Senior Principal Mechanical Engineer Job at ASSYSTEM (Warrington)

Senior Principal Mechanical Engineer

Join the Fusion and Modular Nuclear Business Unit! Take on a pivotal role in sha...

Location

United Kingdom , Newcastle upon Tyne

Salary:

Not provided

ASSYSTEM

Expiration Date

Until further notice

Requirements

FEED to Detailed Design Experience
Multi-Disciplinary Team Leadership
Steam Cycle Modelling Oversight
Project Budget & Lifecycle Planning
Cooling Water Equipment Expertise
Regulatory & Compliance Knowledge
Requirements Capture Experience
Systems Engineering Awareness
Subcontractor Management
Chartered Engineer (CEng)

Job Responsibility

Leadership of the Engineering Activities of the Cooling Water Team
Development of Safety and Functional Requirements
Design Package Production in Line with Requirements
Management of Interfaces
Preparation of Technical Specifications
Maintain Equipment Lists and Schedules
Management of Risk and Opportunity

What we offer

Attractive social benefits, including an engaging Employee Committee and holiday bonuses
Ongoing training with numerous career opportunities
70% of our managers are promoted internally
Hybrid work: 1-2 days remote per week

Fulltime

Senior Principal Mechanical Engineer

Join the Fusion and Modular Nuclear Business Unit! Take on a pivotal role in sha...

Location

United Kingdom , Derby

Salary:

Not provided

ASSYSTEM

Expiration Date

Until further notice

Requirements

FEED to Detailed Design Experience – Proven expertise in leading projects from Front-End Engineering Design through to execution
Multi-Disciplinary Team Leadership – Skilled in managing and coordinating diverse engineering teams
Steam Cycle Modelling Oversight – Ability to define modelling outcomes and ensure accurate implementation
Project Budget & Lifecycle Planning – Experienced in budgeting and planning for full design lifecycles
Cooling Water Equipment Expertise – Strong track record in designing and optimizing cooling water systems
Regulatory & Compliance Knowledge – Well-versed in ONR, Environment Agency, and HSE regulations
Requirements Capture Experience – Skilled in gathering and defining technical requirements
Systems Engineering Awareness – Strong understanding of integrated design principles
Subcontractor Management – Experienced in overseeing and coordinating subcontractors
Chartered Engineer (CEng) – Professional accreditation in a relevant discipline

Job Responsibility

Leadership of the Engineering Activities of the Cooling Water Team – Lead and mentor a team of engineers, driving technical excellence, innovation, and collaboration to deliver critical cooling water systems for the Small Modular Reactor (SMR) program
Development of Safety and Functional Requirements – Define and establish rigorous safety and performance criteria, ensuring compliance with industry regulations and best practices to support safe and reliable reactor operation
Design Package Production in Line with Requirements – Oversee the creation of comprehensive design packages, ensuring alignment with project specifications, technical standards, and operational needs
Management of Interfaces – Coordinate effectively between engineering teams, suppliers, and stakeholders to ensure seamless integration of cooling water systems with other reactor components
Preparation of Technical Specifications – Develop clear, detailed technical specifications to guide procurement, fabrication, and installation of key cooling water system components
Maintain Equipment Lists and Schedules – Track, update, and manage critical equipment inventories and project schedules to ensure timely delivery and smooth execution of engineering activities
Management of Risk and Opportunity – Proactively identify potential risks and opportunities, implementing strategies to mitigate challenges and optimize system performance, cost-effectiveness, and overall project success

What we offer

Attractive social benefits, including an engaging Employee Committee and holiday bonuses
Ongoing training with numerous career opportunities
70% of our managers are promoted internally
Hybrid work: 1-2 days remote per week

Fulltime

Senior Principal Mechanical Engineer

Assystem has an exciting opportunity for a Senior Principal Mechanical Engineer ...

