Principal Mechanical Engineer jobs in Cardiff – Browse 51 openings on RoboApply Jobs

Principal Mechanical Engineer jobs in Cardiff

Open roles matching “Principal Mechanical Engineer” with location signals for Cardiff. 51 active listings on RoboApply Jobs.

51 jobs found

1 - 20 of 51 Jobs
Apply
companyAECOM logo
Full-time|On-site|Cardiff

Role overview The Principal Mechanical Engineer at AECOM’s Cardiff office plays a key role in managing mechanical engineering projects across a range of sectors. This position involves providing technical leadership, directing project delivery, and making sure all work aligns with both industry standards and client requirements. Main responsibilities Lead mechanical engineering projects from initial concept to final completion Support and mentor a team of engineers, with a focus on developing junior staff Encourage collaboration with professionals from other disciplines to meet project objectives Drive ongoing improvements in engineering practices and project results

Apr 27, 2026
Apply
companyAECOM logo
Full-time|On-site|Cardiff

AECOM is seeking a Principal Mechanical Engineer specializing in the water sector to join our dynamic team in Cardiff. In this pivotal role, you will leverage your extensive expertise in mechanical engineering to design and oversee projects that enhance water infrastructure and contribute to sustainable practices. You will collaborate with multidisciplinary teams to deliver innovative solutions while ensuring compliance with industry standards.

Mar 30, 2026
Apply
companyAECOM logo
Full-time|On-site|Cardiff

Role overview The Associate Director of Mechanical Engineering at AECOM plays a key part in managing complex engineering projects from the earliest concept stages through to final delivery. The position combines direct technical leadership with hands-on involvement in project work, ensuring quality and consistency throughout each phase. What you will do Lead and mentor a team of mechanical engineers, offering guidance and support as projects progress. Oversee the design, execution, and delivery of projects, maintaining high standards at every step. Build and sustain strong working relationships with clients to support project success. Use expertise in mechanical systems to shape engineering solutions and project outcomes. Location This position is based in Cardiff.

Apr 27, 2026
Apply
companyAECOM logo
Full-time|On-site|Cardiff

We are seeking a talented and experienced Principal Structural Engineer specializing in water engineering to join our dynamic team in Cardiff. In this role, you will lead the design and implementation of innovative structural solutions for water infrastructure projects. You will collaborate with multidisciplinary teams to ensure the highest standards of safety and sustainability are met.

Jan 14, 2026
Apply
companyAECOM logo
Full-time|On-site|Cardiff

Join our dynamic team at AECOM as a Mechanical Engineer specializing in water projects! In this role, you will be instrumental in designing and implementing innovative solutions for a variety of water infrastructure projects. Your expertise will contribute to sustainable practices while ensuring compliance with industry standards and regulations. Collaborate with a talented team of professionals and advance your career in a supportive environment.

Mar 30, 2026
Apply
companyMonzo Bank Ltd logo
Full-time|Remote|Cardiff, London or Remote (UK)

Monzo Bank Ltd is seeking a Principal Backend Engineer to drive the design and development of scalable systems for its banking platform. This role plays a key part in shaping the technical direction of Monzo’s backend, ensuring that solutions are reliable and meet high standards of quality. Key responsibilities Lead the design and implementation of backend systems that power Monzo’s platform Establish and uphold coding and architectural standards across engineering teams Mentor engineers and support their growth in delivering maintainable solutions Champion best practices in software development and system design Technical leadership The Principal Backend Engineer will provide guidance to teams, influencing both immediate projects and long-term engineering strategy. Setting high standards and promoting effective practices are central to this position. Location This role is open to candidates based in Cardiff, London, or working remotely within the UK.

