Golang Backend Engineer - Card Payments & Issuing

Castle Island; Singapore; Hybrid; SGD 90,000 - 150,000; Full time

Job summary

BIT is looking for a skilled Golang backend engineer to support its card payment and card issuing systems in Singapore. You will develop and optimize core services handling issuance, accounts, authorization, clearing, settlement, and billing.

You will contribute to end-to-end transaction flows, system architecture, and performance improvements while ensuring security and reliability in a high‑volume fintech environment. Collaboration with product, security, and operations is expected.

Qualifications

• Bachelor's degree or higher in Computer Science or related field.
• 3+ years of experience in Golang and/or Java development.
• Hands-on experience in card issuing/payments/system processing is preferred.
• Strong understanding of concurrent programming and Linux proficiency.
• Familiarity with Docker, Kubernetes, gRPC, Protobuf, and CI/CD.

Responsibilities

• Develop Golang backend for card payment and issuing systems, including issuance, accounts, authorization, settlement, and billing modules.
• Design and implement end-to-end card transaction lifecycle (Authorization, Reversal, Capture, Refund, Reconciliation).
• Contribute to system architecture design, migration of legacy systems, and performance optimization.
• Improve throughput and reliability under high concurrency while ensuring data security and accuracy.
• Maintain technical documentation, enforce code quality, conduct reviews, and write tests.

Skills

Golang

Java

Linux

Data structures

Concurrent programming

Education

Bachelor's degree in Computer Science

Tools

Docker

Kubernetes

gRPC

Protobuf

CI/CD

Job description

BIT is looking for a skilled Golang backend engineer to support its card payment and card issuing systems in Singapore. You will develop and optimize core services handling issuance, accounts, authorization, clearing, settlement, and billing.

You will contribute to end-to-end transaction flows, system architecture, and performance improvements while ensuring security and reliability in a high‑volume fintech environment. Collaboration with product, security, and operations is expected.