Mechanical / Manufacturing Engineer – Injection Moulding & Production

Part-time, 3 days per week · On-site, Northampton · £28,000–£41,000 FTE pro-rata, depending on experience · Closing date: 30 November 2026

About us

Mavis Technologies designs and manufactures AI-powered smart glasses, Mavis Viaro and Mavis Itero, that help blind and visually impaired people read, recognise their surroundings and live more independently. We build our products in our own facility at Vulcan Works, Northampton.

We are now bringing injection moulding in-house.

The role

We are looking for a hands-on engineer to lead the move of our plastic parts production in-house and take ownership of how our glasses are made. You will set up and run our injection moulding machine, design and refine moulds, oversee 3D printing and vacuum-cast parts, and work alongside our production technician on assembly. This is a practical, varied role in a small team. Some days you will be in CAD, others on the machine or the assembly bench.

What you will do

Injection moulding

• Commission and set up our in-house XPM-17 desktop injection moulding machine
• Design, or work with toolmakers on, mould tools for our frames and components
• Run mould trials, set process parameters and solve moulding defects (short shots, sink, flash, warpage)
• Manage materials, drying and machine maintenance
• Build safe, repeatable production processes and work instructions

Prototyping and low-volume production

• Oversee SLA 3D printing (Formlabs Form 4) for prototypes, jigs and production parts
• Manage vacuum-cast frames: quality checks, supplier liaison and the transition to moulded parts
• Design jigs and fixtures to make assembly faster and more consistent

Assembly and quality

• Take part in hands-on assembly of the smart glasses alongside our production technician
• Lead day-to-day production planning and guide production staff
• Carry out inspection and first-article checks, and help improve yield and build quality
• Feed manufacturing lessons back into product design (DFM)

What we are looking for

• Hands-on experience running and setting injection moulding machines
• Experience with mould design or close work with toolmakers
• Practical 3D CAD skills (SolidWorks, Fusion 360 or similar)
• Good understanding of plastics, tolerances and quality inspection
• Happy to get involved in assembly and day-to-day production, not just engineering
• Organised and able to guide others and keep production moving
• An engineering qualification (degree, HND, apprenticeship) or equivalent industry experience

Nice to have

• Experience setting up moulding in a new or small facility
• SLA 3D printing or vacuum casting experience
• Consumer electronics, wearables or medical device background
• Knowledge of machine safety (PUWER) and quality systems such as ISO 9001 / ISO 13485

What we offer

• Flexibility to increase days during busy production or tooling phases, by mutual agreement
• Workplace pension
• The chance to build our in-house manufacturing from the ground up and see the products you make reach the people who rely on them

Location and eligibility

On-site at Vulcan Works, Northampton. Applicants must have the right to work in the UK. We are unable to offer visa sponsorship.

How to apply

Send your CV and a short cover note to jobs@mavistech.uk with the subject “Mechanical Engineer”.