Propulsion Engineer

Poseidon Aerospace

Berkeley (CA)

On-site

USD 130,000 - 180,000

Full time

7 days ago

Be an early applicant

Application generator

A complete application in a minute — tailored resume and cover letter, ready to send.

Get past ATS filters

Benefits offered by this job

Relocation support

Equity—early‑stage

6% retirement matching

Unlimited PTO

Free lunches & snacks

AI tools & subscriptions

Job summary

Poseidon Aerospace in the San Francisco Bay Area seeks a Propulsion Engineer to lead our propulsion team from assembly to flight readiness. This hands‑on role focuses on engine assembly, tuning, qualification, and testing on instrumented stands.

You will run tests, develop procedures, and collaborate across disciplines to validate performance and durability. A passion for aviation and hands‑on engine work will help you thrive in our fast‑paced environment.

Qualifications

Hands-on EFI piston engine tuning experience in aviation or motorsport.
Experience qualifying engines on a test cell, dyno, or test stand.
Knowledge of aviation fuels and calibration effects.
Bench and on-aircraft troubleshooting ability.

Responsibilities

Calibrate engines across the full aviation envelope: ECU tuning, fueling, ignition, idle stability, and governor settings.
Run engine test programs on instrumented stands: break‑in, mapping, endurance, and flight‑ready qualification.
Bring up integrated engines from assembled hardware, diagnose faults, and close out anomalies.
Operate test instrumentation and DAQ to drive propulsion system improvements.
Translate findings, present data, and collaborate to drive design changes across teams.
Develop break‑in, operating, inspection, and maintenance procedures for test stands.

Skills

ECU tuning

Engine dyno

Test stand operation

Powerplant calibration

AvGas/MoGas knowledge

Diagnostics

Job description

About Poseidon Aerospace

Poseidon Aerospace is reimagining how the world moves goods. We build and operate full-size autonomous cargo aircraft - capable of carrying two tons of payload over a thousand nautical miles. From remote communities to contested logistics operations, our platforms unlock a new cost curve for air freight, making it faster, cheaper, and accessible anywhere it's needed. Headquartered in the San Francisco Bay Area with locations in Washington DC, Oregon, and Maine; we're building something consequential.

About The Role

As a Propulsion Engineer at Poseidon Aerospace, you will lead the propulsion team’s development from initial assembly and bring‑up to a fully calibrated, instrumented powerplant ready for flight. This is a hands‑on role centered on engine assembly, design, tuning, and qualification via testing. You will run engines on the test stand, develop test procedures, prove they meet performance and durability targets, and collaborate cross‑functionally to iterate and improve on the propulsion system.

If you have an interest in aviation, working hands‑on in a test environment, motorsports or high performance engine tuning experience, and have strong instincts running an engine test cell, we are looking for you to join Poseidon.

Responsibilities

Calibrate the engine across the full aviation operating envelope: fueling, ignition, idle stability, transient response, knock, and closed-loop strategy on a standalone ECU, with the propeller governor tuned to performance and reliability targets.
Run the engine test program on an instrumented test stand: break‑in, bring‑up, performance mapping, and endurance/qualification runs that prove each engine flight‑ready.
Bring up the integrated engine from assembled hardware through verification: Outfit assemblies, prepare systems, diagnose faults, and close out anomalies.
Operate test instrumentation and DAQ: Specify and collect required data to drive propulsion system improvements and validation in a safe and traceable manner.
Translate & Present findings: Distill, document, and present data to validate requirements, limits, and drive design changes. Work closely with other teams to refine and improve propulsion systems.
Refine & Develop the break‑in, operating, inspection, and maintenance procedures: Document and collect the procedures that carry the propulsion systems through test stand runs, ground runs, and flight tests.

Core Skills

Applied tuning of standalone/aftermarket ECUs: Fuel and ignition mapping, idle and transient control, drive‑by‑wire, knock, and sensor/DTC strategy.
Strong conceptual and hands‑on knowledge of 4‑stroke piston engines
Engine test‑stand or dyno experience: Experience building or running an instrumented cell, including thrust/torque measurement, cooling and oil‑system instrumentation, and DAQ.
Working knowledge of aircraft propeller and constant‑speed governor systems.
Sharp diagnostic, setup, and troubleshooting skills.
Familiarity with controlled assembly and maintenance standards: FOD prevention, tool management, and shop safety.

Qualifications

Hands‑on experience tuning, calibrating, and bringing up EFI piston engine systems: Aviation, motorsport, engine‑swap, or standalone‑ECU backgrounds are strongly relevant.
Experience qualifying or validating engines on a test cell, dyno, or test stand, and ideally through ground and flight testing.
Practical knowledge of aviation and automotive fuels (AvGas, MoGas) and their effect on calibration.
Comfortable working at the bench and on the aircraft, with strong, self‑directed troubleshooting instincts.
Strong collaboration skills to communicate verification findings and design feedback clearly across disciplines.

What You’ll Get From Us