Apr 27, 2026
Apply
companyAECOM logo
Full-time|Hybrid|Cardiff

Kickstart your career and elevate your professional journey with us!“Are you prepared to join a dedicated team of hydrologists and influence the future of the Water Industry?”Become a pivotal member of our innovative and interdisciplinary Water Team as a Principal Hydrologist. This role allows you to work from one of our UK or Ireland offices while benefiting from our flexible hybrid working model.As a Principal Hydrologist, your expertise will be instrumental in delivering significant water projects both domestically and internationally. You will spearhead hydrological assessments that guide flood risk management, major infrastructure planning, water resource strategies, and environmental permitting.This senior position entails a blend of technical proficiency, client interaction, project management, and team leadership within an expanding water division.Your responsibilities will include:Leading hydrological assessments to facilitate flood risk evaluations, infrastructure design, catchment strategies, and environmental impact assessments.Providing technical guidance on rainfall-runoff modeling, river flow estimation, climate change considerations, and catchment analysis.Supervising and reviewing hydrological modeling results to ensure quality, precision, and adherence to UK regulatory guidelines.Serving as the technical lead on significant frameworks and multidisciplinary projects spanning the transport, energy, water, and development sectors.Advising clients on flood risk policies, drainage strategies, abstraction licensing, and environmental permitting needs.Mentoring and developing junior hydrologists, promoting technical excellence and knowledge exchange.Supporting business development initiatives, including bid preparation and client relationship management.If you are driven by innovation and eager to transform bold ideas into reality, AECOM invites you to join our team. We are committed to not just constructing infrastructure but also uplifting communities and enhancing lives. Follow our AECOM Water page on LinkedIn to stay informed about the impactful projects we are executing and witness the difference we are making in the industry!Embrace growth with us.Become an integral part of our vibrant Water division, which comprises approximately 600 experts across the UK and Ireland. Collaborate with leading engineers and consultants to deliver a wide range of engaging projects, from small initiatives to substantial undertakings, from inception to completion.At AECOM, you will thrive in an inclusive and progressive environment where your contributions are appreciated. Enjoy a variety of core and personalized benefits tailored to support your future and well-being, suited to your lifestyle. Take advantage of career development opportunities, technical practice networks, AECOM University, volunteer days, and our flexible hybrid working model to ensure a work-life balance that fits your needs.

Mar 3, 2026
Apply
companyAECOM logo
Full-time|On-site|Cardiff

Begin your journey. Flourish with us.“Are you eager to collaborate with a team of flood risk experts and influence the future of the Water Sector?”Our Water division is seeking a dedicated Senior Flood Modeller to become an integral part of our vibrant and expanding Water Business Line. This role offers the opportunity to contribute to high-profile and impactful projects throughout the UK and beyond, all while being at the center of one of the UK’s most ambitious and interconnected engineering hubs.As a senior technical resource, you will play a pivotal role in mentoring our junior team members and actively enhancing our services for local authorities, water companies, and both public and private sector clients.Your responsibilities will include:Creating and validating hydraulic models using software tools such as Flood Modeller, TUFLOW, Mike 11, Mike 21, HEC-RAS, and ICM to support the design of Flood Alleviation Schemes, conduct Flood Risk Assessments, and perform reservoir flood studies.Developing water quality models, which may involve physico-chemical, biological, bacterial, or chemical factors using industry-standard software like MIKE, Delft3D, SIMCAT, and/or ICM.Conceptualizing and scoping modelling methodologies, assessing risks and opportunities in each case.Conducting and reviewing hydrological assessments, including Flood Estimation Handbook, ReFH2, and WINFAP.Leading efforts on tenders ranging from innovative one-off projects to multimillion-pound framework contracts.Guiding team members to facilitate their professional growth.Building strong relationships with clients and across various technical disciplines.Staying abreast of legislative developments and guidelines that may impact our services.Utilizing AECOM’s project management systems to ensure the delivery of high-quality outputs to our clients, within the agreed timelines and budget.Collaborating closely with clients and teams of engineers and technical specialists to support a diverse range of flood risk management projects, including fluvial, coastal, surface water, and drainage.If you have a passion for innovation and a desire to transform visionary ideas into reality, AECOM welcomes you. Join our team, where we don't merely construct infrastructure; we uplift communities and enhance lives. Follow our AECOM Water page on LinkedIn to stay updated on the significant projects we're undertaking and witness the positive impact we're making in the industry!Grow with us.Become part of our dynamic Water business, consisting of around 700 experts across the UK & Ireland. Work alongside top engineers and consultants to deliver a wide array of engaging projects, from small initiatives to large-scale endeavors.

Mar 5, 2026
Apply
companyAECOM logo
Full-time|On-site|Cardiff

Join our dynamic team at AECOM as a Principal Town Planner in Cardiff. In this pivotal role, you will lead planning projects, providing expert guidance on land use and urban development. Collaborate with various stakeholders, including government agencies and community groups, to ensure sustainable and innovative planning solutions. Your expertise will be crucial in shaping the future of urban environments, making a positive impact on communities.

Jan 8, 2026
Apply
company
Full-time|Hybrid|Cardiff, Wales, United Kingdom

Join us at Engine by Starling, where we are excited to partner with forward-thinking banks globally, empowering them to establish high-growth businesses using our cutting-edge technology.Engine operates as Starling's innovative software-as-a-service (SaaS) division, developed to fuel Starling's growth. Recently, we have transitioned into an independent entity, continuing to deliver exceptional software solutions.Starling has achieved remarkable success, largely due to our proprietary technology developed from the ground up. This robust SaaS platform is now accessible to banks and financial institutions worldwide, allowing them to leverage the pioneering digital features and streamlined back-office operations that have contributed to Starling's achievements.Our engineering team is the heartbeat of Engine, thriving in a dynamic environment focused on creation, innovation, and disruptive technology that keeps us at the forefront of the fintech landscape. We foster a flat organizational structure that empowers you to make impactful decisions, regardless of your role. Collaboration and support are woven into our culture, ensuring you're never alone on this journey!To excel at Engine, we seek proactive individuals who take ownership of their responsibilities—from development and design to knowledge sharing and optimizing processes for superior customer outcomes. Our core values—Listen, Keep It Simple, Do The Right Thing, Own It, and Aim For Greatness—guide our mission.Hybrid WorkingWe embrace a hybrid working approach at Engine, preferring candidates who can commute to our Cardiff office for collaborative in-person interactions.About Engineering at Engine by Starling - Explore our engineering careers

