Software Engineer

Job Description

Software Engineer @ Calidar

Calidar is a Research Triangle Park (RTP), NC-based medical device startup developing the world’s first X-ray diffraction-based imaging system, a 4D Mammography device. We are building our clinical hardware and the engineering systems that support it. We're looking for a Software Engineer who's excited to own critical work in a fast-moving environment, design systems from scratch, and build software that directly affects clinical outcomes.

You'll be a core contributor on a small, multidisciplinary team where every engineer's work is visible and matters. What you build, ships.

Responsibilities

Develop and maintain firmware for motion control and sensor acquisition.

Implement and tune closed-loop motor control algorithms for precision positioning.

Design and build embedded communication interfaces between microcontroller and motion controller subsystems.

Collaborate with mechanical and electrical engineers to support new PCB assemblies and integrated subsystems.

Write and maintain software requirements, design documentation, and unit and integration test specifications and records consistent with IEC 62304 and QMS requirements.

Build scripts for system calibration, debugging, data logging, and bench testing.

Contribute to software risk management documentation and failure mode analysis.

Support design reviews, code reviews, and V&V planning.

Participate in defining software architecture.

Maintain and improve the development environment: build system, version control practices, and automated test infrastructure.

Qualifications

Experience writing embedded C/C++ for microcontrollers.

Hands-on experience with real-time operating systems.

Experience interfacing with common motion control protocols and hardware.

Solid understanding of motor control fundamentals: stepper motor driving, encoder feedback, closed-loop positioning.

Strong documentation habits: clear inline comments, version-controlled code, and concise technical write-ups.

Ability to independently scope, design, and deliver embedded software features.

Clear communication on progress, risks, and limitations.

4 years of relevant software experience.

Preferred Qualifications

Experience with IEC 62304-compliant software development processes or other regulated-environment software practices.

Familiarity with DICOM file handling.

Prior exposure to X-ray or other imaging system hardware.

Ability to read schematics and PCB layouts.

Experience using COTS components to support software design inputs.

Experience in a startup or small, multidisciplinary engineering team environment.

Why Calidar

Equity stake in a pre-commercial company with a clear path to market.

Meaningful ownership of firmware/software work that ships into clinical settings.

Early-stage impact: you'll shape the systems, processes, and architecture from the beginning.

Mentorship from experienced engineers in a tight-knit team.

An open-room culture and workspace: real-time collaboration, direct feedback, and exposure to all functions of a growing medical device startup.

Logistics

Location: Research Triangle Park (RTP), NC. In-person, on-site.

Type: Full-time employee (FTE), 40 hours per week.

Travel: occasional and infrequent; not a regular part of the role.

Sponsorship: not available for this role.Company Description

At Calidar, we are building next-generation X-ray diffraction imaging to reveal molecular-level signatures of disease. Our patented 4D Mammography technology measures these signatures from the breast noninvasively, providing a new dimension of data with the goal of earlier, more accurate diagnosis of breast cancer.

Full-time