Frontend Architect / Senior Engineer (вакансія неактивна)

Senior Front End Engineer
Full-time, remote | Long-term collaboration | Start: ASAP

Engagement model: Monthly retainer
Time zone overlap: CET ±2h

About the role:
We’re looking for a Senior Front End Engineer with deep browser knowledge and strong architectural skills;
You’ll join a team building secure, high-performance, and scalable interfaces from scratch or refactoring existing ones;
This role combines performance engineering, clean UI architecture, and technical leadership;

Your responsibilities will include:
● Architecting and building modern user interfaces with JS/TS, HTML5, and CSS3;
● Choosing between vanilla JS and frameworks based on project needs and scale;
● Profiling, debugging, and optimizing JS execution, memory, and rendering;
● Leveraging devtools to diagnose bottlenecks (initial load, paint, runtime);
● Leading code reviews and mentoring engineers across levels;
● Translating UX and product ideas into maintainable and accessible UI code;
● Collaborating with design, backend, and product teams on complex challenges.
● Exploring and adopting new frontend technologies and security best practices.

What we expect from you:
● Expert knowledge of JavaScript (ES6+) and async patterns;
● Solid understanding of V8 engine internals, event loop, memory management;
● Deep knowledge of DOM, CSSOM, layout, paint, and browser rendering pipeline;
● Experience with browser storage (localStorage, IndexedDB) and security policies (SOP, CORS, CSP);
● Proven experience optimizing frontend performance (lazy loading, tree shaking, code splitting);
● Strong grasp of networking: HTTP/2/3, TCP/IP, DNS — and how it impacts FE;
● Framework fluency (React, Vue, Svelte, or Angular) — and knowing when not to use one;
● Accessibility-first and mobile-first mindset;
● Experience with testing (Jest, Cypress), bundlers (Webpack, Vite, esbuild), CI/CD;
● Ability to write clean documentation, give actionable feedback, and elevate code quality;
● 5+ years of experience shipping large-scale web applications.

Bonus points if you have:
● Experience with PWAs, service workers, advanced browser APIs;
● Built performance-critical apps used in high-traffic environments;
● Worked with design systems or UI component libraries;
● Experience with user event tracking and identity management.

You’re a great fit if you:
● Are passionate about web performance, browser internals, and UI architecture;
● Balance pragmatism with code elegance;
● Can drive frontend strategy while staying hands-on;
● Don’t just write features — you solve problems.