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Senior Mechanical Engineer

Job in Blackburn, Lancashire, BB1, England, UK
Listing for: Assystem
Full Time position
Listed on 2026-02-25
Job specializations:
  • Engineering
    Systems Engineer, Electrical Engineering
Job Description & How to Apply Below

Assystem Blackburn, England, United Kingdom

Senior Mechanical Engineer

Assystem Blackburn, England, United Kingdom

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Assystem is a global leader committed to accelerating the energy transition. With 7,500 employees across 12 countries, we tackle the monumental task of switching to low-carbon energy. Our 55+ years of experience in highly regulated sectors ensure we deliver top-notch engineering, project management, and digital solutions.

Assystem is a global leader committed to accelerating the energy transition. With 7,500 employees across 12 countries, we tackle the monumental task of switching to low-carbon energy. Our 55+ years of experience in highly regulated sectors ensure we deliver top-notch engineering, project management, and digital solutions.



Job Description

Join the Fusion and Modular Nuclear Business Unit! Reporting to the Balance of Plant Lead, the Senior Mechanical Engineer shall be responsible for developing a fluid system. The Senior Mechanical Engineer shall work closely with multi-disciplined teams and the supply chain to help deliver the system design.

Your mission:

  • Lead Fluid System Development:
    Mana
    ge a small team to develop fluid systems. Re
  • view Design Documents:
    Deve
    lop and review Process Flow Diagrams, Piping and Instrumentation Diagrams, Layout Drawings, Component Sizing Calculations, Datasheets, and Specifications. Co
  • nduct Optioneering:
    Lead
    and review optioneering studies, Decision Record Files, Design Descriptions, and Requirement Specifications. Ap
  • ply Systems Engineering:
    Deve
    lop and review Functional and Design Requirements using Systems Engineering principles.️ In
  • tegrate System Design:
    Ensu
    re the fluid system design integrates seamlessly into the wider power plant. Pr
  • ovide Technical Support:
    Act
    as the technical contact for interfaces and stakeholder activities. Su
  • pport Design Reviews:
    Part
    icipate in Design Reviews and HAZID/HAZOP studies with multidisciplinary teams.️ L
  • iaise on Safety:
    Coll
    aborate with the safety team on nuclear safety licensing, environmental planning/permitting, and related interface activities. En
  • sure Compliance:
    Adhe
    re to statutory H&S policies, project quality, and safety rules.

    Why J

oin the Community of Switchers? Ov

  • er 55 years in nuclear engineering. Ra
  • nked among the top 3 largest nuclear engineering companies. At
  • tractive social benefits, including an engaging Employee Committee and holiday bonuses. On
  • going training with numerous career opportunities. 70
  • % of our managers are promoted internally! Hy
  • brid work: 1-2 days remote per week. Qual

i

fications️ I

  • ndustry

    Experience:

    Back
    ground in nuclear, thermal power, oil and gas, or other highly regulated sectors.

    Flu
  • :
    Expe
    rienced in fluid system design development. De
  • sign Phases:
    Prof
    icient in roles covering FEED to detailed design and EPC delivery. Pr
  • ocurement:
    Skil
    led in developing procurement specifications and collaborating with suppliers.️ Te
  • chnical Expertise:
    Stro
    ng technical background in thermal power or similar projects Co
  • mmunication:
    Exce
    llent communication skills for engaging with stakeholders. Pr
  • oject Management:
    Abil
    ity to identify and manage critical interfaces on major projects.️ Sa
  • fety & Standards:
    Know
    ledgeable in UK Health and Safety regulations, safety systems, HAZOP, and engineering standards. Co
  • des & Standards:
    Fami
    liar with ASME, European, and UK codes and standards. Sy
  • stems Engineering:
    Expe
    rience or awareness in Systems Engineering is a plus. Pers

o

nal Specification/Attributes:
Re

  • sults-Oriented:
    Inde
    pendent, proactive, and results-focused team player. Or
  • ganization:
    Stro
    ng organizational skills, handling confidential nuclear information professionally. Ed
  • ucation:
    Bach
    elor’s degree or Higher National Diploma in engineering. Pr
  • ofessional Registration: CEng in a relevant discipline or working towards it. Se
  • curity Clearance: SC Clearance or ability to achieve it.

    Addit
ional Information Due t

o the nature of the work, applicants must meet UK security clearance criteria.

Ready

to make a difference in the nuclear engineering world? Join us and be a part of the future of nuclear and fusion innovation! We ar

e committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.

Seniority

level
  • Seniority level

    Mid-Senior level
Employment type
  • Employment type

    Full-time
Job function
  • Industries Business Consulting and Services

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Position Requirements
10+ Years work experience
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