Staff Electric Propulsion Engineer, Hall-Effect Thrusters

Apex Technology, Inc.•Los Angeles, CA

6d•$165,000 - $226,000•Hybrid

About The Position

Apex is seeking a Staff Electric Propulsion Engineer with deep expertise in Hall-effect thrusters to serve as the technical authority for our Hall thruster development and production. Building on Apex's in-house Hall-effect thruster capability, you will own the thruster from plasma physics and discharge channel design through qualification, flight integration, and design-for-manufacturing at rate. This is a Staff-level individual-contributor role with broad technical leadership scope. You will set the Hall thruster technical roadmap, drive key architecture and design trades, lead test and qualification campaigns, and mentor propulsion engineers as we scale our EP capability. As a technical anchor of Apex's EP team, you'll shape how high-performance Hall thrusters are designed for serial production and flown across our spacecraft platforms.

Requirements

Bachelor's degree in aerospace, mechanical, electrical, plasma/propulsion engineering, applied physics, or a related field.
10+ years of relevant electric propulsion experience with a Bachelor's or Master's degree, OR a Ph.D. in electric propulsion, plasma physics, applied physics, or a closely related field with 3+ years of relevant industry experience, with substantial and demonstrable focus on Hall-effect thruster design, development, and testing.
Deep, hands-on knowledge of Hall thruster physics and design, including discharge channel design, magnetic circuit layout, anode and gas distribution, cathode coupling, and thermal management.
Experience planning and executing Hall thruster or EP test campaigns in vacuum facilities, including plasma/plume diagnostics, performance measurement, and long-duration life/wear testing.
Strong understanding of the failure and degradation mechanisms that drive Hall thruster life, including channel and pole erosion, thermal limits, and discharge instabilities, and how to design and test against them.
Working knowledge of spacecraft propulsion system architecture, propellant feed systems, PPU interaction, and range safety requirements (e.g., SSCMAN 91-710).
Demonstrated technical leadership, including setting technical direction, driving complex design trades, and mentoring engineers.
Ability to decompose requirements and ICDs and communicate clearly across engineering disciplines.
Must be a U.S. Person (U.S. citizen, lawful permanent resident, or protected individual) as defined by ITAR (22 CFR §120.15).

Nice To Haves

Direct experience taking a Hall thruster from clean-sheet design through flight qualification and on-orbit operation.
Experience with magnetically shielded, wall-less, and/or unshielded Hall thruster architectures.
Experience with alternative propellants, including krypton and other non-xenon EP propellants, and their effects on thruster performance and life.
Familiarity with Hall thruster plasma simulation tools, including particle-in-cell and hybrid codes, and magnetic FEA.
Familiarity with PPU/thruster drive electronics and power interface definition.
Design-for-manufacturing experience bringing propulsion hardware into serial or high-rate production.
Experience with EP environmental qualification, including vibration, TVAC, and EMI testing of flight propulsion hardware.

Responsibilities

Own the end-to-end design of Apex's Hall-effect thrusters, including discharge channel geometry, magnetic circuit design, anode and gas distributor design, and thermal-mechanical packaging.
Lead the plasma physics and performance modeling that drives thruster design, including ionization and acceleration behavior, magnetic field topology, efficiency, thrust-to-power, and specific impulse across the operating envelope.
Define and execute thruster test and life-qualification campaigns, including performance mapping, plume characterization, thermal testing, oscillation and stability characterization, wear testing, and long-duration life testing in vacuum facilities.
Establish erosion, degradation, and life models for the discharge channel and pole pieces, and demonstrate compliance with mission life and propulsion budgets for power, thermal, throughput, and leak.
Drive cathode-thruster coupling and overall EP system integration in partnership with cathode, propellant feed-system, and PPU owners.
Select materials and processes, including ceramics, magnetic materials, and refractory metals, and qualify them for spaceflight and high-rate production.
Optimize thruster designs for performance, mass, cost, manufacturability, and repeatability, and develop the work instructions, process flows, and AI&T procedures required to build them at rate.
Partner with systems, power electronics, thermal, structures, and avionics teams to define interfaces, including PPU/thruster operating points and gimbal integration, and verify requirements.
Support the build, integration, and test of flight hardware, as well as launch campaigns, on-orbit performance evaluation, and anomaly resolution.
Lead failure analysis, root-cause investigations, and continuous design improvements to support future builds and scalable production.
Provide technical leadership and mentorship across the propulsion team and help build Apex's Hall thruster capability, team, and infrastructure.

Benefits

Equity in Apex
100% company-paid medical, dental, and vision for you and your dependents
$100k life insurance at no cost
15 days vacation, growing to 20+ days annually
10 paid holidays
Competitive 401(k) plan with generous matching
8 weeks paid parental leave
Childcare reimbursement up to $350/day for work-related travel
Daily catered lunch
Unlimited snacks
Monthly office socials
Pickleball tournaments
Run club
Gatherings for you and your family
Your dream desk setup and all the tools you need to be your most productive self