147 senior mechanical engineer jobs found

Company Description Assystem is an international company with one mission: accelerate the energy transition around the world. Every day, our 8,000 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy. We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition. Drawing on more than 55 years' experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimize the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked second in the world for nuclear engineering. To ensure a viable, efficient, and reliable energy...

Are you a senior Mechanical Engineer in Building Service Design and looking to work on some exciting projects? Do you want a contract role with variety? You could work for a leading Building Services contractor, with a national presence with the following details; Location: Liverpool (1x a week in the office) Rate: Up to £50 per hour (Inside IR35) Duration: 12 months + Key Responsibilities · Deliver mechanical design for major construction projects · Produce high-quality designs, specifications, and technical solutions · Work closely with clients, architects, and multidisciplinary teams · Coordinate designs across disciplines (M&E, BIM, etc.) · Ensure compliance with regulations, standards, and quality procedures · Support cost planning, estimates, and pre-construction activities · Contribute to innovative and sustainable design solutions · Support and mentor junior engineers where required Requirements · Degree in Mechanical or Building Services Engineering ·...

Senior Mechanical Design Engineer Role - Senior Mechanical Design Engineer Contract - 12 months Rate - £55 per hour inside IR35 Location - Derby 5x per week Are you a Senior Mechanical Design Engineer looking to work on some of the UK's most technically challenging and high-impact engineering programmes? This is an opportunity to join a world-class engineering environment delivering cutting-edge projects across the nuclear and defence sectors. You'll become part of a highly skilled team working on complex systems where innovation, precision, and engineering excellence are at the heart of everything. This role offers the chance to work on technically demanding programmes while mentoring junior engineers and driving innovation across design processes and methodologies. Role Responsibilities Producing high-quality mechanical designs to customer specifications Creating detailed 3D CAD models and manufacturing drawings Supporting product development and design improvement...

An opportunity has arisen for a Senior Engineer - Integration to join the Engineering department on a contract basis. About the role Lead the development of defined technical areas or subsystems within a programme, providing technical expertise and mentoring to junior engineers. What you will do Own delivery of significant work packages or subsystems within a project. Develop and validate engineering designs, ensuring compliance with standards. Mentor and support Engineers within the team. Lead problem-solving and root-cause investigations. Interface with other disciplines to ensure design integration and coherence. Provide input to project planning, scheduling, and risk management. Implement and evolve the Integration Plan; author/update ICDs and interface tests. Lead bring‑up sessions & design reviews. Support readiness reviews (PDR/CDR/PRR) with integration evidence. About you Degree-qualified (or equivalent) engineer with adequate experience. Proven...

Senior Consultant - Engineering Design Location: London - 5 days a week 40 hours per week (hybred 3 days in the office min) Contract: Freelance / Contract / 6 Months + £315 per day Limited company Engineer Innovation From Concept to Manufacture We are working with a leading product innovation consultancy seeking an experienced Senior Consultant for Mechanical Engineering Design, to deliver complex engineering projects from concept through to production in the Medical and consumer product world. This role suits a technically strong, commercially aware engineer with experience leading projects, solving complex design challenges, and managing client relationships. Key Responsibilities Lead client communication and project delivery Interpret briefs, define requirements, and manage plans, budgets, and timelines Develop innovative engineering concepts and assess feasibility Deliver robust designs using 3D CAD, FEA/CFD, mathematical modelling, and prototype testing Support...

Crem Recruitment is recruiting on behalf of its client for a Senior Mechanical Design Engineer to join a growing engineering and manufacturing business based near Newmarket on a 12-month fixed-term contract. This is the kind of role that suits an engineer who enjoys being trusted. Someone who wants ownership, variety and the opportunity to genuinely influence products, projects and manufacturing improvements rather than simply being another cog in a large corporate machine. The business is going through a significant period of growth and investment, with engineering sitting right at the centre of it. Production capability has expanded rapidly, new projects continue to come through the door and the design team now needs an experienced Mechanical Design Engineer who can help lead from the front technically, whilst remaining hands-on day-to-day. You’ll be involved across the full lifecycle, from concept generation and detailed design through to prototyping, testing, production...

Ready to take the lead on a high-profile mechanical engineering project within the UK’s nuclear sector? Do you have a strong background delivering engineering solutions in regulated environments? Are you confident leading design activities while collaborating across multi-disciplinary teams on complex programmes? The Opportunity An exciting contract opportunity has arisen with a leading engineering consultancy supporting a nationally significant nuclear programme. This role offers the chance to work on complex mechanical systems in a highly regulated, safety-critical environment. We would also welcome applications from these industries Defence, oil and gas, power generation, petrochemical, and aerospace sectors. This role would suit candidates working in these roles Senior Mechanical Engineer, Mechanical Design Engineer, Lead Mechanical Engineer, Project Mechanical Engineer, Mechanical Systems Engineer, Principal Mechanical Engineer, Design Engineer, Mechanical...

