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# Front End Developer

- **Company:** SQLI
- **Location:** Barcelona, Spain
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Data Structures, Software Design Patterns, Performance Tuning, Next.js, TypeScript, Web Performance Optimization, ReactJS, Backend, Front End Software Development, React Redux, Api Management
- **Published:** August 28, 2026
- **Apply:** https://www.adzuna.es/contact-us.html

## About the Role

Who are you?
Proven experience coding in large ecommerce complex React or Next.Js projects.
Deep expertise in JavaScript/TypeScript and advanced design patterns.
Strong ability to optimize performance and manage rendering strategies (SSR, CSR, ISR).
Solid grasp of data structures and algorithms, and how they impact front-end performance.
Experience working with complex API integrations and modern state management (Zustand, Redux, TanStack, etc.).
Capable of mentoring other developers and reviewing code with a focus on quality and scalability.

## Description

We are looking for a front-end developer with proven experience in architecture and design patterns. Working autonomously, you he/she implement front-end scripting on high-impact projects, promoting best practices and ensuring the scalability and performance of our applications.
What is this all about?
Deploy all teams decisions in large-scale React/Next.Js applications.
Define and implement modern front-end patterns, rendering strategies, and scalable structures.
Collaborate with backend engineers, designers, and product managers to align architectural vision with business goals.
Guide performance optimization through SSR, CSR, and ISR strategies.
Contribute to design and implementation of complex API integrations and state management solutions.
Main Relationships
Frontend and Backend Developers
Product Owners & Managers
UX/UI Designers
QA Engineers
Business Stakeholders


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