Location

United Kingdom , Bolton

Salary:

Not provided

ASSYSTEM

Expiration Date

Until further notice

Requirements

Multi-Disciplinary Team Leadership – Skilled in managing and coordinating diverse engineering teams
Steam Cycle Modelling Oversight – Ability to define modelling outcomes and ensure accurate implementation
Project Budget & Lifecycle Planning – Experienced in budgeting and planning for full design lifecycles
Cooling Water Equipment Expertise – Strong track record in designing and optimizing cooling water systems
Regulatory & Compliance Knowledge – Well-versed in ONR, Environment Agency, and HSE regulations
Requirements Capture Experience – Skilled in gathering and defining technical requirements
Systems Engineering Awareness – Strong understanding of integrated design principles
Subcontractor Management – Experienced in overseeing and coordinating subcontractors
Chartered Engineer (CEng) – Professional accreditation in a relevant discipline
Security Clearance Eligibility – Capable of obtaining SC clearance for secure projects

Job Responsibility

Lead and support the development of designs for the following systems: Personnel Airlocks, Main Equipment Access Hatch, Fuel Transfer Channel, Piping Penetrations, Electrical Penetrations, Specialist Nuclear Doors
Conduct DFMEA (Design Failure Mode and Effects Analysis) to identify and mitigate potential failure modes early in the design process
Perform HAZID (Hazard Identification Study) to assess and document risks across the system
Complete and maintain Human Factors Checklists to ensure ergonomics and usability are considered in design decisions
Update and manage the project’s Risk Register to track, evaluate, and mitigate emerging risks
Design Package Production in Line with Requirements – Oversee the creation of comprehensive design packages, ensuring alignment with project specifications, technical standards, and operational needs
Management of Interfaces – Coordinate effectively between engineering teams, suppliers, and stakeholders to ensure seamless integration of cooling water systems with other reactor components
Preparation of Technical Specifications – Develop clear, detailed technical specifications to guide procurement, fabrication, and installation of key cooling water system components
Collaborate with cross-functional teams, including both new and existing FTEs and secondees across engineering and project functions

What we offer

Over 55 years in nuclear engineering
Ranked among the top 3 largest nuclear engineering companies
Attractive social benefits, including an engaging Employee Committee and holiday bonuses
Ongoing training with numerous career opportunities
70% of our managers are promoted internally
Hybrid work: 1-2 days remote per week

Fulltime

EC&I Designer, Engineer, Senior Engineer, Principal Engineer

Step into a career-defining role with Actemium Design, specialists in engineerin...

Location

United Kingdom , Chorley and Whitehaven

Salary:

Not provided

VINCI Energies

Expiration Date

Until further notice

Requirements

Relevant engineering degree (e.g., electrical, electronic, control, instrumentation), HNC/HND, or equivalent professional experience in EC&I design/engineering
Solid understanding of CAD design, industrial electrical systems, instrumentation, and controls design
Experience producing and reviewing EC&I schematics, wiring diagrams, loop drawings, cable schedules, and panel layouts
Proficiency in relevant software (e.g., AutoCAD, EPLAN, Amtech/Trimble, or similar tools)
Knowledge of UK electrical standards and good practice
Proactive, organised, and adaptable approach with strong teamwork and communication skills
For senior/principal roles: proven ability to lead projects, mentor others, and act as technical authority on EC&I design solutions
Full UK driving licence or ability to travel to client sites as required

Job Responsibility

Develop, review, and improve Electrical, Control & Instrumentation (EC&I) designs for nuclear and non-nuclear projects
Carry out detailed engineering calculations, equipment sizing, instrument selection, and preparation of technical documentation (drawings, schedules, data sheets, specifications)
Collaborate with multi-disciplinary teams (mechanical, process, project management) to ensure seamless integration and delivery
Engage with clients, and site teams to clarify requirements, resolve technical queries, and drive engineering excellence
Mentor and support junior engineers/designers, championing knowledge-sharing and continuous improvement

What we offer

Competitive salary package depending on role and experience
Pension contributions
Discretionary annual bonus
Heath Shield plan
26 days holiday plus bank holidays
EV car scheme
Company share scheme (qualifying periods apply)
Death in service insurance
Hybrid and flexible working arrangements where applicable
Supported training

Fulltime

Senior / Principal Mechanical Engineer

ACTEMIUM Design offers multidiscipline design expertise which enables us to deli...

Location

United Kingdom , Chorley

Salary:

Not provided

VINCI Energies

Expiration Date

Until further notice

Requirements

Questioning attitude, confident to challenge information where needed
Previous experience in design substantiation and safety case involvement for highly regulated industries
Fully familiar with all aspects of safety case methodologies and legal framework relevant to nuclear safety
Good oral and written communication skills, including presentation and report writing
Several years' experience working in design engineering
Degree with honours or Level 6 equivalent
Chartered Engineer or equivalent (or working towards)

