Position Overview
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 will balance the role of individual contributor while providing technical direction and mentoring a small cross‑functional team of engineers and data scientists.
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 across Mott MacDonald 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 closely 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. 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.
Qualifications
* 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.
* 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).
Benefits & Perks
* Private medical insurance for all UK colleagues.
* Health cash plan to support you with everyday health costs and treatments.
* Access to Peppy, providing free support from menopause experts for all UK colleagues.
* Flexible benefits, including increased life assurance cover, critical illness insurance, payroll savings and will writing.
* We match employee pension contributions between 4.5% and 7%.
* Life assurance equal up to 4× your basic salary, with the option to increase the level of cover to 6× your salary.
* Our income protection scheme provides a financial benefit, as well as absence and return to work support.
* As an independently owned business we share the financial success of the business with all our colleagues in various ways including annual bonus schemes.
Equality, Diversity, and Inclusion
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. We put equality, diversity, and inclusion at the heart of our business, seeking to promote fair employment procedures and practices to ensure equal opportunities for all. We encourage individual expression in our workplace and are committed to creating an inclusive environment where everyone feels they can contribute. If you are disabled or need support to apply or attend an interview, please contact us and we will talk about how we can support you.
Working Agreement
Agile working: We believe it makes business sense for you and your manager to choose how you can work most effectively to meet your client, team, and personal commitments. We offer a hybrid working policy that embraces your well‑being, flexibility, and trust.
Additional Information
* A minimum of 33‑35 days holiday each year, inclusive of public holidays and dependent on level, with the ability to buy or sell leave through our flexible benefits programme.
* Holiday entitlement increased to a minimum of 35 days after 5 years' service.
* Variety of employee saving schemes and discounts from high‑street retailers.
* Enhanced family leave policies, including 26 weeks paid maternity and adoption leave, and two weeks paid paternity/partner leave.
* Our shared parental leave matches maternity leave meaning we pay up to 24 weeks at full pay.
* Up to five additional days leave are provided for those with significant caring responsibilities, two of which are paid.
* Primary annual professional institution subscription.
* A broad range of opportunities to enhance both technical and soft skills through mentoring, formal training, and self‑development options.
* Join a wide range of groups including our Advanced Employee Networks which support our LGBTQ+, gender, race and ethnicity, disability, and parents/carers communities.
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