Mechanical Engineer / Senior Mechanical Engineer – Contract (Inside IR35)
Warrington (Hybrid – 3 Days Onsite)
£51-£56 per hour
Long-Term Contract | Major Nuclear Programme – PFDO, Sellafield
Are you a Mechanical Engineer ready to step into a high-impact role on one of the UK’s most critical nuclear programmes?
We’re supporting a key delivery partner on the PFDO project at Sellafield, and we’re looking for a Mechanical Engineer or Senior Mechanical Engineer to help drive engineering excellence across complex, safety-critical work.
The Opportunity
You’ll play a vital role in delivering engineering and technical activities across the project lifecycle-bringing your expertise to solve complex challenges and ensure high-quality outputs in a regulated environment.
This is a fantastic opportunity to work on a flagship nuclear programme, collaborating with experienced teams while contributing to the safe and efficient delivery of major works.
What You’ll Be Doing
- Deliver mechanical engineering solutions across design and project phases
- Resolve complex technical issues using your specialist knowledge
- Produce and review technical reports, calculations, and documentation
- Ensure compliance with project specifications and stakeholder requirements
- Support and guide junior engineers within the team
- Build strong relationships with internal and external stakeholders
- Work independently or as part of a multi-disciplinary engineering team
What We’re Looking For
- Proven experience as a Mechanical Engineer or Senior Engineer
- Background in highly regulated industries (ideally nuclear)
- Strong technical problem-solving and analytical skills
- Experience producing and reviewing engineering documentation
- Ability to work autonomously with minimal supervision
- Strong stakeholder engagement and communication skills
Key Details
- Location: Warrington (3 days onsite, hybrid working)
- Rate: £51-£61/hour (Inside IR35)
- Clearance: BPSS minimum (higher clearance beneficial)
- Project: PFDO Programme – Sellafield
Why Apply?
- Be part of a major UK nuclear infrastructure programme
- Long-term contract stability
- High-impact engineering role with real responsibility
- Collaborative, forward-thinking project environment
CE&I Safety System Design Engineer
Silos MSSS SEP 1 & 2 | Nuclear & High-Hazard Environment
Warrington
Hybrid – 3 days on site
£51-£56/hour | Inside IR35
Are you a CE&I Safety System Design Engineer looking to make a real impact on nationally significant infrastructure? This is a high-profile opportunity to join the Silos MSSS SEP 1 & 2 programme, working at the heart of safety-critical design in a complex, regulated environment.
You’ll be part of a specialist CE&I design team, delivering and checking Safety System design packages that underpin safe operations – while also supporting commissioning activities and mentoring the next generation of engineers.
The Role
You’ll play a key role in:
- Delivering and checking CE&I Safety System design packages to meet safety, functional and business requirements
- Supporting and reviewing designs produced by other engineers within the team
- Working across disciplines to ensure compliant, integrated solutions
- Providing technical support to Commissioning activities
- Supporting and developing early-career engineers
This role offers a strong mix of hands-on technical delivery, collaboration, and leadership within a highly respected programme.
What We’re Looking For
Essential
Minimum HNC (or equivalent) in an engineering discipline
Incorporated Engineer status (or working towards)
3+ years’ experience delivering CE&I Safety System design on external multi-discipline projects
Proven experience from concept design through to handover
Working knowledge of relevant engineering standards
Strong verbal and written communication skills
Experience supporting Commissioning activities
A collaborative mindset and willingness to support junior engineers
Desirable
5+ years’ experience delivering CE&I Safety System design on external and/or SL projects
Experience implementing new or modified safety requirements on existing systems
A pragmatic, solutions-focused approach in complex, safety-critical environments
Why Apply?
- Work on a long-term, high-profile nuclear programme
- Competitive £51-£56/hour (Inside IR35)
- Hybrid working with a clear on-site/remote balance
- Be part of a technically strong, supportive engineering team
- Opportunity to influence safety-critical outcomes and mentor others
Senior Mechanical Designer
Location: Warrington (initially 5 days/week in office; occasional site visits or travel to other offices)
£35-41/hour Inside IR35
About the Project
Join the Asset Care Project Delivery team, supporting the Mechanical asset care portfolio, with an initial focus on the WVP Compressor Project. This is a key role delivering high-quality mechanical design solutions that ensure operational safety, compliance, and reliability across a range of critical projects.
Role Overview
As a Senior Mechanical Designer, you will:
- Produce engineering design work packages including specifications, drawings, analyses, verification, and assessments that meet legal, functional, and performance requirements.
- Ensure designs are delivered on time, within cost, and to the agreed quality standards.
- Work closely within a multi-disciplinary design team, collaborating with technical and non-technical stakeholders.
- Contribute to mechanical design of piping systems, machinery, and mechanical handling systems, ensuring compliance with relevant standards and legislation.
- Support the integration of designs into operational facilities, providing clear documentation and advice throughout the project lifecycle.
Essential Experience & Skills
- Experience working in a highly regulated industry, preferably nuclear.
- Proven ability to deliver safe, fit-for-purpose, integrated mechanical designs.
