Senior Mobile Engineer (Card & Payment)

OKX; San Jose (CA); On-site; USD 179,000 - 268,000; Full time

Benefits offered by this job

Competitive compensation package

Education subsidy for growth

Team building programs

Wellness and meal allowances

Healthcare for employees and dependers

Job summary

OKX is seeking a Senior Mobile Engineer to own and optimize the global card issuance lifecycle. You will work closely with product and engineering teams in the US and regularly engage Asia teams to align requirements and delivery.

Expect highly self-driven ownership and a willingness to learn across languages and platforms. You will build with Swift, Kotlin, or Rust, leverage AI tools, and contribute to hiring and improving team practices while ensuring security, reliability, and maintainability

Qualifications

• Proven experience shipping and operating production-quality mobile applications.
• Strong proficiency in at least one of Swift, Kotlin, or Rust, with willingness to learn in unfamiliar stacks.
• Outstanding ownership, self-direction, and pragmatic decision-making.
• Regular use of AI coding tools with measurable impact on delivery speed and quality.

Responsibilities

• Own the end-to-end global card issuance process—from eligibility and application through card creation, activation, provisioning, and lifecycle servicing.
• Learn the card issuing and payment domains deeply, translating requirements into architecture and delivery plans.
• Own features from discovery through production with emphasis on security, reliability, observability, and testing.
• Drive ambiguous, cross-functional initiatives to completion with ownership and sound judgment.
• Collaborate with US and Asia teams to align requirements and delivery.
• Build with Swift, Kotlin, or Rust and learn new languages and tools as needed.
• Use AI tools throughout the lifecycle from exploration to documentation, maintaining engineering judgment.
• Build reusable AI workflows and engineering harnesses to improve team speed and quality.
• Review code, share context, mentor teammates, and support team outcomes.

Skills

Mobile app development

iOS/Android expertise

Swift/Kotlin/Rust

Ownership & leadership

AI coding tools usage

Education

B.S./M.S. in Computer Science or equivalent

Tools

Swift

Kotlin

Rust

Job description

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:

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

Our Card and Payment engineering team builds reliable, intuitive experiences at the intersection of cards, payments, crypto, and global financial infrastructure. We partner closely with product, design, backend, risk, compliance, and business teams to make card and payment products accessible to users around the world. As a Senior Mobile Engineer on the Card and Payment team, your primary responsibility will be to own and improve the global card issuance process. You will work mainly with product and engineering partners in the US, while meeting regularly with teams in Asia to understand requirements and align delivery. We are looking for someone who is highly self-driven, takes real ownership, collaborates well, and is eager to learn the card issuing and payment businesses in depth.

What You’ll Be Doing

• Own the end-to-end global card issuance process—from eligibility and application through card creation, activation, provisioning, and lifecycle servicing—and improve the experience as OKX expands into new markets.
• Learn the card issuing and payment domains deeply, and translate business, user, payment, and regulatory requirements into sound architecture, clear trade-offs, and executable delivery plans.
• Own features from discovery through production, with a strong focus on security, reliability, observability, maintainability, documentation, and test coverage.
• Drive ambiguous, cross-functional initiatives to completion with a high degree of ownership, self-direction, and sound judgment.
• Collaborate primarily with product and engineering teams in the US, while joining regular discussions with Asia teams to discover, clarify, and align requirements.
• Build with Swift, Kotlin, or Rust depending on the problem, and actively learn and adopt new languages, platforms, and tools rather than being limited to a single technology stack.
• Use AI coding tools throughout the development lifecycle—from exploration and implementation to testing, review, and documentation—while maintaining strong engineering judgment and accountability.
• Build and maintain reusable AI workflows, engineering harnesses, and technical knowledge bases that improve the entire team’s speed and quality.
• Review code, share context openly, mentor teammates, and make decisions that improve both engineering quality and overall team outcomes.
• Contribute to hiring, onboarding, and the continuous improvement of team practices.

What We Look For In You

• B.S. or M.S. in Computer Science, or equivalent practical experience.
• Proven experience shipping and operating production-quality mobile applications, with deep expertise in iOS or Android.
• Strong proficiency in at least one of Swift, Kotlin, or Rust, with a demonstrated willingness to learn and contribute in unfamiliar languages and technology stacks.
• Exceptional ownership and self-direction, with the judgment to make pragmatic decisions and drive ambiguous work to completion.
• Demonstrated, regular use of AI coding tools with measurable impact on delivery speed, code quality, or engineering effectiveness.
• A team-first mindset: you communicate openly, share knowledge, support peers, and align technical decisions around the best outcome for the team and product.
• Genuine curiosity about card issuing and payment businesses, plus the ability to communicate technical decisions clearly with partners across the US and Asia. Professional proficiency in English and Mandarin Chinese is required.

Nice to Haves

• Hands-on experience with global card issuance flows, card processing, payments, fintech, crypto, or other high-trust financial products.
• Experience launching products across multiple countries or regulatory environments.
• Knowledge of mobile security, payment authentication, risk controls, or transaction lifecycle design.
• Experience improving mobile architecture, shared components, developer tooling, or engineering productivity at team scale.
• Experience mentoring engineers or leading cross-functional technical initiatives.

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!

OKX Statement

OKX is committed to equal employment opportunities regardless of race, color, genetic information, creed, religion, sex, sexual orientation, gender identity, lawful alien status, national origin, age, marital status, and non-job related physical or mental disability, or protected veteran status. Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

The salary range for this position is $178,888 to $268,333.

In addition to the salary, a performance bonus and long-term incentives may be provided as part of the compensation package, as well as a full range of medical, financial, and/or other benefits, dependent on the position offered.

Notice

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