Lead Engineer - Marketing & Engagement Technology (London)

The LEGO Group is looking for a Lead Engineer to join our Marketing & Engagement Technology team based in London! Are you skilled at bringing together experts in Data Engineering, Backend Engineering, and MLOps to work toward a shared technical vision? Are you motivated to lead engineering on a product to deliver personalisation at scale for the LEGO Group? If that sounds like you … join us!

No relocation assistance is offered for this position.

Core Responsibilities

• Shape the engineering strategy for the personalisation domain within Consumer & Marketing Technology, balancing current needs with long-term technical direction.
• Partner cross-functionally with the competency lead, product manager, and senior data scientists to shape requirements and translate them into actionable engineering plans.
• Collaborate closely across teams to align on architecture, technical approaches, and shared goals ensuring consistency and cohesion in delivery.
• Lead the design and development of scalable, reusable solutions for some of our most complex and high-impact challenges - spanning machine learning systems and backend architecture.
• Be a trusted sparring partner to engineers and data scientists - reviewing designs, guiding code quality, and influencing key technical decisions.
• Mentor and empower engineers across your area, helping them grow through sponsorship, feedback, and knowledge sharing.

We are building an omnichannel personalisation engine to bring increasingly personalised experiences to LEGO Shoppers in an exciting, relevant, and ethical way. This team consists of data scientists, data engineers and software engineers who collaborate closely to build and serve machine learning recommendation models to power these new experiences at scale across all digital channels.

As our Lead Engineer, you will report into the Engineering Director. In addition to your primary focus of driving the technical implementation for your product, you will work with other lead engineers on implementing consistent technical standards across the organization.

Do you have what it takes?

You lead with curiosity, collaboration, and care. You enjoy taking on sophisticated challenges across subject areas, thrive in multi-functional teams, and communicate ideas clearly—especially through visual tools like architecture diagrams. You’re motivated by impact, value security and reliability, and help others grow by sharing knowledge and delegating with intent. You champion inclusivity, lead by example, and advocate for engineering excellence while balancing business goals.

Your skills include:

• Leading large-scale engineering efforts across Data Science, ML Engineering, and Software Engineering.
• Designing and communicating architecture visually (we use the C4 model).
• Leading data lifecycles and orchestrating data at scale for ML systems.
• Deep expertise in relational databases and data modelling.
• Supporting data scientists with tooling, workflows, and model optimisation.
• Advanced experience with cloud platforms, infrastructure as code (AWS, Terraform, Databricks).
• Proficiency in SQL and one or more of our core languages, Python 3 / TypeScript; knowledge of core programming principles to adapt to other languages as needed.
• Building resilient, scalable web APIs to serve ML-powered recommendations.
• Applying domain-driven design and loosely coupled architecture principles.
• Setting up and maintaining robust CI/CD pipelines.
• Running highly available systems with strong observability practices.
• Collaborating effectively across teams.
• Contributing to open-source or inner-source projects with thoughtful input.

Applications are reviewed on an ongoing basis. However, please note we do amend or withdraw our jobs and reserve the right to do so at any time, including prior to any advertised closing date. So, if you’re interested in this role we encourage you to apply as soon as possible.

What’s in it for you?

• Family Care Leave - We offer enhanced paid leave options for those important times.
• Insurances – All colleagues are covered by our life and disability insurance which provides protection and peace of mind.
• Wellbeing - We want our people to feel well and thrive. We offer resources and benefits to nurture physical and mental wellbeing along with opportunities to build community and inspire creativity.
• Colleague Discount – We know you'll love to build, so from day 1 you will qualify for our generous colleague discount.
• Bonus - We do our best work to succeed together. When goals are reached and if eligible, you’ll be rewarded through our bonus scheme.
• Workplace - When you join the team you’ll be assigned a primary workplace location i.e. one of our Offices, stores or factories. Our hybrid work policy means an average of 3 days per week in the office. The hiring team will discuss the policy and role eligibility with you during the recruitment process.

Children are our role models. Their curiosity, creativity and imagination inspire everything we do. We strive to create a diverse, dynamic and inclusive culture of play at the LEGO Group, where everyone feels safe, valued and they belong.

The LEGO Group is highly committed to equal employment opportunity and equal pay and seeks to encourage applicants from all backgrounds (eg. sex, gender identity or expression, race/ethnicity, national origin, sexual orientation, disability, age and religion) to apply for roles in our team.

The LEGO Group is fully committed to Children’s Rights and Child Wellbeing across the globe. Candidates offered positions with high engagement with children are required to take part in Child Safeguarding Background Screening, as a condition of the offer. Thank you for sharing our global commitment to Children’s Rights.

Just imagine building your dream career. Then make it real. Join the LEGO team today.