Calyxo, Inc. is a medical device company headquartered in Pleasanton, California, USA. The company was founded in 2016 to address the profound need for improved kidney stone treatment. Kidney stone disease is a common, painful condition that consumes vast amounts of healthcare resources each year. Our team is led by executives and investors with a proven track record of commercializing paradigm-shifting devices to meet unmet needs within urology.

Are you ready to change the future of kidney stone treatment? We are seeking high achievers who want to be part of a dynamic team working in a fun, diverse atmosphere.

The Instruments Engineering team is a highly energetic and actively growing team that is responsible for developing and ultimately driving Calyxo’s instruments and accessories through to launch. As a Mechanical Engineering Intern on the Instruments team, you will support the design and development of new solutions for both released and next-generation critical components and accessories, integrating these solutions alongside the vision, sensors, and software R&D teams. You will be immersed in a highly collaborative and multidisciplinary team, teaming up with cross-functional partners including Manufacturing and Quality to bring novel concepts through all phases of development to commercialization.

In This Role, You Will:

Partner with an engineer to design, develop, and prototype new ideas.
Design and fabricate testing or assembly fixtures.
Develop test methods to evaluate engineering prototypes.
Perform relevant component or device testing and associated data analysis.
Create and implement documentation, including drawings, protocols, and reports.
Work closely with Manufacturing, Quality, and other functional areas to progress projects.
Perform other duties as required.

Who You Will Report To:

Sr. R&D Engineer

Requirements:

Education: Recent graduate or current junior/senior pursuing a bachelor’s degree in mechanical engineering, biomedical engineering, or related field
Work location: Pleasanton, CA
Travel: 0-10% travel required
Full time employment
Ability to take a data-driven approach to methodically solve problems
Excellent verbal/written communication skills; ability to present and convey ideas to an audience of mixed backgrounds
Ability to work both independently and collaboratively
Eagerness to learn and take on new challenges
Proficiency with Microsoft Office
Experience with SolidWorks; intermediate-level highly preferred
Experience with Minitab
Ability to lift up to 10 pounds; sit for up to 8 hours/day; work with hazardous materials
Compliance with relevant county, state, and Federal rules regarding vaccinations.

Preferred Qualifications:

Experience with hands-on prototyping (machine shop, hand tools, 3D printing) highly preferred
Previous medical device or other regulated industry internship experience

What We Offer:

At Calyxo, you will be part of a knowledgeable, high-achieving, experienced and fun team. You will work in a diverse work environment with experienced, proven leaders and have an opportunity to shape our company culture. You will experience constant learning and dynamic challenges to help you grow and be the best version of yourself.

We also offer a compensation plan as follows:

Competitive hourly rate of $28/hr (undergrad) - $30.00/hr (graduate students)

Application close date: March 9, 2026

Calyxo is deeply committed to fostering an environment where diversity and inclusion are not only valued but also prioritized. We believe a diverse and inclusive community empowers us to act courageously, care deeply, and dream boldly to impact people in big ways. Diverse viewpoints bring diverse capabilities, which strengthen our focus and fuel our growth.

Calyxo is proud to be an equal opportunity employer, seeking to create a welcoming and diverse environment. All applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, veteran status or any other applicable legally protected characteristics

Legal authorization to work in the United States is required. In compliance with federal law, all persons hired will be required to verify their identity and eligibility to work in the United States and to complete the required employment eligibility verification form upon hire.

Disclaimer:

At Calyxo, we prioritize a transparent and structured interview process to ensure the best fit for both our candidates and our team. Please be aware of the following:

Structured Interview Process: Our hiring process includes multiple stages of interviews where you will have the opportunity to communicate directly with Calyxo employees. This ensures that you gain a comprehensive understanding of the role and our company culture.
Verification of Identity: We do not extend job offers without first meeting candidates, either virtually or in person. This step is crucial to maintain the integrity of our hiring process and to ensure mutual alignment.
Beware of Scams: Calyxo will never request sensitive personal information, such as your full name, address, phone number, or identification documents, via email or online forms before an official interview. Calyxo representatives will always contact you using an email format of [email protected]. If you receive a request for information from any other domain, please contact us directly at [email protected] to verify the legitimacy of the communication.

We appreciate your interest in joining Calyxo and look forward to getting to know you through our official channels.

Mechanical Engineering, Instruments Intern - Pleasanton, CA

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