Backend / API Developer (.NET Focus)

Job Description

Job Description

Job Description:

This role serves as a primary backend engineer responsible for designing, building, and maintaining APIs and service layers that power a suite of web applications. The position emphasizes reliability, maintainability, and scalability of backend systems, with a strong focus on structured data, service architecture, and integration with downstream systems (including AI-enabled features via external services).

This is a hands-on engineering role embedded within a development team, working closely with frontend developers, database specialists, and DevOps personnel to deliver production-grade software in a controlled, enterprise environment.

Core Responsibilities:

• 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

Required Qualifications:

• 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 debugging and maintaining complex systems over time
• Ability to work independently and take ownership of backend systems

Desired Skills:

• Experience integrating with AI/ML services (REST APIs, data pipelines, inference workflows)
• Familiarity with Azure DevOps (build/release pipelines, repos, work items)
• Experience working in controlled or restricted environments (e.g., air-gapped systems, secure networks)
• Familiarity with frontend technologies (JavaScript, MVC frameworks, or similar) for effective collaboration
• Understanding of authentication/authorization patterns (e.g., role-based access, enterprise auth systems)
• Agile / Scrum team experience

ISSAC is a Systems Engineering and Advanced Data Analytics company. We support clients across a wide range of industries, including federal/defense, bioscience/healthcare, and commercial. ISSAC offers competitive salaries, Medical, Dental, Vision and Life Insurance. We also have 4 weeks of PTO, 11 holidays, education assistance, 401K program and profit sharing.

Company Description

ISSAC is a Systems Engineering and Advanced Data Analytics company. We support clients across a wide range of industries, including federal/defense, bioscience/healthcare, and commercial. ISSAC offers competitive salaries, Medical, Dental, Vision and Life Insurance. We also have 4 weeks of PTO, 11 holidays, education assistance, 401K program and profit sharing.