Principal Mechanical Engineer

WHO ARE WE?

Sateliot is a Barcelona-based Startup in the New Space sector, becoming the first satellite telecommunications operator that will provide global and continuous connectivity to all the elements that will make up the massive Internet of Things (IoT) universe under the 5G protocol.

In order to do so, Sateliot is launching a constellation of last generation nanosatellites, located at low altitude that act as mobile towers. Sateliot is the perfect complement for large telecommunications companies by providing them with the necessary infrastructure where terrestrial technologies do not arrive.

YOUR MISSION

Sateliot is seeking a Principal Mechanical Engineer to lead mechanical and thermal-structural engineering across the full lifecycle of an advanced LEO satellite platform and payload antenna system.

This role requires a deep first-principles approach to mechanical design, combined with hands-on expertise in developing lightweight, deployable, semi-rigid space structures that must survive launch loads, deploy reliably in orbit, and maintain performance through aggressive LEO thermal cycling.

The successful candidate will take ownership from early concept and detailed design through manufacturing, qualification, integration, testing, and on-orbit support.

YOUR MAIN FUNCTIONS

Mechanical Architecture & Structural Leadership

Own the mechanical design of the satellite bus structure and payload antenna assemblies.

Lead architecture decisions using physics-based first principles reasoning, balancing mass, stiffness, thermal stability, and manufacturability.

Drive structural trade-offs for LEO-class spacecraft where volume and mass efficiency are critical.

Deployable & Lightweight Space Structures

Design and qualify deployable mechanisms and semi-rigid lightweight structures (antenna deployment systems, panels, booms, hinges).

Ensure robust repeatability, stiffness, and dimensional stability after deployment.

Address latch design, hold-down release mechanisms, tolerances, and deployment dynamics in orbit.

LEO Orbital Mechanical Environment Expertise

Design spacecraft structures for the unique challenges of LEO operation, including:

High-frequency thermal cycling (eclipse transitions)

Thermo-elastic distortion affecting payload pointing and RF performance

Atomic oxygen degradation of exposed materials

Microgravity-induced structural behaviour changes

Launch Survivability & Mechanical Qualification

Ensure all mechanical systems meet launcher and environmental requirements, including:

Random vibration

Acoustic loading

Shock events (separation, pyro-shock)

Define qualification and acceptance approaches suitable for LEO constellation-style deployment, balancing reliability and production cadence.

Full Engineering Lifecycle Ownership

Lead mechanical development through the complete lifecycle:

Concept design and prototyping

Detailed CAD and manufacturing release

Supplier engagement and production readiness

Assembly, Integration & Test (AIT)

Qualification campaigns (vibration, thermal vacuum, deployment testing)

Structural Analysis & Verification

Oversee structural analysis activities, including:

FEM development and correlation

Modal analysis, static margins, buckling, dynamic response

Establish verification plans compliant with ECSS/NASA/launcher requirements.

Support hardware test execution, anomaly resolution, and design iteration.

Cross-Functional Technical Leadership

Act as mechanical technical authority interfacing with systems, RF, thermal, avionics, manufacturing, and mission teams.

Mentor engineers and elevate structural/mechanical rigor across the organization.

REQUIREMENTS

General

MSc or PhD in Mechanical Engineering, Aerospace Engineering, or related discipline.

10+ years of experience delivering flight mechanical hardware for spacecraft or high-reliability aerospace systems.

Strong first-principles structural and thermal-mechanical reasoning capability.

Proven experience designing for:

Launch vibration and shock environments

Thermal-vacuum operation in LEO

Deployable spacecraft structures and antenna systems

Tools & Technical Competencies

Structural simulation: ANSYS, Abaqus

Understanding of coupled thermal-structural effects preferred

Experience with qualification documentation, test correlation, and margin tracking

Personal Attributes

Physics-driven engineer with deep curiosity and rigor

End-to-end ownership mindset across design test flight

Strong balance of analytical depth and practical build/test execution

Comfortable working in fast-paced, high-performance LEO development environments

NICE TO HAVE

Mechanical ownership of deployable antenna reflectors, phased-array panels, booms, or other lightweight space deployable.

Deep familiarity with spacecraft structural materials and processes:

CFRP composites

Aluminium and titanium alloys

Precision machining and additive manufacturing where appropriate

Working knowledge of atomic oxygen, outgassing, contamination, and material selection for LEO.

Experience supporting cleanroom integration and test campaigns.

WHAT YOU’LL FIND WHEN WORKING AT SATELIOT:

You will be part of one the fastest-growing start-ups in Spain with global reach along getting into the challenging world of New Space & Telecommunication.

Our culture is based on embracing openness by welcoming multicultural talent, being respectful with everybody and being open to exchange ideas. We are also committed to a healthy lifestyle by helping our team balance their work and personal life and also by providing them facilities for healthy habits.

We are a driven team with big goals, that seek for people who are genuinely passionate about their work and that also want to keep learning and getting better personally and professionally!

WHAT DO WE OFFER?

Full time permanent Contract

Hybrid Work Model

Schedule flexibility

Flat and transparent organizational structure

Buddy Program to help you with your integration during your first month

Flexible compensation package: Tax benefits with ticket restaurant, transportation and kindergarten, training programs.

We promote good physical and mental health, with a Health insurance, Fresh fruit in the office and the possibility of sharing the cost of bicycle transport or gyms.

Work in a dynamic, multidisciplinary and multicultural environment that will allow you to boost your professional career

To be part of a strong, international, friendly and motivated team, where you can progress both personal and professionally

The chance to be part of one of the most exciting and disruptive space projects in Europe