Staff Mobile Engineer

PT Ajaib Sekuritas Asia; Jakarta Pusat; Remote; IDR 420,000,000 - 780,000,000; Full time

Benefits offered by this job

Performance Bonus

Private Insurance

Paid Time Off

Learning & Development

Hybrid Work Arrangement

Career Growth

Employee Perks

Collaborative culture

Job summary

Ajaib is seeking a Staff Mobile Engineer to set architectural standards and guide the mobile platform across stock trading, crypto, and banking verticals. You will architect high-performance, low-latency apps and mentor senior engineers, delivering scalable, secure mobile experiences for millions of users.

You will own the mobile roadmap, drive modular patterns, optimize rendering and memory, and collaborate with backend, product, and security teams to ensure end-to-end data safety and

Qualifications

• 7+ years in software development; 5+ years in mobile architecture.
• Deep expertise in clean architecture, modularization, reactive programming, and state management at scale.
• Experience with secure local data storage and certificate pinning.
• Proficiency with asynchronous programming and real-time data streams.

Responsibilities

• Architect, design, and scale high-performance mobile apps for trading and fintech.
• Drive the mobile engineering roadmap, architecture patterns, and core SDK libraries.
• Optimize rendering, memory usage, APK/IPA size, and battery/network efficiency under heavy loads.
• Design offline-first data synchronization and secure local storage.
• Collaborate with backend, product, and security teams to enforce end-to-end data safety and compliance.
• Mentor senior engineers, lead technical reviews, and promote craftsmanship.

Skills

Autonomy

Technical leadership

User experience focus

Tools

Android/Kotlin

iOS/Swift

Cross-platform (React Native / Flutter)

Job description

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.

• Performance Bonus - Get rewarded for the impact you make
• Private Insurance - Comprehensive health coverage for you
• Paid Time Off - Take the time you need to recharge and come back stronger
• Learning & Development - Company-sponsored training, courses, and professional certifications
• Hybrid Work Arrangement - Enjoy the flexibility of working both remotely and from the office
• Career Growth - Work closely with experienced leaders and take on meaningful ownership as we scale
• Employee Perks - Enjoy exclusive discounts, partnerships, and lifestyle perks
• Collaborative & High-Ownership Culture - Work with smart, driven people in cross-functional teams, take ownership, and make a meaningful impact for ou