OKX

Venture capital for blockchain startups

Senior / Staff Software Engineer - Multiple Teams

Mobile EngineeringConfirmed live in the last 24 hours

Full-timeHong KongNo salary listed

About the Job

Requirements

Deep, hands-on experience building native iOS and/or Android applications and understanding the platforms beyond frameworks built on top of them.
Experience with a cross-platform or shared business-logic layer; Rust-on-mobile experience is a strong plus, and experience with KMP, Flutter, or React Native is valued.
Fluency in at least one of Swift, Kotlin, Rust, Objective-C, Java, or JavaScript, with strong computer science fundamentals.
Architecture experience with large-scale mobile apps, including applying maintainable design patterns and owning solutions from requirements through production.
Hands-on experience with mobile authentication and security, including OAuth/OIDC, MFA, secure storage (Keychain/Keystore), and biometrics.
Passkey, WebAuthn, or FIDO2 experience is a strong advantage.
A solid grasp of threat modeling and the mobile attack surface.
Applying AI deeply in engineering; experience building, or motivation to build, automated development workflows and harnesses that improve delivery speed and reliability.
A solid grasp of LLM fundamentals, prompt engineering, retrieval-augmented generation (RAG), and agent concepts, with hands-on experience taking an AI pipeline from scratch to shipped.
Comfort with ambiguity and high scale, including debugging problems that arise under real production load.
Fraud or risk, cryptography, or regulated-industry (fintech) experience is a nice-to-have.
Experience with mini-program or dynamic/hot-update frameworks is a nice-to-have.
Crypto trading or Web3 experience is a nice-to-have.

Responsibilities

Own account-system subsystems end-to-end, including authentication, MFA, Passkey/WebAuthn, session and device trust, account registration, and recovery, covering architecture, tradeoffs, and long-term evolution.
Design secure, low-friction flows at millions-of-daily-active-users scale.
Partner with risk and security teams to turn threat models into shipped mobile defenses.
Build an AI-native engineering practice by designing automated development workflows and harness systems, including agents, evaluations, guardrails, and continuous-integration integration, that enable AI to do engineering work while safeguarding delivery quality and efficiency.
Raise engineering standards through design and code reviews and by improving the engineers around you.
At Staff level, set technical direction beyond the role's own subsystem and drive cross-team, cross-time-zone decisions that shape the account platform.

Desired Qualifications

Direct Rust-on-mobile experience is a strong plus.
Direct experience with Passkey, WebAuthn, or FIDO2 is a strong advantage.
Fraud or risk, cryptography, or regulated-industry (fintech) experience.
Experience with mini-program or dynamic/hot-update frameworks.
Crypto trading or Web3 experience.

OKX will be prioritising applicants who have a current right to work in Hong Kong, and do not require OKX's sponsorship of a visa.

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.

Notice:

All official OKX vacancies are published on this website. While roles may appear on selected third-party platforms from time to time, information on other sites may be inaccurate or outdated. If in doubt, please apply directly through our official careers website.

Information collected and processed as part of the recruitment process of any job application you choose to submit is subject to OKX's Candidate Privacy Notice.

About the Company

OKX

Venture capital for blockchain startups

OKX Ventures acts as the investment arm of the OKX cryptocurrency exchange, funding and supporting blockchain, DeFi, and Web3 projects. It invests across a wide range of areas—from infrastructure and middleware to applications and games—aiming to strengthen the crypto ecosystem. The firm provides capital and access to OKX’s network of partners and advisors to help portfolio companies grow and succeed. Notable holdings include Polygon, Solana, and Avalanche, reflecting a strategy focused on projects with potential to impact the crypto industry at large. OKX Ventures differentiates itself through its crypto-native perspective, extensive industry network, and active involvement in portfolio development, rather than just providing funding. Its goal is to identify promising projects and help them scale, contributing to a more robust and innovative blockchain ecosystem.

Company size: 5,001-10,000
Company stage: Not listed
Total funding: $1.1B
Headquarters: Singapore, Singapore
Founded: 2017

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