Nov 10, 2025
Apply
company
Full-time|Hybrid|Cardiff, Wales, United Kingdom

Join us at Engine by Starling, where we are committed to collaborating with top banks globally, helping them leverage our innovative technology for rapid growth.Engine, Starling's software-as-a-service (SaaS) division, was established to deliver the cutting-edge technology powering Starling, and has since evolved into a standalone entity. Our exceptional growth trajectory is a testament to the robust, modern technology we've engineered from the ground up.As a leader in the industry, we offer our SaaS platform to banks and financial institutions worldwide, empowering them with innovative digital features and streamlined back-office processes that have fueled our own success.At Engine, everyone is encouraged to contribute to delivering exceptional outcomes for our clients. As an engineering-focused organization, we are seeking passionate individuals who are excited about the transformative potential of our technology in banking across diverse markets. Our core values guide us: Listen, Keep It Simple, Do The Right Thing, Own It, and Aim For Greatness.Hybrid Working ModelWe embrace a hybrid working approach, favoring candidates who are within a commutable distance to one of our offices, fostering in-person collaboration.About Our Engineering TeamThe Cross Cutting Engineering team is the driving force behind our innovation. We focus on creating and maintaining reliable, scalable, and maintainable infrastructure and tools for our software delivery pipeline, from initial code to seamless production deployment and ongoing operations. We tackle complex challenges with a first-principles mindset in a multidisciplinary environment that encourages exploration and contribution across the platform.As a Platform Engineer, you’ll play a pivotal role in building and scaling our state-of-the-art cloud-native banking platform across various global cloud providers and regions. We are seeking engineers with a strong SRE mindset who take ownership of the complete software delivery pipeline and are passionate about developing internal tools that empower our technology teams to operate their applications flawlessly in production.If you don't meet every criterion listed, don't worry! We value curiosity, a willingness to learn, and a desire to engage across multiple disciplines. If you are eager to face the challenges of building and operating a global, cloud-native platform, we would love to hear from you!

May 16, 2025
Apply
companyAECOM logo
Full-time|On-site|Cardiff

Join AECOM as a Highways and Traffic Engineer in Cardiff, where you'll play a vital role in designing and managing innovative transportation solutions. Your expertise will contribute to the development of sustainable infrastructure projects that enhance mobility and safety for communities.

Apr 13, 2026
Apply
companydev2 logo
Full-time|On-site|Cardiff

Join Our Team as the Head of EngineeringAt dev2, we are seeking a dynamic and experienced leader to oversee our engineering department. As the Head of Engineering, you will play a pivotal role in shaping our technical strategy, ensuring the successful delivery of projects, and fostering a culture of innovation and collaboration within the team.Your expertise will guide our engineering practices, drive the implementation of best practices, and mentor our talented engineers to excel in their roles. If you have a passion for technology and leadership, we want to hear from you!

Jan 23, 2023
Apply
companyjobsforhumanity logo
Full-time|On-site|Cardiff

As a Senior Engineer at jobsforhumanity in Cardiff, this position centers on using technical expertise to help build solutions with real impact. The team values new ideas and aims to create products that matter. Role overview This role calls for strong engineering skills and a collaborative approach. The Senior Engineer will contribute to projects that support the company’s mission and help shape the direction of ongoing work. What you will do Apply technical knowledge to develop and improve solutions Work alongside colleagues to deliver projects with purpose Support efforts that drive positive change within the organization Requirements Experience in an engineering role at a senior level Ability to contribute ideas and technical insight to team projects

Apr 30, 2026
Apply
companyAECOM logo
Full-time|On-site|Cardiff

Join our dynamic team at AECOM as a Senior Highways and Traffic Engineer, where you will play a pivotal role in shaping the future of transportation infrastructure. In this position, you will be responsible for leading the design and implementation of innovative highways and traffic management solutions. Your expertise will contribute to projects that enhance safety, efficiency, and sustainability in urban mobility.As a key member of our engineering team, you will collaborate with multidisciplinary professionals to deliver high-quality results. This role offers an exciting opportunity to work on a diverse range of projects, from large-scale urban developments to critical infrastructure upgrades.

