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

Remote Office; Poland; On-site; PLN 231,871 - 316,188; Full time

Job summary

A dynamic technology company in Poland is urgently seeking a Senior Full-Stack Mobile Developer with technical leadership capabilities. This role involves taking ownership of system architecture and developing scalable solutions across multiple AI-driven products. Key responsibilities include leading development using React Native and Node.js, ensuring system quality, and managing real-time alerts. The ideal candidate will have extensive experience in Full-Stack Development and a passion for building innovative solutions. Join a startup studio environment offering creative freedom and career growth.

Qualifications

• 5+ years in Full-Stack Development.
• Proven experience with scalable system design.

Responsibilities

• Lead end-to-end development using a shared, modular technology stack.
• Design and implement scalable solutions using React Native and Node.js.
• Develop a centralised Admin CommandCenter for internal operations.
• Ensure clean, maintainable, and reusable code across multiple applications.

Skills

React.js

React Native

Node.js

OpenAI APIs

Python

NLP

computer vision

LLMs

Tools

PostgreSQL

Job description

URGENT HIRING

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

• Lead end-to-end development using a shared, modular technology stack
• Design and implement scalable solutions usingReact Native andNode.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 onNLP-based journaling,sentiment analysis, andpattern detection, correlating user inputs with pain/stress signals and delivering empathetic, logic-driven responses.
• Implement and optimiseLLM and Vision APIs, specificallyGPT-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 reusableMaster 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 centralisedAdmin CommandCenter 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 inReact.js
• Mobile: Proven experience withReact Native
• Backend: Node.js with RESTful API design
• Hands-on experience withOpenAI APIs
• Prompt engineering and Vision models
• Hands-on experience withPython
• Experienced inNLP, computer vision, LLMs, and Python-based data workflows.
• PostgreSQL (Supabase preferred) with real-time data synchronization

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