Mechanical Design Engineer
Greenjets builds propulsion for uncrewed and electric aircraft, from electric ducted fans to geared turbofans, and supplies NATO and the UK MoD. They're hiring a Mechanical Design Engineer to turn aircraft concepts into detailed, buildable airframe components and subsystems, based in Milton Keynes on a hybrid basis. This hardware engineering role sits within the UK's aerospace and defence sector.
About Us:
Greenjets is an innovative engineering company developing high-performance propulsion systems for the aviation market. Our work spans research and development, engine production, aircraft systems, technical integration and flight testing. We are committed to delivering high-grade engineering and best-in-class propulsion for unmanned aircraft.
We do things differently. We move fast, we experiment and we adopt technologies that push beyond the current state of the art. Our aim is to go further, faster and more efficiently, while keeping costs competitive.
All our propulsion systems are designed, developed and manufactured in the UK. We focus on high quality, reliable and cost effective products supported by a robust, secure and ethical supply chain.
About the Job:
As a Mechanical Design Engineer at Greenjets, you will take aircraft concepts and turn them into detailed, buildable designs. You’ll own the design of airframe components and mechanical subsystems, producing robust CAD, drawings and tolerancing that work not just in theory, but on the bench and in the hangar.
This role sits at the heart of the aircraft development flow, bridging concept design and hands-on build. You’ll work closely with Aircraft Design Engineers upstream and the Development team downstream to ensure designs transition smoothly from screen to reality.
What You'll Do:
Develop detailed mechanical designs for airframe structures and aircraft subsystems
Produce high-quality 3D CAD models, manufacturing drawings and GD&T
Design for manufacture and assembly, balancing performance, weight, cost and robustness
Work with a mix of 3D printed polymers, metallic components and some composite structures
Support prototype builds directly, troubleshooting fit, function and integration issues
Iterate designs rapidly based on test feedback and real-world constraints
Collaborate closely with aircraft designers, development engineers and field operations
Desirable Qualifications, Experience & Attributes:
Degree (or equivalent experience) in Mechanical Engineering or a related discipline
Strong experience with 3D CAD (e.g. SolidWorks, Fusion, CATIA or similar)
Practical understanding of tolerancing, fasteners, structural design and mechanisms
Comfortable designing parts that will actually be built and assembled
Experience with rapid prototyping and low-volume manufacturing
Hands-on mindset — happy to be involved in the workshop when needed
Aerospace experience is helpful but not required
About Greenjets
Greenjets was founded in 2022 by chief executive Anmol Manohar and chief technology officer Dr Guido Monterzino, and builds propulsion for uncrewed and electric aircraft, with a portfolio running from electric ducted fans to geared turbofan engines. Products include the Sycamore 160 and Aspen 212, designed for higher efficiency, greater speed and a lower acoustic signature than conventional designs, and the team draws on Rolls-Royce, General Electric, BAE Systems and Formula 1 experience. The company sells to NATO, the UK MoD and the German MoD, and was selected under the MoD's Low-Cost Air Defence Effectors programme to build a British low-cost drone interceptor. It grew from 160 to more than 250 staff and expanded UK facilities from 12,000 to nearly 70,000 square feet. The $40M Series A was led by Blossom Capital, with the NATO Innovation Fund, the National Security Strategic Investment Fund, Tanglin Ventures and NSFO Family Office.