Senior Software Engineer

Kantar; Greater London; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Flexible hybrid working

25 days leave

2 days volunteering and life event-lea

Competitive salary and bonus

Company pension

Enhanced parental leave

Healthcare options

Wide range of flexible benefits

Job summary

Kantar is hiring a Senior Software Engineer to design, build, and evolve core backend services powering internal platforms. You will work with Node.js and TypeScript to deliver scalable APIs that support reporting and data access.

The role offers a flexible hybrid setup (London or Reading) with cross‑team collaboration, strong emphasis on code quality, security, and long‑term maintainability.

Qualifications

• Experience building backend services with Node.js and TypeScript.
• Experience with PostgreSQL or MongoDB and ORMs (Prisma/Sequelize).
• API design experience (REST/GraphQL).
• Knowledge of secure, reliable backend systems.
• Strong communication and collaboration.

Responsibilities

• Design, build, and maintain scalable backend services.
• Develop robust APIs to support internal platforms and reporting.
• Collaborate with product and engineering teams to gather requirements.
• Ensure data accuracy and scalable database integrations.
• Contribute to code quality, performance, and engineering standards.

Skills

Node.js

TypeScript

APIs (REST/GraphQL)

Backend design

Communication

Tools

Prisma

Sequelize

PostgreSQL

MongoDB

Job description

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 TypeScript
• Developing robust APIs that support our internal platforms and reporting needs
• Working closely with product and engineering teams to understand requirements and deliver reliable solutions
• Ensuring data is accurate, consistent, and scalable through effective database integrations
• Contributing 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 TypeScript
• Confidence working with databases such as PostgreSQL or MongoDB, and ORMs like Prisma or Sequelize
• Experience designing and maintaining APIs (REST and/or GraphQL)
• An understanding of how to build secure, reliable backend systems
• Clear communication skills and a collaborative approach to problem‑solving

Nice to have (but not essential):

• Experience with authentication and security concepts
• Familiarity with event‑driven systems or messaging tools
• Exposure to testing frameworks, CI/CD pipelines, or cloud platforms

What’s in it for you

• Flexible hybrid working
• 25 days leave, 2 days paid for volunteering and life event leave
• Competitive salary and bonus (bonus dependent on role)
• Company pension
• Enhanced parental leave
• Healthcare options
• Wide 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.