Senior Front-End Engineer (Next.js 16+) at Splash Software

Bucharest, , Romania -

Full Time

Start Date

Immediate

Expiry Date

08 Jun, 26

Salary

0.0

Posted On

10 Mar, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Next.js 16+, React Server Components, TypeScript, Performance Optimization, Accessibility, Streaming, PPR, Caching Strategies, Server Actions, React Hooks, Web Vitals, RSC Security, Design Systems, Code Reviews, Edge Runtimes, State Management

Industry

Software Development

Description

Role Overview We are seeking a Senior Front-End Engineer with deep expertise in Next.js 16+ to architect and deliver high-performance, secure, and scalable web applications. The ideal candidate has 5+ years of effective front-end experience working on complex, production-grade systems and demonstrates strong ownership of architecture, performance, and browser-level behavior. Core Responsibilities Architect and develop large-scale applications using Next.js 16+ (App Router). Design systems and reusable component libraries aligned with accessibility and scalability standards. Implement modern rendering strategies (static, dynamic, streaming, PPR). Leverage Cache Components ("use cache"), revalidateTag(), updateTag(), and cache invalidation strategies effectively. Optimize navigation and prefetching strategies (layout deduplication, incremental prefetch). Integrate and optimize RESTful APIs with proper caching, error handling, and data consistency. Apply advanced browser performance optimization (hydration control, critical rendering path, reflow/repaint minimization). Ensure security best practices across Server and Client Components (XSS, CSRF, auth boundaries, RSC attack surface awareness). Collaborate with backend and DevOps teams on CDN, edge runtime, and caching-layer strategies. Lead code reviews, mentor engineers, and define engineering standards. Required Technical Expertise - Next.js 16+ App Router architecture React Server Components (RSC) Client/Server boundary management (use client) Server Actions Advanced SEO techniques Cache Components ("use cache") Data cache control (revalidateTag, updateTag) Streaming & Suspense Partial Prerendering (PPR) Route groups, parallel routes, loading/error boundaries Proxy model (proxy.ts) Edge vs Node runtimes Advanced state management - React & TypeScript Advanced React patterns Hooks, context, composition patterns React Compiler awareness Strong TypeScript typing patterns for large codebases - Performance & Tooling Bundlers and build optimization Bundle analysis & performance profiling Hydration debugging & mismatch resolution Web Vitals optimization Lazy loading & code splitting strategies - Browser & Web Fundamentals Deep understanding of: o Event loop & task queues o Rendering lifecycle (layout, paint, compositing) o Memory management o Network layers & HTTP caching Accessibility (WCAG compliance) Modern CSS architecture & scalable styling systems - Security Secure RSC boundaries API layer protection Secure headers & CSP Authentication/authorization flows Awareness of framework-level vulnerabilities and patch management Experience Requirements Minimum 5 years of professional front-end development experience Proven involvement in complex, high-traffic, or mission-critical applications Demonstrated ownership of architectural decisions and performance improvements Experience building and maintaining design systems in production. Preferred Familiarity with distributed caching strategies (CDN, edge caching) CI/CD and deployment optimization experience Backend familiarity (Node.js, NestJS, or similar)

Responsibilities

The role involves architecting and developing large-scale, high-performance web applications primarily using Next.js 16+ App Router, focusing on modern rendering strategies and component library design. Key duties include implementing advanced caching mechanisms, optimizing browser performance, ensuring security across component boundaries, and leading code reviews.