .NET Developer on behalf of our client in Lisle, IL to support its Dealer Management Systems Integration team. This opportunity is ideal for an early-career developer with hands-on experience in application development, REST APIs, and system integration who is eager to grow technical expertise in a collaborative Agile environment.

The selected candidate will work closely with senior developers, product owners, and cross-functional teams to develop and enhance web applications, support system integrations, troubleshoot issues, and contribute to software modernization initiatives throughout the software development lifecycle.

Key Responsibilities

• Develop, maintain, and enhance web applications using C#, ASP.NET, .NET Core, and object-oriented programming principles.
• Create, consume, test, and support RESTful Web APIs and application integrations.
• Assist with integrating internal and external systems, including data mapping, request/response handling, error management, logging, and connectivity troubleshooting.
• Support front-end development using JavaScript, ReactJS, HTML, CSS, jQuery, JSON, and XML.
• Write basic SQL queries and assist with relational database operations and data-related troubleshooting.
• Perform unit testing, API testing, debugging, code validation, and defect resolution.
• Contribute to feature development, code refactoring, application maintenance, and modernization efforts.
• Follow coding standards and software design principles, including SOLID, clean code, and reusable component development.
• Use Git for version control, including branching, pull requests, and code reviews.
• Participate in Agile ceremonies, sprint planning, daily stand-ups, backlog refinement, and retrospectives.
• Collaborate with developers, product owners, QA teams, and business stakeholders to deliver reliable software solutions.
• Support documentation, deployment processes, and continuous improvement initiatives while learning emerging technologies and best practices.

Required Qualifications

• Approximately 1 3 years of relevant experience through professional employment, internships, co-op programs, academic projects, or equivalent software development experience.
• Foundational knowledge of C#, ASP.NET, .NET Core, and object-oriented programming concepts.
• Basic experience developing, consuming, or testing Web APIs and working with RESTful services.
• Familiarity with front-end technologies, including JavaScript, HTML, CSS, JSON, XML, and jQuery.
• Basic SQL knowledge, including writing simple queries and understanding relational database concepts.
• Understanding of debugging, unit testing, API testing, and software quality practices.
• Familiarity with Git, version control workflows, and collaborative development practices.
• Basic understanding of API authentication, application security, error handling, and maintainable software design.
• Strong problem-solving, communication, and analytical skills.
• Ability to work independently on assigned tasks while collaborating effectively within a team.
• Curiosity, accountability, and a willingness to learn new technologies and development practices.
• Bachelor's degree in Computer Science, Software Engineering, Information Systems, or a related technical field.

Preferred Qualifications

• Exposure to ReactJS or other modern front-end frameworks.
• Familiarity with SOAP services and enterprise system integration patterns.
• Experience with Agile development tools such as Azure DevOps (ADO) or JIRA.
• Awareness of Microsoft Azure, Kubernetes, containerization, CI/CD pipelines, and deployment practices.
• Understanding of software design principles, including SOLID, clean code, and reusable components.
• Experience with academic, personal, internship, or open-source software development projects.
• Interest in application modernization, cloud technologies, and continuous improvement.

What Makes This Opportunity Exciting?

• Collaborate with experienced developers and cross-functional teams.
• Gain hands-on exposure to enterprise application development and system integration.
• Strengthen skills in .NET, API development, databases, and modern development practices.
• Contribute to meaningful enhancements and modernization initiatives in an Agile environment.
• Build a strong technical foundation with opportunities for continuous learning and professional growth.