Mechanical Engineering Technician (Junior–Senior)

Stealth Startup - Deep Tech; Greater London; On-site; GBP 42,000 - 52,000; Full time

Job summary

Stealth Startup - Deep Tech is seeking a practical mechanical technician to join the engineering team. You will turn concepts into working hardware through prototyping, fabrication and testing, building and modifying prototypes and documenting results.

You’ll maintain test rigs, run performance and environmental tests, troubleshoot issues and implement practical design improvements, with a focus on precision and quality in a hands-on lab environment.

Qualifications

• A degree in Mechanical Engineering or related field, or equivalent experience.
• 2+ years of experience in a mechanical, manufacturing or engineering lab environment.
• Comfortable using hand tools, power tools and general workshop equipment.
• Strong attention to detail and record-keeping habits, with experience writing clear technical documentation such as SOPs and test reports.
• Clear communication skills and the ability to work independently and as part of a team.

Responsibilities

• Prototype builds and fabrication: Build, assemble and modify prototypes, fixtures and test set-ups. Fabricate and rework parts using 3D printers, laser cutters, drills and other hand and power tools.
• Mechanical testing: Set up and run performance, durability and environmental tests, recording and summarising results clearly.
• Test-rig reliability: Maintain and calibrate test rigs so the team can rely on them for consistent, repeatable testing.
• Troubleshooting and improvements: Investigate mechanical issues and suggest practical changes to designs, build methods and processes.
• Precision measurement and inspection: Use digital microscopes, callipers, micrometers and other precision instruments to check that parts meet specifications.
• Technical documentation: Write and maintain SOPs, work instructions, test protocols and reports. Keep bills of materials, engineering change records and test documentation up to date.
• Supplier and manufacturing coordination: Work with suppliers, manufacturers and production staff on parts, quotes and build issues.
• Lab and workshop standards: Keep the workspace organised, safe and compliant with health and safety procedures.

Skills

Attention to detail

Documentation

Communication

Independent work

Teamwork

Education

Degree in Mechanical Engineering or related field

Tools

CAD software

GD&T

Data acquisition

3D printing

Laser cutting

Machining

Soldering

Job description

We’re building a new way to measure and understand the molecular world. We’re a stealth mode, venture-backed and grant-funded deep-tech company developing a proprietary photonic sensing platform, bringing powerful molecular measurement into miniaturised, low-cost and low-power technology.

Our mission is to make molecular changes measurable, initially focused on healthcare applications. We’re backed by leading European VCs, experienced health-tech investors and strategic operators, alongside significant non-dilutive funding from SPRIN-D, Germany’s Federal Agency for Breakthrough Innovation. We’re bringing together chemistry, biology and photonics to tackle difficult scientific problems and build technology with the potential for global impact.

The role

Work hands-on with our engineering team to build, test and improve mechanical systems, from test rigs to our products. You’ll turn concepts into working prototypes, fabricate and assemble parts, run mechanical tests and document the results. You’ll also maintain and calibrate our test rigs, keeping them reliable and ready for use.

We’re looking for a practical, detail-focused technician who enjoys building things, troubleshooting mechanical problems and helping engineers turn ideas into working hardware.

You will own

• Prototype builds and fabrication: Build, assemble and modify prototypes, fixtures and test set-ups. Fabricate and rework parts using 3D printers, laser cutters, drills and other hand and power tools.
• Mechanical testing: Set up and run performance, durability and environmental tests, recording and summarising results clearly.
• Test-rig reliability: Maintain and calibrate test rigs so the team can rely on them for consistent, repeatable testing.
• Troubleshooting and improvements: Investigate mechanical issues and suggest practical changes to designs, build methods and processes.
• Precision measurement and inspection: Use digital microscopes, callipers, micrometers and other precision instruments to check that parts meet specifications.
• Technical documentation: Write and maintain SOPs, work instructions, test protocols and reports. Keep bills of materials, engineering change records and test documentation up to date.
• Supplier and manufacturing coordination: Work with suppliers, manufacturers and production staff on parts, quotes and build issues.
• Lab and workshop standards: Keep the workspace organised, safe and compliant with health and safety procedures.

The person

• A degree in Mechanical Engineering or a related field, or equivalent experience.
• 2+ years of experience in a mechanical, manufacturing or engineering lab environment.
• Comfortable using hand tools, power tools and general workshop equipment.
• Strong attention to detail and record-keeping habits, with experience writing clear technical documentation such as SOPs and test reports.
• Clear communication skills and the ability to work independently and as part of a team.

Ideal requirements

• Experience in medical device development, ideally within an ISO 13485 quality management system.
• Working knowledge of CAD software and the ability to interpret engineering drawings, including GD&T.
• Familiarity with data acquisition systems, sensors or test automation.
• Exposure to manufacturing processes such as 3D printing, laser cutting, machining and injection moulding.
• Experience handling, assembling and inspecting miniature or micro-scale components.
• Experience with electromechanical components such as PCBs, pumps, valves and heating elements, alongside soldering, wiring and crimping.

Why work for us

• Build globally leading technology: Help turn breakthrough photonic sensing research into products with the ambition to set a new standard for molecular measurement.
• Solve difficult, meaningful problems: Work hands-on to build, test and improve the hardware behind a new sensing platform.
• Move fast with real ownership: Take responsibility for builds, tests and documentation, with the opportunity to suggest improvements and see them put into practice.
• Build alongside a multidisciplinary team: Work closely with engineers and contribute practical insight as the technology moves from prototypes towards real-world use.
• Ambition with a funded foundation: Build on venture and SPRIN-D backing to pursue technically demanding work with the potential to make molecular measurement more accessible and useful in healthcare.