Senior Full Stack Java Developer - Payments

AttractPay is a New Zealand–based payments provider (trading as Attraction International Ltd) that enables local merchants to accept Alipay and other major Chinese mobile payment methods.

Our platform offers a secure, fast, and low-cost integration, with transactions settled within 24 hours and robust transaction monitoring.

With more than 330 merchants across New Zealand – including over 30 stores at Auckland International Airport – AttractPay helps local businesses tap into China's large e-wallet user base.About the Position

As a Senior Full Stack Developer specialising in Microsoft technologies, you will play a critical role in the development, enhancement, and maintenance of Attractpay's payment and financial transaction platforms.

These platforms connect users to digital payment services and financial products, enabling secure, reliable, and high-performance transaction processing.

You will collaborate with cross-functional teams to deliver scalable cloud-based solutions and support the ongoing evolution of the organisation's payment ecosystem.

Key Responsibilities

1. Payment Platform Development : Design, build, secure, and optimise high-load payment processing services using C#, .

NET 6+, .

NET Core, and SQL Server, ensuring reliability, data accuracy, concurrency integrity, and high system availability.

2. API & System Integration : Develop RESTful APIs and microservices integrating with internal financial systems, third-party payment gateways, identity providers (OAuth / OIDC), AML / KYC systems, and blockchain-related services as required.

3. Cloud-based Application Development : Build modular, cloud-native applications using Microsoft Azure services including App Services, Azure Functions, Azure SQL, Azure Service Bus, Key Vault, and Azure Storage, ensuring scalability, resilience, and secure service delivery.

4. Front-end Development : Enhance and maintain front-end modules using React, Angular, or Blazor, delivering responsive user interfaces, seamless API consumption, and consistent user experiences across all supported devices.

5. Security & Compliance : Identify and resolve security vulnerabilities, implement secure authentication and authorisation (OAuth 2.0, OIDC, JWT), enforce encryption standards, and ensure adherence to financial services security policies, PCI-related principles, and cloud security best practices.

6. End-to-End Delivery Ownership : Own feature delivery from design to production, including coding, unit testing, integration testing, automated testing frameworks, debugging, deployment, monitoring, and post-release stability.

7. DevOps & CI / CD : Use Azure DevOps, GitLab, or Jenkins to design and maintain CI / CD pipelines for automated builds, testing, security scanning, infrastructure deployment (IaC with Bicep / ARM / Terraform), and application release management.

8. System Optimisation : Refactor legacy components, tune backend performance, optimise SQL queries and indexing strategies, reduce API latency, and adopt updated frameworks and libraries to improve throughput and efficiency.

9. Cloud Migration : Assist in migrating existing systems from on-premises, monolithic, or legacy architectures to modern Azure cloud-native environments, ensuring minimal downtime, improved resilience, and enhanced scalability.

10. Data Handling & Security : Ensure secure and efficient data storage using SQL Server, Azure SQL, or NoSQL solutions such as Cosmos DB.

Implement access control, encryption-at-rest / in-transit, data integrity verification, and centralised secure logging.

11. Continuous Improvement : Perform code reviews, assess system architecture, identify optimisation opportunities, and lead continuous improvement initiatives aligned with modern .

NET, Azure, and DevOps best practices.

12. Partner & Client Support : Provide expert-level technical support for payment processing issues raised by internal teams, merchants, clients, and partners, ensuring accurate diagnosis and timely resolution.

13. Cross-team Collaboration : Collaborate with cloud architects, integration specialists, security teams, and third-party partners to evaluate architectural options and deliver optimal cloud and platform solutions.

14. Maintainable Architecture : Ensure system design promotes maintainability, modularity, extensibility, and scalability to support emerging payment features, compliance changes, multi-tenant capabilities, and future product initiatives.

15. Team Leadership & Guidance : Mentor and guide offshore and internal development teams, providing technical leadership, code quality oversight, architectural direction, and ensuring adherence to engineering standards.

16. Documentation & Integration Support : Develop and maintain documentation including system architecture diagrams, sequence flows, API specifications, technical workflows, and integration guidelines for internal and external development teams.

17. Standards & Methodologies : Ensure alignment with secure coding standards, Microsoft Engineering Fundamentals, OWASP principles, Azure Well-Architected Framework, cloud engineering methodologies, and SDLC governance.

Qualifications

Bachelor's degree or higher in Information Technology, Computer Science, Software Engineering, or a related discipline.

Experience

More than five years of progressively responsible experience in full-stack software development within the Microsoft ecosystem, preferably in financial services or other regulated industries.

Experience with cloud-based solutions, enterprise-level applications, or IoT-integrated systems will be viewed favourably.

Technical Knowledge

• Advanced proficiency in Microsoft development technologies, including .

NET, C#, ASP.NET Core, Entity Framework, and SQL Server.