Staff Software Engineer, Mobile (P2P / Fiat)

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. 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.  

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 Opportunity

We are looking for a Staff Mobile Engineer to join our P2P & Fiat team, where you will own the mobile engineering for OKX's crypto fiat on/off-ramp experience across offshore and international markets. This is a high-ownership role at the intersection of mobile engineering and cross-border payments — you will build and scale the end-to-end fiat-to-crypto conversion journeys that serve users across Southeast Asia, LATAM, MENA, and beyond.

You bring hands-on experience building crypto on/off-ramp products, deep familiarity with cross-regional fiat payment integrations, and the technical discipline to own complex, multi-step transaction flows in a consumer-facing mobile product. You are also fluent in AI-assisted development and bring the rigour to build, maintain, and continuously improve your own AI engineering workflows.

What You'll Be Doing

• Own the mobile engineering for the crypto fiat on/off-ramp experience — including quote flows, payment method selection, transaction status, and failure handling end-to-end.
• Build and maintain cross-regional fiat payment integrations — including local bank transfers, e-wallets, and third-party PSP integrations across markets such as Southeast Asia, LATAM, and MENA.
• Ensure mobile payment flows and user data handling are compliant with offshore crypto market requirements — including KYC tiers, transaction limits, and regional regulatory constraints.
• Collaborate closely with compliance, legal, product, and regional market teams to translate local regulatory requirements into reliable, user-friendly mobile experiences.
• Drive technical decision-making on payment architecture, articulating trade-offs clearly across speed, maintainability, and compliance.
• Apply AI coding tools actively in your workflow — not just for code generation, but to build and maintain repeatable personal AI development workflows.
• Mentor engineers on the team and contribute to a culture of ownership, technical rigour, and high engineering standards.

What We Look For In You

• 5+ years of native iOS or Android development experience, with a track record of owning high-stakes, multi-step transaction flows in consumer-facing mobile products.
• Hands-on experience building crypto token on/off-ramp products targeting offshore or international markets.
• Deep familiarity with cross-regional fiat payment integrations — local bank transfers, e-wallets, and third-party PSPs across markets such as Southeast Asia, LATAM, or MENA.
• Strong understanding of the full fiat-to-crypto conversion UX — quote flows, payment method selection, transaction status, and failure handling.
• Aware of compliance considerations in offshore crypto markets — KYC tiers, transaction limits, and regional regulatory constraints.
• Proficient in AI-assisted development — deep hands-on use of Claude Code, Codex, or equivalent code models in daily workflow, with the ability to independently build and maintain a personal AI development workflow including prompt engineering, toolchain integration, and agentic coding.
• Strong cross-functional communication — comfortable working with compliance, legal, product, and regional market teams to hold the line on engineering quality.

Nice-To-Haves

• Experience in high-growth emerging markets where fiat accessibility is a key driver of crypto adoption.
• Experience integrating with specific PSPs or payment rails commonly used in Southeast Asia, LATAM, or MENA markets.
• Familiarity with anti-fraud mechanisms in P2P or fiat payment contexts.
• Experience operating across multiple regulatory environments simultaneously.
• Background in fintech, crypto, or regulated consumer financial products.

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!

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