Senior Engineer - Fiat Payment, Card
OKX is a leading global cryptocurrency exchange offering a wide range of trading services, including spot and derivatives trading, as well as Web3 solutions.
Maintainer signals as of 8/12/2026
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About OKX
OKX is a global cryptocurrency exchange known for its trading services and financial products. The platform offers a wide range of features, including spot and derivatives trading, staking services, and a user-friendly interface suitable for both beginners and experienced traders.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You will develop and maintain Java backend microservices for card issuing, authorization, settlement, and clearing. You will orchestrate transaction workflows with Temporal, optimize SQL schemas and queries for high-concurrency ledgers, use AI development tools, and deliver promotional, rewards, and card lifecycle features.
Requirements
- 1–3 years of backend engineering experience
- Java and Spring Boot proficiency
- Relational database and SQL proficiency
- Experience or understanding of Temporal or Cadence
- Fintech experience and knowledge of card transaction mechanics
- Experience using AI development tools
- Experience with card issuing processors or payment service providers is a plus
- Exposure to Docker Kubernetes AWS or GCP is a plus
Responsibilities
- Develop and maintain Java backend microservices
- Manage transaction lifecycles with Temporal
- Design and optimize SQL schemas and queries
- Integrate AI development tools into coding testing and problem-solving workflows
- Deliver promotional campaign rewards and card lifecycle features