Mechanical Design Engineer

LEX Diagnostics Limited; England; On-site; GBP 80,000 - 100,000; Full time

Job summary

A leading diagnostics company in the UK is seeking a Mechanical Engineer to develop solutions that enhance infectious disease testing. The successful candidate will use CAD and work across multiple engineering disciplines to ensure designs are practical and effective. The role offers a chance to see your designs transition from concept to production while contributing to life-saving diagnostic tools.

Benefits

10% employer pension contribution (+3% personal contribution)

Private Medical Insurance & Life Insurance (Family Cover)

25 days' holiday plus bank holidays

Discounts and memberships to local sports facilities and theatres

Qualifications

• Experience in mechanical engineering, particularly in developing manufacturable designs.
• Strong communicative skills for cross-disciplinary teamwork.
• Ability to apply engineering principles in practical contexts.

Responsibilities

• Formulate design and product requirements for technical needs.
• Support design choices with first-principles analysis.
• CAD design and prototype iteration.
• Demonstrate design performance through experimentation.
• Design with manufacture and assembly in mind.

Skills

Problem-solving

CAD proficiency

First-principles analysis

Interdisciplinary collaboration

Job description

Overview

At LEX Diagnostics, we're rethinking how the world tackles infectious disease. Our technology is enabling faster, more accurate testing, right where it's needed most. Every design decision here has the potential to directly improve patient care around the world.

Opportunity

We're looking for a Mechanical Engineer who thrives on solving complex problems and turning ideas into manufacturable solutions. You'll spend as much of your time in CAD as in the lab, conceptualising, modelling, testing and refining designs that need to perform flawlessly when they leave the lab and become real, working products.

But this isn't just pushing geometry around in a model. You'll be working at the intersection of mechanical, thermal, fluidic, optical, and electrical disciplines, creating designs that bring all of these together into a robust, reliable product.

Why this role matters

Our diagnostics are used in settings where every second counts. The design solutions you spearhead, and the engineering principles you apply, directly determine how reliably our devices work in the real world. From the first sketch to the final assembly, your designs will be pivotal to getting life–saving tools into the hands of clinicians.

What you'll be doing

• Formulating design and product requirements to meet genuine technical needs.
• Supporting design choices with first–principles analysis, so that every feature is grounded in engineering reasoning.
• Working across disciplines to ensure the design is not only clever, but also practical, robust, and scalable.
• CAD, modelling concepts, iterating prototypes, and working with the wider team to produce detailed drawings for manufacture and assembly.
• Demonstrating the performance of your designs with experimental rigour.
• Designing with manufacture and assembly in mind, whether reworking an existing concept or creating something brand new.

Benefits

• 10% employer pension contribution (+3% personal contribution)
• Private Medical Insurance & Life Insurance (Family Cover)
• Life insurance
• 25 days' holiday plus bank holidays
• Discounts and memberships to local sports facilities and theatres

Why join LEX Diagnostics?

• Be part of a mission driven company making a global impact.
• Work with a multidisciplinary team of experts who value creativity, collaboration, and evidence–based engineering.
• See your CAD designs and prototypes move quickly from concept to production, we iterate fast, and you'll see the results of your work in real devices.
• Join a growing company where your input can shape both our products and our future.

If you love spending time in CAD and experimenting in the lab, turning ideas into manufacturable designs, and applying first–principles thinking to multidisciplinary challenges, we'd love to hear from you.

Apply now and help us design the future of diagnostics.