Senior Lead Frontend Engineer

📌 EMPLOYMENT DETAILS Employment type: through 3rd party/ vendorDuration: 24 months fixed term (subject to change based on business needs)Work setup: Full onsite with dedicated full office hours based in BSD, Tangerang. The Role Senior Lead the architecture, development, and delivery of scalable, high-performance web applications across multiple product lines.Strategize the frontend roadmap in partnership with Product, Design, and Engineering leadership by defining standards, tooling choices, and long-term technical direction.Authorize technical decisions on frontend architecture, component system design, state management patterns, and build infrastructure.Synergize efforts across frontend, backend, design, and QA teams to ensure seamless, end-to-end user experiences.Negotiate trade-offs between design fidelity, performance, accessibility, and delivery timelines, providing clear recommendations to stakeholders.Lead code reviews, set engineering standards, and drive adoption of best practices across the frontend engineering team.Evaluate emerging frontend technologies and frameworks; recommend adoption where they meaningfully improve quality, performance, or developer experience.Use AI-assisted development tools thoughtfully for component implementation, refactoring, testing, and documentation while preserving accessibility and design fidelity.Formulate and enforce frontend performance budgets, accessibility standards, and cross-browser compatibility requirements.Lead the strategy for dependency management, package upgrades, security patches, and shared library maintenance.Mentor and grow mid and junior engineers through structured feedback, pairing, and technical guidance.Plan and control frontend delivery milestones, proactively surfacing risks and coordinating resolution across teams.Mid Plan and develop UI components and features by translating designs and wireframes into clean, maintainable, and reusable code.Control the quality of your own work through thorough testing, debugging, and adherence to team coding standards.Evaluate and implement responsive, cross-browser compatible layouts across desktop, tablet, and mobile breakpoints.Formulate and document component-level solutions that align with the team's frontend architecture and design system.Collaborate closely with Product Managers, Designers, Backend Engineers, and QA to deliver cohesive user experiences.Recommend improvements to code quality, component reusability, or development tooling based on day-to-day experience.Participate in code reviews, incorporating feedback constructively to improve personal and team output.Use AI-assisted coding tools where appropriate for UI implementation, debugging, test generation, and documentation, validating all output before delivery.Plan and execute frontend optimizations for performance, accessibility, and SEO under guidance from senior engineers.Contribute to dependency maintenance tasks including package upgrades and basic compatibility checks.Stay current with frontend trends and evaluate new tools or techniques relevant to the team's work. Requirements Senior 5+ years of hands-on experience in frontend engineering, with a demonstrable track record of shipping production-grade web applications at scale.Deep expertise in JavaScript (ES6+), TypeScript, HTML5, and CSS3, with strong understanding of browser internals and rendering performance.Proven mastery of React.js (preferred) or Vue.js / Angular, including advanced patterns such as server-side rendering, code splitting, and micro-frontends.Extensive experience with state management solutions (Redux, Zustand, Pinia, or equivalent) and frontend data-fetching strategies.Strong command of frontend build tooling (Webpack, Vite, Rollup) and CI/CD pipelines for frontend applications.Deep experience with performance optimization like Core Web Vitals, lazy loading, caching strategies, and bundle analysis.Proven ability to design and maintain scalable component libraries and design system integrations.Experience leading dependency governance: package upgrade strategies, compatibility management, and vulnerability remediation.Strong command of testing practices, unit, integration, and end-to-end testing (Jest, Cypress, Playwright, or equivalent).Familiarity with AI-assisted coding tools and the ability to review generated UI code for accessibility, responsiveness, maintainability, and design fidelity.Demonstrated ability to influence technical decisions and communicate clearly with non-technical stakeholders.Experience with RESTful and GraphQL API integration, including error handling and data normalization strategies.Good communication skills in both Bahasa Indonesia and English, written and spoken. Mid 2-4 years of hands-on experience in frontend development, with at least one project delivered in a professional or academic setting.Solid proficiency in JavaScript (ES6+), HTML5, and CSS3, with a good understanding of how browsers render pages.Hands-on experience with React.js, Vue.js, or Angular; familiarity with component-based architecture and props/state patterns.Basic experience with state management libraries (Redux, Zustand, Vuex, or equivalent).Familiarity with RESTful API integration and working with JSON data in frontend applications.Experience using Git and collaborative development workflows (branching, pull requests, code reviews).Understanding of responsive design principles and CSS frameworks (e.g., Tailwind CSS, Bootstrap, or similar).Familiarity with AI-assisted coding tools for UI development, testing, debugging, or documentation is an advantage.Familiarity with frontend build tools and package managers (Webpack, Vite, npm, or yarn).Basic awareness of web performance principles and browser developer tools for debugging.Understanding of package management, including installing dependencies and identifying outdated or vulnerable packages.Strong problem-solving mindset with attention to detail and willingness to learn.Good communication skills in both Bahasa Indonesia and English, written and spoken.