Senior Backend Engineer – Digital Wallets & Payments

Aptimized; Phoenix (AZ); On-site; USD 140,000 - 200,000; Full time

Job summary

Aptimized is seeking a Senior Backend Engineer to join our fast-paced Payments team focused on digital wallet platforms and API integrations with major providers such as Apple Pay, Google Pay, and Samsung Wallet. You will contribute to the development of highly scalable, secure, cloud-native backend services supporting wallet orchestration, tokenization, banking integrations, and payment processing.

The role requires strong Java and Kotlin experience, microservices, Kafka, and OpenShift in a

Qualifications

• Strong backend experience with Java (8+), Kotlin for enterprise apps.
• Proven microservices architecture and cloud-native development.
• Experience with Kafka for asynchronous processing.
• Proficiency with REST APIs and API security.
• Experience with NoSQL databases (Couchbase).
• Familiarity with OpenShift or similar orchestration.

Responsibilities

• Design and develop backend microservices for payment and wallet ecosystems.
• Build secure public APIs and integration services.
• Implement asynchronous processing with Kafka.
• Integrate with wallet providers and financial institutions.
• Ensure security, tokenization and encryption.
• Work in OpenShift-based cloud environment.
• Collaborate with cross-functional teams.

Skills

Java 8+

Java 21+

Kotlin

Microservices

Vert.x

Spring Boot

Kafka

NoSQL Couchbase

REST APIs

API security

Encryption/Crypto

Cloud-native

OpenShift

Tools

OpenShift

Job description

Aptimized is seeking a Senior Backend Engineer to join our fast-paced Payments team focused on digital wallet platforms and API integrations with major providers such as Apple Pay, Google Pay, and Samsung Wallet. You will contribute to the development of highly scalable, secure, cloud-native backend services supporting wallet orchestration, tokenization, banking integrations, and payment processing.

The role requires strong Java and Kotlin experience, microservices, Kafka, and OpenShift in a