Jonas Fitness is looking for a Senior AI Developer to provide technical expertise in AI systems and lead end-to-end solution development, including model integration, toolchain design, and system architecture, to design and develop robust, scalable, and secure agent-based and LLM-driven applications.
Requirements
- Minimum of 6 years of professional software development experience, with at least 3 years in AI/ML, LLMs, or intelligent agent systems
- Hands-on experience with modern AI/LLM stacks including: Python, LangGraph, LangChain, LLM orchestration, RAG pipelines
- Integration with AWS Bedrock, Anthropic Claude, OpenAI, or similar platforms
- Vector databases (e.g., pgvector, Pinecone, Weaviate) and memory management for LLMs
- High-level understanding of agentic design patterns, AI system security, and prompt optimization
- Excellent knowledge of: Object-oriented and functional programming in Python
- Excellent knowledge of: Structured and unstructured data storage (e.g., Postgres, Redis, S3)
Responsibilities
- Provide strong technical expertise in AI systems and maintain responsibility for end-to-end solution development including model integration, toolchain design, and system architecture
- Work extensively on our AI frameworks to design and develop robust, scalable, and secure agent-based and LLM-driven applications
- Design, implement, test, debug, and document AI-powered solutions according to functional and technical requirements
- Diagnose and resolve complex system behaviors involving AI model output, prompt logic, memory strategies, or API integration.
- Apply best practices in prompt engineering, RAG architecture, LangGraph design patterns, and secure AI system development to improve our AI platforms
- Coach and mentor team members in areas such as Python AI development, LLM tool-calling, and LangChain/LangGraph workflows
- Undertake optimization of model interactions (token usage, latency, accuracy) and refactor procedural AI codebases for clarity, maintainability, and performance
Other
- Collaborate with internal stakeholders and, where required, with clients to understand business challenges and provide innovative AI-powered solutions
- Excellent communicator with the ability to explain complex AI and ML concepts clearly to both technical and non-technical stakeholders
- Collaborative and focused on achieving shared team goals in fast-paced environments
- Strong analytical and logical thinking with a structured yet creative approach to designing AI systems
- Self-driven and motivated, with a strong desire to mentor and uplift teammates
