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Inside IR35 Contractor mechanical project engineer

75 mechanical project engineer jobs found

CL
Dec 17, 2025  
MEP Commissioning Technician
A freelance opportunity, inside IR35, exists for an experienced Mechanical Commissioning Technician on a nuclear decommissioning project. Reporting to the Commissioning Engineer, your duties will include – Ensuring Safety is the highest priority on the project with a continued strive towards Zero Harm. Being a role model for all aspects of safety, ensuring a proactive approach to nuclear, radiological, conventional and environmental safety Carrying out all testing activities throughout all stages of commissioning Contributing to the production of test documentation Contributing to the initiation and implementation of FOBs and TQs Performing testing activities for witnessing by third parties Application and removal of Temporary Commissioning Aids Contributing to the recording of supporting data in accordance with test requirements Ability to utilise completions management systems to manage commissioning activities Ability to perform commissioning work against a...
IR35 Status:
Inside IR35

CV-Library Cumbria, UK Contractor
CL
Dec 17, 2025  
Senior Structural Engineer
Senior Structural Engineer Position Type Contract Location North East England Categories Engineering, Construction PM Group is seeking a Senior Structural Engineer for a Pharmaceutical client in the North East. Responsibilities * Working as part of the project management team, working to deliver a portfolio of structural steel, cladding & fabrication projects. * Supporting the project manager in scoping and delivery of the projects portfolio. * Working with projects team to monitor delivery of projects. * Overseeing technical building design, ensuring schedule is on spec and reviewing technical specifications. * Review and interpret engineering drawings, specifications and erection plans. * Technical oversight of the scope, design and procurement of project. * Construction management including construction timeline, in order to ensure delivery of projects on time and within budget constraints. * Working alongside existing client engineers, managers, and...
IR35 Status:
Inside IR35

CV-Library North East, UK Contractor
CL
Dec 14, 2025  
Building Services Engineer
On behalf of our client, we are seeking to recruit a Building Services Engineer on an initial 12 -month contract. As the Building Services you will be overseeing and inspecting building services installations (Mechanical, Electrical, and Fabric) on our projects to ensure they meet the highest standards of quality, compliance, and design specifications. Role: Building Services Engineer Pay: Up to £40 per hour Via Umbrella Location: Portsmouth or Stevenage Contract: Monday - Friday 37 hours per week, 12 months IR35 Status: Inside Security Clearance: BPSS and must be able to get SC clearance Responsibilities Site Inspection & Quality Assurance: Conduct regular, thorough site inspections of all building services and building installations (HVAC, plumbing, electrical, fire systems, controls, structure etc.) to ensure compliance with drawings, specifications, statutory regulations (e.g., Building Regulations, Health & Safety), and industry best practices. Defect...
IR35 Status:
Inside IR35

CV-Library Portsmouth, Hampshire Contractor
CL
Dec 13, 2025  
Electronics Design Engineer
On behalf of our client, we are seeking a Electronics Design Engineer to join my client on an initial 12 month contract. As the Electronics Design Engineer you will be responsible for developing cutting-edge electronic solutions for weapon systems. This will include on board missile sub-systems and Land, Sea and Air based Firing Units. Your role will entail responsibility for the quality and performance of the electronic solution together with providing cost and schedule updates to a project manager. Role: Electronics Design Engineer Pay: Up to £58 per hour via Umbrella Location: Stevenage Contract: Monday - Friday 37 hours per week, 12 months contract IR35 Status: Inside Security Clearance: Security Clearance before starting Responsibilities: You will be responsible for developing cutting-edge electronic solutions for weapon systems. This will include on board missile sub-systems and Land, Sea and Air based Firing Units. Your role will entail responsibility for the...
IR35 Status:
Inside IR35

CV-Library Stevenage, Hertfordshire Contractor
CL
Dec 12, 2025  
NX Engineer
NX Engineer Location: Derby (Hybrid Options Available) Employment Type: Contract (Inside IR35) Day Rate: £500per day About the Role ARM is seeking an experienced NX Engineer to support major programmes within the UK's nuclear and high-integrity engineering sectors. This is an exciting opportunity to contribute to nationally significant projects involving complex mechanical systems, precision engineering, and high-standards design environments. You will be responsible for creating, modifying, and managing 3D CAD models and manufacturing drawings using Siemens NX and Teamcenter. The role requires strong modelling, drafting, and design interpretation skills, as well as the ability to work collaboratively within multidisciplinary teams. Key Responsibilities Produce detailed 3D models and assemblies from design concepts and specifications Generate high-quality manufacturing drawings for components Work closely with design teams to ensure models and drawings align with design...
IR35 Status:
Inside IR35