We have a fantastic opportunity for an experienced Principal Mechanical Engineer to join a specialist engineering business delivering complex projects within the nuclear sector. This role will lead and supervise multidisciplinary engineering design activities, providing technical oversight and ensuring compliant, high-quality engineering solutions are delivered safely and efficiently across the full project lifecycle. This position would suit a senior Mechanical Engineer with a strong nuclear background who enjoys leading technical teams and solving complex engineering challenges. It will appeal to someone with strong calculation experience, a solid understanding of engineering compliance and extensive experience using Autodesk Inventor within regulated engineering environments. Key Responsibilities * Lead and supervise mechanical engineering design teams across complex project delivery activities * Produce and review engineering calculations, design documentation and technical...

The Role We're looking for a Senior Mechanical Engineer to lead the design and delivery of mechanical building services on large, complex construction projects. You'll take ownership from concept through to construction, ensuring designs are practical, compliant, and cost-effective. Location: Liverpool (1x a week in the office) Rate: Up to £55 per hour (Inside IR35) Key Responsibilities ·Lead mechanical design for major construction projects ·Produce high-quality designs, specifications, and technical solutions ·Work closely with clients, architects, and project teams ·Coordinate designs across disciplines (M&E, BIM, etc.) ·Ensure compliance with regulations, standards, and quality procedures ·Support cost planning, estimates, and pre-construction activities ·Drive innovation and sustainable design solutions ·Provide technical guidance and mentor junior engineers Requirements ·Degree in Mechanical or Building Services Engineering ·CIBSE / IMechE member (or...

Contract Senior Marine Engineer (Hydraulics) Command Power. Drive Precision. Keep Marine Systems Moving. Are you ready to take ownership of critical marine hydraulic systems and make a real impact across complex vessels? We are seeking a Contract Senior Marine Engineer (Hydraulics) to lead, optimise, and safeguard the operation of vital onboard systems-ensuring reliability, safety, and peak performance in demanding environments. Duration of the contract will be dependent on the project need and its requirements. What You'll Do Senior Marine Engineer (Hydraulics) will lead technical oversight of hydraulic systems including steering gear, cranes, winches, stabilisers, and deck machinery Diagnose and resolve complex system faults, driving preventative and corrective solutions Act as the technical authority for hydraulic schematics, system upgrades, and modifications Oversee commissioning, testing, and sea trials for new and upgraded systems Ensure performance meets Class,...

Job Title: Senior HV Power Electronics Engineer Contract Duration: 12 Months Location: London Rate: £70–75 p/h DOE (Inside IR35) About the Role We are supporting an advanced engineering programme requiring a Senior HV Power Electronics Engineer with deep expertise in high-voltage system design, insulation coordination, and HV product validation. Key Responsibilities * Lead high-voltage creepage and clearance assessments across HV systems and subsystems. * Support the design and validation of high-voltage power conversion systems and associated power electronics. * Define and review insulation coordination strategies for complex electronic products. * Conduct HV risk analysis, DFMEA activities, and system-level design reviews. * Develop validation methodologies including HV withstand and insulation resistance testing. * Work closely with electrical, mechanical, safety, and systems engineering teams to resolve HV integration challenges. Required Experience *...

Job Title: Assistant Mechanical Engineer / Plumbing Improver (Temp to Perm) Location: Richmond (Primary Site) - with occasional travel to Weybridge Hours: Monday-Friday, 8:00am - 5:00pm Contract: Temporary to Permanent initially paid through Umbrella on £18 - 19 per hour starting salary will be around £28k - £32k About the Role We are recruiting for an Assistant Mechanical Engineer / Plumbing Improver to join a growing team on a newly mobilised site in Richmond. This is an excellent opportunity for someone with hands-on experience in plant rooms, hard services FM, or a commercial maintenance environment who is looking to develop their skills and build a long-term career. This is a temp-to-perm position with a strong likelihood of becoming permanent, offering structured training, mentoring, and upskilling alongside experienced engineers. You will be primarily based in Richmond, with occasional travel to a nearby site in Weybridge. Key Responsibilities Support qualified...

We are currently recruiting for a Junior Project Engineer to support a Northumberland based client. Scope of Work: * Project Engineer will support delivery of a pharmaceutical project involving design, construction and of a packaging hall and warehouse facility * Responsible for delivering defined engineering scopes across both equipment systems and facilities/utilities infrastructure with a focus on mechanical building services and live site tie-ins * Safe execution on a live GMP site * Maintaining compliance with GMP, EHS, regulatory requirements and supporting effective handover to operations Qualifications: * Engineers with projects experience who can own technical workstreams while collaborating with senior engineers and cross functional stakeholders * Degree in an engineering discipline ideally or equivalent experience supporting Capital projects * Proven experience supporting pharmaceutical projects in a GMP regulated environment * Experience with equipment...

