Senior Software Engineer

We go beyond the obvious, using intelligence, passion and creativity to inspire new thinking and shape the world we live in.

To start a career that is out of the ordinary, please apply...

Job Details

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

On top of all your normal benefits like holiday, meal cards and life assurance, we also offer:

Five days of Life Leave per year; for those days when life just…gets in the way.

Birthday leave – one extra day of holiday taken on the nearest workday to your birthday

Two days a year to give back and volunteer with an organisation of your choice.

Enhanced primary and secondary carer leave for however you choose to grow your family.

The chance to hit the beach on your lunch break (yes, we have somewhere you can store your surfboard!)

Please be aware, the majority of our roles are hybrid, working three days a week in our office.

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.

What part of Kantar might I be joining?

You’ll be joining our Profiles division, home to specialists in survey design, sampling and data science. With the world’s largest audience network (over 170 million people), we’re trusted by many of the worlds leading brands to provide amazing insights from real people.

Location

Porto, R. Dom João IPortugal

Kantar Rewards Statement

At Kantar we have an integrated way of rewarding our people based around a simple, clear and consistent set of principles. Our approach helps to ensure we are market competitive and also to support a pay for performance culture, where your reward and career progression opportunities are linked to what you deliver.

We go beyond the obvious, using intelligence, passion and creativity to inspire new thinking and shape the world we live in. Apply for a career that’s out of the ordinary and join us.

We want to create an equality of opportunity in a fair and supportive working environment where people feel included, accepted and are allowed to flourish in a space where their mental health and well being is taken into consideration.

We want to create a more diverse community to expand our talent pool, be locally representative, drive diversity of thinking and better commercial outcomes.

Kantar is the world’s leading data, insights and consulting company. We understand more about how people think, feel, shop, share, vote and view than anyone else. Combining our expertise in human understanding with advanced technologies, Kantar’s 30,000 people help the world’s leading organisations succeed and grow.