Senior Engineer, API & Middleware Development (Java / WSO2)

United States Digital Space LLC; Singapore; On-site; SGD 120,000 - 180,000; Full time

Benefits offered by this job

Competitive base salary

Learning and development opportunities

Job summary

Singapore Bank is seeking an experienced API & Middleware Engineer to design, build, and maintain enterprise APIs and microservices across on-premises and AWS. You will lead a team, translate business needs into scalable solutions, and partner with architects and product owners to deliver secure, resilient services.

The ideal candidate has 8+ years in software engineering, strong Java/Spring Boot expertise, and deep payments domain knowledge.

Qualifications

• Bachelor's degree in Computer Science, IT, Engineering.
• 8+ years of hands-on software engineering with enterprise-scale apps.
• 5+ years in payments domain, API/microservices experience.

Responsibilities

• Lead the design, development, and maintenance of APIs and microservices.
• Provide technical leadership to a team of engineers.
• Translate business requirements into scalable, secure API solutions.
• Drive architecture, implementation, and governance of RESTful APIs, microservices, and system integrations.
• Lead development of payment services end-to-end: initiation, processing, settlement, reconciliation, reporting.
• Design highly available, fault-tolerant, and performance-optimised services.
• Ensure API governance, security, and lifecycle management (OAuth2, JWT, mTLS, versioning).
• Oversee integrations using API, middleware, messaging, Kafka and IBM MQ.
• Champion reliability via monitoring, observability, logging, and disaster recovery.
• Conduct code reviews and technical assessments to maintain high standards.
• Prepare architecture diagrams, API specs, runbooks, and support procedures.
• Identify improvements to scalability, resilience, security, and developer productivity.

Skills

API development

Java

Spring Boot

Microservices

WSO2

Kafka

IBM MQ

AWS

Docker

Kubernetes

OAuth2

JWT

mTLS

ISO 20022

Payments domain

Education

Bachelor's degree in Computer Science, IT, Engineering

Tools

WSO2 API Manager

WSO2 EI

WSO2 Micro Integrator

API Gateway

Kafka

IBM MQ

AWS

Docker

Kubernetes

Jenkins

Bitbucket

Jira

Confluence

SonarQube

Job description

WHO WE ARE:

As Singapore’s longest established bank, we have been dedicated to enabling individuals and businesses to achieve their aspirations since 1932. How? By taking the time to truly understand people. From there, we provide support, services, solutions, and career paths that meet their individual needs and desires.

Today, we’re on a journey of transformation. Leveraging technology and creativity to become a future-ready learning organisation. But for all that change, our strategic ambition is consistently clear and bold, which is to be Asia’s leading financial services partner for a sustainable future.

We invite you to build the bank of the future. Innovate the way we deliver financial services. Work in friendly, supportive teams. Build lasting value in your community. Help people grow their assets, business, and investments. Take your learning as far as you can. Or simply enjoy a vibrant, future-ready career.

Your Opportunity Starts Here.

Why Join

Imagine being part of a team that builds innovative digital solutions for one of Asia's leading banks. As an API \& Middleware Engineer at the company, you'll have the opportunity to work on cutting-edge projects that transform the way we deliver financial services. You'll be part of a collaborative team that values creativity, innovation, and continuous learning.

How you succeed

To succeed in this role, you'll need to be passionate about software development and committed to delivering high-quality solutions. You'll work closely with cross-functional teams to understand business requirements, design and develop software applications, and ensure seamless integration with existing systems. Your ability to collaborate, innovate, and adapt to changing requirements will be key to your success.

What you do

• Lead the design, development, and maintenance of enterprise-grade APIs and microservices using Java, Spring Boot, and WSO2 technologies across on-premises and AWS cloud environments.
• Provide technical leadership and guidance to a team of engineers, promoting engineering excellence, best practices, and continuous improvement.
• Partner with Product Owners, Business Analysts, Solution Architects, and cross-functional teams to translate business requirements into scalable, secure, and resilient API solutions.
• Drive the architecture, implementation, and governance of RESTful APIs, microservices, and system integrations in alignment with enterprise standards and platform strategies.
• Lead the development of payment services supporting end-to-end payment processing capabilities, including payment initiation, validation, clearing, settlement, reconciliation, and reporting.
• Design and implement highly available, fault-tolerant, and performance-optimised services that meet business, operational, and regulatory requirements.
• Ensure adherence to API governance, security, and lifecycle management standards, including OAuth2, JWT, Mutual TLS (mTLS), authentication, authorization, and API versioning practices.
• Oversee integration initiatives involving internal and external systems using API, middleware, messaging, and event-driven technologies such as Kafka and IBM MQ.
• Champion application reliability through robust monitoring, observability, logging, alerting, performance tuning, capacity planning, and disaster recovery practices.
• Conduct code reviews, solution reviews, and technical assessments to maintain high standards of code quality, security, maintainability, and performance.
• Lead root cause analysis, problem resolution, and production support activities.
• Prepare and maintain technical artifacts, including architecture diagrams, API specifications, design documents, operational runbooks, and support procedures.
• Identify opportunities to enhance platform scalability, resilience, security, maintainability, and developer productivity through continuous improvement initiatives.
• Leverage AI-assisted engineering tools to accelerate API design, software development, testing, troubleshooting, root cause analysis, and performance optimisation while maintaining enterprise engineering standards.
• Work closely with architecture and engineering leadership to drive AI-enabled automation across API development, quality engineering, monitoring, and operational support functions.
• Ensure all AI-generated deliverables comply with enterprise security, governance, regulatory, risk, and coding standards prior to production deployment.

