Senior / Staff Software Engineer, Mobile — Core (Account & Risk)

OKX · Hong Kong, Hong Kong SAR · 1 week ago

Seniority: Staff
Category: Software engineering
Visa sponsorship: No
Company size: 1000+

ai android authentication backbone blockchain cryptography design-patterns fintech flutter

Who We Are

At OKX, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom.

OKX is a leading crypto exchange, and the developer of OKX Wallet, giving millions access to crypto trading and decentralized crypto applications (dApps). OKX is also a trusted brand by hundreds of large institutions seeking access to crypto markets. We are safe and reliable, backed by our Proof of Reserves.

Across our multiple offices globally, we are united by our core principles: We Before Me, Do the Right Thing, and Get Things Done. These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er.

OKX is part of OKG, a group that brings the value of Blockchain to users around the world, through our leading products OKX, OKX Wallet, OKLink and more.

About The Team

Own the account backbone of a CeFi platform trusted by millions — login, registration, account security, MFA, Passkey — where a single security regression is measured in real user funds. The more senior you are, the more you set the technical direction others build on.

What You'll Be Doing

Own account-system subsystems end-to-end — authentication, MFA, Passkey/WebAuthn, session & device trust, account registration and recovery — including architecture, tradeoffs, and long-term evolution.
Design flows that are secure and low-friction at millions-of-DAU scale — the hardest tradeoff in this space.
Partner with risk & security teams to turn threat models into shipped mobile defenses.
Build our AI-native engineering practice — design automated development workflows and harness systems (agents, evals, guardrails, CI integration) that let AI do real engineering work, while safeguarding delivery quality and efficiency.
Raise the bar through design and code review, and by making the engineers around you better.
At the Staff level: set technical direction beyond your own subsystem and drive cross-team, cross-timezone decisions that shape the account platform.

What We Look For In You

Deep, hands-on experience building native iOS and/or Android — you understand the platform, not just a framework on top of it.
Experience with a cross-platform / shared business-logic layer. We build ours in Rust + UniFFI; direct Rust-on-mobile experience is a strong plus, but experience with any shared-logic approach — KMP, Flutter, or React Native — transfers well and is valued.
Fluent in at least one of: Swift / Kotlin / Rust / Objective-C / Java / JavaScript, with strong CS fundamentals.
Architecture experience with large-scale mobile apps — you've applied maintainable design patterns and own solutions from requirements through to production.
Hands-on with mobile authentication & security — OAuth/OIDC, MFA, secure storage (Keychain/Keystore), biometrics. Direct experience with Passkey / WebAuthn / FIDO2 is a strong advantage — it's live in our stack and central to what you'll work on.
Solid grasp of threat modeling and the mobile attack surface.
You apply AI deeply in your own engineering — not just code generation. You've built, or are driven to build, automated development workflows and harnesses that make delivery both faster and more reliable. Solid grasp of LLM fundamentals, prompt engineering, RAG, and agent concepts, with hands-on experience taking an AI pipeline from scratch to shipped.
Comfortable with ambiguity and high scale — you've debugged problems that only appear under real production load.
Signals we value: you naturally raise the standard of teams you join, mentor without being asked, and can grow into a technical anchor for the group.

Nice-To-Haves

Fraud / risk, cryptography, or regulated-industry (fintech) experience.
Experience with mini-program or dynamic/hot-update frameworks.
Crypto trading / Web3 experience.

Perks & Benefits

Competitive total compensation package
L&D programs and Education subsidy for employees' growth and development
Various team building programs and company events
Wellness and meal allowances
Comprehensive healthcare schemes for employees and dependants
More that we love to tell you along the process!

Please note that Hong Kong is a group-level service hub, and OKX does not carry on a business of operating a virtual asset trading platform in Hong Kong.

Senior / Staff Software Engineer, Mobile — Core (Account & Risk)

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