Senior Full Stack Software Engineer – C#/.NET | Medical Devices

Title: Senior Full Stack Software Engineer – C#/.NET | Medical Devices
Hiring Organization: Connexion Systems & Engineering

Compensation, Benefits, and Employment Type

• Duration: Full-Time, Direct Hire
• Pay rate: $160,000–$180,000+ annually, DOE
• Job Location: Northborough, MA
• Work Model: Hybrid – 3 Days On-site / 2 Days Remote
• Schedule: Monday – Friday, 1^st shift
• Job#: bh19871

Work Authorization & Location Requirements

• Candidates must be currently authorized to work in the United States without employer sponsorship, now or in the future.
• This position is not eligible for visa sponsorship, including employment under CPT or OPT authorization.
• Candidates must be able to work on-site in Northborough, MA, 3 days per week. Travel expenses will not be reimbursed.
• Relocation assistance is not available. Candidates must reside within commuting distance or be willing to relocate at their own expense.

Description:
We are seeking an experienced Senior Full Stack Software Engineer to join a growing software engineering team developing innovative applications and connected technologies for the medical device industry.

This is an opportunity for a hands-on engineer with strong C#/.NET expertise, modern front-end development experience, and a solid understanding of software architecture and design principles.
The ideal candidate enjoys working across the full technology stack, from building responsive user interfaces to developing backend services and APIs that communicate with connected medical devices.
You'll collaborate with software architects, UX/UI designers, product stakeholders, and engineering teams to develop scalable, secure, and reliable applications in a regulated environment.

Key Responsibilities
Full Stack Software Development

• Design, develop, and maintain responsive web applications, backend services, and APIs using C#/.NET, HTML, CSS, JavaScript, and/or TypeScript.
• Develop modern front-end applications using contemporary frameworks, ideally including Blazor.
• Build and integrate APIs and services that support communication with device controllers and connected medical devices.
• Collaborate with UX/UI designers to translate wireframes, prototypes, and technical requirements into accessible, high-quality applications.
• Optimize applications for performance, scalability, reliability, and maintainability.
• Troubleshoot and resolve complex technical issues across front-end, backend, and service layers.

Software Engineering & Architecture

• Apply object-oriented programming principles and established software design patterns, including MVC, MVVM, and Dependency Injection.
• Write clean, maintainable, well-documented code while contributing to engineering standards and best practices.
• Participate in architectural discussions, technical design reviews, and code reviews.
• Mentor junior engineers and collaborate with cross-functional development teams.
• Work within Agile/Scrum environments using Git and modern development workflows.

Medical Device Software & Cybersecurity

• Develop and maintain software supporting regulated medical devices, following applicable standards such as IEC 62304.
• Create and maintain software design documentation, traceability records, and supporting verification and validation artifacts.
• Apply secure software development lifecycle (Secure SDLC) principles, including secure coding, threat modeling, and vulnerability remediation.
• Support automated testing, continuous integration, and software quality initiatives.
• Incorporate cybersecurity best practices, including dependency management, vulnerability scanning, and software supply chain security.

Emerging Technologies & Integration

• Evaluate opportunities to incorporate AI-enabled and agentic capabilities into software applications.
• Support emerging AI technologies, including retrieval-augmented generation (RAG), tool calling, guardrails, and human-in-the-loop workflows.
• Collaborate on integrations involving connected devices, embedded systems, and firmware interfaces.
• Stay current with emerging technologies in web development, cloud computing, application security, and AI.

Required Qualifications

• 5+ years of professional full-stack software development experience, with a focus on front-end applications and backend services.
• Strong hands-on proficiency in C#/.NET development.
• Experience developing modern web applications using HTML, CSS, JavaScript, and/or TypeScript.
• Experience with modern front-end technologies and frameworks; Blazor experience is highly desirable.
• Experience designing, developing, and integrating RESTful APIs, web services, and backend applications.
• Strong understanding of object-oriented programming, software engineering principles, and design patterns, including MVC, MVVM, and Dependency Injection.
• Experience using Git, Agile methodologies, and Scrum development practices.
• Knowledge of software development for regulated medical devices, including IEC 62304, design controls, and requirements traceability.
• Understanding of secure coding practices, cybersecurity principles, and the Secure SDLC.
• Strong debugging, troubleshooting, and problem-solving abilities.
• Excellent communication and collaboration skills, with the ability to work effectively across engineering disciplines.
• Bachelor's degree in Computer Science, Software Engineering, or a related field, or equivalent professional experience.

Additional Experience of Interest

• Blazor and other modern .NET front-end technologies.
• Cloud platforms such as Microsoft Azure, AWS, or Google Cloud.
• Containerization, CI/CD pipelines, and automated testing frameworks.
• Medical device software verification, validation, and regulatory documentation.
• OWASP ASVS, threat modeling, dependency scanning, and software bills of materials (SBOMs).
• Connected device integration, device communication protocols, and firmware interfaces.
• Embedded development using C/C++, RTOS, or hardware-in-the-loop testing.
• AI-enabled application development, including agentic AI, RAG, tool orchestration, evaluation, and AI governance.
• Mobile application development and responsive UI/UX design.

What We're Looking For
The successful candidate will be a strong, hands-on C#/.NET engineer who enjoys building software across the full stack and solving complex technical challenges.

We're particularly interested in engineers who combine modern web application development with backend service integration and an understanding of the quality, documentation, and security requirements associated with medical device software.

This role is ideal for someone who enjoys collaborating with technical teams, contributing to architectural decisions, mentoring other developers, and delivering reliable software that supports real-world medical technologies.

Work Arrangement
This is a hybrid position based in Northborough, MA requiring 3 days on-site and allowing 2 days of remote work each week.

Work Authorization & Location Requirements

• Candidates must be currently authorized to work in the United States without employer sponsorship, now or in the future.
• This position is not eligible for visa sponsorship, including employment under CPT or OPT authorization.
• Candidates must be able to work on-site in Marlborough, MA, 3 days per week.
• Relocation assistance is not available. Candidates must reside within commuting distance or be willing to relocate at their own expense.

Interested?
If you're an experienced Full Stack Software Engineer with strong C#/.NET development skills and an interest in building innovative, secure applications for connected medical devices, we'd love to hear from you.

Apply today to learn more about this opportunity.

Please use the apply button to submit your resume for consideration. You will receive a brief survey via email to complete your application. Applicants who complete the survey will receive priority consideration.

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