KingMakers

Senior Front-End Software Engineer, Apps Team

KingMakers

full-time

Posted on:

Location Type: Hybrid

Location: Madrid • Spain

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Job Level

Senior

Tech Stack

DockerGraphQLJavaScriptJestReactTypeScriptYarn

About the role

  • 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

  • 5+ years of professional experience in frontend development.
  • Experience with and strong interest in AI tools.
  • Strong expertise in React, TypeScript, JavaScript, HTML5, CSS, and Tailwind.
  • Experience integrating with REST APIs; GraphQL experience is a plus.
  • Familiarity with unit testing frameworks such as Jest or Vitest.
  • Deep understanding of frontend architectural patterns for building scalable applications.
  • Experience working with CMS platforms such as Strapi.
  • Knowledge of web hosting platforms like Cloudflare and Vercel.
  • Familiarity with package managers such as PNPM or Yarn.
  • Exposure to Application Performance Monitoring (APM) tools such as Kibana or Elastic.
  • Bonus / Nice-to-Have: Experience with high-volume transactional systems, fintech, or iGaming.
  • Experience in performance optimization, accessibility, and responsive design.
  • Familiarity with CI/CD pipelines and Docker.
Benefits
  • Hybrid work model (2 days onsite in our Madrid office, 3 remote).
  • 24 days of annual leave + public holidays.
  • Birthday day off.
  • Private health insurance with Alan (including dental & mental health).
  • Flexible compensation plan with Alan for meals and transport.
  • Discretionary annual bonus based on company and individual performance.
  • Additional paid leave for life events.
  • Regular team breakfasts, offsites, and local events.
  • Work with global teams across Nigeria, South Africa, Malta & the UK.
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
ReactTypeScriptJavaScriptHTML5CSSTailwindRESTful APIsunit testingJestfrontend architectural patterns