Jan 17
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Namaste, and welcome back to THE ENGINEER BHAI! Are you ready to level up your career and ace that Senior Frontend Engineer interview in 2026? The industry bar is rising. Hiring managers are no longer just looking for component builders—they want architects who deeply understand how to build web applications that are both lightning-fast and bulletproof secure. In this ultimate interview preparation guide, we break down the toughest, most critical questions senior-level developers will face, focusing on the two pillars of modern web development: Security and Performance. We dive deep into complex topics and show you exactly how to articulate your experience and design decisions like a true senior leader. You'll learn: 🛡️ Advanced Frontend Security (The Tough Questions) How would you implement and manage Content Security Policy (CSP) in a large-scale application? Explain the difference between XSS and CSRF, and provide multiple mitigation strategies for each. Discuss modern authentication flows (e.g., OAuth 2.1, PKCE) and the security trade-offs of storing tokens client-side. What are the security implications of using third-party scripts or micro-frontends? ⚡ Deep Performance Optimization (Core to Senior Roles) How do you use Core Web Vitals (LCP, FID/INP, CLS) to benchmark and prioritize performance work? Walk through your strategy for reducing initial load time (bundle size optimization, tree-shaking, code splitting). Beyond simple lazy loading, how do you manage resource loading order and critical path rendering? Describe how your team utilizes tools like Webpack Bundle Analyzer or Lighthouse for continuous performance monitoring. This isn't just about memorizing definitions—it's about demonstrating senior-level thinking on architecture, risk assessment, and technical leadership. Watch now and get ready to crush your next interview! Hit that like button if you’re working to level up your engineering skills, and subscribe to THE ENGINEER BHAI for more advanced tech guides! #FrontendInterview #SeniorEngineer #WebPerformance #WebSecurity #CoreWebVitals #JavaScript #ReactInterview #SystemDesign #2026Tech #THEENGINEERBHAI