CNC Machinist

Send your CV to  with the job title of the role you are applying for in the subject line

Location:

London (Factory)

Job Type: Full-time

Program, set and run advanced CNC machines to deliver high-precision components for aerospace, defence, energy and robotics customers.

You will own the full machining lifecycle — from CAM programming and first article prove-out to cycle time optimisation and repeat production — helping build the most efficient factory in the network.

This is a hands-on, high-ownership role for someone who takes pride in tight tolerances, clean setups, and continuous improvement.

Program, simulate and optimise CNC toolpaths (3-axis, 5-axis and mill-turn where applicable)

Set, prove-out and run jobs to aerospace and defence standards

Reduce cycle times and improve machine utilisation

Design and improve fixturing strategies

Select tooling and cutting parameters for challenging materials (e.g. aluminium, steels, titanium, Inconel)

Maintain high quality standards and ensure first-time-right manufacturing

Support new part introduction (NPI) from drawing to production

Contribute to DFM feedback for customers

Work closely with engineering and Mason

OS software teams to improve data capture, scheduling and automation

Standardise programming approaches across sites as we scale

Strong CAM programming experience (e.g. Fusion, Hypermill, Mastercam or equivalent)

Proven ability to machine tight tolerances (±0.01mm and below where required)

Experience setting and running high-end CNC machines (e.g. Hermle, DMG Mori, Mazak or similar)

Deep understanding of feeds, speeds, tooling strategy and work holding

Experience in aerospace, defence or other high-spec industries preferred

Ability to read and interpret complex engineering drawings and GD&T

Comfortable working in a fast-moving, high-ownership environment

5-axis simultaneous machining experience

Experience with probing, automation or pallet systems

Knowledge of AS9100 / ISO
9001 quality systems

Interest in robotics, factory automation and data-driven manufacturing

Work on mission-critical aerospace and defence components

Access to advanced machine tools and evolving automation

Equity participation in a scaling factory network

Opportunity to influence programming standards across sites

High-performance culture focused on continuous improvement

Isembard is on a mission to forge industrial acceleration. We enable faster and cheaper products to be made for critical industries by combining advanced machine tools, robotics and our proprietary software, Mason

OS. The components we manufacture are used in aerospace, defence, energy and other strategically important sectors.