Senior Software Engineer

Location: Jacksonville, FL | Work Type: Hybrid | Department: Development 

Are you ready to take on your next challenge? Are you ready to take the reins of a capable technical team? Are you ready to contribute to the development of the next generation of products? 

Advantage Design group is looking for an experienced C# Senior software engineer that will be working with and leading a 5+ person team. 

The Role 

As a Senior Software Engineer, you will design, build, and maintain scalable CMS-driven platforms that power ADG’s orientation and recruiting experiences. You will lead the development of enterprise-ready solutions, from end-to-end solutions, while mentoring developers and helping shape best practices. You will be provided with strong mentorship and have a chance to grow and develop your own leadership style. 

About Advantage Design Group® 

We create interactive, video-driven recruiting and orientation platforms that help people start strong. With more than 400 institutions and organizations served, we are the market leader in powering, welcoming, accessible, and data-driven onboarding experiences. We are a 50-person company located in Jacksonville FL that provides online orientation platform to clients across the US and Canada. 

Why You’ll Love It Here 

• Impact on a scale: Your work improves first-day experiences for students and employees nationwide. 

• Tech stack: C#, ASP.NET Core, Umbraco 13 (LTS on .NET 8), Azure, SQL Server, DevOps, CI/CD pipelines. 

• Our Platform: Cloud hosted platform with a web front end, back office, reporting, user management, single sign-on, and systems integrations. 

• Tight-knit development team within a mid-sized company: You’ll enjoy the best of both worlds, collaborating closely with developers while being part of a company where your contributions are visible and valued. 

Key Responsibilities 

• Architect, develop, and maintain Umbraco-based web applications in .NET (C#). 

• Build content models, custom property editors, and support upgrade paths (v13 and higher). 

• Integrate SSO (OAuth2, SAML, OpenID Connect), REST APIs, and enterprise systems with documentation in Open API (Swagger). 

• Configure and manage Azure deployments (App Service, Azure SQL, Storage, Key Vault, App Insights) with CI/CD pipelines. 

• Troubleshoot, debug, and optimize performance across front-end and back-end systems. 

• Champion development standards, peer reviews, automated testing, and observability. 

• Collaborate with project managers, designers, and media teams to deliver responsive and accessible digital experiences. 

• Work with customers to achieve their vision for recruiting and orientation. 

• Lead the vision for product development and improvements. 

Required Skills 

• 5+ years of professional experience in web development with a strong focus on enterprise applications. 

• Expertise in .NET (C#), ASP.NET Core/MVC, Razor, SQL Server, and Git. 

• Hands-on experience with industry standard Content Management Systems (CMS).

• Experience with SOAP, REST APIs, AJAX, Open API (Swagger), and API testing tools such as Postman. 

• Working knowledge of Azure services and application hosting in IIS/Kestrel. 

• Familiarity with authentication protocols (OAuth2, SAML) and SSO patterns. 

• Understanding accessibility standards (WCAG) and security best practices. 

• Familiarity with networking concepts including DNS, SSL, Load Balancing, Firewalls, Security Groups, and DKIM. 

• Experience with microservices architecture  

Experience/Education  

• B.S or equivalent experience  

• 5+ years relevant work experience

• Proficient in design patterns, SOLID principles, and best practices.  

• Knowledge of DevOps practices and continuous integration/continuous deployment (CI/CD). 

Nice to Have 

• Experience with Umbraco Forms, Examine search, headless Content Delivery API 

• Familiarity with Serverless Application Architectures, including Docker or Kubernetes. 

• Experience integrating with Salesforce, Workday, HRIS or Ellucian systems. 

• Azure or AWS certification 

• Leading development projects and mentoring junior team members.  

• Designing, architecting, and implementing complex software solutions.  

• Optimizing application performance and scalability.  

• Lead collaborating with stakeholders, including client meetings to gather requirements and provide technical insights.

Growth Opportunities 

• Actively involved in technological decision-making processes.  

• Lead architectural design and implementation.  

• Pursue further certifications (e.g., Microsoft Certified Solutions Developer - MCSD).  

• IT Certifications (Azure dev associate, .NET fundamentals, DevOps Expert) 

Candidate Profile 

• Technical leader who can take ownership of solutions and guide best practices. 

• Collaborative teammate who thrives in cross-functional environments. 

• Problem solver who balances technical depth with client needs. 

• Continuous learner who explores emerging tools and technologies. 

Compensation and Benefits 

• Competitive base salary with annual performance-based raises. 

• 401(k) with company match. 

• Profit-sharing program. 

• Group Health, Dental, and Vision Insurance. 

• Paid vacation and holidays. 

• Hybrid work schedule after onboarding. 

• Gym membership and stocked breakroom (coffee, snacks, tea). 

• Ongoing training, mentorship, and career development. 

• A beautiful office in coastal Jacksonville, FL near beaches and with no state income tax. 

Ready to Apply? 

• If you thrive on solving complex technical challenges and want your work to make a real impact, we would love to meet you. 

Apply Now at Senior Software Engineer Application
Learn more about what it’s like to join our team by visiting our welcome page: Welcome!.