Senior Backend Engineer

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

Job summary

Mox Bank in Hong Kong (SAR) is seeking a Senior Backend Engineer to scale a cloud-native digital banking platform. You will join the Technology-CIO team and build robust backend services in Kotlin or Java.

The role emphasizes API design, microservices, secure and scalable systems, and close collaboration with cross-functional teams. This permanent, full-time position requires a CS degree and AWS experience.

Qualifications

• Fluent in Kotlin or Java with solid backend experience.
• Strong understanding of distributed systems and microservices.
• Hands-on experience with event-driven architecture and CI/CD.
• Experience with AWS or similar cloud environments.

Responsibilities

• Build and continuously improve backend systems and services.
• Develop RESTful APIs and event-driven microservices.
• Design and operate reliable, scalable, and secure services.
• Write high-quality, maintainable code with strong automated tests.
• Build services in Kotlin or Java within a cloud-native microservice architecture.
• Work with event streams and relational databases.
• Use containers and orchestration platforms to deploy and run services.
• Implement continuous integration and delivery practices.
• Monitor production services and respond to incidents.
• You build it, you run it.

Skills

Kotlin

Java

Distributed systems

Event-driven

API design

CI/CD

AWS

Team collaboration

Incident response

Production operations

Education

Bachelor's degree in Computer Science

Tools

AWS

Job description

Senior Backend Engineer

Application Deadline: 31 December 2026

Department: Technology-CIO

Employment Type: Permanent - Full Time

Location: Hong Kong (SAR)

Description

About Mox

Mox is built by and for the ones who aspire to live life to the fullest – we call them Generation Mox! The name Mox reflects the endless opportunities we can create, - Mobile eXperience; Money eXperience; Money X (multiplier), eXponential growth, eXploration... it’s all up for us to define together.

Why Mox

Everything at Mox – from our products, features, to rewards – is designed based on customer research, tailor made for your needs. We care about what customers care about, especially in data security and privacy. Data ethics is core to everyone here at Mox. Mox rewards you with an array of banking and lifestyle benefits.

Responsibilities

Join us in scaling and evolving a digital bank using cloud-native technologies. We’re a high-performing team solving exciting problems and delivering high-quality products in small, interdisciplinary teams. We are redefining what modern banking in Hong Kong can look like through engineering excellence, product thinking, and continuous delivery.

• Build and continuously improve backend systems and services.
• Develop RESTful APIs and event-driven microservices.
• Design and operate reliable, scalable, and secure services.
• Write high-quality, maintainable code with strong automated tests.
• Build services in Kotlin or Java within a cloud-native microservice architecture.
• Work with event streams and relational databases.
• Use containers and orchestration platforms to deploy and run services.
• Implement continuous integration and continuous delivery practices.
• Monitor production services and respond to incidents.
• You build it, you run it.

Requirements

Fluent in Kotlin or Java. Solid experience in backend development and CI/CD processes. Solid understanding of distributed systems and microservice design. Hands-on experience with event-driven architecture.

• Strong API design skills, including backward compatibility.
• Strong testing practices across unit and integration levels.
• Ownership mindset for production operations and incident response.
• Experience with AWS or similar cloud environments.
• Quick learner with a results-driven mindset.
• Effective collaborator in fast-paced, cross-functional teams.
• Strong communication and organisational skills.
• Familiarity with AI-assisted software development workflows.

Your Qualifications

Bachelor’s degree in Computer Science or equivalent.