AI-Native Full Stack Engineer: Build Production-Grade Software

Rex Software; Brisbane; On-site; AUD 140,000 - 180,000; Full time

Job summary

Rex Software is seeking an experienced Senior Full Stack Developer to lead production‑quality features across frontend and backend systems, leveraging AI coding agents as a core development tool. You will own architecture, review AI outputs for security and performance, and drive the adoption of AI native engineering practices across product teams.

You will shape how Rex builds software with AI, mentoring peers and delivering impact for customers across Australia and beyond.

Qualifications

• Strong commercial software engineering experience with the technical depth expected of a Senior Full Stack Developer.
• Demonstrated experience delivering software across both frontend and backend systems.
• Hands on experience using AI coding agents such as Claude Code, Cursor, GitHub Copilot, Cody, Aider or similar as part of genuine agent driven development workflows.
• Strong software engineering fundamentals across system design, API design, databases, testing and deployment.
• The ability to critically assess AI generated code and identify issues relating to performance, security, edge cases, maintainability and architectural fit.
• Experience working within established production codebases and making sound technical decisions in complex environments.
• Strong debugging and problem solving skills across the full technology stack.
• The ability to communicate technical concepts clearly and work effectively within a collaborative product team.
• A portfolio, GitHub profile or personal projects that demonstrate how you use AI within your development process.

Responsibilities

• Design, build and deliver production quality features across frontend and backend systems within your product stream.
• Use AI coding agents as a primary development tool to generate, test, debug and iterate on code.
• Provide AI agents with the architectural context, coding standards and domain knowledge required to produce high quality outputs.
• Critically review AI generated code for correctness, performance, security, maintainability and architectural fit before it reaches production.
• Determine when AI assisted development is the right approach and when manual implementation will produce a better outcome.
• Debug and resolve complex technical issues across the stack using both traditional engineering techniques and AI assisted workflows.
• Work confidently within established system architecture, including database schemas, API contracts, service boundaries and deployment pipelines.
• Contribute to technical design discussions, architectural decisions and code reviews.
• Maintain and improve automated test coverage across the codebase.
• Ensure AI generated code is supported by appropriate testing and meets our engineering standards.
• Identify and address technical debt while balancing delivery speed with the long term health of our products.
• Take ownership of the quality and production readiness of the software you deliver.
• Build and refine prompts, context documents and system instructions that help AI agents understand Rex's architecture, patterns and conventions.
• Improve established codebases for agent driven development through clear documentation, AGENTS.md files, Skills and other AI friendly engineering practices.
• Experiment with new AI development tools, techniques and workflows to improve engineering productivity.
• Identify common failure modes in AI generated code and develop practices that improve the reliability and quality of agent output.
• Share effective prompting strategies, workflows and lessons with the wider engineering team.
• Work closely with Product Managers, Designers and Engineers to deliver against product priorities.
• Participate in technical planning, sprint ceremonies, code reviews and engineering discussions.
• Mentor and support other engineers through technical collaboration and knowledge sharing.
• Help uplift AI native development capability across the broader engineering team.
• Contribute ideas and feedback as we continue evolving how software is built at Rex

Skills

Senior Full Stack Developer

AI coding agents

Frontend and backend

Code review & architecture

Debugging

Communication in product team

Portfolio/GitHub

Tools

Docker

Kubernetes

GCP

PostgreSQL

MySQL

Vue.js

React.js

PHP

Laravel

Job description

Rex Software is seeking an experienced Senior Full Stack Developer to lead production‑quality features across frontend and backend systems, leveraging AI coding agents as a core development tool. You will own architecture, review AI outputs for security and performance, and drive the adoption of AI native engineering practices across product teams.

You will shape how Rex builds software with AI, mentoring peers and delivering impact for customers across Australia and beyond.