Senior JavaScript Engineer

Airslate

Poland Remote permanent

Posted: February 24, 2026

Required Skills

Job Description

About the Marketing Engine team:
The marketing team handles comprehensive 360º communication and comprises over 150 people. We manage all aspects in-house and operate a robust automation engine. Our combined monthly traffic across all brands exceeds 31 million. As a marketing team member, you'll play a crucial role in the upcoming phase of our brand's growth as we expand and introduce new products to the market.

And now, we are looking for a Senior JavaScript Engineer who is prepared to contribute to the next chapter of our company's growth.

What you'll be working on: :
• Develop and deliver new product features from concept to release
• Maintain, improve, and refactor existing functionality to ensure scalability and reliability
• Continuously enhance product performance and user experience
• Collaborate closely with Product and Design teams to iterate on ideas and transform prototypes into high-quality solutions
• Optimize application performance, including load time and runtime efficiency
• Partner with engineering teams across the organization to align on architecture and shared initiatives

What we expect from you::
• 5+ years of professional experience building production-grade applications with TypeScript/JavaScript
• Advanced experience with React, including modern rendering patterns (SSR, CSR, hydration, Server Components)
• Hands-on experience with Next.js
• Experience building and maintaining reusable component libraries and design systems, including Web Components
• Solid experience developing Single-Page Applications and scalable frontend systems
• Strong foundation in modern CSS/SCSS and utility-first styling approaches
• Deep understanding of client-side architecture (state management, data synchronization, form handling, validation patterns)
• Experience delivering performant, accessible (WCAG-compliant), and production-ready user interfaces
• Ability to write maintainable, testable, and reliable code
• Comfortable working in collaborative, Git-based environments
• Takes ownership of work, proactively addresses dependencies, and supports team delivery
• Demonstrates curiosity, continuous learning, and knowledge sharing

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