Frontend Engineer (Contract Basis)

EMPLOYMENT DETAILS

• Employment type: through 3rd party/ vendor
• Duration: 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.