CV-Library Derby, Derbyshire Contractor
CL
Dec 11, 2025  
Senior or Principal Mechanical Engineer
Contract Opportunity: Senior / Principal Mechanical Engineer - Hybrid (Sellafield Projects) Rate: £51-£61 per hour (Inside IR35) Location: Hybrid - 3 days per week in Cumbria office Sector: Nuclear - Task Delivery Projects Are you an experienced Mechanical Engineer ready to lead and deliver complex projects for Sellafield? We are seeking a Senior or Principal Mechanical Engineer to provide technical expertise and drive the delivery of task-based projects across the site. This hybrid role combines focused on-site work in Cumbria with the flexibility to work remotely. Key Responsibilities: Deliver and manage mechanical engineering tasks across multiple project stages Develop and review designs, calculations, and technical documentation Ensure compliance with Sellafield standards, nuclear safety requirements, and site licence conditions Support design reviews, risk assessments, and HAZOP activities Mentor and guide junior engineers, providing technical leadership and...
IR35 Status:
Inside IR35

CV-Library Cumbria, UK Contractor
CL
Dec 11, 2025  
Asset Protection Engineer
Are you an Asset Protection Engineer with experience in civil, mechanical and electrical projects? Have you worked in both construction and design on multi discipline projects?   Contract Length: 6 months Location: Swindon (On site or in office 3 days per week) Rate: £350-£400 umbrella (Inside IR35)   The Asset Protection Engineer will lead compliance with Network Rail's engineering-driven safety requirements, ensuring robust technical advice, approvals, and risk mitigation across outside and third-party schemes. This role safeguards railway operations and infrastructure integrity while supporting safe, cost-effective, and environmentally responsible project delivery. Essential Requirements ·Technical qualifications to HNC/HND or equivalent GNVQ level. ·Experience managing outside/third-party activities and mitigating associated risks. ·Relevant engineering experience, ideally across multi-disciplinary construction and design projects. ·Strong knowledge of technical,...
IR35 Status:
Inside IR35

CV-Library Swindon, UK Contractor
CL
Dec 11, 2025  
Principal Mechanical Engineer
Principal Mechanical Engineer (12 month contract) Location: Warrington or Preston or Leicester (Hybrid working) Rate: £60a-£80 per hour (Umbrella, inside IR35) Clearance: Must be eligible for NNPPI and SC security clearance A great opportunity has just opened up for a Principal Mechanical Engineer to support a major UK defence decommissioning programme focused on the safe, sustainable dismantling of legacy assets. This is a highly regulated environment where engineering quality, safety and innovative problem solving are absolutely central. The role involves leading mechanical engineering activities on complex decommissioning systems, with a strong focus on mechanical handling, cutting technologies, and integration of bespoke tooling into challenging environments. What you'll be doing Leading multidisciplinary engineering teams and overseeing delivery of complex mechanical design solutions. Acting as the primary technical point of contact for internal and external...
IR35 Status:
Inside IR35

CV-Library Warrington, Cheshire Contractor
CL
Dec 11, 2025  
Principal Mechanical Engineer
Principal Mechanical Engineer (12 month contract) Location: Warrington or Preston or Leicester (Hybrid working) Rate: £60a-£80 per hour (Umbrella, inside IR35) Clearance: Must be eligible for NNPPI and SC security clearance A great opportunity has just opened up for a Principal Mechanical Engineer to support a major UK defence decommissioning programme focused on the safe, sustainable dismantling of legacy assets. This is a highly regulated environment where engineering quality, safety and innovative problem solving are absolutely central. The role involves leading mechanical engineering activities on complex decommissioning systems, with a strong focus on mechanical handling, cutting technologies, and integration of bespoke tooling into challenging environments. What you'll be doing Leading multidisciplinary engineering teams and overseeing delivery of complex mechanical design solutions. Acting as the primary technical point of contact for internal and external...
IR35 Status:
Inside IR35

CV-Library Leicester, Leicestershire Contractor
CL
Nov 13, 2025  
Mechanical Design Engineer
World Class Defence Organisation is currently looking to recruit 3x Mechanical Design Engineer subcontractors on an initial 6 month contract. This role would suit a Mechanical Design Engineer who comes from a strong Defence or Aerospace background has strong Creo / PRO-E skills.         Job Title:  Mechanical Design Engineer Rate: £50.00 per hour Location: Your base site can be either Stevenage or Bristol, depending on your preference Hybrid / Remote working: 4 days per week onsite and 1 day remote (flexible on start and finish time) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) Mechanical Design Engineer Job Description: An opportunity to become part of Europe’s No. 1 Missile Systems Designer, as a Mechanical Design Engineer. You will work closely with other functional teams, to develop products to...
IR35 Status:
Inside IR35

