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.

Summary:

Calyxo is seeking a highly skilled and innovative Sr. Systems Integration and Test Engineer. In this role, you will independently design and build advanced R&D test fixtures, architect and execute verification strategies, and drive system-level integration testing for a next-generation kidney-stone treatments.

This is a deeply hands-on, cross-functional role that blends mechanical, electrical, firmware, clinical, and system-level engineering. You will work directly with design teams, clinical engineering, and system architects to define, measure, and validate performance in both benchtop test fixtures and simulated clinical use environments.

Your work will directly shape system requirements, test methods, and performance metrics — and ultimately impact clinical outcomes in the kidney stone space.

In This Role, You Will:

Test Fixture Design & Development

Independently design, build, and validate fluidic, mechanical, and optical R&D test fixtures.
Own the full lifecycle of fixtures: creative concept, CAD (SolidWorks), fabrication coordination, hardware integration, data acquisition, and refinement.
Integrate sensors for pressure, flowrate, vacuum, optical metrics, and other key performance parameters.
Develop light Python scripts for data processing, device interaction, and basic automation.

Systems Integration & Verification

Own system-level integration testing for the endoscopic platform.
Lead development of performance-focused test methods, especially around fluidics and clinical-relevant behaviors.
Create and execute verification plans at the system and subsystem level in coordination with design and development teams.
Work within a phase-gated (waterfall) program while helping drive agile testing practices inside R&D.

Requirements & Traceability

Collaborate with systems architects to define, refine, and quantify system requirements.
Ensure requirements are measurable, testable, and clinically relevant.
Support development and evolution of traceability matrices, verification protocols, and engineering documentation.

Clinical & Biologic Model Testing

Partner with clinical engineering to develop methods for capturing essential data from benchtop biologic and ex vivo models.
Support occasional large-animal lab activities as needed to evaluate integrated system performance.

Cross-Functional Collaboration

Work closely with teams across mechanical, electrical, firmware, systems, quality, and clinical engineering.
Serve as a key technical voice representing test and integration considerations in design reviews and architecture decisions.

Who You Will Report To:

Sr. Manager, Systems and Test Engineering

Requirements:

Bachelors degree in Mechanical or Biomedical Engineering, Masters or PhD preferred.
7+ year's experience.
Demonstrated expertise in fluidics or vacuum-based systems.
Strong hands-on experience with:
- Data acquisition systems
- Fluidic and vacuum test equipment
- Instrons or mechanical pull/force systems
- Sensors for pressure, flowrate, and mechanical metrics
SolidWorks proficiency (designing fixtures, assemblies, and test hardware).
Python scripting for data processing and basic device/fixture control.
Deep familiarity with medical device standards and quality systems (e.g., 60601-1, 62366-1, 62304), especially as they relate to performance testing and verification.
Ability to independently drive fixture design, test method development, and system integration activities with minimal oversight.
Excellent communication and cross-functional collaboration skills.
Strong problem-solving skills and experience working as part of multifunctional technical project teams through all development lifecycle phases.
Experience in requirements definition, design verification, change management and risk control.
Excellent technical writing and verbal communication skills.
Ability to work independently or in a team setting required.
Must be self-directed, self-motivated and be able to multi-task in a fast-paced environment with multiple priorities.
Knowledge and ability to interpret and follow applicable regulations, guidelines, and policy statements is required. Must have experience working under quality systems designed to meet governmental regulations such as FDA QSR, ISO 13485, and the MDD.
Travel: Minimal, less than 5%
Work location: Pleasanton (Rosewood), on-site 4-5 days a week

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 an attractive compensation package, which includes:

A competitive base salary of $155,000.00 - $165,000.00 and variable incentive plan
Stock options – ownership and a stake in growing a mission-driven company
Employee benefits package that includes 401(k), healthcare insurance and paid vacation

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.

Sr. Systems Integration and Test Engineer - Pleasanton, CA

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