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Engineering 7 Construction 1
Outside IR35 Contractor principal engineer

9 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
Mar 14, 2026  
Principal Structural Engineer
Chartered Structural Design Engineer (Contract – Outside IR35) Location: Aberdeen Engagement: Limited Company Contractor Duration: Minimum 12 months Sector: Refining, Chemical Manufacturing & Pipeline Assets Overview Burnside Recruitment is seeking an experienced Chartered Structural Design Engineer to support a long-term programme of modifications and upgrades across major onshore refinery, chemical manufacturing, and pipeline infrastructure. This is a 12‑month+ contract, operating outside IR35, and ideally suited to a limited company contractor. Key Responsibilities • Lead structural design and assessment activities for brownfield heavy civils projects within complex process plant environments. • Deliver structural calculations, reports, design packages, and technical documentation to UK regulatory and industry standards. • Provide technical oversight on modifications, upgrades, and integrity improvements • Interface with multidiscipline engineering teams, site personnel, and...
IR35 Status:
Outside IR35

CV-Library AB10, Aberdeen, Aberdeen City Contractor
CL
Mar 11, 2026  
Principal/Senior HV Design Engineer
Our client is looking to appoint a Principal / Senior HV Design Engineer to join their Energy team. The ideal candidate will have strong UK HV design experience, particularly working with 132kV and 400kV systems.   This is an excellent opportunity to work across a diverse portfolio of technically complex projects for clients nationwide. Schemes may include Data Centres, HVDC, interconnectors, wind farms, substations, BESS, geotechnical solutions, protection systems, LVAC, FEED studies, and reconnection works.   This is a 6-month contract outside IR35, requiring attendance at the client's London office 3 days per week.   Key Responsibilities ·Develop HV system designs from concept through to detailed design, including design reviews, cost estimation, site supervision, and technical support as required. ·Provide specialist technical guidance on all aspects of HV engineering and system design. ·Produce plant and equipment technical specifications, cable route and power...
IR35 Status:
Outside IR35

CV-Library Central London, London WC2N 5DU, 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 14, 2026  
Mechanical Design Engineer
Mechanical Design Engineer - Greater Manchester Our client has an open requirement for a Mechanical Design Engineer on a 6 month contract basis with the possibility for further extension. This will operate on an outside IR35 basis so limited company contractors will be able to operate, and a rate between £35 and £43 per hour is expected, subject to level of experience and suitability. Candidates will be required to work in the office full time initially and then switch to a hybrid model of 3 days office based and 2 from home after a few weeks’ orientation. The client is looking for a good engineering background first and foremost with strong experience and knowledge of typical mechanical equipment and terminology including: Limits and fittings, bearings, linear guides, GD&T’s, rotating equipment, and automated equipment such as motors, gearboxes, and drives. They should also have a basic knowledge of working with steel structures. The client is using Creo design software -...
IR35 Status:
Outside IR35

CV-Library Eccles, City and Borough of Salford Contractor
CL
Mar 13, 2026  
Principal Piping Designer
Principal Piping Designer – Contract (Outside IR35) Location: Aberdeen | Hybrid (minimum 3 days in office) A respected engineering consultancy is seeking a Principal Piping Designer to shape complex brownfield projects across the Oil & Gas and wider Energy landscape. From Concept through FEED to Detailed Design, Construction and Commissioning, your fingerprints will be on work that truly moves the sector forward. Note: This position requires attendance at the Aberdeen office at least three days per week. The Opportunity You will guide plant layout and piping design using the latest digital and CAD technologies, steering a team toward precision, safety, and excellence. Reporting to the Lead Piping Engineer, you’ll ensure every deliverable meets the highest standard. What You’ll Be Trusted With Leading and mentoring a team of piping designers to deliver on time and within budget Owning all plant layout and piping design outputs - 3D models, isometrics, GAs, plot plans, and...
IR35 Status:
Outside IR35

CV-Library Aberdeen, UK Contractor
CL
Mar 12, 2026  
Quality Engineer
Infinity Employment are seeking FAIRS Engineers with Q pulse experience to work on behalf of our Industry leading client, specialising in providing Engineering Solutions to various sectors. You will be responsible for fully supporting the Quality Manager in maintaining company quality expectations through compliance to company policies, system procedures, work instructions and specifications. Driving improvements, the Quality Engineer will ensure the timely completion of 8D investigations and be the first point of contact for any quality escalations. This contract will be based in Cheltenham for a 3- 6 month contract, highly likely to be extended. Must have an aerospace background and experience within a manufacturing environment. For the right candidates, more contracts will follow. £26 p/h LTD (Outside IR35) Early finish on a Friday. Principal Responsibilities: * Ensure the timely completion of 8Ds including the implementation of corrective actions * Completion of FAIR...
IR35 Status:
Outside IR35

CV-Library Cheltenham, Gloucestershire 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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