Job Responsibility

Authoring nuclear substantiation documentation, including Design Substantiation Reports (DSR) providing the assurance and evidence to enable confidence in our technical solutions
Reviewing safety case documentation and identifying potential shortfalls in the design
Liaising with both internal and external designers and equipment vendors to gather information
Interrogating the Engineering Schedule and evidencing claims made against Systems, Structures, and Components (SSC) in the documentation
Interfacing with other stakeholders such as Human Factors, Fire Safety, Criticality, Radiological and the client Technical Authority

What we offer

Competitive salary package
Innovative, collaborative and inclusive environment
Flexible working including hybrid and core hours patterns
Professional and skills based continued development though training and mentoring
Professional Membership fees
Employee share scheme
EV salary sacrifice scheme
Health Shield Cover
Modern offices with on-site gym, café (Chorley Head office)
Social events, charity fundraising events throughout the year

Fulltime

Mechanical Engineer (Senior or Principal)

We are looking for an experienced Senior or Principal Mechanical Engineer with s...

Location

United States , Plymouth

Salary:

Not provided

Uni-Systems Engineering

Expiration Date

Until further notice

Requirements

Must qualify as a U.S. person under ITAR due to access to export-controlled technical data
B.S. degree in Mechanical or Aerospace Engineering from an ABET-accredited school, with 5+ years of experience for Senior level and 7+ years for Principal level
Managed risks associated with custom designs
Collaborated with clients' input to innovate and creatively solve multifaceted problems
Knowledge of current codes and requirements that apply to the Mechanical Engineering discipline
Advanced understanding of engineering software including modeling and analysis
most advantageous being SolidWorks, Solidworks Simulation, MathCAD, Ansys, GD&T
Desire to solve mechanical problems including everything from bearings to actuator sizing with a system level focus
Proficient at using analysis software
Independently determines and develops approach to solutions and work under general direction

Job Responsibility

Design of complex machinery including gearing, actuators, wheels, weldments, bearings, and related assemblies
Contribute to development of concepts and engineering designs, producing engineering calculations as required for projects and design development of systems
Serve as Project Engineer for various projects, overseeing all aspects of design and implementation
Maintain regular communication with clients to ensure project objectives and expectations are met
Develop and manage design budget and schedules, ensuring timely and cost-effective project completion
Lead and coordinate the design team to meet project goals, deadlines and deliverables
Participate in scheduled design reviews with contractors, architects, engineering consultants, and other project team members to ensure alignment and resolve issues
Interface with other departments to coordinate structural systems with electrical and mechanical systems
Provide project status updates during Project Review Meetings and other company meetings
Coordinate with field personnel and purchasing to determine and obtain required components

What we offer

Competitive salary and growth opportunities
Comprehensive benefits package including medical, dental, vision, life, and disability insurance
401(k) plan with above-market company matching
Generous paid time off (PTO) and paid company holidays
HSA and FSA options
A collaborative culture built on integrity, respect, innovation, value and enterprise

Fulltime

Mechanical Engineer - Water / Wastewater (Senior / Principal)

Egis is expanding rapidly in the UK, backed by a global team of more than 20,500...

Location

United Kingdom , Manchester

Salary:

Not provided

Egis in the UK

Expiration Date

Until further notice

Requirements

BEng/MEng (or equivalent) in Mechanical Engineering
Registered as a chartered engineer (CEng) or equivalent professional membership (e.g., IMechE or similar)
Strong track record in the UK regulated water market, focused on municipal water and/or wastewater treatment
Demonstrated leadership across the design lifecycle: feasibility/optioneering, concept, outline and detailed design, plus support through delivery stages as the designer
Practical depth in treatment mechanical engineering: selecting and specifying equipment, integrating packaged plant, and producing/reviewing high-quality design documentation
Working knowledge of UK water industry standards, regulatory expectations, and safety-by-design/CDM as applied to treatment facilities
Experience supporting projects delivered via frameworks, alliances and/or D&B models, including design review, technical query response, and design assurance
Confident client and stakeholder manager
clear communicator, comfortable presenting, and able to lead technical conversations with credibility
Evidence of BD/work-winning contribution (or strong demonstrable aptitude): opportunity shaping, bid inputs, client development, and service-line growth