- Qualified and experienced Aveva E3D user.
- Mechanical design expertise in piping systems (ASME B31.3, PER, PSSR) and machinery/mechanical handling (Supply of Machinery Regulations, LOLER, PUWER).
- Producing design deliverables such as technical reports, drawings/layouts, installation method statements, and risk assessments.
- Familiarity with British and ISO Standards.
- Ability to liaise with stakeholders across all levels and disciplines.
- Experience in multi-disciplinary, integrated design teams.
Essential Qualifications
- Degree in Mechanical Engineering (minimum 2 years’ design delivery experience) OR HNC/HND with 5+ years design delivery experience.
- Training/qualifications in AutoCAD, Autodesk Inventor, and Autodesk Vault.
Desirable Experience
- Experience in an asset care delivery function on operational facilities, supporting implementation during construction, installation, or commissioning.
- Familiarity with Sellafield Practices, Processes, Engineering Standards, and Engineering Guides.
- Experience responding to Engineering Queries (EQs) and Fault Observations (FOs).
This is a fantastic opportunity for an experienced mechanical designer to work on high-profile asset care projects within a regulated, nuclear environment, contributing to safe and operable mechanical solutions across multiple projects.
Senior EC&I Designer – Sellafield Ponds Programme
Contract | £51-£56/hour (Inside IR35)
Warrington | Hybrid – 3 days on site / 2 days remote
Sector: Nuclear Decommissioning | Sellafield Ponds
We are seeking an experienced Senior EC&I Designer to support major engineering works within the Sellafield Ponds Programme, one of the most complex and high-hazard decommissioning challenges in the UK nuclear sector.
This role will see you taking a senior position within the EC&I design team, leading the development, review, and delivery of high-integrity design packages for safety-critical systems. You will play a key role in ensuring designs meet strict nuclear safety, regulatory, and engineering standards while supporting project delivery across multidisciplinary teams.
Working within a collaborative engineering environment, you will provide technical guidance to designers and engineers, contribute to design reviews, and ensure the production of high-quality EC&I design documentation.
Key Responsibilities
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Lead the development and delivery of EC&I design packages supporting Sellafield Ponds projects
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Produce, review, and check drawings, schematics, and technical documentation for safety-critical systems
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Ensure all design outputs comply with Sellafield procedures, nuclear safety standards, and regulatory requirements
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Support and contribute to design reviews, hazard studies, and technical assurance activities
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Collaborate with multi-disciplinary teams including mechanical, structural, and project engineering
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Provide technical leadership and mentorship to junior and mid-level EC&I designers
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Assist in the verification, validation, and substantiation of engineering designs
Requirements
-
Significant experience as an EC&I Designer within the nuclear sector or other highly regulated industries
-
Strong understanding of electrical, control, and instrumentation design principles
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Proven experience producing and checking engineering drawings, design documentation, and technical deliverables
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Familiarity with Sellafield standards, processes, and design assurance requirements
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Ability to support technical leadership and mentoring within a design team
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SC clearance preferred, or the ability to obtain
Why Join?
-
£51-£56/hour (Inside IR35)
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Hybrid working – 3 days in Warrington, 2 days remote
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Opportunity to work on the Sellafield Ponds Programme, a nationally significant nuclear decommissioning project
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Join a highly experienced engineering team working in a complex, safety-critical environment
Apply now to bring your senior EC&I design expertise to one of the UK’s most important nuclear decommissioning programmes.
Senior CE&I Engineer – Sellafield Projects
Contract | £51-£56/hour (Inside IR35)
Warrington | Hybrid – 3 days on site / 2 days remote
Are you a Senior Control, Electrical & Instrumentation Engineer looking to apply your expertise within one of the UK’s most complex nuclear environments? We are seeking a Senior CE&I Engineer to support a range of engineering and decommissioning projects across the Sellafield programme, delivering robust CE&I design and safety documentation within a highly regulated setting.
This role offers the opportunity to contribute to nationally significant nuclear decommissioning work, supporting the delivery of safety-critical systems that underpin long-term hazard reduction at Sellafield.
Key Responsibilities
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Deliver CE&I design work packages across a variety of nuclear engineering and decommissioning projects
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Produce and check design substantiation, safety documentation, and technical deliverables
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Provide expert CE&I input into design justification and safety case documentation
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Develop and review functional safety deliverables in line with IEC 61508 (up to SIL 1)
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Resolve complex technical issues using safe, compliant, and pragmatic engineering solutions
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Support installation, commissioning, and documentation activities where required
What We’re Looking For
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CEng or IEng preferred, or equivalent experience
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Strong background in CE&I design within nuclear or other highly regulated industries
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Demonstrated experience delivering fit-for-purpose engineering solutions to time and budget
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Solid understanding of functional safety, SIL-rated systems, and safety case development
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Ability to communicate complex technical issues and solutions clearly to stakeholders
Technical Knowledge & Standards
Experience or familiarity with:
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CE&I regulations and standards including CDM, PUWER, BS EN 13849 / 62061, BS 7671
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Industrial installation standards, UKCA / CE marking
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Engineering drawings, calculations, and design documentation
Desirable Skills
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Design risk assessments, installation method statements, and engineering output packs
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Panel build documentation, technical files, and O&M manuals
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Experience with PLC / SCADA control systems and industrial network architectures
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A pragmatic, risk-based engineering approach grounded in sound judgement
Why Join?
