Java Engineer (Card Product)

Confidential

Hong Kong, Hong Kong permanent

Posted: April 30, 2026

Required Skills

Job Description

About RedotPay

RedotPay is a global crypto payment fintech that integrates blockchain solutions into traditional banking and finance infrastructure. Our user-friendly crypto platform empowers millions worldwide to spend and send crypto assets, providing faster, more accessible and inclusive financial services. We are dedicated to advancing financial inclusion for the unbanked and supporting crypto enthusiasts, driving the global adoption of secure and flexible crypto-powered financial solutions. Join us in shaping the future of finance and making a meaningful impact on a global scale.

Job Responsibilities

Card Payment System Architecture Design: Responsible for the architecture design and iteration of core credit/debit card payment systems, covering the full lifecycle management of cards including account opening, binding, activation, and cancellation, as well as core modules such as payment transaction authorization, clearing & settlement, and reconciliation.

Payment Gateway & Card Processor Integration Design and implement integration with major Card Processors (VISA, MasterCard, etc.)

High-Concurrency Transaction Solutions Build highly available, low-latency card payment systems capable of handling millions of transactions per second.

Risk Prevention & Compliance Design Design anti-fraud rule engines and transaction risk assessment models. Integrate real-time risk control systems (device fingerprinting, behavioral analysis, etc.)

Payment Product Feature Implementation Collaborate with product teams to deliver innovative features such as credit card installments, pre-authorization, one-click payment, and contactless payment.

Data Security & Audit System Develop comprehensive transaction logging and audit systems to support full payment chain traceability, abnormal transaction monitoring, and risk alerts.

Job Requirements

Bachelor’s degree or above in Computer Science, Software Engineering, Information Technology, or related fields.

3-5 years of Java backend development experience, with at least 2 years focused on Payment/Fintech/Card related project.

Hands-on experience in developing core systems for credit cards, debit cards, or third-party payment platforms is highly preferred.

Proficient in Java, with strong command of Spring Boot, Spring Cloud, MyBatis, and other mainstream frameworks.

Solid experience in microservices architecture and distributed system design

Proven track record in building high-concurrency, high-availability systems. Familiar with Redis, Kafka, RocketMQ, MySQL, Elasticsearch, and other middleware.

Knowledge of Tokenization, Payment Routing, Clearing & Settlement processes is a strong plus.

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