12 Month Contract (Inside IR35) Hybrid Working (ideally 3 days per week onsite – can be some flex on this) Job Role: To design and detail efficient landing gear systems for civil and military aircraft to meet demanding customer requirements. To support the design and manufacturing of the landing gear systems across the whole life-cycle. Key Responsibilities: Support all aspects of concept to detail design throughout the life cycle of our landing gear programmes Support all aspects of product configuration Use of up-to-date technology including computer based programmes and systems (CAD, 3D Modelling, 2D Draughting, data management systems) Designing to meet exacting customer requirements and industry standards Technical presentations to customers Interfacing with team members, chief engineers, programme management, manufacturing and colleagues at other sites Working closely with manufacturing to reduce non-conformances on products Liaise with other sites to assist with the...

Senior Quality Assurance Engineer - Teesside - Major Net Zero Programme We are supporting a leading engineering delivery partner working on behalf of bp at the forefront of the UK's net zero transition. This is a unique opportunity to join a landmark programme shaping the future of low-carbon energy across the Teesside and Humber regions. The wider initiative forms part of the East Coast Cluster, one of the UK's most ambitious decarbonisation programmes, supporting carbon capture, hydrogen production, and low-carbon power generation. At peak, the programme is expected to store up to 23 million tonnes of CO₂ per annum by 2035, while enabling new industrial growth and clean energy infrastructure. This role sits within a critical workstream focused on onshore pipelines, HV infrastructure, and associated civil works, supporting major projects including Net Zero Teesside Power and hydrogen development schemes. The Role As a Senior Quality Assurance Engineer, you will play a key...

Commissioning Engineer - Water & Wastewater Surrey & London (with site travel as required) 45 hours per week Overview We are seeking an experienced Commissioning Engineer to join a major main contractor delivering complex water and wastewater process engineering projects. This role is critical to ensuring safe, compliant, and right‑first‑time installation, testing, and commissioning from design through to handover. You will play a leading role across the full commissioning lifecycle, working closely with design teams, suppliers, subcontractors, and client stakeholders to deliver high‑quality outcomes. Key Responsibilities Commissioning & Technical Delivery Provide full lifecycle commissioning input from design through installation, testing, commissioning, and handover. Develop and implement commissioning plans, procedures, and documentation. Undertake hands‑on commissioning activities across electrical, mechanical, and process systems. Lead and witness FAT and...

Commissioning Engineer - Water & Wastewater London (with site travel as required) 45 hours per week Overview We are seeking an experienced Commissioning Engineer to join a major main contractor delivering complex water and wastewater process engineering projects. This role is critical to ensuring safe, compliant, and right‑first‑time installation, testing, and commissioning from design through to handover. You will play a leading role across the full commissioning lifecycle, working closely with design teams, suppliers, subcontractors, and client stakeholders to deliver high‑quality outcomes. Key Responsibilities Commissioning & Technical Delivery Provide full lifecycle commissioning input from design through installation, testing, commissioning, and handover. Develop and implement commissioning plans, procedures, and documentation. Undertake hands‑on commissioning activities across electrical, mechanical, and process systems. Lead and witness FAT and SAT...

Looking for your next move in engineering where you can make a genuine impact? Do you have proven experience delivering technically complex projects within a regulated or high-spec environment? Are you confident working with stakeholders, managing deliverables, and ensuring quality from concept through to completion? The Opportunity An excellent opportunity has arisen to join a well-established engineering consultancy delivering innovative solutions across complex projects. You’ll play a key role in supporting project delivery while contributing technical expertise within a collaborative and forward-thinking team. We would also welcome applications from these industries Nuclear, defence, oil and gas, utilities, rail, manufacturing, and other highly regulated engineering environments. This role would suit candidates working in these roles Mechanical Engineer, Project Engineer, Design Engineer, Senior Engineer, Engineering Consultant, Plant Engineer, Systems Engineer,...

Senior Project Engineer - EC&I (Electrical, Controls & Instrumentation) Malton, North Yorkshire | Hybrid (2 days on-site, 2 days remote) 12‑month contract | Inside IR35 | Rate: Negotiable Our client is seeking an experienced Senior Project Engineer - EC&I, to support the delivery of complex engineering projects within a highly regulated industrial environment. This is a fantastic opportunity for a technically strong engineer to play a key role across the full project lifecycle, contributing to high‑profile, safety‑critical programmes. The role In this role, the Senior Project Engineer / EC&I Engineer, will identify functional requirements and stakeholder needs, manage engineering support to projects and contribute to Project Execution Plans, including design, safety case and commissioning strategies. You will lead concept and detailed design activities, produce and approve technical specifications and oversee contractors' design and construction activities....

Senior Design Engineer About The Role We are seeking an experienced Senior Design Engineer to join a specialist team delivering world-class landing gear systems for civil and military aircraft. You will play a key role across the full product life cycle, from early concept development through to detail design and in-service support, working to demanding customer and industry standards in a highly collaborative engineering environment. Contract Details Location - Cheltenham, UK Duration - 12 months Working Pattern - Hybrid - 3 days from home / 2 days in office Engagement Type - Inside IR35 What You'll Be Doing *Lead and support concept-to-detail design activities across the full life cycle of landing gear programmes, ensuring technical integrity at every stage. *Manage and support all aspects of product configuration, maintaining accurate and controlled documentation throughout. *Apply current design technology, including CATIA V5 3D modelling, 2D draughting, CAD tools and data...