Senior Backend Engineer

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Cognativ

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2018

💼 Consulting

🥽 AR/VR

🤖 Artificial Intelligence

Consulting • AR/VR • Artificial Intelligence

Cognativ is an app development agency based in Melbourne, Australia. They combine user experience design, product strategy, and software engineering to deliver mobile and web applications, e-commerce systems, and branded digital experiences. Their specialties include UX and UI design, website and app development (iOS, Android, React Native, React. js, node. js, Python), conversion optimisation, and emerging technologies such as AI/machine learning and AR/VR; they position themselves as quality-focused IT services and consulting partners.

📋 Description

• Design and own backend architecture for authentication, user profiles, activities, preferences, and progress tracking. • Build and maintain scalable backend services using NestJS and TypeScript. • Design secure, mobile-first REST APIs with OpenAPI/Swagger documentation. • Model and optimize PostgreSQL databases using Drizzle ORM. • Implement secure authentication and authorization using JWT, refresh tokens, sessions, and role-based access control. • Develop caching strategies and distributed coordination using Redis. • Build background jobs, scheduled tasks, and notification services. • Integrate push notification services using APNs and Firebase Cloud Messaging (FCM). • Implement structured logging, monitoring, tracing, and production observability. • Collaborate with Product and Mobile teams to define API contracts and ensure an excellent developer experience. • Write clean, maintainable, and well-tested code with strong ownership from design through production.

🎯 Requirements

• 5+ years of backend development experience. • 3+ years building large-scale mobile-facing APIs. • Strong expertise in TypeScript and Node.js. • Hands-on experience with NestJS or similar backend frameworks. • Strong PostgreSQL database design and query optimization skills. • Expertise in REST API design, versioning, pagination, rate limiting, and error handling. • Experience implementing secure authentication and authorization. • Experience with Redis caching and distributed systems. • Hands-on experience with background jobs and asynchronous processing. • Experience integrating mobile push notifications (APNs and/or FCM). • Strong understanding of observability, logging, monitoring, and production troubleshooting. • Experience working with Git, code reviews, and modern software development practices. • Ability to leverage AI tools effectively for planning, debugging, and improving developer productivity. • Nice to have: Bun runtime in production. • Nice to have: Drizzle ORM expertise. • Nice to have: OAuth2 / OpenID Connect. • Nice to have: CI/CD pipelines (GitHub Actions, Jenkins, Azure DevOps). • Nice to have: Performance profiling and optimization. • Nice to have: Feature flags and remote configuration. • Nice to have: Event-driven architectures, WebSockets, or Server-Sent Events (SSE).

🏖️ Benefits

• Flexible hybrid working policy. • Professional growth and learning opportunities. • Opportunity to work on a modern backend platform using the latest technologies. • A collaborative team of experienced engineers. • A supportive and inclusive work environment.