A leading R&D company based in Castle Hill are currently seeking a full-stack developer to join their growing engineering team. The role is backend focused (70%) but does require frontend knowledge (around 30%). This is a full-time, permanent position which requires you to be onsite in the Castle Hill office. You must have working rights in Australia to be eligible for this position. Key Requirements: Backend Development (70%): API Development & Architecture Design, implement, and maintain RESTful APIs using NestJS , with full OpenAPI/Swagger documentation. Implement secure JWT-based authentication with access/refresh tokens using HTTP-only cookies. Define and validate DTOs with NestJS validation pipes for type-safe request/response contracts. Configure CORS policies , rate limiting (e.g., 40 requests/min/user), and comprehensive request logging. Maintain backward-compatible API versioning , planning for future iterations. Asynchronous Processing & Job Queues Architect and maintain BullMQ queues for background job processing. Handle long-running tasks (e.g., floor plan analysis, ML API integration) with retry and exponential backoff strategies. Monitor queue health, optimise concurrency, and scale processing capacity efficiently. Database Design & Optimisation Design normalised PostgreSQL schemas with proper relationships, constraints, and indexing. Use TypeORM for entities, migrations, and data integrity management. Optimise queries to prevent N1 issues and ensure sub-second response times. Implement transactional consistency for critical multi-step operations. Work with Google Cloud SQL for high availability, backups, and disaster recovery. Cloud & Infrastructure Integration Integrate with Google Cloud Storage for secure file handling. Manage Redis connections for BullMQ job persistence. Design event-driven systems using Google Cloud Pub/Sub ; implement publish-subscribe patterns, versioned message schemas, and dead-letter handling. Ensure reliable message delivery (exactly-once / at-least-once semantics) and monitor system metrics. Deploy containerised microservices on Google Cloud Run with auto-scaling, health checks, and zero-downtime updates. Build serverless functions (GCF Gen 2) triggered by HTTP, Pub/Sub, Firestore, or Storage events with proper retry, idempotency, and performance optimisation. Highly Desirable Skills (Frontend 30%) Build responsive, TypeScript-based React.js applications. Develop reusable UI components, manage state (Redux, Zustand, or Context API), and integrate backend APIs efficiently. Implement real-time updates with WebSockets for job tracking and notifications. Collaborate with designers to create pixel-perfect, accessible interfaces using Tailwind CSS and shadcn/ui . Optimise performance: code splitting, lazy loading, and bundle size reduction. Implement form validation with React Hook Form and Zod, and efficient server state management via React Query . Build interactive data visualisations for analytics and reporting This role is fully onsite in Castle Hill and requires you to already hold a valid working visa in Australia. Sponsorship is not provided. You can find out more about Codematix by visiting codematix.com.au
