Mechanical Engineer - GCS

Harmattan AI

ABOUT US Harmattan AI is a next-generation defense prime building autonomous and scalable defense systems. Following the close of a $200M Series B, valuing the company at $1.4 billion, we are expanding our teams and capabilities to deliver mission-critical systems to allied forces. Our work is guided by clear values: building technologies with real-world impact, pursuing excellence in everything we do, setting ambitious goals, and taking on the hardest technical challenges. We operate in a demanding environment where rigor, ownership, and execution are expected. ABOUT THE ROLE As a Mechanical Engineer on Harmattan AI's R&D Hardware Tooling team, you will design and build the internal lab fixtures, jigs, rigs, and bench structures that help our engineering teams develop and validate products faster. You will own the mechanical side of tooling end-to-end: from bench and lab fixtures to environmental validation rigs, instrument enclosures, and RF/antenna characterisation mechanics. Unlike product design optimised for mass production, tooling mechanics here prioritise precision, repeatability over many cycles, and fast in-house fabrication. You will work at the intersection of mechanics, electronics, and development across every Harmattan hardware program.   TECHNICAL SKILLS RESPONSIBILITIES * Design fixtures, jigs, enclosures, and bench structures in SolidWorks with full integration of electronics and instrumentation, maintaining complete 2D drawings with GD&T to guarantee fixture precision and repeatability. * Design clamping, alignment, and actuation mechanisms — manual and pneumatic — for repeatable, ergonomic positioning of prototypes during bring-up and characterisation. * Build fixtures rapidly in-house (3D printing, CNC, aluminium framing) and via quick-turn suppliers; iterate fast based on hands-on validation with the tooling hardware and software engineers. * Own the development of bench and lab fixtures, environmental and reliability validation rigs, instrument/DAQ enclosures, RF/antenna characterisation mechanics, and modular bench structures for the R&D teams. * Validate fixture repeatability, durability over many cycles, and operator ergonomics; use basic FEA and thermal/CFD where required (e.g. environmental rigs) to confirm designs. * Manage quick-turn machining and printing suppliers; specify framing hardware and drive procurement with Supply Chain. * Define and maintain a modular, reusable fixture-mechanics standard across product teams, directly reducing bring-up time and improving characterisation repeatability. * Maintain fixture designs, drawings, build instructions, and maintenance records as the single source of truth for the team. CANDIDATE REQUIREMENTS * Engineering degree in Mechanical Engineering, Mechatronics, Consumer Electronics, or equivalent. * Proven experience designing lab or development fixtures, jigs, or rigs — or a track record of shipping physical products with a desire to build the tools behind them. * Proficiency in SolidWorks, including complex assembly modelling and 2D drawings with GD&T. * Hands-on experience with rapid prototyping and in-house fabrication (3D printing, CNC, off-the-shelf framing systems). * Ability to integrate electronics and instrumentation into fixtures and enclosures with reliable measurement access. * Strong instinct for tolerancing, repeatability, and fixture accuracy; comfortable working to tight positional constraints. * Experience with mechanism and actuation design (clamping, alignment, pneumatic) is a strong plus. * Basic FEA and thermal/CFD to validate designs is a nice-to-have. * Appetite for ownership and fast iteration — a maker who gets hands dirty, works independently, and thrives in a small team without heavy process. We look forward to hearing how you can help shape the future of autonomous defense systems at Harmattan AI.

