About Ajaib
Founded to transform retail finance, Ajaib Group is an Indonesian fintech unicorn breaking barriers to financial access. Having recently secured a $270M Series C—the single largest funding round in Southeast Asia over the past four years—we are backed by premier global investors including Y Combinator, Ribbit Capital, SoftBank, and SBI Holdings.
To build world-class products, we assemble world-class talent. Supported by our fully remote work arrangement, our team spans Eastern Europe, the Middle East, India, and Southeast Asia, allowing you to work with brilliant engineers and builders from around the globe from wherever you are. We operate with an impact-driven purpose where everyone is the owner of our customers' satisfaction. Driven by a growth mindset and a fierce will to win, we refuse to settle and constantly push engineering boundaries.
Role Overview
Role Overview As a Staff Mobile Engineer at Ajaib, you represent the highest level of technical authority and individual contribution in our mobile organization. You will architect high-performance, resilient mobile applications serving millions of users across stock trading, crypto, and banking verticals. You will set architectural standards, drive mobile infrastructure design, eliminate performance bottlenecks, and mentor senior engineers across the mobile discipline.
• Architect, design, and scale high-performance, low-latency mobile client applications for high-frequency trading and fintech platforms.
• Drive the mobile engineering roadmap, establishing architectural patterns, modularization frameworks, and core SDK libraries.
• Optimize app rendering performance, minimize memory footprint, reduce APK/IPA size, and control battery/network consumption under intensive loads.
• Design offline-first data synchronization, secure local storage encryption, and resilient network caching mechanisms.
• Collaborate closely with backend architects, product leaders, and security teams to enforce end-to-end data safety and compliance.
• Mentor senior engineers, lead technical reviews, and champion elite mobile engineering execution and craftsmanship.
• Utilize AI tools critically with a "human-in-the-loop" framework to accelerate delivery without compromising code security or architecture integrity.
• Experience: Minimum 7+ years of professional software development experience with at least 5+ years dedicated to advanced native or cross-platform mobile architecture (Android/Kotlin or iOS/Swift).
• Architecture & Patterns: Deep expertise in clean architecture, modularization (feature modules), reactive programming, and state management at scale.
• Performance Tuning: Proven track record of profiling memory leaks, rendering jank, thread blocking, and optimizing network serialization/deserialization.
• Security & Storage: Extensive practical knowledge of secure local data storage (EncryptedSharedPreferences, Keychain/Keystore), certificate pinning, and obfuscation.
• Concurrency & Asynchronous Programming: Master practitioner of coroutines, reactive streams, or advanced asynchronous operations handling high-frequency data streams (e.g., real-time WebSocket ticker updates).
• Mindset: Exceptional autonomy, technical leadership, and an obsession with software craftsmanship and user experience.