Location
London, South Bank Central

Hours
Full Time

Salary
Negotiable

About the Role
As a Senior Software Engineer in Kantar's Digital Twins Division, you will help build the systems behind one of the company’s most ambitious AI products. Your work will enable thousands of AI-driven “digital twins” to simulate real-world consumer behaviour in real time, providing brands with powerful insights into complex decisions. This role focuses on scalable backend systems, event-driven architectures, and AI-enabled platforms. You will collaborate closely with product, data science, and platform teams to transform advanced AI capabilities into reliable, production-ready systems that directly shape how clients interact with data and insights at scale.

You will design and build technology that supports growth and ambition, including creating scalable, distributed backend services for AI-driven applications, building event-driven systems that process large volumes of behavioural data in real time, developing services in Node.js/TypeScript and/or Python, designing APIs for high-throughput, low-latency workloads, and helping orchestrate and optimise AI agent-based systems running at scale. Additionally, you will contribute to technical direction, mentor colleagues, and help improve platform development and operations continuously.

Company Overview
Kantar is the world’s leading data, insights, and consulting company. With 30,000 people worldwide, Kantar combines expertise in human understanding with advanced technologies to help the world’s leading organisations succeed and grow. The company is committed to creating an inclusive, diverse, and supportive working environment where mental health and wellbeing are prioritised.

Experience
- Strong backend engineering experience with cloud-based systems (Azure, AWS or GCP)
- Experience designing distributed or event-driven architectures (Kafka or similar)
- Proficiency in TypeScript/Node.js and/or Python
- Experience building scalable APIs and microservices
- Working knowledge of containers and cloud-native delivery approaches
- Curiosity about AI-enabled systems and responsible scaling
- Experience with LLMs, AI agent orchestration, or tools such as RAG, vector databases or LangChain is a bonus but not essential

About you
You are passionate about building scalable backend systems and enjoy working collaboratively across teams. You are motivated to mentor others and contribute to technical strategy. You embrace innovation and have a curiosity about AI technologies and their real-world applications. You thrive in a fast-paced environment and are committed to delivering high-quality, production-ready software.

Qualifications
Relevant experience in software engineering and backend development is essential. Formal qualifications are not explicitly stated but a strong technical background and proven track record in backend/cloud systems is expected.

Additional Information
Kantar offers flexible hybrid working, 25 days leave plus 2 days paid volunteering and life event leave, competitive salary and bonus (role dependent), company pension, enhanced parental leave, healthcare options, and a wide range of flexible benefits. Visa sponsorship and relocation support are not available for this role. Please ensure you have the right to work in the UK before applying.