---
title: 'Propulsion Engineer at Poseidon Aerospace'
canonical: 'https://feeny.ai/job/propulsion-engineer-poseidon-aerospace-alameda-j764pv1hrkqc'
type: 'job'
last_seen: '2026-09-07'
---

# Propulsion Engineer at Poseidon Aerospace

- **Company:** Poseidon Aerospace
- **Location:** Alameda
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-09-05
- **Last confirmed live:** 2026-09-07
- **Apply:** https://jobs.ashbyhq.com/poseidonaero/f7515313-eeec-4b81-ba26-f4fabe33aa22

## 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

- Competitive salary and meaningful early-stage equity
- Relocation support if applicable
- Low-ego, collaborative workplace culture
- 6% retirement matching
- Unlimited PTO
- Free lunches, snacks, and a stocked fridge at our offices
- AI tools and subscriptions

## WHAT YOU GET FROM US

- Competitive salary and meaningful early-stage equity
- Relocation support if applicable
- Employee Health Benefit Plans
- 6% Retirement matching
- Flexible PTO
- Free lunches, snacks, and a stocked fridge at our offices
- AI tools and subscriptions

## About Poseidon Aerospace

## Company Overview
- **One-liner**: Poseidon Aerospace is reimagining logistics with autonomous aircraft built to move goods faster, cheaper, and anywhere they are needed, fundamentally changing the cost curve for air freight.
- **Entity Type**: Private (Startup)
- **Headquarters**: San Francisco, California, United States
- **Founded**: Not publicly available
- **Founders**: David Zagaynov (CEO)

## Core Business
- **Primary industry**: Aerospace, Aviation, and Defense Logistics
- **Target customers**: Government/Defense (military logistics), Commercial logistics providers, and Enterprise supply chains
- **Mission**: To make air logistics as affordable and flexible as possible by driving the cost per ton-mile down to levels never before achieved in aviation, building the unmanned backbone of tomorrow's logistics.

## Products & Services
- **Seagull (Unmanned Cargo Aircraft)**: An autonomous, unmanned cargo drone designed to lift two tons. The aircraft is a seaplane, requiring no airports or runways—only water—to operate. This unlocks millions of miles of navigable waterways for logistics. The platform is built from the ground up as a clean-sheet design, leveraging composites and advanced manufacturing.

## Market Standing
- **Valuation/Market Cap**: Not publicly available
- **Total Funding**: $12.4 million USD
- **Funding Rounds**:
    - Pre-Seed: Led by Starship Ventures (1 investor)
    - Seed (2025-01-01): $1.4M from 2 investors
    - Seed (2025-11-01): $11.0M from 7 investors, led by Tamarack Global
- **Notable Investors/Partners**: Tamarack Global (Lead), Starship Ventures, Sean Hoge (Lead Investor)
- **Growth Signals**: Headcount grew +366.7% year-over-year to 20 employees; actively hiring for high-impact roles; secured a partnership with Northeastern’s Roux Institute and their National Security Innovation Hub to expand presence in Maine; FY2026 NDAA includes a provision for a pilot program for contracted amphibious aircraft, validating the market.

## Competitive Advantages
- **Seaplane Design**: The aircraft requires no airports or runways, only water, unlocking millions of miles of navigable waterways and making logistics possible in remote, contested, or infrastructure-poor regions.
- **Cost Curve Disruption**: By driving down the cost per flight-ton-mile, Poseidon aims to make air cargo as affordable as ground or maritime transport, a fundamental shift in logistics economics.
- **Defense & Government Focus**: The company is strategically aligned with U.S. national security priorities, specifically "contested logistics" as highlighted by the Department of Defense, giving it a clear and funded customer base.
- **Speed & Agility**: As a small, focused team (20 employees), the company claims to move with immense speed, building clean-sheet autonomous planes from scratch using advanced composites and manufacturing techniques.

## Strategic Focus
- **Scaling the Team**: Actively hiring across engineering, operations, and government relations to support rapid growth (headcount up +366.7% YoY).
- **Government & Defense Contracts**: Winning contracts is a core focus, with a dedicated Proposal Lead role and a Director of Government Relations position. The company is positioning itself to be a key player in the U.S. military's "contested logistics" strategy.
- **Expanding Manufacturing & Presence**: Partnering with Northeastern’s Roux Institute in Maine to build a presence in a region with a deep aerospace heritage and access to a national security innovation hub.
- **Product Development**: Building and iterating on the "Seagull" unmanned cargo aircraft, with a focus on composites and clean-sheet design.

## Why Work Here
- **High-Impact, Early-Stage Environment**: The company has grown from 4 to 20 people in a short period, offering the chance to build foundational systems and processes from the ground up.
- **Cutting-Edge Technology**: Work on clean-sheet autonomous aircraft, advanced composites, and manufacturing engineering in a fast-paced, iterative environment.
- **Mission-Driven**: The work directly impacts national security and global logistics, with a clear, compelling mission to make air cargo as affordable as ground transport.
- **Culture & Perks**: On-site work in San Francisco, CA. The company emphasizes a "punch above its weight" culture with a focus on engineering excellence and speed. Active hiring for high-impact roles across engineering, operations, and government relations.
- **Recent Growth**: The team has grown from 4 to 20 people in a short period, offering significant ownership and career growth opportunities for early employees.

## Sources
1. [poseidonaero.com](https://www.poseidonaero.com/)
2. [LinkedIn - Poseidon Aerospace](https://www.linkedin.com/company/poseidon-aerospace)
3. [Built In - Poseidon Aerospace](https://builtin.com/company/poseidon-aerospace)
4. [Ashby - Poseidon Aerospace Jobs](https://jobs.ashbyhq.com/poseidonaero)

## Other roles at Poseidon Aerospace

- [Senior Recruiter](https://feeny.ai/job/senior-recruiter-poseidon-aerospace-alameda-8n3y3p2ks94f) — Alameda
- [Proposal Lead](https://feeny.ai/job/proposal-lead-poseidon-aerospace-washington-fy2rdhdr2w3v) — Washington, DC
- [Pilot](https://feeny.ai/job/pilot-poseidon-aerospace-alameda-7r9ygx47zmpp) — Alameda
- [Operations Associate](https://feeny.ai/job/operations-associate-poseidon-aerospace-alameda-b79xt48vnsjy) — Alameda
- [Mechanical Engineer](https://feeny.ai/job/mechanical-engineer-poseidon-aerospace-alameda-pr6p7816nv70) — Alameda
- [Manufacturing Engineer](https://feeny.ai/job/manufacturing-engineer-poseidon-aerospace-alameda-5gqg860wyvxs) — Alameda
- [Maine Composites Bridge](https://feeny.ai/job/maine-composites-bridge-poseidon-aerospace-alameda-dpk4eetefz67) — Alameda
- [Lead Mechanical Engineer, Airframe](https://feeny.ai/job/lead-mechanical-engineer-airframe-poseidon-aerospace-alameda-cmzp9ptrpq8q) — Alameda
- [Head of Finance](https://feeny.ai/job/head-of-finance-poseidon-aerospace-alameda-t4js5ys7mnfg) — Alameda
- [GNC Engineer](https://feeny.ai/job/gnc-engineer-poseidon-aerospace-alameda-3rfbvjesjenj) — Alameda