Mechanical Design Engineer

Mechanical Design Engineer Contract: 6 Months | Outside IR35 Working: Monday–Friday | 3 Days Office-Based Sector: Rail, Utilities & Airports Employer: Principal Contractor The Role: We are looking for an experienced…

Outside IR35 Engineering
Contract type Contract
Posted 17 August 2026

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About this contract

Mechanical Design Engineer

Contract: 6 Months | Outside IR35
Working: Monday–Friday | 3 Days Office-Based
Sector: Rail, Utilities & Airports
Employer: Principal Contractor

The Role:

We are looking for an experienced Mechanical Design Engineer to join a Principal Contractor delivering major infrastructure projects across the Rail, Utilities and Airport sectors.

The role will focus on delivering detailed mechanical building services designs, with a strong emphasis on HVAC systems. You will work as part of a multidisciplinary design team, supporting projects from detailed design through to construction.

Key Responsibilities:

* Deliver detailed mechanical and HVAC designs.

* Produce drawings, layouts, specifications and technical documentation.

* Carry out design calculations and equipment sizing.

* Coordinate designs with multidisciplinary teams.

* Ensure designs meet relevant standards and client requirements.

* Resolve technical queries and support design reviews.

* Work closely with project and construction teams.

* Deliver design packages to programme and quality requirements.

Key Requirements:

* Experience as a Mechanical Design Engineer within building services.

* Strong HVAC design experience.

* Experience working on major infrastructure or construction projects.

* Experience within Rail, Utilities, Airports or similar sectors desirable.

* Principal Contractor experience advantageous.

* Good knowledge of UK standards and building services regulations.

* Experience with AutoCAD and/or Revit MEP desirable.

* Relevant engineering qualification preferred.

Contract Details:

* 6-month contract

* Outside IR35

* Monday to Friday

* 3 days per week in the office

* Major infrastructure projects

* Principal Contractor environment

This is a great opportunity for a Mechanical Design Engineer with strong HVAC/building services experience to work on major UK infrastructure projects

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