Senior Software Engineer

Kantar is the world’s leading AI-native marketing data and analytics business and an indispensable brand partner to the world’s top companies. We combine the most meaningful attitudinal and behavioural data with deep expertise and advanced analytics to uncover how people think and act. We help clients understand what has happened and why and how to shape the marketing strategies that shape their future. Kantar’s Profiles division is home to the world’s largest audience network. With access to 170m+ people in over 100 global markets, we offer unrivalled global reach with local relevancy. Validated by industry leading anti-fraud technology, Kantar’s Profiles Audience Network delivers the most meaningful data with consistency, accuracy, and accountability – all at speed and scale. This role can be based in London or Reading on a hybrid basis (in the office two to three days a week). Why this role matters We’re known for our data. You’ll help us turn it into technology that teams and clients can rely on. At Kantar, technology plays a critical role in how we deliver trusted insights to the world’s leading brands. As a Senior Software Engineer, you’ll help build and evolve the core backend services that power our internal platforms, enabling teams across the business to access accurate, timely, and scalable data. You’ll work on backend systems that need to be dependable and easy to evolve, collaborating closely with product managers and fellow engineers to deliver APIs that are well‑designed, performant, and built with long‑term quality in mind. This is a role where you’ll combine hands‑on engineering with collaboration and influence, shaping both the solutions you build and how the team builds them. What you’ll be doing Designing, building, and maintaining scalable backend services using Node.js and TypeScriptDeveloping robust APIs that support our internal platforms and reporting needsWorking closely with product and engineering teams to understand requirements and deliver reliable solutionsEnsuring data is accurate, consistent, and scalable through effective database integrationsContributing to code quality, performance, and practical engineering standards across the team The skills and experience you’ll bring Strong experience building backend services using Node.js and TypeScriptConfidence working with databases such as PostgreSQL or MongoDB, and ORMs like Prisma or SequelizeExperience designing and maintaining APIs (REST and/or GraphQL)An understanding of how to build secure, reliable backend systemsClear communication skills and a collaborative approach to problem‑solving Nice to have (but not essential): Experience with authentication and security conceptsFamiliarity with event‑driven systems or messaging toolsExposure to testing frameworks, CI/CD pipelines, or cloud platforms What’s in it for you Flexible hybrid working25 days leave, 2 days paid for volunteering and life event leaveCompetitive salary and bonus (bonus dependent on role)Company pensionEnhanced parental leaveHealthcare optionsWide range of flexible benefits We’re not able to offer visa sponsorship or help with relocation support for this role. Please make sure you’ve got the right to work in the country where this role is located before applying.