Job Responsibility

Lead the mechanical design of municipal water and wastewater treatment projects across the UK, covering feasibility, optioneering, concept, outline and detailed design across major programmes (e.g. AMP8, WINEP, SROs, etc)
Set and uphold the mechanical design approach for treatment work: in-house standards (in line with water industry asset standards), checking, and consistency of outputs across projects and teams
Fulfil Designer duties under CDM 2015 for mechanical works, ensuring effective hazard identification and risk reduction and, where designated, supporting or undertaking Principal Designer responsibilities on assigned projects
Take ownership of the mechanical scope within multidisciplinary delivery, driving clear decisions on operability, maintainability, access, and whole-life performance
Produce and quality-check core mechanical outputs such as equipment selection, specifications, datasheets, calculations, schedules, and design narratives (e.g., pumping and packaged plant where relevant)
Act as a senior client-facing technical lead, running workshops and design reviews, advising clients, and building long-term relationships with regulated water stakeholders
Provide design assurance and technical support during delivery phases, including reviewing contractor submissions, answering design queries, and supporting handover/commissioning activities when required
Grow the mechanical capability through business development and work winning: identify opportunities, shape scopes, contribute to bids, and build a healthy forward pipeline
Help translate the UK water growth strategy into practical actions: target sectors, priority accounts, capability gaps, and delivery plans focused on treatment
Build the mechanical arm of the UK water consultancy team through recruitment, mentoring and skills development, including pathways, coaching and technical governance

What we offer

An exciting new growth role in a fast‑organic growing UK business, offering clear and accelerated career progression
Top Employers 2025 certification
A global leader in green infrastructure
Highly competitive leadership‑level reward package
Hybrid and flexible working
26+ days annual leave plus bank holidays
Professional development, chartership support & global mobility
Supportive, inclusive culture driven by sustainability and long‑term community impact

Fulltime

Mechanical Engineer - Water / Wastewater (Senior / Principal)

As our Mechanical Engineering Lead, you’ll take a national leadership position s...

Location

United Kingdom , Bristol

Salary:

Not provided

Egis in the UK

Expiration Date

Until further notice

Requirements

BEng/MEng (or equivalent) in Mechanical Engineering
Registered as a chartered engineer (CEng) or equivalent professional membership (e.g., IMechE or similar)
Strong track record in the UK regulated water market, focused on municipal water and/or wastewater treatment
Demonstrated leadership across the design lifecycle: feasibility/optioneering, concept, outline and detailed design, plus support through delivery stages as the designer
Practical depth in treatment mechanical engineering: selecting and specifying equipment, integrating packaged plant, and producing/reviewing high-quality design documentation
Working knowledge of UK water industry standards, regulatory expectations, and safety-by-design/CDM as applied to treatment facilities
Experience supporting projects delivered via frameworks, alliances and/or D&B models, including design review, technical query response, and design assurance
Confident client and stakeholder manager
clear communicator, comfortable presenting, and able to lead technical conversations with credibility
Evidence of BD/work-winning contribution (or strong demonstrable aptitude): opportunity shaping, bid inputs, client development, and service-line growth

Job Responsibility

Lead the mechanical design of municipal water and wastewater treatment projects across the UK, covering feasibility, optioneering, concept, outline and detailed design across major programmes (e.g. AMP8, WINEP, SROs, etc)
Set and uphold the mechanical design approach for treatment work: in-house standards (in line with water industry asset standards), checking, and consistency of outputs across projects and teams
Fulfil Designer duties under CDM 2015 for mechanical works, ensuring effective hazard identification and risk reduction and, where designated, supporting or undertaking Principal Designer responsibilities on assigned projects
Take ownership of the mechanical scope within multidisciplinary delivery, driving clear decisions on operability, maintainability, access, and whole-life performance
Produce and quality-check core mechanical outputs such as equipment selection, specifications, datasheets, calculations, schedules, and design narratives (e.g., pumping and packaged plant where relevant)
Act as a senior client-facing technical lead, running workshops and design reviews, advising clients, and building long-term relationships with regulated water stakeholders
Provide design assurance and technical support during delivery phases, including reviewing contractor submissions, answering design queries, and supporting handover/commissioning activities when required
Grow the mechanical capability through business development and work winning: identify opportunities, shape scopes, contribute to bids, and build a healthy forward pipeline
Help translate the UK water growth strategy into practical actions: target sectors, priority accounts, capability gaps, and delivery plans focused on treatment
Build the mechanical arm of the UK water consultancy team through recruitment, mentoring and skills development, including pathways, coaching and technical governance

What we offer

Hybrid and flexible working
26+ days annual leave plus bank holidays
Professional development, chartership support & global mobility
Supportive, inclusive culture driven by sustainability and long‑term community impact

Fulltime

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Senior Principal Mechanical Engineer

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