Senior Frontend Software Engineer

KingMakers; Madrid; Presencial; EUR 45.000 - 70.000; Jornada completa

Descripción de la vacante

A leading sports entertainment company in Madrid is seeking a Senior Front-end Software Engineer. The role involves developing and maintaining high-performance web applications using React and TypeScript. You will work closely with cross-functional teams to optimize gaming platforms and enhance user experiences. Benefits include health coverage and hybrid work options.

Servicios

Health coverage

Hybrid work options

Competitive compensation

Formación

• Strong expertise in CSS and UI design principles.
• Proven experience building modern web applications with React, TypeScript, and JavaScript.
• Experience working with RESTful APIs for seamless backend integration.
• Familiarity with unit testing using Jest or similar tools.
• Deep understanding of frontend architectural patterns.

Responsabilidades

• Develop and maintain UI components using React and TypeScript.
• Integrate seamlessly with backend services through RESTful APIs.
• Build high-performance web applications.
• Ensure maintainability and performance with best practices.
• Write and maintain unit tests with Jest.

Conocimientos

CSS expertise

UI design principles

React experience

TypeScript knowledge

JavaScript proficiency

RESTful API integration

Unit testing with Jest

Frontend architectural patterns

CMS platforms experience

Cloudflare knowledge

Herramientas

Jest

Kibana

Elastic

Strapi

Umbraco

PNPM

Yarn

Vercel

Descripción del empleo

Overview

At KingMakers, we're redefining how millions of sports fans across Africa experience entertainment. Our mission is to deliver seamless, 24/7 digital sports and gaming experiences that bring people closer to the games they love, online and offline.

The Role :

As a Senior Front-end Software Engineer, you'll play a key role in ensuring our products are highly resilient, low-latency, and provide an exceptional customer experience. You'll work closely with Product Managers and a world-class engineering team to develop and optimize our gaming platforms, contributing to our rapid growth.

We're looking for someone who thrives on solving complex challenges, embraces cutting-edge engineering practices, and has a passion for creating reliable, high-performance systems. In this role, you'll collaborate closely with cross-functional teams to build, enhance, and support the platforms that power KingMakers’ expanding product portfolio.

This is more than just a technical role: it’s an opportunity to make a lasting impact. At KingMakers, we're bold in our ideas, fearless in tackling the hardest problems, and relentless in our pursuit of innovation. If you're ready to bring fresh perspectives, push boundaries, and shape the future of sports and gaming entertainment, we'd love to hear from you.

What you will be doing

• Develop and maintain UI components using React and TypeScript, ensuring high-quality and scalable solutions.
• Integrate seamlessly with backend services through RESTful APIs, delivering a smooth user experience.
• Build high-performance and responsive web applications that work flawlessly across devices.
• Ensure maintainability and performance with best practices in CSS, responsive design, and accessibility.
• Write and maintain unit tests with Jest or similar frameworks, ensuring code reliability.
• Architect scalable frontend solutions, leveraging patterns such as SSG, SSR, Islands, and Streaming SSR.

Requirements

• Strong expertise in CSS and UI design principles to create intuitive interfaces.
• Proven experience building modern web applications with React, TypeScript, and JavaScript.
• Experience working with RESTful APIs for seamless backend integration.
• Familiarity with unit testing using Jest or similar tools to maintain code quality.
• Deep understanding of frontend architectural patterns for scalable applications.
• Experience working with CMS platforms like Strapi or Umbraco.
• Knowledge of Cloudflare, Vercel, or similar platforms for web hosting.
• Familiarity with package managers such as PNPM or Yarn.
• Exposure to Application Performance Monitoring (APM) tools like Kibana and Elastic.

How you do it - Expectations for fulfilling your role

At KingMakers, culture isn’t just a set of words on a wall; it’s how we show up, how we work, and how we grow. We follow Our CROWNS — six bold, clear, and actionable values that guide how we make decisions, collaborate, and raise the bar for ourselves and each other:

• Customer First: We build with and for our customers, delivering real, meaningful value.
• Raise the Bar: We take initiative, own outcomes, and push for better every time.
• Operate with Candor: We build trust through openness and honesty.
• We Build Together: We collaborate across teams and support one another.
• No Hesitation, Never Reckless: We move boldly and responsibly, taking smart risks.
• Speed & Iteration: We act fast, learn fast, and improve fast.

Benefits

We offer competitive compensation and benefits tailored to each location, including health coverage, hybrid work options, and perks to help you thrive.

What We Offer

Seniority level: Mid-Senior level. Employment type: Full-time. Industry: IT Services and IT Consulting.