CV-Library Stevenage, UK Contractor
CL
Nov 13, 2025  
Mechanical Design Engineer
World Class Defence Organisation is currently looking to recruit 3x Mechanical Design Engineer subcontractors on an initial 6 month contract. This role would suit a Mechanical Design Engineer who comes from a strong Defence or Aerospace background has strong Creo / PRO-E skills.         Job Title:  Mechanical Design Engineer Rate: £50.00 per hour Location: Your base site can be either Stevenage or Bristol, depending on your preference Hybrid / Remote working: 4 days per week onsite and 1 day remote (flexible on start and finish time) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) Mechanical Design Engineer Job Description: An opportunity to become part of Europe’s No. 1 Missile Systems Designer, as a Mechanical Design Engineer. You will work closely with other functional teams, to develop products to...
IR35 Status:
Inside IR35

CV-Library Bristol, UK Contractor
CL
Oct 31, 2025  
Mechanical Design Engineer
World Class Defence Organisation is currently looking to recruit 3x Mechanical Design Engineer subcontractors on an initial 6 month contract. This role would suit a Mechanical Design Engineer who comes from a strong Defence or Aerospace background has strong Creo / PRO-E skills.     Job Title:  Mechanical Design Engineer Rate: £50.00 per hour Location: Stevenage Hybrid / Remote working: 4 days per week onsite and 1 day remote (flexible on start and finish time) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) Mechanical Design Engineer Job Description: An opportunity to become part of Europe’s No. 1 Missile Systems Designer, as a Mechanical Design Engineer. You will work closely with other functional teams, to develop products to meet our customer’s needs. Within this role you will have the opportunity to...
IR35 Status:
Inside IR35

CV-Library Stevenage, UK Contractor
CL
Sep 25, 2025  
Senior Mechanical Design Engineer
Senior Mechanical Design Engineer – Automotive Test Facilities  Gaydon, Warwickshire 7-month contract Rates: Negotiable (Inside IR35) We are seeking a Senior Mechanical Design Engineer to join a leading automotive organisation, supporting the development and delivery of advanced vehicle test facilities. This role is ideal for an experienced engineer who enjoys working on complex test rigs, bespoke fixtures, and facility components that enable cutting-edge vehicle testing. The Role You’ll be responsible for the design, validation and delivery of test rigs and facility components used across a wide range of engineering labs, including structural, durability, NVH, climatic, and safety testing. Projects will vary from component-level to full vehicle applications, giving you exposure to multiple disciplines. Key Responsibilities Design test rigs and components using 3DX/Catia V6, from concept to delivery. Produce 2D manufacturing drawings for internal workshops and external...
IR35 Status:
Inside IR35

CV-Library Gaydon, Warwick CV35, UK Contractor
CL
Sep 23, 2025  
Industrial Manufacturing Auditor
World Class Defence Organisation is currently looking to recruit 2x Industrial Manufacturing Auditor subcontractors on an initial 6 month contract.  The role can be based from either the companies Stevenage or Bolton site, depending on your preference.  The role will be predominantly working from home with just two day’s onsite. Trained auditor to AS9100 is essential. This role would suit a candidate with a strong Supplier Quality Engineer background.   Job Title: Industrial Manufacturing Auditor Rate: £35.00 per hour Location: Stevenage or Bolton site, depending on your preference   Hybrid / Remote working: 2 day per week onsite Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) Industrial Manufacturing Auditor Job Description: An opportunity has arisen for an Industrial Engineering Auditor professional to...
IR35 Status:
Inside IR35

CV-Library Bolton, UK Contractor
CL
Sep 18, 2025  
Mechanical Design Engineer
World Class Defence Organisation is currently looking to recruit 3x Mechanical Design Engineer subcontractors on an initial 6 month contract. This role would suit a Mechanical Design Engineer who comes from a strong Defence or Aerospace background has strong Creo / PRO-E skills.      Job Title:  Mechanical Design Engineer Rate: £50.00 per hour Location: Your base site can be either Stevenage or Bristol, depending on your preference Hybrid / Remote working: 4 days per week onsite and 1 day remote (flexible on start and finish time) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) Mechanical Design Engineer Job Description: An opportunity to become part of Europe’s No. 1 Missile Systems Designer, as a Mechanical Design Engineer. You will work closely with other functional teams, to develop products to meet...
IR35 Status:
Inside IR35

