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Contractor 6
Outside IR35 principal engineer

6 principal engineer jobs found

CL
Mar 15, 2026  
Principal Temporary Works Engineer
Principal Temporary Works Engineer Contract: Long-term Location: Remote with required site/office visits Rate: Competitive Scope: Outside IR35 Overview Our client is a leading UK infrastructure delivery specialist, supporting major national programmes across transportation, energy, water, defence, and complex engineering environments. They are recognised for delivering high-integrity design and construction solutions on some of the country’s most critical and technically demanding projects. With a strong focus on safety, innovation, and sustainable delivery, they work in partnership with government and industry to modernise and maintain essential infrastructure. We are seeking a Principal Temporary Works Engineer to join a specialist design team on a long-term contract. You will lead temporary works engineering activities across a range of complex projects, ensuring safe, compliant, and efficient design solutions. This role requires strong technical leadership, design assurance...
IR35 Status:
Outside IR35

CV-Library Greater London, UK Contractor
CL
Feb 27, 2026  
Principal C&I Engineer (Fire & Gas Systems)
Principal C&I Engineer (Fire & Gas Systems) – Contract – West Wales / Hybrid Location: West Wales / Hybrid This is an excellent opportunity to join a leading engineering business during a period of continued growth as they support the Oil & Gas, Petrochemical, Renewable Energy, Hydrogen and Nuclear sectors. Fire and Gas experience at both FEED and detailed design stages is essential. TUV Certified status would be a bonus, though not essential. Our client is based in West Wales and can accommodate a hybrid working pattern. Role & Responsibilities * Leading the design of fire and gas systems, including design specifications, cause and effect diagrams, and system architecture. * Performing safety specification and certification of safety instrumented systems. * Selecting and specifying instruments suitable to ensure compliance with safety regulations. * Designing C&I systems with a specific focus on fire and gas detection and suppression systems....
IR35 Status:
Outside IR35

CV-Library SA72, Burton Ferry, Pembrokeshire Contractor
CL
Mar 20, 2026  
Mechanical Engineer - Outside iR35 Contract
I am working with a client who specialises in water and waste water technologies and usually trades over seas. They are currently working on a massive waste water plant expansion programme in the Middle East, which depending on how the next rounds of bidding go, could need work for the next 5-10 years. The contract would run for 6 months initially, the budget is not fixed and would rather welcome the daily rate expectation attached to each profile they receive. The role can be performed remotely with occasional visits to the Middle East. Requirements: Mechanical engineering with waste management or water plant experience Solid process engineering experience Someone who has experience working with the Principal Contractor, not just client side Call me, Alex Manea, at NonStop Recruitment now for a confidential conversation. Contact me on (email address removed) or (phone number removed), please send your CV in word format OR if this does not sound like the opportunity for...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
Mar 18, 2026  
Senior Civil Engineer
Senior Civil Engineer (Chartered) Location: Birmingham Office Contract: 6 Months (ASAP Start) Engagement: Outside IR35 Sector: Transmission MRR Infrastructure is recruiting for a Chartered Senior Civil Engineer to join a highly respected engineering organisation delivering major UK transmission infrastructure projects. This is a six-month contract opportunity, confirmed as outside IR35, based within the Birmingham office. The Opportunity You will operate in a senior technical capacity within the Civil and Structural team, leading design activities across high-voltage transmission projects from concept through to detailed design and construction support. This role is suited to an experienced Chartered Civil Engineer who is confident leading design packages, mentoring engineers, managing client interfaces and delivering complex infrastructure solutions within regulated environments. The Organisation Our client is a globally established, employee-owned engineering and...
IR35 Status:
Outside IR35

CV-Library Birmingham, West Midlands (County) Contractor
CL
Dec 28, 2025  
Senior Electrical Design Engineer
We are working with a leader in the hyper scale global data centre space -their portfolio includes hyperscale facilities for global tech giants, multi-megawatt data halls, and cutting-edge colocation sites. This is an opportunity to work with a team that sets the benchmark for technical excellence and innovation in the data centre sector. The data centres are at stage two and three so a good time to become involved. The position is as a Senior or Principal Electrical Engineer, you will play a key role in designing and delivering complex electrical systems for large-scale data centres collaborating with multidisciplinary teams to ensure resilient, high-performance solutions for some of the most advanced facilities in the industry. What you'll need to succeed Strong experience in HV, LV, generators, and UPS systems, or a willingness to learn and develop in these areas. Proven background in electrical design within building services. Ability to manage projects and mentor...
IR35 Status:
Outside IR35

CV-Library London, UK Contractor
CL
Dec 11, 2025  
Senior Electrical Design Engineers
Great opportunity with a market leader to join their mission critical team working on key long term projects within the DC space - both hyper scale and co-lo. They are a global player with an outstanding market leader with a great pipeline of future work They are looking for experienced senior/ principal or associate level design engineers to join them or a long term basis working on a hybrid or semi-remote basis (by agreement) You should have current and developed experience as an electrical design engineer within the building services space and also with the mission critical / data centre space. Excellent rates and position outside ir35 Your expert recruitment consultant is Trevor Parsons, call today on (phone number removed) or email (url removed) Eden Brown is committed to equality in the workplace and is an equal opportunity employer. Eden Brown is acting as an Employment Business in relation to this vacancy
IR35 Status:
Outside IR35

CV-Library City of London, London Contractor
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