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18th September, 2026/n A leading R&D; company based in Castle Hill are currently seeking a full-stack developer to join their growing engineering team. /n You’ll be working within a technically solid R&D; environment, developing and supporting software used across the company’s products and systems. /n The role will involve a mix of front-end and back-end development, working closely with a small team of fullstack devs and AI developers to build reliable, user-friendly applications. /n The company are looking for an engineer that's interested in real-world technology and product development, rather than purely web-based projects. /n This is a full-time, permanent position which requires you to be onsite in the Castle Hill office. /n You must have working rights in Australia to be eligible for this position.

Key Requirements: Backend Development: API Development & Architecture /n /n

- Design, implement, and maintain RESTful APIs using NestJS, with full OpenAPI/Swagger documentation.

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- Implement secure JWT-based authentication with access/refresh tokens using HTTP-only cookies.

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- Define and validate DTOs with NestJS validation pipes for type-safe request/response contracts.

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- Configure CORS policies, rate limiting (e.g., 40 requests/min/user), and comprehensive request logging.

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- Maintain backward-compatible API versioning, planning for future iterations.

/n Asynchronous Processing & Job Queues/n

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- Architect and maintain BullMQ queues for background job processing.

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- Handle long-running tasks (e.g., floor plan analysis, ML API integration) with retry and exponential backoff strategies.

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- Monitor queue health, optimise concurrency, and scale processing capacity efficiently.

/n Database Design & Optimisation/n

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- Design normalised PostgreSQL schemas with proper relationships, constraints, and indexing.

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- Use TypeORM for entities, migrations, and data integrity management.

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- Optimise queries to prevent N+1 issues and ensure sub-second response times.

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- Implement transactional consistency for critical multi-step operations.

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- Work with Google Cloud SQL for high availability, backups, and disaster recovery.

/n Cloud & Infrastructure Integration/n

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- Integrate with Google Cloud Storage for secure file handling.

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- Manage Redis connections for BullMQ job persistence.

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- Design event-driven systems using Google Cloud Pub/Sub; implement publish-subscribe patterns, versioned message schemas, and dead-letter handling.

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- Ensure reliable message delivery (exactly-once / at-least-once semantics) and monitor system metrics.

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- Deploy containerised microservices on Google Cloud Run with auto-scaling, health checks, and zero-downtime updates.

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- Build serverless functions (GCF Gen 2) triggered by HTTP, Pub/Sub, Firestore, or Storage events with proper retry, idempotency, and performance optimisation.

/n Highly Desirable Skills:/n

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- Build responsive, TypeScript-based React.js applications.

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- Good knowledge using Javascript

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- Develop reusable UI components, manage state (Redux, Zustand, or Context API), and integrate backend APIs efficiently.

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- Implement real-time updates with WebSockets for job tracking and notifications.

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- Collaborate with designers to create pixel-perfect, accessible interfaces using Tailwind CSS and shadcn/ui.

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- Optimise performance: code splitting, lazy loading, and bundle size reduction.

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- Implement form validation with React Hook Form and Zod, and efficient server state management via React Query.

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- Build interactive data visualisations for analytics and reporting

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- Experience working with machine learning and AI

/n This role is fully onsite in Castle Hill and requires you to already hold a valid working visa in Australia. Sponsorship is not provided./n

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/n Codematix is a recruitment agency. You can find out more about Codematix by visiting codematix.com.au/n /n

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📌 Senior Full-Stack Developer (Sydney)
🏢 Codematix
📍 Sydney