Senior Front-End Engineer (React/Next.js) – Hybrid & Mentoring

Coolblue; Rotterdam; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Monthly drinks

Snacks on site

Company parties

Hybrid work arrangement

Desk chair & home office setup

Travel allowance

Retirement plan

25 leave days

Office near Rotterdam

Coolblue University courses

Product discount

Job summary

Coolblue seeks an experienced Senior Front-End Developer to lead UI implementation using React/Next.js and contribute to full‑stack work in TypeScript and C#. You will mentor teammates, influence architecture, and ensure excellent user experiences.

You will collaborate with UX designers, participate in CI/CD, and help shape best practices in a dynamic, international team. This role blends strong front-end focus with practical back-end collaboration.

Qualifications

• 5+ years of experience as a Front-end React/Next.js Developer.
• Strong experience with TypeScript, React.js, Next.js.
• Proficient in modern JavaScript, HTML and CSS/SCSS.
• Experience mentoring teams and making technical decisions.
• Familiar with Scrum/Agile software processes.
• Fluent in English.
• Residence in The Netherlands.

Responsibilities

• Lead development of performant, user-friendly UI components using React.js and Next.js.
• Collaborate with UX Designers to deliver high-quality user experiences.
• Contribute to back-end logic when needed (Node.js or C# .NET).
• Make architectural and tooling decisions and ensure maintainability and performance.
• Mentor junior and medior developers and share knowledge.
• Participate in CI/CD and testing to uphold software quality.

Skills

React/Next.js

TypeScript

JavaScript (ES2017+)

HTML/CSS/SCSS

Mentoring

Agile/Scrum

English

Leadership

Education

BSc/MSc in Computer Science or related field

Tools

Node.js

C# (.NET)

Job description

Coolblue seeks an experienced Senior Front-End Developer to lead UI implementation using React/Next.js and contribute to full‑stack work in TypeScript and C#. You will mentor teammates, influence architecture, and ensure excellent user experiences.

You will collaborate with UX designers, participate in CI/CD, and help shape best practices in a dynamic, international team. This role blends strong front-end focus with practical back-end collaboration.