Dexcom Software Engineer Interview Questions + Guide in 2025

Dexcom Corporation is a pioneering global leader in continuous glucose monitoring (CGM), dedicated to transforming diabetes management and improving health outcomes.

As a Software Engineer at Dexcom, you will play a crucial role in developing cloud-based software systems, specifically APIs and web applications, that enhance the user experience and streamline operations for patients and healthcare providers. You will work within a multi-disciplinary Agile team, collaborating closely with stakeholders to understand business processes and requirements. Your key responsibilities will include designing and developing FHIR APIs, building responsive frontend and backend applications using modern frameworks, and ensuring the application architecture supports Dexcom’s mission of providing actionable health insights. A strong background in both software development and cloud environments, as well as proficiency in programming languages such as Java, Kotlin, or JavaScript, will be essential for success in this role. Additionally, familiarity with containerization tools like Docker, testing methodologies, and experience in a cloud environment such as AWS or GCP will set you apart.

This guide will help you prepare for your interview by providing insights into the role's expectations, the company culture, and the skills necessary to excel at Dexcom.

The interview process for a Software Engineer at Dexcom is structured to assess both technical skills and cultural fit within the organization. It typically consists of several stages, each designed to evaluate different aspects of a candidate's qualifications and compatibility with the team.

1. Initial Screening

The process begins with an initial screening, which is usually a 30-minute phone call with a recruiter. During this conversation, the recruiter will discuss the role, the company culture, and your background. This is an opportunity for you to express your interest in the position and to clarify any questions you may have about the job or the company.

2. Technical Interview

Following the initial screening, candidates typically participate in a technical interview, which may be conducted via video conferencing. This interview focuses on your technical skills and experience, particularly in areas relevant to the role, such as software development, cloud technologies, and programming languages. Expect to discuss your past projects and may include problem-solving scenarios or coding challenges to demonstrate your technical proficiency.

3. Hiring Manager Interview

After the technical interview, candidates often have a one-on-one conversation with the hiring manager. This interview is more focused on your fit within the team and the specific projects you would be working on. The hiring manager will likely ask about your experience with Agile methodologies, your approach to teamwork, and how you handle challenges in a software development environment.

4. Panel Interview

The final stage of the interview process usually involves a panel interview, which may consist of multiple team members, including engineers and possibly other stakeholders. This round is designed to assess your collaborative skills and how well you can communicate technical concepts to a diverse audience. Expect a mix of technical questions, behavioral questions, and discussions about your approach to software engineering challenges.

Throughout the process, candidates are encouraged to ask questions to better understand the team dynamics and the projects they would be involved in.

Now, let's delve into the specific interview questions that candidates have encountered during their interviews at Dexcom.

Here are some tips to help you excel in your interview.

Understand the Company Culture

Dexcom values integrity, dependability, and a commitment to improving human health. Familiarize yourself with their mission to change diabetes management and their broader vision for consumer health technology. During the interview, express your alignment with these values and demonstrate how your personal and professional experiences resonate with their mission. This will show that you are not just looking for a job, but are genuinely interested in contributing to their goals.

Prepare for Behavioral Questions

Expect a mix of technical and behavioral questions. Be ready to discuss your past experiences, particularly those that highlight your problem-solving skills and ability to work in a team. Use the STAR (Situation, Task, Action, Result) method to structure your responses. For instance, if asked about a challenging project, describe the situation, your specific role, the actions you took, and the outcome. This approach will help you convey your experiences clearly and effectively.

Brush Up on Technical Skills

Given the technical nature of the Software Engineer role, ensure you are well-versed in relevant programming languages and frameworks such as Java, Kotlin, and Angular. Review concepts related to cloud environments (AWS, Azure, GCP) and familiarize yourself with API development, especially FHIR APIs, as this is a key responsibility. Practice coding problems and system design questions to demonstrate your technical proficiency during the interview.

Engage with Your Interviewers

Interviews at Dexcom are described as friendly and conversational. Take this opportunity to engage with your interviewers by asking insightful questions about the team dynamics, ongoing projects, and the technologies they use. This not only shows your interest in the role but also helps you assess if the team and company culture are a good fit for you.

Be Ready for Team Dynamics

Dexcom emphasizes collaboration and teamwork. Be prepared to discuss how you have successfully worked in cross-functional teams in the past. Highlight your experience in Agile environments and your ability to adapt to changing requirements. This will demonstrate that you can thrive in their collaborative culture.

Follow Up Professionally

After your interview, send a thank-you email to express your appreciation for the opportunity to interview. Mention specific points from the conversation that resonated with you, reinforcing your interest in the role and the company. This not only shows professionalism but also keeps you top of mind as they make their decision.

