Overview
Mott MacDonald is a global engineering, management, and development consultancy with over 20,000 employees across more than 50 countries and 140+ offices. We work across global industries, delivering work that defines our future and makes a societal impact in the communities we serve. Our people power our performance—we succeed when they do. We offer opportunities to collaborate, learn, and grow, with emphasis on excellence for every individual. As a proudly employee-owned business, we invest in creating a space where everyone feels empowered, included, and valued. Whatever your ambition, Mott MacDonald is where people come to be brilliant.
Location/s: London
Recruiter contact: Nikki George
About the business unit
Mott MacDonald’s support services are the driving force behind our organisation, enabling us to run efficiently and effectively. The team works collaboratively to offer specialist advice, best practice and technology to all areas of our business, designed for our global reach.
About the Role
We’re seeking a Principal Full Stack Engineer to lead the design, development, and scaling of AI-powered digital products that serve infrastructure, engineering, and consulting professionals around the globe. This is a hands-on leadership role that blends deep technical skills with strategic thinking. You’ll balance the role of individual contributor while providing technical direction and mentoring a small cross-functional team of engineers and data scientists, helping ensure excellence and strong delivery outcomes.
What You’ll Do
* Build scalable products: Design, build and maintain robust, secure full-stack applications that integrate AI/ML models and serve our external clients and internal users at global scale.
* Lead delivery: Take end-to-end technical ownership of digital product initiatives—from architecture and development through deployment, monitoring, and iteration.
* Mentor and manage: Support the growth and effectiveness of a small team of engineers and data scientists, promoting best practices in code quality, testing, and collaboration.
* Architect with intent: Contribute to and refine system architecture decisions to support modularity, reuse, performance, and long-term maintainability.
* Work across disciplines: Collaborate with data scientists and ML engineers to integrate models into production-grade products, and with product managers to shape roadmaps based on technical feasibility and user value.
* DevOps & CI/CD: Support cloud-native deployment pipelines, automated testing, and observability for everything we build.
* Champion software engineering excellence: Drive continuous improvement across software engineering culture, codebases, and development practices.
What You’ll Bring
* Clear communicator, with the ability to engage and influence both technical and non-technical audiences.
* Experience in software engineering with a focus on full-stack product development in cloud environments (Azure preferred).
* Demonstrated success building and scaling production systems with global reach and multi-region deployment.
* Strong proficiency and current experience in React, Typescript, Python and database systems (SQL + NoSQL).
* Experience with performance monitoring and logging tools, including CloudWatch, Sentry, or DataDog, to ensure application stability, performance optimisation, and effective issue resolution.
* Experience managing or mentoring engineering teams, including cross-functional collaboration.
* Understanding of secure architecture, API design, and performance optimisation.
* Experience with modern DevOps practices including CI/CD, containerisation (Docker, Kubernetes), and infrastructure as code (Terraform).
Why Join Us
* Build purposeful, high-impact products that help solve real-world infrastructure, environmental, and societal challenges.
* Be part of a mission-driven AI Solutions team that blends experimentation with delivery.
* Grow your leadership capabilities while remaining hands-on in a modern tech stack.
* Work with smart, collaborative colleagues who value clarity, pragmatism, and ownership.
We are actively recruiting a diverse workforce that is reflective of the communities we serve. We recognise that differences in ability, skills and experience are a strength and encourage applications from people of all backgrounds.
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UK Immigration & Working Arrangements
Mott MacDonald Ltd. are not currently offering sponsorship to candidates under the Skilled Worker visa route in the UK. This decision is a consequence of changes to the Skilled Worker route by the UK Government in April 2024. We welcome applications from candidates eligible for alternative immigration routes in the UK that do not require sponsorship as a Skilled Worker now or in the future.
Agile working
We offer a hybrid working policy that supports you and your manager to work effectively to meet client, team, and personal commitments.
Equality, diversity, and inclusion
We place equality, diversity, and inclusion at the heart of our business, promoting fair employment procedures and equal opportunities for all. We encourage individual expression and are committed to an inclusive environment where everyone can contribute.
Accessibility
If you are disabled or need support to apply or attend an interview, contact reasonable.adjustments@mottmac.com to discuss how we can support you.
Benefits
We offer a range of benefits including:
* Health and wellbeing
* Private medical insurance for UK colleagues
* Health cash plan to support everyday health costs
* Access to Peppy for menopause support
* Wellbeing program with family coverage
* Flexible benefits to tailor health options
* Financial wellbeing: pension match between 4.5% and 7%, life assurance up to 4x salary (option to 6x), income protection, and more
* Lifestyle: 33–35 days holiday (35 after 5 years), saving schemes, discounts
* Enhanced family and carers leave: maternity/adoption up to 26 weeks, shared parental leave up to 24 weeks, caring leave
Learning and development
Annual professional subscription and opportunities to enhance skills through mentoring, training, and self-development.
Networks and social impact
Join groups including Advanced Employee Networks supporting LGBTQ+, gender, race and ethnicity, disability, and parents/carers communities, and contribute to community programs.
Apply now, or for more information about our application process, click here.
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