Senior Frontend Engineer

Job Description

• Design, build, and maintain high-quality frontend applications with strong emphasis on performance, scalability, and reliability.
• Lead architectural decisions and collaborate closely with cross-functional teams (Backend, Product, Design).
• Drive optimization initiatives across Web Vitals (FP, LCP, CLS, INP) to ensure best-in-class user experience.
• Debug, diagnose, and resolve complex issues using advanced dev tools (memory profiling, network analysis, Lighthouse, etc.).
• Implement and maintain SSR/SSG frameworks to support SEO and content performance.
• Oversee CI/CD pipelines and ensure smooth delivery across environments via GitLab.
• Champion frontend best practices, code quality, and maintainability through reviews, testing, and documentation.
• Provide technical leadership, mentorship, and guidance to junior and mid-level engineers.
• Collaborate in building customer experience-driven features with strong focus on usability and responsiveness.

Requirements

• Bachelor's degree in Information Technology, Computer Science, Informatics Engineering, Information Systems, or a related field.
• 6+ years of hands-on experience in modern JavaScript development, from fundamentals to advanced concepts such as Closures, Currying, Promises, and custom Polyfills.
• Strong expertise in React.js, with the ability to build scalable, customer-experience-driven interfaces.
• Practical experience with Node.js for building performant services and integration layers.
• Proficient in bundling and build optimization using Webpack and Gulp.
• Solid understanding of HTML5, modern CSS practices, and CSS Modules for modular component styling.
• Experience with GitLab CI/CD to support automated build, test, and deployment pipelines.
• Deep focus on performance optimization, including auditing and improving Web Vitals (FP, LCP, CLS, INP).
• Skilled in debugging and profiling large-scale applications using browser DevTools — Memory, Network, and Lighthouse.
• Experience with SSR/SSG architectures and rendering strategies.
• Exposure to customer experience engines and ability to translate CX requirements into UI behavior.
• Understanding of SEO fundamentals and how it influences SPA, SSR, and content rendering.
• Experience with unit testing using React Testing Library (RTL).
• Familiarity with ESLint, SonarQube, and Cypress for code quality and automation.
• Understanding of logging, monitoring, and observability practices in modern front-end systems.
• Experience working with both monolithic and micro-frontend application structures.
• Basic knowledge of Docker and Kubernetes concepts (pods, CPU/memory usage, lightweight deployments).
• Demonstrated leadership and mentoring capability, with the ability to guide junior developers.

Why Astra Digital Mobil

• Join a dynamic team at Indonesia's premier classified and used car platform, serving an impressive 9 million monthly active users.
• Lead the enhancement and optimization of a diverse ecosystem comprising over 180 plus services.
• Engage with state-of-the-art technologies to drive innovation and excellence.
• Collaborate with global teams spanning across India and Indonesia, fostering a rich, diverse and growth oriented work environment.
• Thrive in an agile and adaptable workplace culture that promotes creativity and growth.