Senior Frontend Engineer

Aleph Group; Madrid; Presencial; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A leading digital advertising firm in Madrid is seeking a Senior Frontend Engineer to design and maintain high-performance web applications. The ideal candidate will have over 5 years of experience, expertise in JavaScript frameworks, and a passion for user-centric design. This role involves significant contribution to architectural decisions and mentoring other engineers, offering an opportunity to make a substantial impact in a fast-paced environment.

Formación

• 5+ years of experience in front-end software development.
• Experience with designing and building complex web applications and single-page applications.
• Expertise with at least one major JavaScript framework.
• Proficient in JavaScript/TypeScript, HTML5, and CSS3.

Responsabilidades

• Design, develop, and maintain front-end architectures.
• Write high-performance code in JavaScript/TypeScript.
• Manage front-end build and deployment pipelines.
• Implement performance optimizations for user experience.
• Mentor junior developers and conduct code reviews.

Conocimientos

Frontend development

JavaScript/TypeScript

React

Angular

Vue.js

Herramientas

Webpack

Vite

CI/CD

Jest

React Testing Library

Cypress

Descripción del empleo

Are you ready to join our digital revolution journey?

At Aleph, we’re not just part of the digital advertising landscape—we’re shaping its future. Representing the world’s leading platforms, including TikTok, Amazon, Google, and nearly 55 others, we operate in 130+ markets across new and existing geographies.

Our mission is to empower advertisers and brands to unlock the full potential of these platforms' advertising capabilities. By fostering long‑lasting partnerships, we create limitless opportunities for people and businesses to advertise effectively at both local and global levels.

With a presence spanning continents, Aleph offers you the chance to be part of a fast‑growing, innovative team where your work makes a direct impact. If you’re ambitious, forward‑thinking, and eager to thrive in a dynamic, global environment, Aleph is the perfect place to build your career.

We are seeking an experienced Senior Frontend Engineer who specializes in designing, building, and operating high‑performance, user‑centric web applications. In this role, you will be a key contributor to our core platform, making critical architectural decisions and mentoring other engineers. You’ll be responsible for ensuring our user interfaces are intuitive, responsive, and visually appealing, and that our entire ecosystem provides a seamless user experience. If you are passionate about modern JavaScript frameworks, UI/UX best practices, and the patterns that make web applications work, this is the role for you.

Responsibilities

• Architect & Design: Design, develop, and maintain scalable and resilient front‑end architectures and user interface components.
• Build & Implement: Write clean, high‑performance code in JavaScript/TypeScript, utilizing modern frameworks like React, Angular, or Vue.js. Implement performance optimization (code splitting, lazy loading).
• Manage Infrastructure: Own and operate the front‑end build and deployment pipelines (e.g., Webpack, Vite, CI/CD).
• Ensure Reliability: Implement robust error handling, testing strategies (unit, integration, E2E), and performance optimizations to guarantee a smooth user experience.
• Observability: Instrument applications with metrics, logs, and traces to ensure visibility and rapid troubleshooting in a complex distributed environment.
• Mentorship & Leadership: Mentor mid‑level and junior developers, conduct code reviews, and champion best practices for front‑end development.
• Collaboration: Work closely with product managers, backend engineers, and UI/UX designers to build cohesive and powerful features.

Required Skills

• 5+ years of professional experience in front‑end software development.
• Deep, hands‑on experience with designing and building complex web applications and single‑page applications (SPAs).
• Proven expertise with at least one major JavaScript framework, such as React, Angular, or Vue.js.
• Strong proficiency in JavaScript/TypeScript, HTML5, and CSS3, with a solid understanding of responsive design and cross‑browser compatibility.
• Experience with state management libraries (e.g., Redux, MobX, NgRx) and asynchronous programming.
• Practical experience with front‑end testing frameworks (e.g., Jest, React Testing Library, Cypress).

Why Join Us?

Aleph is a place of many cultures, perspectives, and talents. We support each other, creating an environment of giving and receiving. We value partnership and communication because we believe it takes a group of people to achieve great things. We are energized by our ever‑changing industry, our curiosity keeps us learning and seeking out new opportunities.

We stay flexible and adaptable, and believe in moving with the speed of change. We encourage everyone to strive for more, providing our internal talent with growth opportunities and the ability to learn together.

“Share our similarities, celebrate our differences.” – M. Scott Peck

#ALEPH