Expert ESB Developer | Integration Technical Lead | $1200p/d (remote)

We are seeking an experienced Expert ESB Developer / Integration Technical Lead to support a critical government technology project involving enterprise integrations, payment gateway connectivity and secure transaction processing.

This opportunity requires a highly capable integration specialist who can provide hands‑on technical leadership, develop robust middleware solutions and support delivery against important December 2026 milestones.

The Opportunity Working within a complex enterprise workplace, you will be responsible for the technical design, development, testing and implementation of ESB integrations connecting business applications, payment platforms and external systems.

The role combines hands‑on development with technical leadership, troubleshooting and stakeholder collaboration.

Key Responsibilities

- Lead the technical design, development and implementation of Enterprise Service Bus (ESB) integrations.
- Develop APIs, web services and middleware components supporting secure payment transactions.
- Integrate payment gateways with internal systems, banking platforms, ERP solutions and third‑party applications.
- Design message routing, transformation, orchestration and exception‑handling processes.
- Implement transaction workflows covering authorisation, settlement, refunds, reversals and reconciliation.
- Develop interfaces using REST, SOAP, XML, JSON and messaging technologies.
- Ensure integration solutions meet security and data protection requirements, including PCI DSS where applicable.
- Monitor and optimise integration performance, reliability and transaction throughput.
- Support SIT, UAT,



production deployment and post‑implementation activities.
- Troubleshoot complex integration issues across development, testing and production environments.
- Prepare technical specifications, deployment documentation and knowledge transfer materials.
- Collaborate with solution architects, developers, business analysts and external vendors.

We are seeking an experienced Expert ESB Developer / Integration Technical Lead to support a critical government technology project involving enterprise integrations, payment gateway connectivity and secure transaction processing.

This opportunity requires a highly capable integration specialist who can provide hands‑on technical leadership, develop robust middleware solutions and support delivery against important December 2026 milestones.

The Opportunity Working within a complex enterprise environment, you will be responsible for the technical design, development, testing and implementation of ESB integrations connecting business applications, payment platforms and external systems.

The role combines hands‑on development with technical leadership, troubleshooting and stakeholder collaboration.

Key Responsibilities

- Lead the technical design, development and implementation of Enterprise Service Bus (ESB) integrations.
- Develop APIs,



web services and middleware components supporting secure payment transactions.
- Integrate payment gateways with internal systems, banking platforms, ERP solutions and third‑party applications.
- Design message routing, transformation, orchestration and exception‑handling processes.
- Implement transaction workflows covering authorisation, settlement, refunds, reversals and reconciliation.
- Develop interfaces using REST, SOAP, XML, JSON and messaging technologies.
- Ensure integration solutions meet security and data protection requirements, including PCI DSS where applicable.
- Monitor and optimise integration performance, reliability and transaction throughput.
- Support SIT, UAT, production deployment and post‑implementation activities.
- Troubleshoot complex integration issues across development, testing and production environments.
- Prepare technical specifications, deployment documentation and knowledge transfer materials.
- Collaborate with solution architects, developers, business analysts and external vendors.

Skills & Experience

- 8–10+ years of software development experience.
- Minimum 5 years of hands‑on ESB, middleware or enterprise integration development.
- Proven technical leadership experience delivering enterprise integration solutions.
- Strong experience developing APIs, web services and integration components.
- Experience integrating payment gateways or financial transaction processing platforms.
- Knowledge of payment providers such as Visa, Mastercard, PayPal, Stripe, Adyen, Cybersource or equivalent.
- Strong technical expertise across REST, SOAP, XML, JSON and messaging technologies.

📌 Expert ESB Developer | Integration Technical Lead | $1200p/d (Sydney)
🏢 The Aquarium
📍 Sydney