Principal C#/.NET Engineer — Medical Devices (Hybrid)

Connexion Systems and Engineering, Inc.; Wayland (MA); Hybrid; USD 180,000 - 200,000; Full time

Job summary

Connexion Systems & Engineering, Inc. is seeking an experienced Principal Software Engineer to lead the design and development of sophisticated medical device software.

You will drive architecture, mentor teams, and contribute hands-on coding across web, cloud, and API layers using C#/.NET and TypeScript. The role requires strong regulatory knowledge (IEC 62304, ISO 13485, ISO 14971), secure SDLC practices, and a collaborative, cross-functional mindset.

Qualifications

• 8+ years of professional software engineering with architecture/leadership.
• 3+ years in medical device industry with IEC 62304/ISO 13485/ISO 14971 familiarity.
• Strong hands-on C#/.NET development experience.
• Experience building modern web apps with HTML/CSS/JavaScript/TypeScript.
• Knowledge of front-end frameworks, mobile, and backend services.
• Proficient in secure SDLC, risk management, and regulatory compliance.

Responsibilities

• Provide technical leadership for design, development and maintenance of complex software systems.
• Define scalable, secure, reliable, and maintainable architectures; lead reviews.
• Mentor engineers and align teams with engineering best practices.
• Develop modern web apps, backend services, and APIs using C#/.NET and JS/TS.
• Ensure compliance with IEC 62304, ISO 13485, ISO 14971 and Secure SDLC.
• Collaborate with cross-functional teams across software, hardware, product and UX.

Skills

C#/.NET

Frontend web tech

Object-oriented programming

Distributed systems

Cybersecurity principles

Agile development

Mentoring/leadership

Education

Bachelor's degree in Computer Science or related field

Equivalent professional experience

Tools

CI/CD pipelines

Unit testing frameworks

Docker (containerization)

Job description

Connexion Systems & Engineering, Inc. is seeking an experienced Principal Software Engineer to lead the design and development of sophisticated medical device software.

You will drive architecture, mentor teams, and contribute hands-on coding across web, cloud, and API layers using C#/.NET and TypeScript. The role requires strong regulatory knowledge (IEC 62304, ISO 13485, ISO 14971), secure SDLC practices, and a collaborative, cross-functional mindset.