Senior Engineering Technician (Machinist)

About the Role

As a Sr. Prototype Technician at Droyd, you'll support the day-to-day operation of the prototype lab and help keep hardware work moving. You will take ownership of precision machined parts from start to finish, while also providing crucial cross-functional team support by assisting with 3D printing workflows and assembly tasks as needed. You’ll oversee shop organization, maintain machine readiness, coordinate material handling, and execute the practical tasks that keep prototyping and production efficient.

This is a hands-on role in a fast-paced prototype and R&D environment where you will work closely with engineers and fellow technicians to turn complex designs into high-quality hardware. This role is ideal for someone hands-on, reliable, collaborative, and excited to work around real hardware every day.

This role is based in San Francisco, CA. We're an in-person company. We build faster that way.

In This Role, You’ll

• Machine parts and fixtures to support prototype and production hardware.
• Work from CAD models, drawings, and engineering input to produce accurate components using detailed engineering prints and advanced GD&T callouts.
• Program, set up, and operate CNC machines for fast-turn and repeatable work, including 3-axis CNC mills and lathes across a wide array of materials.
• Support iteration on mechanical designs with strong attention to tolerances, tooling, and manufacturability, providing actionable design-for-manufacturability (DFM) feedback to engineers.
• Develop efficient CAM programs utilizing Fusion 360 (or other industry-standard software) to define tooling strategies, cutting parameters, and toolpaths for complex geometries.
• Design and fabricate custom workholding, including soft jaws and vacuum fixtures for one-off and low-volume prototype parts.
• Inspect and verify parts using calipers, micrometers, height gauges, and indicators, executing process adjustments to prevent machining defects or tolerance drift.
• Provide secondary operational support for 3D printing technologies (FDM, Resin, SLS), assisting with machine minding, material preparation, build clearing, and routine post-processing.
• Serve as a backup operator for basic cable fabrication and harness assembly, assisting as needed to interpret schematics, pinouts, and wiring diagrams to support electrical builds.
• Help improve shop throughput, part quality, and repeatability by documenting machining and additive setups, process instructions, and inspection logs.
• Coordinate with engineers and assembly teams to prioritize urgent work, helping to balance shop logistics, capacity, and material needs.
• Maintain strong standards for safety, cleanliness, and machine care, including preventative machine maintenance and strict EHS lab compliance.

We’re Looking for Someone Who

• Has strong hands-on machining experience, including 3+ years of precision CNC programming, setup, and multi-axis machining in a fast-paced prototype or R&D environment.
• Has strong experience working with CNC machines and setting up CAM tool paths for 3-axis to 5-axis equipment (Fusion 360 proficiency preferred).
• Understands tooling, workholding, tolerances, and machining strategy at a high level, with a deep understanding of feeds, speeds, and holding tight dimensions below 0.001 inch (0.025mm).
• Can produce quality parts with speed and consistency across various engineering metals, polymers, and ceramics.
• Is comfortable working closely with engineering teams in a rapid prototyping environment, communicating clearly when flagging drawing ambiguities or geometric risks.
• Has strong attention to detail and pride in shop work, showing solid organization and independent judgment when resolving hardware issues.
• Can adapt quickly as priorities change under demanding schedule constraints.
• Is highly organized and comfortable in a hands-on technical environment, with the physical ability to stand for long periods and lift up to 50 lbs.
• Works well with both technicians and engineers, acting as a dependable cross-functional partner on the floor.
• Is proactive, dependable, and eager to learn emerging fabrication workflows.
• Thrives in a fast-paced hardware environment where ownership and execution are critical.

Nice to Have

• Exposure to other shop workflows such as basic 3D printing, laser cutting, or post-processing operations.
• Experience programming or operating CMMs or working with advanced metrology platforms.
• Experience with TIG welding, advanced sheet metal fabrication, or other structural joining processes.
• Experience documenting data (inspection logs, nonconformances, setup sheets) within an MES, PLM, or ERP system.