Interstellar Lab

Senior Mechanical Design Engineer Full-time In-person   At Interstellar Lab, our mission is to build a future full of life, on Earth and beyond. We believe in a world where technology enables humans to live in harmony with nature, where biodiversity thrives and expands, and where terrestrial life becomes multi-planetary. To build this future, we design autonomous biospheric systems to grow plants with precision, on Earth and in Space. Our AI-powered BioPods and BioCapsules leverage biosciences to reproduce and optimize growth conditions for a wide variety of high-value plants. On Earth, we pioneer molecular and biofarming, boosting the production of metabolites and bioactive compounds while offering sustainable, traceable, and high-quality natural ingredients to the beauty, fragrance, pharmaceutical, and nutraceutical industries. In space, we collaborate with agencies and private companies to develop biofarming units that advance life science research in microgravity and lay the foundation for future biofactories in space, enabling innovative terrestrial applications and long-duration space missions.   About the Role As Senior Mechanical Design Engineer, you will lead the design and development of mechanical systems for Interstellar Lab’s biospheric technologies. You will work across the full product lifecycle, from early concepts and prototyping to manufacturing and industrialization, ensuring that every component meets performance, reliability, and cost objectives. This role requires strong ownership, curiosity, and the ability to collaborate across disciplines in a fast-paced, mission-driven environment.   Responsibilities * Lead mechanical design from concept to production, balancing performance, cost, and manufacturability * Develop 3D CAD models and detailed 2D drawings using Onshape or equivalent software * Collaborate with electrical, software, and systems engineers to ensure integration and serviceability * Manage large assemblies and ensure configuration control across design revisions * Support prototyping, testing, and validation activities to verify design performance * Optimize designs for industrialization and coordinate with manufacturing partners * Ensure compliance with design standards, reliability criteria, and DFM best practices * Participate in design reviews and provide technical guidance within the engineering team   Profile / Qualifications * Bachelor’s or Master’s degree in mechanical engineering or equivalent * 6+ years of experience in mechanical design, analysis, and manufacturing * Expertise in CAD design (Onshape, SolidWorks, or CATIA) and large assembly management * Solid understanding of materials, mechanical analysis, and industrial processes * Experience with product testing, validation, and design for manufacturability * Comfortable with hands-on prototyping and integration in workshop environments * Strong problem-solving, communication, and teamwork skills * Fluent in English, proficiency in French is a plus   Equal Opportunity Interstellar Lab is proud to be an equal opportunity employer. Interstellar Lab does not discriminate on the basis of race, regional color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with disability, or other applicable legally protected characteristics.

Dioxycle

About Dioxycle Dioxycle is pioneering breakthrough carbon utilization technologies that convert industrial emissions into sustainable chemicals with unprecedented energy and cost efficiency. By displacing fossil fuels for the production of key chemicals, Dioxycle has the potential to ultimately reduce over 800 million tons of CO2 per year, representing over 2% of the world's emissions.    At the core of our process is a novel "carbon electrolyzer", a machine capable of using just electricity and water to convert carbon emissions back into valuable everyday essential chemicals. Our team is innovating across chemical, mechanical and system engineering to turn carbon transformation into an economically feasible, industrial reality through this completely novel technological approach. Having completed our industrial-scale electrolyzer prototype, we are now working with our chemical and downstream offtakers towards First-of-a-kind plant deployment and subsequent commercial roll-out.   We are supported by world-class funders including Bill-Gates-founded Breakthrough Energy Ventures, Lowercarbon Capital and Gigascale Capital and have raised $40M to date. We operate from two centers in Paris and California (so whether you are passionate about outdoors or good food/art scenes, we have a location for you to join!)   Your Mission Dioxycle is seeking a hands-on Automation & Electrical Engineer to join our hardware team. You'll be working directly on the control systems that operate our electrolyzer stacks - programming PLCs, maintaining wiring and instrumentation, and helping us build a scalable deployment architecture as we grow from 40 systems to many more.   This is a role for someone who loves being close to the hardware, is comfortable picking up new tools quickly, and wants to see the direct impact of their work on real physical systems. You'll have real ownership over a critical part of our systems, at a moment when the team and the fleet are both growing fast. The problems are hard, the impact is direct, and the work is never boring.    Your key responsibilities will center around: - Program and maintain PLC-based control systems (Beckhoff) on our lab and field electrolyzer units. This covers lab-scale test units of small and medium size but also includes onsite industrial-scale pilots (that are so big you need to lift them with a crane) - Wire, install, and troubleshoot sensors, actuators, and electrical panels - Work with our team to configure new systems and contribute to how we standardize deployments going forward - Collaborate with Dioxycle's software engineers to integrate HMI graphics with control logic - Participate in the retrofitting of legacy systems with new-generation PLCs - Occasionally interface with existing C-based code on older systems   We're open to a few different profiles - what matters is curiosity, hands-on instinct, and a real interest in automation work. Experience with PLCs is a huge plus.