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£51-£56/hour (Inside IR35)
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Hybrid working model – 3 days in Warrington
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Opportunity to work across major Sellafield engineering and decommissioning programmes
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Technically challenging safety-critical work with genuine national importance
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Join a highly experienced and collaborative CE&I engineering team
Apply now to play a key role in delivering safe, effective engineering solutions across some of the UK’s most important nuclear projects.
Senior Revit Designer – Civil, Structural & Architectural (CS&A)
Contract | £36-£41/hour (Inside IR35)
Warrington | Hybrid – 3 days per week in the office
Security: Sellafield experience and existing PP Pass is essential.
We are seeking an experienced Autodesk Revit Designer to support engineering design delivery within a highly regulated environment. This role will focus on the development and modification of Civil, Structural & Architectural (CS&A) and mechanical piping elements within a Revit model, supporting asset care and infrastructure upgrades.
Working within a multi-disciplinary engineering team, you will contribute to the production of design deliverables including drawings, layouts, and engineering documentation, ensuring solutions are safe, compliant, and delivered to agreed time, cost, and quality targets.
The role is primarily office-based in Warrington (3 days per week) with occasional site visits and travel to other offices when required.
Key Responsibilities
- Develop and modify Autodesk Revit models covering CS&A structures and mechanical piping elements
- Update and produce layout drawings and piping isometrics within the design model
- Produce engineering design work packages including drawings, specifications, and technical documentation
- Ensure designs meet legal, functional, and performance requirements within a regulated environment
- Work closely with CS&A and Mechanical Lead Engineers to develop integrated design solutions
- Support the preparation of technical reports, installation method statements, and risk assessments
- Collaborate with multi-disciplinary engineering teams and stakeholders
Requirements
- Proven experience using Autodesk Revit within engineering or construction design environments
- Experience delivering design solutions within a highly regulated industry (nuclear experience preferred)
- Ability to produce technical drawings, layouts, and engineering design documentation
- Experience working within multi-disciplinary design teams
Technical Knowledge
Experience or familiarity with:
- Steelwork design and detailing (Eurocode 3, BS5950-1)
- Mechanical piping design standards such as ASME B31.3, PER and PSSR (desirable)
- British and ISO standards relevant to engineering design
- Development of engineering drawings, reports, and installation documentation
Qualifications
- HNC / HND in Civil Engineering or similar with 5+ years design delivery experience
OR
- Degree in Civil Engineering (BEng / MEng) with at least 2 years design delivery experience
- Evidence of formal training in Autodesk Revit
Security
- SC Clearance preferred
- Candidates can start with BPSS clearance while SC is in progress
Why Join?
- £36-£41/hour (Inside IR35)
- Hybrid working – 3 days per week in Warrington
- Opportunity to work within a complex, safety-critical engineering environment
- Join a collaborative, multi-disciplinary design team delivering high-quality engineering solutions
Apply now if you’re an experienced Revit Designer looking to contribute to technically challenging engineering projects within a highly regulated sector.
Process/Senior Process Instrument Design Engineer- Nuclear (Contract)
Warrington (Hybrid – 3 days on site)
£46-£51/hour (Inside IR35) | Up to £56/hour for Senior Candidates
37 hours over 4½ days per week
We’re supporting a key nuclear programme and are looking for a Process Instrument Design Engineer to join the Silos PFCS Supporting Projects E&I design team. This is a fantastic opportunity to work on high-profile, safety-critical projects where your expertise will directly contribute to complex engineering solutions.
The Role
You’ll be responsible for delivering and checking high-quality design packages, ensuring they meet safety, functional, and business requirements across the project lifecycle.
You will:
- Deliver process instrumentation design from concept through to handover
- Support and collaborate with multidisciplinary engineering teams
- Review and check design documentation
- Provide technical support to construction and commissioning activities
- Mentor and support early career engineers
Essential Requirements
- HND (or equivalent) in a relevant engineering discipline
- Incorporated Engineer (or working towards)
- Active SC Clearance
- Minimum 3 years’ experience as a Process Instrument Design Engineer on multidisciplinary projects
- Strong understanding of engineering standards
- Excellent communication skills (written & verbal)
- Experience supporting both construction and commissioning phases
Desirable Experience
- 5+ years in Instrument & Safety Design Engineering
- Experience across nuclear or similarly regulated environments (nuclear experience is essential overall)
- Knowledge of:
- Process Instrumentation
- Radiometric & Special Instruments
- Safety Systems
- Familiarity with site-specific engineering standards
Why Apply?
- Work on a major nuclear programme with long-term potential
- Hybrid flexibility with a strong team environment
- Will considor senior-level rate (£56/hour)
- Be part of a team delivering critical infrastructure safely and efficiently
