Transform how organisations reach net zero.
Are you ready to take up a vital role in shaping some of our exciting projects? How about joining our talented team, where everyone has a voice, and together we face our clients' problems head-on. It's a diverse and inclusive work environment where world-class talent knows no distinctions.
We know that different people have different priorities, which is why we're here to support you. Flexible and remote working is a central part of our culture. So, talk to us about what's ideal for you – from reduced weeks to buying more leave over school holidays. And if you're returning from a career break, ask us how we can help you transition back into work with us.
Bring your skills to the mix as a Principal Engineer/Technical Authority. You'll play a vital role, collaborating with clients and design teams around the UK. Our Sustainability practice leads the way in innovation, transformation and digital on the path to Net Zero. Lead carbon management and sustainability integration across Aviation, Defence, Energy, Cities & Development, Education, Rail, and Water. We're big on expertise but not on hierarchy. So, we'll trust you with more responsibility faster, supporting your career to the next level.
Your purpose:

• Develop early-stage operational energy strategy models to inform design decisions.
• Collaborate with digital teams to create, test, and deploy in-house modelling tools.
• Conduct advanced IES modelling assessments, including compliance checks (Part L, TM52, TM59, TM54, ASHRAE 90.1), daylighting, and wind studies.
• Lead technical projects, managing resources and producing detailed reports on review and interdisciplinary impacts.
• Act as Project Leader for Building Physics initiatives, ensuring quality and timely delivery.
• Report progress and issues to the Building Physics Lead, maintaining transparency and accountability.
• Engage with AtkinsRéalis Global Technical Centre to enhance project value through international collaboration.
• Stay current with modelling best practices and emerging technologies to improve project outcomes.
• Boost team productivity and quality by implementing processes, training, and software interoperability (e.g., Revit to Dialux, IES).
• Support team development, including mentoring junior staff and expanding modelling expertise across tools like IES-VE, SAP, CFD, Therm, and PHPP.

What you can bring

• Strong technical knowledge of UK and EU standards, Building Regulations (especially Part L), and building services systems.
• Expertise in passive design and energy-efficient solutions, with experience in developing energy strategies and dynamic modelling.
• A degree in mechanical engineering or building physics.
• Proficiency in modelling tools and assessments (e.g., IES-VE, SAP, CFD), with the ability to manage scope and resources effectively.
• Professional memberships (CIBSE, IET, IMechE) and Low Carbon Energy Assessor status are advantageous.
• Strong communication and reporting skills, with high literacy and the ability to author technical reports.
• Team-oriented mindset, with mentoring capabilities and a supportive approach to junior staff development.
• Logical and solution-driven, with a passion for improving building performance and contributing to digital transformation and net zero goals.
• Adaptable and culturally aware, able to work across diverse teams and client environments.
• Security clearance eligibility and UK passport holder, with a confident, professional, and proactive attitude.

Why work for AtkinsRéalis?

We're ranked as one of LinkedIn's Top 25 Companies, where UK professionals want to work and stay once they join. We've also made the Times Top 50 employers for women.
Our Infrastructure team uses innovation, new approaches and the power of data to help our clients deliver end-to-end projects and programmes for essential future infrastructure. And as the work becomes ever more complex, our employees continue to challenge the status quo.
We're committed to engineering better for people and our planet, from our global Engineering Net-Zero programme to creating social value through EDAROTH community housing. We're proud of our active employee networks creating awareness and allyship for our under-represented groups. Not to mention programmes supporting communities outside AtkinsRéalis, including schools, charities, ex-forces and professionals returning after career breaks.
Security clearance:

This role may require security clearance and offers of employment will be dependent on obtaining the relevant level of clearance. If this is necessary, it will be discussed with you at interview. The vetting process is delivered by United Kingdom Security Vetting (UKSV) and may require candidates to provide proof of residency in the UK of 5 years or longer. If applying to this role please do not make reference to (in conversation) or include in your application or CV, details of any current or previously held security clearance.

We are committed to promoting a diverse and inclusive community - a place where we can all be ourselves, thrive and develop. To help embed inclusion for all, from day one, we offer a range of family friendly, inclusive employment policies, flexible working arrangements and employee networks to support staff from different backgrounds. As an Equal Opportunities Employer, we value applications from all backgrounds, cultures and ability.

#LI-INFRASTRUCTURE | #LI-UK

At AtkinsRéalis , we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world-class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.