Backend Integration Engineer

About Skillfield
Skillfield is a specialist technology consultancy operating at the intersection of cyber, data and AI. We partner with enterprise clients to protect, transform and enable their organisations through outcome-focused, thoughtfully designed solutions. Our reputation is built on impact, not effort.

The Opportunity

Contract: 6 months with potential for extension

Melbourne, hybrid.

We are seeking a Backend Integration Engineer to play a key role in the migration of a legacy web portal to a modern, mobile-first native application. This role focuses on designing and building scalable, reliable backend services that support core user experiences such as events, calendars, chat, auditing, and data synchronisation.

You will work closely with mobile engineers, product managers, and platform teams to modernise APIs, enable robust synchronisation patterns, and ensure backend systems are secure, observable, and resilient throughout the migration journey. This opportunity suits someone who enjoys working in structured delivery environments and values quality, clarity, and shared ownership.

What You’ll Do

• Design, build, and maintain scalable microservices supporting core application domains including events, calendars, synchronisation, audit logging, and chat orchestration


• Define and maintain versioned, mobile-first API contracts that support idempotent writes, delta synchronisation, and offline-friendly workflows


• Lead backend integration efforts during the migration from a web portal to a native mobile application, ensuring smooth client transitions and backward compatibility


• Implement authentication and authorisation middleware, including Okta token validation, OAuth2/OIDC flows, JWT handling, and role-based access controls


• Build reliable synchronisation and audit pipelines with strong traceability, retry mechanisms, and error handling


• Support high service reliability through monitoring, structured logging, alerting, and incident response


• Own CI/CD pipelines and deployment automation to enable safe, repeatable, and observable releases


• Collaborate with frontend and mobile teams to align API design with real-world client needs and performance considerations

What You’ll Bring

• Strong backend development experience using Node.js and TypeScript


• Experience with backend frameworks such as NestJS and/or Express


• Solid understanding of RESTful API design, OpenAPI specifications, and versioning strategies


• Experience with security and identity patterns including OAuth2, OpenID Connect, JWT, and Okta integrations


• Hands-on experience with data stores such as PostgreSQL and DynamoDB (or equivalent technologies)


• Experience working in cloud environments, particularly AWS (API Gateway, ECS and/or Lambda, CloudWatch)


• Familiarity with CI/CD pipelines, infrastructure-aware service design, and observability best practices
  
  

Nice to Have

• Experience supporting mobile applications with offline synchronisation or eventual consistency patterns


• Exposure to event-driven architectures or message-based integrations


• Experience modernising or migrating legacy platforms


• Familiarity with distributed tracing and observability tooling

Why Join Skillfield?

• Be part of a team focused on delivering work that matters


• Join a culture that values clarity, autonomy, and shared success


• Enjoy flexibility, support, and performance-based recognition

Ready to make a measurable impact?
Apply now and help us deliver impact that matters.