Senior Mechatronics Engineer

Juul Labs • San Francisco, CA

3d

About The Position

Juul Labs's mission is to transition the world’s billion adult smokers away from combustible cigarettes, eliminate their use, and combat underage usage of our products. We have the opportunity to address one of the world’s most intractable challenges through a commitment to exceptional quality, research, design, and innovation. Backed by leading technology investors, we are committed to the same excellence when it comes to hiring great talent. We are a diverse team that is united by this common purpose and we are hiring the world’s best engineers, scientists, designers, product managers, operations experts, and customer service and business professionals. If the opportunity to build your career is compelling, read on for more details. The Internal Tools team builds the infrastructure that Juul’s hardware and firmware programs run on. This includes test automation frameworks, CI pipelines, aerosol science instruments, electromechanical fixtures, and the software that ties it all together. We’re a small team of generalists who own projects from first principles to final handoff and work directly with the engineers who depend on what we build. If you’re equally comfortable writing a Python test harness and assembling a precision fixture, you’ll fit right in. Expectations Work cross-functionally with Firmware, Product Design, Chemistry, and Regulatory teams to translate program needs into reliable, well-documented tooling. Design and develop test systems and automation tooling. This includes software frameworks, electromechanical fixtures, and instrumentation. Contribute to the team’s CI/firmware testing infrastructure by developing modular, maintainable test platform components in close collaboration with the firmware engineering team. Own projects end-to-end. Capture requirements and drive system architecture through fabrication, software integration, validation, and handoff to stakeholders. Proactively identify gaps, flag risks early, and propose solutions without waiting to be directed. Consistently produce clear, thorough documentation that enables peers and stakeholders to self-serve and build on your work. Actively leverage AI coding assistants and LLMs as a first-order productivity multiplier for code generation, debugging, documentation, data analysis, and design iteration.

Requirements

• 7+ years of hands-on experience in mechatronics, hardware/electrical engineering, or a closely related discipline, with demonstrated ability to work effectively across mechanical, electrical, and software domains.
• Strong EE fundamentals: circuit design, analysis, schematic capture, PCB layout and review (Altium preferred, or equivalent), embedded microcontrollers, sensors, and analog/digital instrumentation.
• Familiarity with Rust or other systems-level programming languages; the team is actively moving toward Rust-based tooling.
• Proficiency in Python (or equivalent) for test automation, data acquisition, and analysis scripting.
• Proven experience designing and building automated test fixtures or custom electromechanical systems.
• Strong systems-level thinking: able to decompose complex problems, design across the full stack, and reason clearly about failure modes and edge cases.
• Currently and actively using AI tools (coding assistants, LLMs) as a core part of your daily engineering workflow.
• Clear, concise communicator with strong documentation discipline; comfortable working directly with non-engineering stakeholders.

Nice To Haves

• Experience in consumer electronics, vapor/aerosol science instrumentation, or factory test environments.
• Proficiency in CAD (SolidWorks preferred, Fusion 360, Onshape, or equivalent) for fixture and enclosure design.
• Familiarity with LabVIEW, NI DAQ, or similar instrumentation frameworks.
• Experience with IoT architectures or embedded Linux control systems.
• Background in precision mechanics, vacuum systems, or optical/analytical instrumentation.

Responsibilities

• Work cross-functionally with Firmware, Product Design, Chemistry, and Regulatory teams to translate program needs into reliable, well-documented tooling.
• Design and develop test systems and automation tooling. This includes software frameworks, electromechanical fixtures, and instrumentation.
• Contribute to the team’s CI/firmware testing infrastructure by developing modular, maintainable test platform components in close collaboration with the firmware engineering team.
• Own projects end-to-end. Capture requirements and drive system architecture through fabrication, software integration, validation, and handoff to stakeholders.
• Proactively identify gaps, flag risks early, and propose solutions without waiting to be directed.
• Consistently produce clear, thorough documentation that enables peers and stakeholders to self-serve and build on your work.
• Actively leverage AI coding assistants and LLMs as a first-order productivity multiplier for code generation, debugging, documentation, data analysis, and design iteration.

Benefits

• A place to grow your career. We’ll help you set big goals - and exceed them
• People. Work with talented, committed and supportive teammates
• Equity and performance bonuses. Every employee is a stakeholder in our success
• Cell phone subsidy, commuter benefits and discounts on JUUL products
• Excellent medical, dental and vision, disability, and life insurance, plus family support, wellness, legal, and employee assistance program benefits
• 401(k) plan with company matching
• Plus biannual discretionary performance bonuses

What This Job Offers

• Job Type: Full-time
• Career Level: Senior