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Senior Full-Stack Mobile Developer (AI & NLP Focus) This is a remote position. Job Title: Senior Full-Stack Mobile Developer (AI & NLP Focus) URGENT HIRING Work 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 Overview: We 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 Responsibilities: • Architecture & 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