Senior JavaScript Developer

Role: Freelance Senior JavaScript Developer

Location: 100% Remote – Germany preffered

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)

We’re looking for an experienced Senior JavaScript Developer to join a fully remote, cross-functional team working on a privacy-focused file management platform. In this role, you’ll be responsible for delivering secure, scalable frontend experiences, developing new features and UI components, and enhancing workflows across our web platform.

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:

• Advanced proficiency in JavaScript/TypeScript (v5.6.3), React (v18.3.1), and HTML/CSS
• 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