CV-Library Stevenage, UK Contractor
CL
Sep 18, 2025  
Mechanical Design Engineer
World Class Defence Organisation is currently looking to recruit 3x Mechanical Design Engineer subcontractors on an initial 6 month contract. This role would suit a Mechanical Design Engineer who comes from a strong Defence or Aerospace background has strong Creo / PRO-E skills.      Job Title:  Mechanical Design Engineer Rate: £50.00 per hour Location: Your base site can be either Stevenage or Bristol, depending on your preference Hybrid / Remote working: 4 days per week onsite and 1 day remote (flexible on start and finish time) Contract: 37 Hours per week Overtime: Hours worked over 37 hours per week will be calculated at ‘time and a quarter’ Duration: 6 Months (initially and then ongoing and long-term thereafter) IR35 status: Inside IR35 (Umbrella) Mechanical Design Engineer Job Description: An opportunity to become part of Europe’s No. 1 Missile Systems Designer, as a Mechanical Design Engineer. You will work closely with other functional teams, to develop products to meet...
IR35 Status:
Inside IR35

CV-Library Bristol, UK Contractor
CL
Dec 17, 2025  
Manufacturing Engineer
Join a world-renowned aerospace and defence organisation as a Manufacturing Engineer in Washington, Newcastle on a full time onsite basis Would you like to join a global aerospace and defence organisation? Do you want to work as part of an organisation protecting people and maintaining maximum national security? Due to a drive for greater success, this advanced manufacturing business is currently searching for a Manufacturing Engineer to add to their talented, hardworking team in Washington on a 12 month contract. Striving for innovation and creativity you can ensure no two days will be the same. Rate: £44.40 per hour inside IR35 The role: This role is responsible for the development of manufacturing processes from concept through to commissioning and qualification. You must be able to demonstrate a proven capability in developing manufacturing processes including system integration. - Develop new manufacturing processes, in line with Engineering Plans and Budgets. Technical...
IR35 Status:
Inside IR35

CV-Library Washington, Tyne and Wear Contractor
CL
Dec 17, 2025  
FPGA Design Engineer
FPGA Design Engineer 6-month contract Based in Stevenage Offering circa £80ph Inside IR35 Do you have experience using FPGA? Are you an experienced design engineer? Do you want to work with an industry-leading company? If your answer to these is yes, then this could be the role for you! As the FPGA Design Engineer, you will be working alongside a market-leading Defence and Aerospace company who are constantly growing and developing. They are always looking to bring on new talents such as yourself and further develop your skills to enable you to grow within the company and industry. Due to the nature of the work you will be involved in, you will be required to obtain UK SC clearance in this role. What you will be involved in: You will be involved in the design, development, and proving of key products throughout the product lifecycle from concept to in-service support. Architecture and Requirement definition. Working with hardware and system engineers to define the FPGA...
IR35 Status:
Inside IR35

CV-Library Stevenage, Hertfordshire Contractor
CL
Dec 17, 2025  
Electronics Design Engineer
Electronics Design Engineer 12 Month Contract Based in Stevenage Offering £58ph Inside IR35 Do you have strong experience in Electronic Design? Do you have experience throughout the product lifecycle? Do you want to work with an industry-leading company? If your answers are yes to these, then this could be the role for you! As the Electronics Design Engineer, you will be working alongside a market-leading Defence and Aerospace company who are constantly growing and developing. They are always looking to bring on new talents such as yourself and further develop your skills to enable you to grow within the company and industry! You will be involved in: Developing cutting-edge electronic solutions Responsibility for the quality and performance of the electronic solution together with providing cost and schedule updates to a project manager Electronic design capability throughout the product life cycle Implement technical solutions will range across the Power and Analogue...
IR35 Status:
Inside IR35

CV-Library Stevenage, Hertfordshire Contractor
CL
Dec 17, 2025  
OT Security Engineer
Rullion are looking to recruit for the following role for one of our global leading Energy clients. OT Security Engineer Location - Warwick- Hybrid - 1 day per week - Commute to Lincoln once a month ASAP Start 6-12 Months then rolling contract (long term work) Inside IR35 PAYE £(Apply online only) Per day Umbrella £(Apply online only) Per day Position Main Responsibilities: Report to the Lead Execution Manager for Industrial Cyber Security. Hands-on support the Digital Products and Solutions team in achieving goals and setting cyber security strategy. Assist in the delivery of cybersecurity projects by validating existing technical documentation. Hands-on work in OT environments, including configuring networks, remote access solutions, and virtualization platforms. Provide customer cyber support and act as a point of contact for execution projects. Answer technical questions from Product Lines, including troubleshooting and solution listing. Write and perform training sessions...
IR35 Status:
Inside IR35

CV-Library Warwickshire, UK Contractor
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