Senior Full-Stack Engineer - C#, Med Device AI

Connexion Systems + Engineering

Marlborough (MA)

On-site

USD 160,000 - 180,000

Full time

5 days ago

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Job summary

Connexion Systems & Engineering Inc. seeks a Senior Full Stack Software Engineer in Marlborough, MA to design and implement scalable web and mobile applications. You will work with C#/.NET, modern front-end tech including Blazor, and collaborate with architects to realize product visions.

You will mentor engineers, lead code reviews, and help enforce secure-by-design practices, while integrating APIs to device controllers and ensuring CI/CD and robust testing in regulated medical-device contexts.

Qualifications

Bachelor's degree in Computer Science, Software Engineering or a related field, or equivalent experience.
5+ years of experience in development, full-stack with a focus on front-end and service development.
Web and mobile application development, with modern front-end technologies and frameworks ideally including Blazor.
Experience developing solutions using C#/.NET and HTML/CSS/JS or TypeScript.
Experience in web service and API development, including service-to-device communication and API design.
Extensive knowledge of object-oriented programming and software engineering patterns such as MVC, MVVM and Dependency Injection.
Knowledge of version control systems (Git) and Agile methodologies, with experience working in a Scrum environment.
Working knowledge of medical device software development and standards, including IEC 62304 with experience authoring design control and traceability documentation.
Understanding of agentic AI development practices, including retrieval, tool use, guardrails, evaluation and the risks of non-deterministic behavior in regulated products.
Excellent problem-solving skills and a proactive attitude in tackling development challenges.
Strong verbal and written communication skills, with the ability to collaborate effectively in a team environment and mentor others.
Experience with cloud platforms such as Azure, AWS or Google Cloud, containerization and CI/CD pipelines
Solid understanding of cybersecurity principles and the Secure SDLC, including OWASP ASVS, threat modeling, dependency and secret scanning, and software bills of materials.
Experience with embedded or device integration, including firmware interfaces, device communication protocols and hardware-in-the-loop testing.
Exposure to embedded or firmware development (C/C++, RTOS, device communication protocols) and hardware-in-the-loop testing.

Responsibilities

Design and develop responsive, user-friendly applications and services using modern front-end and server-side technologies.
Collaborate with UX/UI designers to translate designs and prototypes into high-quality, accessible code.
Implement APIs and services to support communication to device controllers and connected medical devices.
Optimize applications for maximum speed, scalability and reliability.
Troubleshoot and debug complex applications across the full stack.
Write clean, efficient and well-documented code, and help develop strong coding standards and best practices.
Lead code reviews and mentor less experienced engineers.
Ensure the technical feasibility of UI/UX designs.
Apply secure-by-design and secure coding practices, including threat modeling, vulnerability remediation and software supply chain integrity.
Integrate automated tests into CI/CD pipelines and support verification and validation activities for regulated medical device software.
Evaluate and integrate agentic AI capabilities, including tool calling, retrieval-augmented generation, guardrails and human-in-the-loop review, supported by appropriate evaluation and observability.
Provide supporting design documentation and traceability artifacts.
Stay up to date with emerging trends in web, application and AI development.