Principal/Senior Mobile Engineer, Trading Strategies (CEX)

About the role

OKX is hiring a Principal/Senior Mobile Engineer for its Trading Strategies Mobile Team, which owns the Trading Bot and Copy Trading experiences across iOS and Android. The team builds strategy bots (Spot & Futures Grid, DCA, Recurring Buy, Smart Portfolio, Smart Arbitrage, Signal Bot, DCD and AI-powered bots) and lets users mirror top traders' positions. The codebase is built on a shared Rust/UniFFI core, and the role focuses on Android/iOS while also contributing to Copy Trading.

Key responsibilities

• Own the technical architecture and delivery of the Android/iOS Trading Bot codebase, and raise code quality, stability and performance across both surfaces.
• Lead large-scale technical initiatives end to end, including the Kotlin/Swift-to-Rust/UniFFI migration, modularization and binary-compatibility discipline, and the work to reduce crashes, ANRs and startup hotspots.
• Join product requirement discussions, shape technical solutions and partner with product and business on the Trading Bot roadmap, including AI-powered bot experiences.
• Mentor engineers, share knowledge and train the team, and explore integrating AI into business scenarios.

Required profile

• Staff/Principal level Android/iOS expertise, with 8+ years shipping production apps.
• Deep Kotlin and strong command of multi-module architecture, dependencies and binary-compatibility constraints.
• Track record of leading mid to large projects end to end on a large, legacy-heavy codebase.
• Trading or fintech background, with client-side experience in order placement, market data and asset management; automated or algorithmic trading is a strong plus.
• Influence and mentorship, able to lift the team's technical proficiency.

Required skills

• Platform performance tuning (ANR, crash, startup, memory)
• Nice to have: Rust, UniFFI/FFI, Swift/Obj-C, LLM fundamentals, prompt engineering, RAG, APM and tracing tools, CI/CD, monorepos, and client-side team leadership

What we offer

• Competitive total compensation package
• L&D programs and education subsidy
• Wellness and meal allowances
• Comprehensive healthcare schemes for employees and dependants