Senior Mobile Frontend Engineer (iOS/Android) - Payments

OPTIMUM SOLUTIONS (SINGAPORE) PTE LTD

Singapore

On-site

SGD 120,000 - 160,000

Part time

14 days+

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Job summary

OPTIMUM SOLUTIONS (SINGAPORE) PTE LTD is seeking a Frontend Mobile Software Engineer to build secure, scalable mobile experiences within their digital payments ecosystem. The role focuses on delivering production-grade iOS/Android apps with WebView bridges and secure-by-default design.

The contract is 6 months with renewal possible based on performance and business needs. You will own end-to-end mobile delivery, collaborate across teams, and contribute to automated testing, CI/CD, and security

Qualifications

8 or more years of hands-on mobile development experience
Strong experience with iOS (Swift) or Android (Kotlin/Java), including WebView and bridge integrations
Degree in Computer Science, Information Systems, Engineering or a related field
Experience with AWS-native environments (ECS/Fargate, API Gateway/ALB, RDS, S3, CloudWatch/CloudTrail, WAF)
Familiarity with CI/CD tools such as Jenkins and Bitbucket
Strong understanding of API security (authentication, signing, nonce/timestamp, anti-replay, idempotency)

Responsibilities

Design and develop mobile UI/UX experiences across merchant discovery, WebView journeys, QR/NFC launches, consent flows, payment experiences and post-payment journeys
Own end-to-end delivery of mobile Mini Program capabilities from development through testing and deployment
Develop secure frontend-to-server integrations with external partners
Apply secure development practices and secure-by-default design
Build and maintain automated testing and quality controls including CI/CD pipelines
Monitor and troubleshoot production issues and perform root-cause analysis
Collaborate with Backend, QA, Security and partners to ensure delivery