Senior Full-Stack Mobile Developer (AI & NLP Focus)

Job Description 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