Ajaib Group, an Indonesian fintech company, was founded to transform retail finance and has become a fintech unicorn in Indonesia, breaking barriers to financial access. The company recently secured a $270M Series C funding round—the largest in Southeast Asia over the past four years—with investors including Y Combinator, Ribbit Capital, SoftBank, and SBI Holdings. Ajaib operates with a fully remote work arrangement, with team members across Eastern Europe, the Middle East, India, and Southeast Asia. As a Staff Mobile Engineer at Ajaib, you will represent the highest level of technical authority and individual contribution within the mobile organization. You will architect high-performance, resilient mobile applications serving millions of users across stock trading, crypto, and banking verticals. Responsibilities include setting architectural standards, driving mobile infrastructure design, eliminating performance bottlenecks, and mentoring senior engineers. You will architect, design, and scale high-performance, low-latency mobile client applications for high-frequency trading and fintech platforms; drive the mobile engineering roadmap by 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 with backend architects, product leaders, and security teams to enforce end-to-end data safety and compliance; mentor senior engineers and lead technical reviews; and utilize AI tools critically with a "human-in-the-loop" framework to accelerate delivery without compromising code security or architecture integrity. Requirements include a minimum of 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), deep expertise in clean architecture, modularization (feature modules), reactive programming, and state management at scale, a proven track record of profiling memory leaks, rendering jank, thread blocking, and optimizing network serialization/deserialization, extensive practical knowledge of secure local data storage (EncryptedSharedPreferences, Keychain/Keystore), certificate pinning, and obfuscation, mastery of coroutines, reactive streams, or advanced asynchronous operations handling high-frequency data streams (e.g., real-time WebSocket ticker updates), and exceptional autonomy, technical leadership, and a commitment to software craftsmanship and user experience. Benefits include a performance bonus based on impact, comprehensive private health insurance, paid time off, company-sponsored training, courses, and professional certifications, a hybrid work arrangement with the flexibility to work remotely or from the office, career growth through close collaboration with experienced leaders and meaningful ownership, exclusive discounts and lifestyle perks, and a collaborative, high-ownership culture across cross-functional teams.

Staff Mobile Engineer

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