Who you are

• Bachelor's degree in Computer Science, Information Technology, Engineering, or a related discipline.
• 8+ years of hands-on software engineering experience, including the design and delivery of enterprise-scale applications and integration solutions.
• Proven experience leading technical teams, mentoring engineers, and driving successful project delivery.
• Minimum 5 years of experience in the payments domain, covering payment initiation, processing, clearing, settlement, reconciliation, and payment operations.
• Strong expertise in API and microservices development using Java, Spring Boot, Spring Cloud, and related technologies.
• Hands-on experience with WSO2 API Manager, WSO2 Enterprise Integrator (EI) / Micro Integrator, and API Gateway implementations.
• Deep understanding of API lifecycle management, API governance, service design, and API security best practices.
• Experience developing and integrating RESTful and SOAP services using JSON, XML, OpenAPI/Swagger, and related standards.
• Strong experience with cloud-native application development and deployment, preferably on AWS, leveraging containerization technologies such as Docker and Kubernetes.
• Experience designing and implementing event-driven and messaging-based architectures using Kafka, IBM MQ, or similar platforms.
• Solid understanding of payment industry standards and messaging protocols, including ISO 20022, SWIFT, and real-time payment frameworks.
• Experience implementing observability, monitoring, logging, performance management, and resiliency frameworks for mission-critical systems.
• Familiarity with DevSecOps practices and CI/CD toolchains, including Jenkins, Bitbucket, Jira, Confluence, SonarQube, and automated testing frameworks.

Good to have experiences:

• Experience working within banking, transaction banking, payments, or financial services organizations.
• Knowledge of regional and global payment schemes, including SWIFT, FAST, PayNow, GIRO, ACH, RTGS, and instant payment platforms.
• Experience supporting high-volume, highly available payment processing platforms with stringent SLAs and regulatory requirements.
• Exposure to cloud architecture, platform modernization, and digital transformation initiatives.
• Relevant certifications in AWS, Java, WSO2, API Management, or Payments-related domains.
• Experience driving engineering transformation initiatives, including adoption of AI-assisted software development and automation practices.
• Demonstrates strong ownership and accountability for technical outcomes and delivery commitments.
• Leads by example through hands-on technical contribution, innovation, and operational excellence.
• Builds high-performing engineering teams through mentoring, coaching, and knowledge sharing.
• Influences architectural decisions and engineering standards across teams and initiatives.
• Effectively manages competing priorities while ensuring solution quality, resilience, and security.

Who we are

As Singapore's longest established bank, we have been dedicated to enabling individuals and businesses to achieve their aspirations since 1932. How? By taking the time to truly understand people. From there, we provide support, services, solutions, and career paths that meet their individual needs and desires.

Today, we're on a journey of transformation. Leveraging technology and creativity to become a future-ready learning organisation.

But for all that change, our strategic ambition is consistently clear and bold, which is to be Asia's leading financial services partner for a sustainable future.

We invite you to build the bank of the future. Innovate the way we deliver financial services. Work in friendly, supportive teams. Build lasting value in your community. Help people grow their assets, business, and investments. Take your learning as far as you can. Or simply enjoy a vibrant, future-ready career. Your Opportunity Starts Here.

What we offer

Competitive base salary. A suite of holistic, flexible benefits to suit every lifestyle. Community initiatives. Industry-leading learning and professional development opportunities. Equal opportunity. Fair employment. Selection based on ability and fit with our culture and values. Your wellbeing, growth and aspirations are every bit as cared for as the needs of our customers.

What we offer:

Competitive base salary. A suite of holistic, flexible benefits to suit every lifestyle. Your wellbeing, growth and aspirations are every bit as cared for as the needs of our customers.