Senior Frontend Engineer: Craft Scalable, Secure UIs

SEIDOR; Brussel Hoofdstad; On-site; EUR 90,000 - 120,000; Full time

Job summary

SEIDOR in Brussels is seeking a Front-end Software Engineer with a strong track record in building scalable web applications. You will transform wireframes into high‑quality components, ensure performance, accessibility, and security, and collaborate with UX/UI designers to deliver exceptional user experiences.

Expect to work with modern frameworks (Angular/React/Vue), apply state management, implement tests, and contribute to code quality and documentation in a collaborative, international

Qualifications

• 12+ years of IT experience.
• 12 years of HTML5, JavaScript, ES6, and CSS3.
• 12 years building complex, modular client-side apps with modern frameworks and Web Components.
• 12 years developing responsive, adaptive design.
• 5+ years in front-end languages (HTML5, JS, ES6, CSS3) and front-end frameworks.

Responsibilities

• Develop and maintain responsive, scalable front-end web applications using modern frameworks and technologies.
• Design intuitive user interfaces and implement features that enhance user experience.
• Collaborate with UX/UI designers to translate wireframes into functional web components.
• Write clean, reusable, maintainable code following best practices.
• Implement state management solutions and ensure efficient data flow.

Skills

HTML5

JavaScript

ES6

CSS3

Web Components

State management

Testing

CI/CD

Security best practices

Front-end frameworks

Education

Degree in Computer Science or Engineering

Tools

Git

SVN

Bamboo

Jenkins

Angular CLI / Webpack / Vite

Job description

SEIDOR in Brussels is seeking a Front-end Software Engineer with a strong track record in building scalable web applications. You will transform wireframes into high‑quality components, ensure performance, accessibility, and security, and collaborate with UX/UI designers to deliver exceptional user experiences.

Expect to work with modern frameworks (Angular/React/Vue), apply state management, implement tests, and contribute to code quality and documentation in a collaborative, international