Staff/Senior Mechanical Engineer

San Leandro · Headquarters · USD 130,000-190,000 · 4+ years experience · Onsite · Posted Oct 5, 2026

At a glance

SirenOpt helps manufacturers make better, safer, and more reliable micro- and nano-materials. These materials are the building blocks of critical sectors of the global economy such as batteries, computer chips, aircraft components, and power systems. But, surging material demand and growing complexity are pushing production to unprecedented scales and speeds, leaving manufacturers effectively flying blind. Small, undetected variations during production lead to wastage, lower performance, higher costs, and safety risks.
SirenOpt is changing this by developing a manufacturing intelligence platform that non-destructively probes materials during production, revealing critical internal information without damaging them. Using a novel combination of cold atmospheric plasma, physics-informed machine learning, and predictive analytics, SirenOpt generates unique, real-time material fingerprints that capture material signals not accessible through conventional measurement techniques. These insights give manufacturers unprecedented visibility into how materials behave as they are made.
We turn hidden data into actionable intelligence to help manufacturers reduce variability and thus increase yield and performance. The technology can be deployed as a standalone tool or integrated directly into factory production lines. SirenOpt is currently deploying early versions of its platform with some of the largest industrial manufacturers in the world across North America, Europe, and Asia.

SirenOpt is seeking a Staff or Senior Mechanical Engineer to help deliver a sensing and software platform that can be integrated inside high-volume thin film manufacturing lines.
As an early-stage member of the team, this role allows you to make a real impact on next-generation thin film technologies and help build a solid technical foundation.

Lead the mechanical design and validation of a low-temperature plasma-based metrology sensor platform.
Interface with a small, cross-functional project team to research, develop, and validate new concepts for low-temperature plasma-based metrology.
Perform fundamental studies to characterize and understand the sensitivity of the sensor and platform performance.
Closely interact with clients to iterate on the design based on their feedback, paying close attention to integration speed.
Create and maintain technical design documentation (e.g. requirements, 3D and 2D data, assembly documentation, test processes and test reports).

B.S./M.S. in Mechanical Engineering with minimum of 4 years of relevant industry experience.
Experience autonomously leading independent mechanical design projects, in particular those that involve designing a product that can be integrated into a larger system.
Experience with design of motion control mechanisms, including properly constraining parts, defining datums, tolerance analysis, and using GD&T.
Static and dynamic stress and strain analysis including vibration testing and analysis.
Some familiarity with part quality and measurement setup for CMM or OMM inspection.
Experience with hands-on development of prototypes.
Experience with initiating and maintaining supplier support.
Experience with maintaining awareness of customer needs and iterating on designs accordingly.
Experience with mechanical design for manufacturing lines.
Proficiency with use of CAD and PDM tools (e.g., SolidWorks or OnShape) to design parts and assemblies and prepare technical documentation.

Programing of motion controllers
Familiarity with standards requirements for high-voltage/low-voltage or gas distribution devices
Prior exposure to high-precision, high-throughput industrial designs for material handling, metrology, and/or process automation applications
Design for reliability, manufacturing, and service (DfX)
Ability to independently identify and procure parts, manage supplier relationships, and rapidly fabricate medium-fidelity prototypes using 3D printers, metal stock, optical breadboards, etc.
Experience with metrology equipment and sensors, particularly those used for metrology of advanced materials
Some familiarity with thin films, in particular any those related to Lithium- and Zinc-based battery electrodes, Thermal Barrier Coatings for turbine blades, photovoltaics, optical coatings, displays, packaging materials, semiconducting wafers, and/or adhesives