Principal Mechanical Engineer (Water)

Company: Sweco UK Ltd
Apply for the Principal Mechanical Engineer (Water)
Location: Peterborough
Job Description:

As a Principal Mechanical Engineer, you’ll be at the forefront of designing and delivering innovative water solutions. You’ll lead technical delivery, drive sustainable and cost‑effective design decisions, and guide junior engineers to deliver work that’s safe, future‑proof, and built to last.

What You’ll Be Doing

  • Lead and review mechanical designs to ensure compliance, safety, and performance excellence.
  • Collaborate with stakeholders to deliver projects on time, within budget, and to high quality standards.
  • Promote the use of digital tools and modular construction techniques.
  • Drive Health & Safety by design, identifying improvements and reducing whole‑life costs.
  • Champion sustainability, carbon reduction, and innovation across the design lifecycle.
  • Mentor junior engineers and create a culture of technical excellence and continuous learning.
  • Work closely with project and engineering leaders, contributing to strategic decisions.

About You

  • A degree in Mechanical Engineering (or related discipline).
  • Preferably chartered, or working towards chartered status.
  • Proven experience in mechanical design—ideally in the water sector or similar complex infrastructure environment.
  • Strong understanding of industry standards, health and safety legislation, and construction principles.
  • Leadership experience with a passion for coaching, mentoring and developing others.
  • Proficiency in CAD and engineering software.
  • Confident decision‑maker, with a collaborative mindset and strong communication skills.

If you believe you have the skill set required, are keen to join a business with genuine opportunities for career progression, then we’d love to hear from you.

Employee Benefits

  • Flexible and hybrid working (Flexworks Policy)
  • Competitive pension contribution
  • Life Assurance
  • Private Medical Insurance
  • Company car or car allowance
  • Discretionary Annual Bonus Scheme
  • Payment of two relevant professional subscriptions
  • 25 days holiday plus bank holidays (with the option to purchase up to 5 additional days per year)
  • Cycle2Work Scheme
  • Employee Assistance Programme (wellbeing, mental health, financial and work advice)
  • Employee discounts via Sweco Benefit Select (Faircare)
  • Salary Sacrifice Electric Vehicle Scheme
  • We plant a tree for all new starters!

Equality, Diversity & Inclusion

It’s important to us that all our colleagues thrive at work – we strive to have a friendly and inclusive culture which respects the contribution individuals can bring to Sweco. We aim to promote equality, inclusivity and diversity for everyone.

Here at Sweco we positively encourage applications from suitably qualified and eligible candidates regardless of sex, race, disability, age, sexual orientation, gender reassignment, religion or belief, marital status, pregnancy or maternity/paternity.

We have signed the Armed Forces Covenant to ensure those who serve or have served, and their families, are treated fairly. To find out more The Armed Forces Covenant – Our Commitments | Sweco UK.

We are an accredited Real Living Wage Employer which reflects our commitment to fair pay and support for all colleagues.

We are also proud to be a Disability Confident Committed employer, and will interview applicants covered by the Equality Act 2010 that opt into the guaranteed interview scheme on the application form and meet the minimum criteria for the role.

If I have a disability, can I get help (e.g. ‘reasonable adjustments’) with the application process?

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Posted: June 15th, 2026