Senior Backend Engineer, Card Platform & Payments

Reap; Hong Kong; On-site; HKD 900,000 - 1,200,000; Full time

Job summary

Reap, a Hong Kong-based fintech, seeks a Senior Software Engineer for the Card Engineering team. You’ll design, develop, and operate services that power card transactions, fraud detection, and lifecycle management, with developer-facing APIs.

You will own end-to-end delivery, collaborating with Product, Compliance, and other engineers in a fast-moving environment. Experience in TypeScript/Node.js and AWS is highly valued.

Qualifications

• 6+ years of software engineering experience in fintech or related fields.
• Experience building backend systems in a typed language (e.g., TypeScript, Java, Go).
• Solid grasp of distributed systems concepts: async processing, retries, observability, eventual consistency.
• Strong judgment balancing correctness, performance, and maintainability.
• Ability to collaborate in cross-functional teams and communicate technical tradeoffs effectively.
• Comfortable working in a fast-paced, evolving product environment.

Responsibilities

• Design and build backend services for card transaction processing, fraud detection, and card program management
• Contribute to system architecture and technical decisions with a focus on performance, fault tolerance, and maintainability
• Collaborate with cross-functional stakeholders (Product, Risk, Finance, Compliance) to deliver robust, compliant financial systems
• Write clean, observable, and well-tested code in a service-oriented architecture
• Participate in code reviews, incident response, and ongoing reliability improvements
• Help evolve our engineering practices, tools, and system designs as we scale

Skills

6+ years of software engineering

Backend systems

Distributed systems

Cross-functional collaboration

Fast-paced environment

Tools

TypeScript

Node.js

NestJS

AWS

Job description

Reap, a Hong Kong-based fintech, seeks a Senior Software Engineer for the Card Engineering team. You’ll design, develop, and operate services that power card transactions, fraud detection, and lifecycle management, with developer-facing APIs.

You will own end-to-end delivery, collaborating with Product, Compliance, and other engineers in a fast-moving environment. Experience in TypeScript/Node.js and AWS is highly valued.