Software Engineer II - Frontend

Ookla; Madrid; On-site; EUR 50,000 - 80,000; Full time

Job summary

Ookla is seeking a Software Engineer to join a team building next‑generation platforms for data visualization and connectivity insights. You’ll work across the stack with React, Redux Toolkit, Vite, and Node.js to deliver scalable web apps and robust RESTful APIs.

You’ll participate in agile delivery, contribute to UX improvements, and explore AI-assisted tooling to speed up development while maintaining human oversight. Strong collaboration and problem-solving are essential.

Qualifications

• Bachelor's or Master's degree in CS/SE or equivalent experience.
• Minimum of 2 years of full-stack web development experience.
• Proficient with React, Redux Toolkit, Vite and modern JS/HTML/CSS.
• Experience designing RESTful APIs with Node.js or similar backend tech.
• Familiarity with CI/CD pipelines and automated testing (Vitest, RTL).

Responsibilities

• Develop and maintain robust, scalable web apps using React, Redux Toolkit and Vite.
• Collaborate with cross-functional teams to design new features for data visualization platforms.
• Write clean, efficient code and perform code reviews and debugging.
• Develop and test RESTful APIs for data processing.
• Participate in agile sprints and continuous improvement initiatives.
• Ensure accessible, responsive UX with attention to fine UX details and interactions.

Skills

React

Redux Toolkit

Vite

Node.js

RESTful APIs

CI/CD

Vitest

RTL

TypeScript

MUI

MapboxGL

Education

Bachelor's degree in Computer Science / Software Engineering

Master's degree in Computer Science / related field

Tools

MapboxGL

AWS

SQL

Job description

The Opportunity:

We are seeking a talented Software Engineer to join a team of passionate engineers that are tasked with the unique opportunity to build next-generation platforms that will pave the path for many other teams at Ookla to follow. This team manages Ookla's flagship enterprise products, the most prominent of which provides a whole new way to combine data from different sources to visualize, analyze, and inspire real-world action to improve connectivity, and is a centerpiece in Ookla's strategy to bring connectivity insights to a wide array of industries and geographies. The modern era has made telecommunications essential to daily life. While our target markets are government entities that are striving to invest and improve broadband access and performance in their jurisdictions along with network operators that are seeking to maximize their revenue opportunities through thoughtful investments in their network, there are many potential customers that could benefit from our products and services.

To be successful in this mission, we use mapping technologies and high performance database systems to produce highly interactive and performant means of understanding large quantities of data at a glance. To do this we work in informal cross-functional squads that include more backend focused engineers or data engineers depending on the project. We use each of these skill sets to problem-solve across the software stack, and you’re welcome to contribute to multiple codebases.

Key Responsibilities:

• Develop and maintain robust and scalable web applications using React, Redux (RTK Toolkit), and Vite
• Collaborate with cross-functional teams to design, develop and implement new features and functionalities for our data visualization platforms and portals
• Write clean, maintainable, and efficient code and adhere to best practices in software development
• Conduct code reviews, debugging, and troubleshooting to ensure the quality of the codebase
• Help develop, maintain and test RESTful APIs for data processing and handling
• Participate in agile development methodologies and contribute to continuous improvement initiatives
• Troubleshoot and resolve complex software issues, identifying and implementing solutions in a timely manner
• Eye for detail and knack for noticing and perfecting subtle interactions and fine points that impact user experience
• Harness AI tooling for speeding up development while still emphasizing human oversight
• Stay up-to-date with emerging trends and technologies in full-stack web development and apply them to our stack

Job Requirements:

• Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field or equivalent working experience
• Minimum of 2 years of professional experience in full-stack web development
• Proficient in React, Redux (preferably Redux Toolkit), and Vite with hands-on experience building complex web applications
• Strong understanding of modern JavaScript, HTML, CSS, and other front-end technologies
• Some experience in designing and developing RESTful APIs using Node.js or other backend technologies
• Familiarity with agile development methodologies and continuous integration and deployment (CI/CD) pipelines
• Proficient in writing automated tests and understanding/recommending various testing strategies; Vitest, React Testing Library (RTL) experience preferred
• Strong communication and collaboration skillsAbility to work independently as well as in a team environment
• Excellent problem-solving, algorithmic, and analytical skills
• Ability to thrive in a fast-paced, dynamic environment

Nice to have:

• Experience with various mapping libraries like MapboxGL (preferred), Leaflet.js, or OpenLayers
• Much preferred to have experience with TypeScript
• Experience with Material UI (MUI)
• Basic understanding of monorepos and the infrastructure required to support them
• Understanding of Accessible user experiences in web applications (WCAG 2.2)
• Experience using AWS or similar cloud computing environments to build and scale a web application
• Familiarity with storing data in relational databases and writing SQL
• Experience writing APIs or other code in Go, Python, or Ruby
• Comfort with collaborating with a design team, providing suggestions and feedback while iterating on UX designs

About

Ookla, an Accenture company, is a global leader in connectivity intelligence that brings together the trusted expertise of Speedtest®, Downdetector®, Ekahau®, and RootMetrics® to deliver unmatched network and connectivity insights. By combining multi-source data with industry-leading expertise, we transform network performance metrics into strategic, actionable insights.

Our solutions empower service providers, enterprises, and governments with the critical data and insights needed to optimize networks, enhance digital experiences, and help close the digital divide. At the same time, we amplify the real-world experiences of individuals and businesses that rely on connectivity to work, learn, and communicate. From measuring and analyzing connectivity to driving industry innovation, Ookla helps the world stay connected.

About Accenture

Accenture helps the world's leading enterprises reinvent by building their digital core and unleashing the power of AI to create value at speed for organizations across industries. Our strategy is to be the reinvention partner of choice for our clients and lead in the safe, widespread adoption of AI, and to be the most client focused, AI-enabled, great place to work in the world. We bring together the talent of our approximately 799,000 people with proprietary assets and platforms, deep process and industry expertise, and leading ecosystem relationships to deliver end-to-end solutions and measurable outcomes at scale. Through our Reinvention Services, we offer broad expertise across Cybersecurity, Digital Core, Finance, Industry and Enterprise, Song, Supply Chain and Engineering, and Talent, with advanced capabilities in AI and Data, Industry and Process, and Technology. We serve approximately 9,000 clients and generated approximately $70 billion in FY25 revenue. Visit us at accenture.com.