About the role

Senior Full Stack Developer optimizing performance of embedded solutions on Stay22’s platform. Collaborating on development and maintenance of the core infrastructure.

Responsibilities

Continuously optimize script load times and execution efficiency (minification, caching, lazy loading).
Build reliable methods to inject content and widgets across different sites (DOM manipulation, dynamic layouts).
Develop precise event handlers to track user interactions with embedded elements.
Implement fingerprinting techniques to track user sessions while respecting privacy requirements.
Create and maintain Node.js/Python scrapers to collect data from partner sites or APIs, with fallback sources to ensure resilience.
Troubleshoot and adapt script logic for real-world conditions and handle conflicts with other third‑party scripts.
Oversee the full stack of embedded products (scripts, SDKs, APIs) and collaborate with teams to integrate new features.

Proficiency in English to collaborate with international colleagues.
Deep experience with vanilla JavaScript / ES6+ or TypeScript, without relying on frameworks (React/Vue not required).
Strong understanding of the event loop, DOM/CSSOM, and web performance optimization (FCP, LCP, etc.).
Proficiency with Node.js for APIs and scrapers; Python is a plus. Familiarity with HTTP, REST/JSON and proxies.
Understanding of fingerprinting techniques and privacy implications (cookies, sessions, CORS, GDPR).
Open source contributions or public GitHub projects are a plus.
Bachelor’s or Master’s degree in Computer Science or equivalent practical experience.

Comprehensive benefits: health, dental, retirement plans, training and development opportunities, social activities and team-building events, including memorable company retreats.