Full Stack Software Engineer

NielsenIQ; San Sebastián de los Reyes; On-site; EUR 55,000 - 60,000; Full time

Benefits offered by this job

Flexible working environment

Volunteer time off

Job summary

NIQ Cadence helps brands optimize marketing budgets using AI-driven software. The role covers building CadenceIO front-end features from Angular screens to the Python API, deployed on AKS, and aligning with design systems for WCAG 2.1 AA accessibility.

You’ll collaborate with product engineers, designers, other frontend engineers, backend engineers, QA, and operators to deliver end-to-end features and ensure production readiness.

Qualifications

• 5+ years of professional software development, mostly on the front end, with 3+ years of Angular.
• 2+ years of backend development in Python, on APIs in production, with PostgreSQL and Alembic migrations.
• TypeScript, RxJS, and state management with NgRx or Angular signals.
• UIs with data grids, charts, and complex reactive forms.
• Accessible UIs to WCAG 2.1 AA, implemented from Figma designs.
• REST APIs on the client and on the server, with request/response schemas, validation, error codes, and pagination.
• Polars or pandas, and export of tabular data to Excel workbooks.
• Unit tests and end-to-end tests with Playwright or Cypress.
• Docker and Kubernetes expertise to deploy a service and diagnose pod failures.
• Model Context Protocol (MCP) servers or similar tooling for LLM API calls.
• Code reviews with specific comments that tell the author what to change.
• Clear explanations of technical decisions to product engineers and designers.

Responsibilities

• Deliver each feature end to end: write design, build Angular screens and FastAPI endpoints, deploy to AKS.
• Build screens for large data sets: multi-step wizards, editable tables, charts, live logs.
• Implement Figma designs with design tokens and WCAG 2.1 AA accessibility.
• Set front-end structure: folder layout, NgRx state, Angular signals.
• Review PRs and refine front-end conventions with the team.
• Fix defects identified by QA/operators; decide client vs API fixes.
• Release features and hotfixes to production.
• Adopt team software engineering and AI-assisted development practices.

Skills

5+ years frontend development

3+ years Angular

2+ years Python backend

TypeScript & RxJS

REST APIs & schemas

UI with grids & charts

WCAG 2.1 AA accessibility

Unit & E2E testing

Docker & Kubernetes

Azure Kubernetes Service (AKS)

MCP servers / LLM API calls

Code reviews & feedback

Clear technical decision making

Tools

Angular

FastAPI

AKS

PostgreSQL

Alembic migrations

NgRx / Angular signals

Playwright

Cypress

Docker

Kubernetes

Figma design tokens

WCAG testing

Job description

• Compensation: EUR 55,000 - EUR 60,000 - yearly

Company Description

NIQ Cadence helps brands decide how to spend their marketing budget across channels. Cadence is a compound AI operating system for marketing effectiveness. It combines Marketing Mix Modeling (MMM), budget optimization, and LLM agents.

CadenceIO is the operator UI of Cadence. Operators use CadenceIO to load media data, run MMM models, and publish the results to brands. In this role, you build CadenceIO features from the Angular screen to the Python API. You also help shape the front-end conventions of the team.

Job Description

What you will do:

• Deliver each feature end to end. Write the design, build the Angular screens and the FastAPI endpoints, and deploy the feature to Azure Kubernetes Service (AKS).
• Build screens for large data sets, such as multi-step wizards, editable tables, charts, and live logs of model jobs.
• Implement Figma designs with the tokens of the design system, and make each screen accessible to WCAG 2.1 AA.
• Set the structure of the front-end code, from the folder layout to the state in NgRx and Angular signals.
• Review the pull requests of other engineers, and propose changes to the front-end conventions of the team.
• Fix the defects that QA and operators find. For each defect, decide if the fix goes in the client or in the API.
• Release features and hotfixes to production.
• Adopt the software engineering and AI-assisted development principles of the team.

Who you will work with:

You join the CadenceIO development team. Each day, you work with:

• The product engineer, who sets the scope of each sprint. You tell the product engineer which part of the scope fits.
• The designer, who owns the Figma designs and the design system. You tell the designer when a value in a design is incorrect.
• The other front-end engineers on the team, who build CadenceIO with you.
• Backend engineers, who build the data, modeling, and AI services that CadenceIO calls.
• QA engineers and operators, who test each release before it goes to production.

Qualifications

What you bring:

• 5 or more years of professional software development, mostly on the front end, with 3 or more years of Angular.
• 2 or more years of backend development in Python, on APIs in production, with PostgreSQL and Alembic migrations.
• TypeScript, RxJS, and state management with NgRx or Angular signals.
• UIs with data grids, charts, and complex reactive forms.
• Accessible UIs to WCAG 2.1 AA, implemented from Figma designs.
• REST APIs on the client and on the server, with request and response schemas, validation, error status codes, and pagination.
• Polars or pandas, and the export of tabular data to Excel workbooks.
• Unit tests, and end-to-end tests with Playwright or Cypress.
• Docker and Kubernetes expertise to deploy a service and find the cause of a pod failure.
• Model Context Protocol (MCP) servers, or other tools that let an LLM agent call an API.
• Code reviews with specific comments that tell the author what to change.
• Clear explanations of technical decisions to product engineers and designers.

Additional Information

• Flexible working environment
• Volunteer time off

NIQ may utilize artificial intelligence (AI) tools at various stages of the recruitment process, including résumé screening, candidate assessments, interview scheduling, job matching, communication support, and certain administrative tasks that help streamline workflows. These tools are intended to improve efficiency and support fair and consistent evaluation based on job-related criteria. All use of AI is governed by NIQ’s principles of fairness, transparency, human oversight, and inclusion. Final hiring decisions are made exclusively by humans. NIQ regularly reviews its AI tools to help mitigate bias and ensure compliance with applicable laws and regulations. If you have questions, require accommodations, or wish to request human review were permitted by law, please contact your local HR representative. For more information, please visit NIQ’s AI Safety Policies and Guiding Principles: https://nielseniq.com/global/en/info/niqs-ai-safety-policies/

About NIQ

NIQ is the world’s leading consumer intelligence company, delivering the most complete understanding of consumer buying behavior and revealing new pathways to growth. In 2023, NIQ combined with GfK, bringing together the two industry leaders with unparalleled global reach. With a holistic retail read and the most comprehensive consumer insights—delivered with advanced analytics through state-of-the-art platforms—NIQ delivers the Full View™. NIQ is an Advent International portfolio company with operations in 100+ markets, covering more than 90% of the world’s population.

For more information, visit NIQ.com

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Our commitment to Diversity, Equity, and Inclusion

At NIQ, we are steadfast in our commitment to fostering an inclusive workplace that mirrors the rich diversity of the communities and markets we serve. We believe that embracing a wide range of perspectives drives innovation and excellence.All employment decisions at NIQ are made without regard to race, color, religion, sex (including pregnancy, sexual orientation, or gender identity), national origin, age, disability, genetic information, marital status, veteran status, or any other characteristic protected by applicable laws.We invite individuals who share our dedication to inclusivity and equity to join us in making a meaningful impact.To learn more about our ongoing efforts in diversity and inclusion, please visit the https://nielseniq.com/global/en/news-center/diversity-inclusion