Senior UI/UX Engineer

Lancesoft APAC; Indonesia; On-site; IDR 240,000,000 - 360,000,000; Full time

Job summary

Lancesoft APAC is seeking a Senior UI/UX Engineer in Indonesia to own end-to-end mobile design for a telecom platform. You will craft intuitive iOS and Android experiences, from flows to high-fidelity interfaces, and drive cross-functional collaboration with engineers and product teams.

The role emphasizes rigorous usability testing, strong design systems, and data-driven refinement of navigation and interactions across mobile apps.

Qualifications

• Minimum 5 years of dedicated UI/UX design experience for mobile applications.
• Expert-level skills in Figma, including auto-layout, components, and interactive prototyping.
• Understanding of iOS/Android design patterns and Material Design.

Responsibilities

• Own the native iOS and Android design lifecycle from flows to high-fidelity interfaces.
• Design mobile-first journeys for features like top-ups, eSIM onboarding, and live usage tracking.
• Conduct user testing, A/B experiments, and usability audits to validate designs.
• Maintain and expand mobile design systems in line with iOS Human Interface Guidelines and Material Design.
• Collaborate with Mobile Engineers and Product Managers to ensure design fidelity and feasibility.
• Analyze app analytics to refine navigation and conversions.

Skills

Mobile UI/UX design

Figma

Mobile app design

Tools

Figma

Job description

Senior UIUX Engineer

Job Description

About the Role

We are seeking a Senior UI/UX Engineer with at least 5 years of hands-on experience crafting intuitive iOS and Android applications for our telecommunications platform. In this role, you will own the end-to-end mobile experience-transforming complex subscriber workflows like plan top-ups, eSIM activations, and real-time usage tracking into effortless, high-performing mobile app features.

Key Responsibilities

• Mobile Product Design: Own the native iOS and Android design lifecycle, from user flows and wireframes to interactive prototypes and high-fidelity interfaces
• Telecom App Workflows: Design seamless mobile-first journeys for core utility features, including instant bill payments, data package purchases, eSIM onboarding, and live support
• User Research & Usability: Conduct user testing, A/B experiments, and mobile usability audits to validate feature designs and reduce app drop-off rates
• Mobile Design Systems: Maintain and expand our mobile component library in compliance with iOS Human Interface Guidelines and Material Design (Android) standards
• Cross-Functional Handoff: Collaborate directly with Mobile Engineers (iOS/Android/Flutter) and Product Managers to ensure design fidelity and technical feasibility
• App Performance Optimization: Leverage app analytics (e.g., user session recordings, funnel analytics) to continuously refine navigation, micro-interactions, and conversion loops

Person Specifications

• Experience: Minimum 5 years of dedicated UI/UX design experience for mobile applications (native iOS/Android or cross-platform), ideally within telecom, fintech, or high-volume consumer apps
• Tooling Expertise: Expert-level skills in Figma (auto-layout, components, interactive prototyping) and mobile-focused handoff tools
• Mobile Design Standards: Deep understanding of gesture-based navigation, touch-target standards, responsive layouts, and native platform patterns
• Problem-Solving: Demonstrated ability to turn complex backend telecom logic into clean, minimal, and accessible mobile interfaces
• Portfolio: A portfolio showcasing real-world mobile app designs, end-to-end UX rationale, and visual polish