Capstan Medical Software Engineer interview questions & guide 2026

Preparation should focus on your ability to apply fundamental engineering principles to the unique constraints of medical robotics. We value candidates who don't just know the "what" but can deeply explain the "why" behind their technical choices.

System-Level Thinking – We expect you to understand how your code interacts with the Linux kernel and the underlying hardware. Be prepared to discuss memory management, threading, and how you ensure deterministic behavior in real-time systems.

Safety-Critical Mindset – Developing for medical devices means every line of code must be considered for its failure modes. You should be able to articulate how you write testable, verifiable, and secure code that adheres to regulatory-adjacent quality standards.

Technical Communication – You will work alongside mechanical and controls engineers who may not have a software background. Your ability to translate complex software concepts into clear, actionable technical trade-offs is a key indicator of your potential to thrive here.

The interview process at Capstan Medical is designed to be transparent and collaborative, reflecting our work culture. It typically begins with a phone screen with the hiring manager to discuss your background and interest in our mission. If you move forward, you will be invited to an onsite visit.

The onsite experience is professional yet casual, focusing on technical depth rather than "gotcha" brain teasers. You will meet with the manager and other engineers to discuss your approach to system design, debugging, and device evaluation. You should also expect a site tour, which provides a great opportunity to see the hardware you will be helping to control.

The timeline above represents a typical progression from initial screening to technical assessment and final team interviews. Use this to pace your preparation, ensuring you have refreshed your knowledge on OS fundamentals and system architecture before the onsite stage. Note that the process may be adjusted based on the specific seniority of the role, but the focus on "hands-on" technical evaluation remains constant.

Real-Time System Design

We prioritize candidates who understand that in robotics, latency is not just a performance metric—it is a safety requirement. You should be comfortable discussing how to keep system response times predictable.

Be ready to go over:

• Deterministic execution and avoiding priority inversion.
• The use of real-time operating system (RTOS) features or Linux PREEMPT_RT patches.
• Managing communication buffers between high-frequency control loops and lower-frequency system services.

Hardware-Software Integration

Your ability to bridge the gap between abstract code and physical motion is vital. We look for candidates who have successfully debugged systems where the "bug" might be in the sensor, the actuator, or the software logic.

Be ready to go over:

• Strategies for handling sensor noise and data validation.
• How to implement "fail-safe" states when communication with hardware is interrupted.
• Experience with low-level drivers or hardware abstraction layers.

As a Software Engineer at Capstan Medical, you will own the software lifecycle for parts of our robotic platform. You will design and implement the logic that translates surgeon inputs into precise catheter movements. This involves writing performant C++ or Rust code that interfaces directly with real-time controls, as well as developing the system services that ensure the platform remains stable and safe during operation.

Collaboration is at the heart of your day-to-day. You will work with controls engineers to tune motion parameters, GUI developers to ensure the surgeon has the necessary feedback, and systems engineers to ensure the entire platform meets rigorous safety standards. You will also participate in design reviews and contribute to the documentation required for medical device validation, ensuring that our software is as reliable as the surgeons who depend on it.

We look for engineers who possess a strong grasp of fundamentals and the flexibility to pick up new tools as the problem requires.

Must-have skills:

• Proficiency in C++ and Python; experience with Rust is a significant advantage.
• Deep understanding of Linux, including process management, IPC, and kernel-level concepts.
• 5+ years of professional experience in designing and shipping complex software systems.
• Demonstrated ability to debug issues that span multiple system layers.

Nice-to-have skills:

• Experience with ROS/ROS2 or other robotics middleware.
• Background in medical device development or other safety-critical domains.
• Familiarity with distributed systems and system hardening (security).

Q: How much technical preparation should I prioritize compared to behavioral prep? A: Prioritize technical depth. While we value culture fit, the core of our interviews is based on your ability to solve engineering problems. Spend 70% of your time on system design and OS fundamentals.

Q: Is the interview process mostly whiteboard coding or system discussion? A: We lean heavily toward system discussion and architectural evaluation. We want to see how you think about problems, not just how you write syntax on a board.

Q: Does Capstan Medical offer remote work? A: This is a hybrid role. You will be expected to be onsite in Santa Cruz 3 days a week. This is essential for the hands-on nature of our robotics work.

Q: What is the typical timeline from the first screen to an offer? A: It generally takes 3–5 weeks. We aim to move quickly, but we are thorough in our evaluation to ensure a long-term match.

• Own your answers: When discussing a past project, be prepared to explain exactly what your role was and why you made specific trade-offs. We look for "end-to-end" ownership.
• Show your work: If you are asked to solve a problem on a whiteboard or paper, explain your thought process clearly. We are interested in your logic, not just the final result.
• Know the mission: Understand the specific challenges of transcatheter valve deployment. Being able to speak to the "why" of our technology shows genuine passion and preparation.

The Software Engineer role at Capstan Medical is a unique opportunity to build technology that saves lives while enjoying the incredible environment of Santa Cruz. By focusing your preparation on system-level architecture, real-time constraints, and the ability to articulate complex technical trade-offs, you will be well-positioned to succeed.

We encourage you to review your past projects through the lens of reliability and safety. If you are prepared to discuss the details of your technical decisions and demonstrate a collaborative, problem-solving mindset, you will find our interview process both challenging and rewarding. We look forward to seeing the impact you can make on our team.

The salary data provided reflects the broad range for engineering roles at Capstan Medical. Interpret this as an indicator of the company's commitment to attracting high-level talent, and focus your preparation on demonstrating the depth of experience that justifies a senior-level contribution.