Principal Environmental Specialist

At Amentum, we're not just solving problems; we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. If you're passionate about making a real impact and want to be part of a community that values ethical excellence, this is the place where your ambition can thrive.

Here, we believe that success comes from continuously pushing boundaries and working together to deliver on our promises. We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all.

We’ll inspire and empower you to deliver your best work so you can evolve, grow and succeed – today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive team who always strive to do the right thing for our people, clients and communities.

People are our greatest asset, and we offer a competitive package to retain and attract the best talent.

In addition to the benefits you’d expect, UK employees also receive free single medical cover and digital GP service, family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships.

Work-life balance and flexibility is a key focus area for us. We’re happy to discuss hybrid, part‑time and flexible working hours, patterns and locations to suit you and our business.

Amentum provides client‑oriented solutions across our environment, energy, and defence businesses. With a strong order book and a diverse, exciting portfolio of projects across the UK and internationally, we need to expand our team of environmental specialists across multiple disciplines required to deliver a project lifecycle—from new build and operations through to decommissioning and site end use. We offer opportunities for significant career advancement, attractive remuneration, and flexible working, as well as leadership and client relationship role development.

We are seeking a Principal/Senior Consultant with environmental permitting expertise to join our expanding team. In this client‑facing role, you will develop and manage best available technique (BAT) methodologies to quantify and mitigate risks associated with nuclear waste management and new build nuclear infrastructure. We welcome candidates from both consultancy and regulatory backgrounds, especially those with experience as a statutory peer reviewer in environmental permitting.

This role can be based in Harwell, Cumbria or Birchwood.

• Technical Leadership:
  Lead, manage, and deliver environmental permit applications/authorisations focused on air quality, water quality, materials management, and waste management.

• Best Available Techniques:
  Develop methodologies that consider climate resilience, emissions, noise, biodiversity, water discharges, and heritage—adopting cutting‑edge approaches to environmental assessments.

• Nuclear Focus:
  Serve as the discipline lead for environmental permitting in nuclear waste management, guiding project teams to meet technical and regulatory requirements.

• Stakeholder Engagement:
  Communicate impacts, mitigation measures, and outcomes to clients, regulators, and other stakeholders. Facilitate both technical and non‑technical meetings, including public consultations and client workshops.

• Project & Business Contribution:
  Manage and deliver inputs into safety cases, competition bids, permit variations, and planning applications. Evaluate risks and opportunities related to permitting, offering strategic insights to project stakeholders.

Below are the qualifications and experience that we’re seeking in applicants. We understand that not everyone will meet every single requirement, so if you believe you have most of the relevant experience and strong potential to succeed in this role, we’d love to hear from you.

• Environmental Permitting:
  Minimum five years’ experience leading the preparation of environmental permit applications…