Nov 12, 2025
Apply
companyMonzo logo
Remote|Remote|Cardiff, London or Remote (UK)

Join us in revolutionizing the banking experience for everyone! At Monzo, we are committed to simplifying finance and making money work better for our customers. Originating as a prepaid card, Monzo has evolved significantly over the past decade, now offering diverse banking solutions including personal and business accounts, joint accounts, youth accounts, and more. Our innovative features, such as early access to funds and robust financial education, ensure that our customers enjoy magical moments in their financial journeys. We focus on problem-solving rather than just selling products, aiming to create transformative experiences for our users . As an Engineering Manager, you will lead cross-functional teams that include Product Managers, engineers, data scientists, and designers, driving impactful outcomes while fostering a culture of inclusivity and excellence.

Feb 2, 2026
Apply
companyAECOM logo
Full-time|On-site|Cardiff

Are you a recent graduate excited to kickstart your engineering career? AECOM is seeking a Graduate Traffic Engineer to join our innovative team in Cardiff. In this role, you will be involved in various traffic engineering projects, working collaboratively with experienced professionals to develop sustainable transportation solutions.Your responsibilities will include conducting traffic analyses, preparing reports, and assisting in the design of traffic management systems. We are looking for a proactive individual with a passion for engineering and a desire to contribute to impactful projects.

Nov 24, 2025
Apply
companyMonzo logo
Remote|Remote|Cardiff, London or Remote (UK)

Join us at Monzo on our mission to revolutionize banking and make money accessible for everyone! We are moving away from the complexities of traditional banking and have transformed our offerings significantly over the past decade. From our origins as a prepaid card, Monzo now provides a diverse range of services including personal and business bank accounts, joint accounts, accounts for 16-17 year-olds, free kids accounts, and credit cards. Our users can also save, invest, and manage their pensions all in one place. With our vibrant hot coral cards and innovative features, such as early salary access, coupled with our award-winning customer service and financial education initiatives, we are dedicated to creating extraordinary experiences for our customers. If you're passionate about solving problems and making a positive impact, we would love to have you on our team!

Feb 2, 2026
Apply
companySecuritas logo
Full-time|On-site|Cardiff

Join Securitas as a Fire & Security Engineer, where you will play a crucial role in ensuring safety and security for our clients. This position offers the opportunity to work with cutting-edge technology while developing your skills in a supportive environment.

Mar 5, 2026
Apply
companyAECOM logo
Full-time|Hybrid|Cardiff

Begin your journey. Advance your career.Are you enthusiastic about Marine Ecology and eager to make a significant impact?Join our vibrant Nature team as a Principal Marine Ecologist based in one of our offices throughout the UK and Ireland, including Basingstoke, Manchester, Glasgow, Bristol, Leeds, Birmingham, Cambridge, and Dublin. Our flexible hybrid working model allows you to balance your professional and personal life effectively. In this role, you will leverage your skills, knowledge, and expertise to contribute to both national and international projects. Our portfolio encompasses a wide array of sectors, such as high-profile power and infrastructure initiatives (including floating offshore wind), national and international interconnectors, habitat restoration efforts, flood defense projects, and coastal development schemes (e.g., marinas, jetties, slipways, and port developments).You will collaborate with a dedicated team of marine and aquatic ecologists and marine EIA specialists to enhance the growth and development of our marine ecology team while expanding our portfolio of prestigious marine projects. As a client-facing professional, you will assume responsibility for technical project delivery and business development, reporting directly to the Marine Ecology Lead.Your key responsibilities will include:Acting as a Subject Matter Expert: Provide expert marine ecological and marine consenting guidance, both internally and externally. Direct contributions to various workstreams and deliverables across a diverse range of projects, including participation in the comprehensive EIA or DCO development cycle of major initiatives. Deliver marine ecology impact assessments, including ES chapters, HRA, MCZ, WFD, and support for all necessary license and permitting applications for marine projects.Ensuring Quality: Maintain a keen attention to detail to guarantee that our deliverables meet the highest quality standards and adhere to our rigorous quality management protocols. Possess exceptional writing and communication skills, capable of tailoring complex scientific information for diverse audiences.Collaboration: Work within a multidisciplinary team to enhance the environmental outcomes of our projects, collaborating with specialists in underwater acoustics, coastal processes, water science, and marine archaeology, as well as EIA colleagues.Driving Growth and Business Development: Contribute to the marine ecology team's business development efforts by creating technical and fee proposals, as well as broader marketing strategies. Confidently present to internal and external stakeholders and facilitate client interactions.Project Management: Exhibit effective project management skills to oversee project delivery.

Feb 24, 2026

Sign in to browse more jobs

Create account — see all 51 results

Tailoring 0 resumes

We'll move completed jobs to Ready to Apply automatically.