This is a remote position. Job Title: Senior Full-Stack Mobile Developer (AI & NLP Focus)URGENT HIRINGWork Roster:10:00 AM – 6:00 PM (Melbourne Time) Weekends:Saturday & Sunday Employment Type: Full-Time | Long-Term Experience Required: 5+ years in Full-Stack Development Role OverviewWe are seeking a Senior Full-Stack Mobile Developer with Technical Leadership capabilities for our client in Australia to take ownership of system architecture, development, and long-term maintenance across multiple products. This role is ideal for someone who enjoys building scalable systems from the ground up in a fast-moving startup studio environment. Key ResponsibilitiesArchitecture & Development

• Lead end-to-end development using a shared, modular technology stack
• Design and implement scalable solutions using React Native and Node.js
• Ensure clean, maintainable, and reusable code across multiple applications
• Frame internal dashboards, monitoring, and tooling as part of designing scalable systems and shared platforms.

AI Development

• Building an AI-driven mobile application focused on NLP-based journaling, sentiment analysis, and pattern detection, correlating user inputs with pain/stress signals and delivering empathetic, logic-driven responses.
• Implement and optimise LLM and Vision APIs, specifically GPT-4o
• Develop high-accuracy image recognition and structured text generation pipelines
• Design AI-chaining logic to support multi-step intelligent workflows
• AI audit logs, prompt troubleshooting, and observability as part of building reliable and debuggable AI pipelines.

Cross-Application Scalability

• Build a reusable Master Engine for Authentication, Payments and AI orchestration
• Ensure consistency and scalability across the entire SaaS portfolio
• Ensure user management, subscriptions, and payments as reusable platform components that support multiple products.

Admin & Internal Systems

• Develop a centralised Admin Command Center for internal operations
• Enable system monitoring, user management, and AI troubleshooting.

System Quality & Reliability

• Managing real-time alerts for API failures alongside database performance and bottleneck tracking.

Technical Requirements

• Frontend: Strong expertise in React.js
• Mobile: Proven experience with React Native
• Backend: Node.js with RESTful API design
• Hands-on experience with OpenAI APIs
• Prompt engineering and Vision models
• Hands-on experience with Python
• Experienced in NLP, computer vision, LLMs, and Python-based data workflows.
• PostgreSQL (Supabase preferred) with real-time data synchronization
• Stripe integration experience

What Makes This Role Exciting

• Architectural Ownership: You design and drive the technical vision
• Startup Studio Model: Work across 4+ AI products instead of a single long-term project
• Creative Freedom: Flexibility to choose the best tools and solutions
• Career Growth: Opportunity to lead technical expansion as the product portfolio scales