Senior Backend/API Developer

Avion Solutions Inc., an employee-owned company, is seeking candidates for a Senior Backend/API Developer to support the Missile Defense Agency (MDA). This position is located in Huntsville, AL.

Job Responsibilities/Duties:

• Design, develop, and maintain RESTful APIs and backend services using C# and the .NET ecosystem.
• Build and support service-oriented architectures that enable modular, maintainable application design.
• Integrate backend systems with external or internal AI/ML services (API consumption, data exchange, orchestration).
• Collaborate with frontend developers to define API contracts and ensure seamless UI integration
  
  

Support application lifecycle activities, including debugging, performance tuning, and production issue resolution.

• Contribute to architectural decisions, including service boundaries, data flow, and system design patterns.
• Ensure code quality through testing, code reviews, and adherence to development standards.
• Participate in deployment and release processes.
• Document system design, APIs, and key technical decisions for long-term maintainability.
• Other duties as assigned.
  
  

Required Experience:

• 5–10 years of professional software development experience.
• Strong proficiency in C# and the .NET ecosystem (including .NET Framework 4.8 and/or .NET 5 ).
• Proven experience designing and building RESTful APIs and backend services.
  
  

Experience working in production environments with real-world users, data, and operational constraints.

• Solid understanding of software architecture principles (layered architecture, service boundaries, separation of concerns).
• Experience in debugging and maintaining complex systems over time.
• Ability to work independently and take ownership of backend systems.
• Must be a U.S. citizen and have an active DoD Secret Security Clearance.
• Must be able to travel up to 10% of the time.
  
  

Equal Opportunity: Avion Solutions, Inc. reaffirms its belief in equal employment opportunity for all employees and applicants. Avion Solutions, Inc. is an Equal Employment Opportunity Employer and a VEVRAA-governed Federal Contractor that affords equal employment opportunity to protected veterans and people with disabilities. Avion Solutions, Inc. provides all employees and job applicants equal employment opportunities in hiring and promotion without regard to age, sex, sexual orientation, marital status, race, religion, color, veteran status, genetic information, physical or mental disability, national origin, or any other reason prohibited by law.