Senior Frontend Engineer — High-Performance Web Apps

iTRTech Group; Portugal; On-site; EUR 30,000 - 33,000; Full time

Job summary

iTRTech Group seeks an experienced Frontend Developer to build and optimize high-traffic web applications in Portugal. You will focus on frontend performance, accessibility, modern development practices, and code quality to deliver scalable digital experiences.

You will implement SSR/CSR, participate in reviews and tests, and collaborate with teams to maintain frontend reliability. Strong HTML, CSS, and JavaScript, plus WCAG knowledge and CI/CD exposure, are valued.

Qualifications

• 5+ years of experience developing and maintaining production web frontends.
• Strong proficiency in HTML, CSS, JavaScript, HTTP, and browser fundamentals.
• Solid understanding of Server-Side Rendering (SSR) and Client-Side Rendering (CSR).
• Hands-on experience optimizing performance for high-traffic sites (Core Web Vitals, Lighthouse).
• Practical knowledge of WCAG accessibility standards.

Responsibilities

• Develop, maintain, and improve production-ready web frontend applications.
• Build responsive, accessible, high-performance user interfaces.
• Optimize website performance using Core Web Vitals, Lighthouse, and related tools.
• Apply SSR and CSR principles in daily work.
• Participate in code reviews, automated testing, and version control processes.

Skills

HTML/CSS/JS

Web performance

Accessibility (WCAG)

Git & code reviews

AI tools evaluation

English (B2+)

Portuguese (B2+)

Tools

React

TypeScript

SFCC / Demandware

Storefront Next / PWA Kit

SFRA

Job description

iTRTech Group seeks an experienced Frontend Developer to build and optimize high-traffic web applications in Portugal. You will focus on frontend performance, accessibility, modern development practices, and code quality to deliver scalable digital experiences.

You will implement SSR/CSR, participate in reviews and tests, and collaborate with teams to maintain frontend reliability. Strong HTML, CSS, and JavaScript, plus WCAG knowledge and CI/CD exposure, are valued.