Senior .NET Full Stack Developer

Addison Group; Oak Brook (IL); On-site; USD 143,270,000 - 186,252,000; Full time

Benefits offered by this job

Medical benefits

Dental benefits

Vision benefits

Job summary

Addison Group is seeking a Senior .NET / Full Stack Developer in Oak Brook, IL to join an enterprise software team. You will design, develop, and maintain business-critical apps in an Agile environment, providing technical leadership and mentorship to peers.

Responsibilities include building APIs, front-end work with Angular, Azure services, and scalable architecture. Requires strong C#, .NET Core, SQL, and Azure experience with a focus on performance and security.

Qualifications

• Bachelor's degree in Computer Science, MIS, or related technical discipline preferred.
• 5+ years of professional software development experience.
• Experience developing and supporting enterprise-level applications.
• Experience providing technical leadership or mentoring other developers is highly preferred.

Responsibilities

• Design, develop, test, and maintain enterprise applications supporting critical business functions.
• Develop scalable solutions using C#, .NET Core, Angular, SQL, and Azure.
• Participate in Agile ceremonies and collaborate with cross-functional teams.
• Lead technical execution for larger projects, including estimates and timelines.
• Provide technical guidance and code reviews to junior/mid developers.
• Evaluate new technologies to improve architecture and team capabilities.
• Communicate technical concepts effectively to stakeholders.

Skills

C#/.NET Core

Azure

Angular

SQL

Entity Framework Core

Visual Studio

Technical leadership

Education

Bachelor's degree in Computer Science or related

Tools

Azure DevOps

API design

Job description

Senior .NET / Full Stack Developer

Location: Oak Brook Area, IL

Employment Type: 12-Month Contract with Potential for Conversion

Compensation: $50–$65/hour, depending on experience and seniority

Benefits: Medical, Dental, and Vision benefits available through Addison Group

Position Summary

We are seeking an experienced Senior .NET / Full Stack Developer to join an enterprise software development team responsible for designing, developing, and maintaining business-critical applications. This individual will work in an Agile environment and collaborate with developers, architects, QA, project management, and business stakeholders to deliver scalable, secure, and high-performing technology solutions.

The ideal candidate brings strong hands-on development experience across the Microsoft technology stack along with the ability to provide technical leadership, mentor other developers, and contribute to application architecture and technology decisions.

Key Responsibilities

• Design, develop, test, enhance, and maintain enterprise applications that support critical business functions.
• Develop scalable and maintainable solutions using C#, .NET Core, Angular, SQL, and Microsoft Azure.
• Participate in Agile ceremonies including daily stand-ups, sprint/iteration planning, retrospectives, and technical discussions.
• Collaborate with architecture and development teams on application design, technical standards, and platform direction.
• Build and integrate APIs, front-end applications, databases, and cloud-based services.
• Develop and maintain Azure-based solutions utilizing services such as App Services, Functions, Key Vault, Azure SQL, and Azure DevOps.
• Troubleshoot application issues and identify opportunities to improve performance, reliability, security, and scalability.
• Follow established source control, change management, deployment, and software development practices.
• Partner with Quality Assurance, Business Analysts, Project Managers, and other technical teams throughout the software development lifecycle.
• Lead technical execution for larger projects or application modules, including estimates, development timelines, and delivery milestones.
• Provide technical guidance, code reviews, and mentorship to junior and mid-level developers.
• Evaluate new technologies, development tools, and approaches that can improve application architecture and team capabilities.
• Communicate technical concepts effectively to both technical and non-technical stakeholders.

Qualifications

• Bachelor's degree in Computer Science, Management Information Systems, or a related technical discipline preferred.
• 5+ years of professional software development experience.
• Demonstrated experience developing and supporting enterprise-level applications.
• Experience providing technical leadership or mentoring other developers is highly preferred.

Technical Skills

• Strong experience with C# and .NET Core.
• Strong understanding of SOLID principles, domain-driven design, dependency injection, and modern application architecture.
• Experience with Microsoft Azure, including App Services, Functions, Key Vault, Azure SQL, and Azure DevOps pipelines.
• Strong Angular and front-end development experience, including API integrations and UI architecture.
• Advanced SQL skills, including relational database design, query optimization, and enterprise data modeling.
• Experience with Entity Framework Core.
• Strong experience with Microsoft Visual Studio, debugging, application troubleshooting, and performance optimization.
• Experience designing and developing secure, scalable, and high-performing enterprise applications.
• Strong communication, problem-solving, and technical leadership skills.

Additional Details

This is a 12-month contract opportunity with the potential to convert to a permanent position following the initial contract period. Compensation is targeted between $50 and $65 per hour, depending on the candidate's experience and technical seniority.

Contract employees are eligible for Medical, Dental, and Vision benefits through Addison Group.

Addison Group is an Equal Opportunity Employer. Addison Group provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, gender, sexual orientation, national origin, age, disability, genetic information, marital status, amnesty, or status as a covered veteran in accordance with applicable federal, state and local laws. Addison Group complies with applicable state and local laws governing non-discrimination in employment in every location in which the company has facilities. Reasonable accommodation is available for qualified individuals with disabilities, upon request.

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