Senior Software Engineer, Payment

Okx

$178,888 - $268,333 / year

San Jose, California, United StatesOn-siteadvanced

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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: 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're looking for a Senior Software Engineer to join our Payments Team, based in the US. Payments is where OKX meets the real financial world. Our team has built and operates the infrastructure connecting OKX to dozens of payment channels across global markets, giving users deposit and withdrawal options that are fast, convenient, and — most importantly — trustworthy. That platform moves and safeguards user assets at institutional scale, continuously, across time zones and regulatory environments.

This is not a greenfield team looking for its footing. The team is established, the platform is in production at scale, and we are actively expanding — both in scope and in headcount. That combination is rare: you get the leverage of joining a growing team where your work visibly shifts the roadmap, along with the discipline that comes from a system already trusted with real money.

It's also an unusually good place to learn. Payments is a domain that's hard to pick up from the outside — every market has its own rails, its own settlement behavior, its own failure modes, its own compliance expectations. Here you'll work across a wide range of payment methods and channels, and you'll build the judgment that comes from operating financial systems where the stakes are real: how to design for correctness when money is on the line, how to reconcile, how to recover, how to keep a platform observable enough that you find problems before your users do.

You'll work closely with product managers, designers, and partner-facing teams, and you'll set the technical bar for the engineers around you — through design docs, code reviews, and the everyday habit of doing things properly when nobody's watching.

If you like the sound of a team where the problems are genuinely hard, the standard is high, and your opinion changes the outcome, we'd like to talk.

What You’ll Be Doing

Design and build the core. Develop high-scale, 24/7 APIs and distributed payment services across multiple cloud providers, using Java and Spring Boot as the primary stack. Own systems end to end — from design doc through production ownership.
Expand our global reach. Help integrate and scale new payment channels and methods across markets, each with its own technical, operational, and reliability characteristics.
Protect user assets. Build for correctness first: consistency, idempotency, reconciliation, failure recovery, and the operational tooling that lets us stand behind every transaction.
Set the technical bar. Participate actively in design and code reviews, giving and receiving direct, constructive feedback. Help evolve the standards a growing team builds on.
Solve the hard problems. Investigate complex distributed-systems challenges and drive them to resolution rather than handing them off.
Partner across functions. Work with product, design, and partner teams across regions to turn ambiguous requirements into shipped systems, and to unblock dependencies before they become delays.
Grow the team's capability. Mentor engineers and share what you learn. Seniority here is measured in leverage, not just output.
Stay curious. Keep pace with a fast-moving industry and bring the good ideas back.

What you'll take away from this role

Deep, practical fluency across a wide range of global payment methods and channels — knowledge that is genuinely hard to acquire anywhere else
Experience designing and operating systems entrusted with substantial user assets, where correctness and recoverability are non-negotiable
A track record of shipping in a regulated, high-stakes domain at real scale

What We Look For In You

5+ years of backend software development experience, with a proven track record of building and operating high-availability, large-scale applications.
Strong engineering fundamentals — data structures, algorithms, concurrency, and software design patterns — and the judgment to know when to reach for which.
Ownership instinct. You take responsibility for outcomes, not just tickets. When something's broken or unclear, you move toward it.
Ability to drive cross-team collaboration, managing complex dependencies and competing requirements without losing momentum.
Excellent problem-solving skills, and comfort operating with autonomy in a fast-paced environment.
Strong written and verbal communication. You can explain a complex technical trade-off to an engineer and to a non-technical stakeholder, and land it with both.
Genuine interest in crypto or fintech, and in building things that make money move better.

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!

The base salary range for this position is $178,888 to $268,333. The salary offered depends on a variety of factors, including job-related knowledge, skills, experience, and market location. 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. Applicants should apply via OKX internal or external careers site.

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 employment-qualified applicants with arrest and conviction records.

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.

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About this role

OKX's Payments team operates the financial infrastructure that connects the exchange to dozens of global payment channels, moving and safeguarding user assets at institutional scale across time zones and regulatory environments. As a Senior Software Engineer, you'd design and build high-availability APIs and distributed payment services using Java and Spring Boot, owning systems end to end from design through production. The work spans integrating new payment methods across markets, each with distinct technical and operational characteristics, while maintaining the correctness and recoverability standards that come with handling real money.

This is an established, production-scale platform actively expanding in scope and headcount—rare ground where your technical decisions visibly shift the roadmap while the team's discipline reflects years of operating financial systems where stakes are real. You'd set the technical bar through design reviews and code, mentor engineers as the team grows, and solve genuinely hard distributed-systems problems rather than hand them off. The role demands strong ownership instinct, cross-functional collaboration across product and regional partner teams, and the communication skills to explain complex trade-offs to both engineers and non-technical stakeholders.

The position requires 5+ years of backend development with a track record building large-scale, high-availability systems, solid fundamentals in data structures and concurrency, and genuine interest in crypto or fintech. You'll gain deep, hard-to-acquire knowledge of global payment methods and the judgment that comes from designing systems where correctness is non-negotiable. Based in San Jose and in-office, the role offers competitive compensation ($178,888–$268,333 base), healthcare, wellness allowances, and L&D support.

How this employer is doing

solid

Recently Raised Funding

In the news

Crypto Exchange OKX Raises at $25 Billion From StanChart, Circle, Bloomberg.com

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Pay for this role

$178,888 to $268,333 per year

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