Senior JavaScript Developer

Montash; Düsseldorf; Vor Ort; EUR 60.000 - 85.000; Vollzeit

Zusammenfassung

A leading company is looking for a frontend developer to lead the end-to-end development of customer-facing web applications. The role involves collaboration with backend engineers and product teams, focusing on API integration and responsive design principles. Candidates should have strong skills in building scalable UI components and clean user experiences.

Qualifikationen

• Proven experience leading end-to-end development of complex web applications.
• Strong understanding of API integration and frontend architecture.

Aufgaben

• Contribute to both architectural decisions and hands-on development.
• Collaborate closely with backend engineers and product teams.

Kenntnisse

API integration

Frontend architecture

Responsive design

Semantic HTML

CSS styling

Building scalable UI components

Jobbeschreibung

Contract Type : Freelance / B2B

Contract Length : 6 months (+ extensions)

Start Date : July 2025

Work Schedule : EU or UK candidates considered

Interview process : 2 Stage (Including live technical assessment)

This is a customer-facing, product-focused role where performance, responsiveness, and clean user experience are top priorities. You’ll contribute to both architectural decisions and hands-on development, collaborating closely with backend engineers and product teams.

Key Skills :

• Proven experience leading end-to-end development of complex web applications
• Strong understanding of API integration and frontend architecture

Bonus Skills :

• Experience working on customer-facing products (web and / or mobile)
• Skilled in integrating and managing API endpoints , including validation and error handling
• Ability to build scalable, reusable UI components and improve existing workflows
• Familiarity with cryptography principles (e.g., symmetric / asymmetric encryption)
• Knowledge of Web Workers and Service Workers

Tech Stack & Focus Areas :

• Frontend Development : Expertise in semantic HTML, CSS styling, and responsive design principles
• API Integration : Comfortable with request lifecycles, status code handling, and tools like AbortController
• Advanced Frontend Concepts : Practical experience with debouncing, memoization, error boundaries, unit testing, and mocking strategies