By following these tips, you will be well-prepared to showcase your skills and fit for the Software Engineer role at Dexcom. Good luck!

In this section, we’ll review the various interview questions that might be asked during a Software Engineer interview at Dexcom. The interview process will likely focus on your technical skills, problem-solving abilities, and experience with software development methodologies, particularly in an Agile environment. Be prepared to discuss your past projects, your approach to coding challenges, and how you work within a team.

Technical Skills

1. Can you explain the process you follow when developing an API?

Understanding the API development process is crucial for this role, as you'll be building APIs for various applications.

How to Answer

Discuss the steps you take from requirements gathering to deployment, emphasizing best practices and any tools you use.

Example

“I start by gathering requirements from stakeholders to understand the functionality needed. Then, I design the API endpoints and data models, followed by implementing the API using a framework like Spring Boot. I ensure to write unit tests and document the API for future reference. Finally, I deploy it to a cloud environment and monitor its performance.”

2. What is your experience with cloud platforms like AWS or Azure?

Cloud experience is essential for this role, as Dexcom operates in a cloud environment.

How to Answer

Share specific projects where you utilized cloud services, focusing on the benefits they provided.

Example

“I have worked extensively with AWS, particularly with services like EC2 for hosting applications and S3 for storage. In my last project, I migrated a monolithic application to a microservices architecture on AWS, which improved scalability and reduced costs significantly.”

3. Describe a challenging bug you encountered in a project and how you resolved it.

Problem-solving skills are vital for a software engineer, and this question assesses your troubleshooting abilities.

How to Answer

Outline the steps you took to identify and fix the bug, emphasizing your analytical skills.

Example

“In one project, we faced a performance issue that caused the application to slow down. I used profiling tools to identify bottlenecks in the code. After pinpointing the issue to a poorly optimized database query, I refactored it, which improved the response time by 50%.”

4. How do you ensure the quality of your code?

Quality assurance is critical in software development, especially in a regulated industry like healthcare.

How to Answer

Discuss your approach to testing, code reviews, and any methodologies you follow.

Example

“I practice Test-Driven Development (TDD) to ensure my code is reliable from the start. I also participate in regular code reviews with my team to catch potential issues early. Additionally, I use automated testing tools to run regression tests before deployment.”

5. What programming languages are you most comfortable with, and why?

This question assesses your technical proficiency and preferences.

How to Answer

Mention the languages you excel in and provide context on how you’ve used them in your work.

Example

“I am most comfortable with Java and JavaScript. I prefer Java for backend development due to its robustness and extensive libraries, while I use JavaScript for frontend development to create dynamic user interfaces. I recently built a full-stack application using these technologies, which enhanced my skills significantly.”

Behavioral Questions

1. Describe a time when you had to work closely with a team to achieve a goal.

Collaboration is key in software development, and this question evaluates your teamwork skills.

How to Answer

Share a specific example that highlights your role in the team and the outcome.

Example

“In my last project, I worked with a cross-functional team to develop a new feature for our application. I facilitated daily stand-ups to ensure everyone was aligned and encouraged open communication. As a result, we delivered the feature ahead of schedule and received positive feedback from users.”

2. How do you prioritize your tasks when working on multiple projects?

Time management is crucial in a fast-paced environment.

How to Answer

Explain your approach to prioritization and any tools you use to manage your workload.

Example

“I use a combination of Agile methodologies and project management tools like Jira to prioritize my tasks. I assess the urgency and impact of each task and focus on high-priority items first. This approach helps me stay organized and meet deadlines effectively.”

3. Can you give an example of a time you received constructive criticism? How did you handle it?

This question assesses your ability to accept feedback and grow from it.

How to Answer

Discuss a specific instance and how you applied the feedback to improve your work.

Example

“During a code review, a colleague pointed out that my code could be more efficient. I took their feedback seriously and researched best practices for optimization. I implemented their suggestions in my next project, which not only improved my coding skills but also strengthened our collaboration.”

4. How do you stay updated with the latest technology trends?

Continuous learning is essential in the tech industry.

How to Answer

Share the resources you use to keep your skills current.

Example

“I regularly follow tech blogs, participate in online courses, and attend webinars to stay updated with the latest trends. I also engage with the developer community on platforms like GitHub and Stack Overflow, which helps me learn from others’ experiences.”

5. What motivates you to work in the healthcare technology field?

Understanding your motivation can help the interviewer gauge your fit for the company culture.

How to Answer

Express your passion for technology and its impact on healthcare.

Example

“I am motivated by the opportunity to make a difference in people’s lives through technology. Working in healthcare technology allows me to contribute to solutions that improve patient outcomes, which is incredibly fulfilling for me.”