Senior Full-Stack Engineer (AI Focus)

About Baryons

Baryons is at the forefront of AI-powered mentorship, designed to empower every member of an organization, from frontline employees to C-suite executives. Our mission is to bridge skill gaps and enhance decision-making through tailored guidance and actionable insights. We’re a fast-moving, values-driven team building scalable, high-impact products that connect cutting-edge research with real-world needs.When it comes to building tech, Baryons is on a mission to transform how organizations leverage AI agents and multi-agent frameworks—including advanced voice technologies and other modalities—to improve productivity and drive innovation. Our fast-growing team is building scalable, AI-enabled products at the intersection of cutting-edge technology and real-world application.

Role Overview

As a Senior Full-Stack Engineer (AI Focus), you’ll play a pivotal role in developing, deploying, and optimizing applications that leverage the latest in AI/ML tools and models—with a focus on voice interaction and multimodal user experiences. You’ll work across the stack—building web applications, APIs, database integrations, and (potentially) mobile experiences—helping to deliver robust, user-focused products that incorporate advanced AI capabilities across voice and other modalities.

Responsibilities

• Design, build, and maintain modern web applications and user interfaces using React.js and Jinja templates, integrating AI-powered features and experiences—including voice and multimodal interactions.
  
  

• Develop and maintain backend APIs and services with Python (FastAPI).
  
  

• Build, Optimize, and Maintain containerized voice agent application (Python)
  

• Integrate and operationalize third-party and open-source AI models and services (e.g., OpenAI, GCP, LiveKit, Hugging Face, vector databases, RAG systems) within production applications.
  
  

• Work with relational databases (SQL Server, PostgreSQL) for schema design, optimization, and data flows that support both business logic and AI requirements.
  
  
  

• Contribute to mobile application development using React Native as needed.
  
  

• Collaborate with product, design, DevOps, and other engineers to deliver seamless, performant, and scalable solutions.
  
  

• Follow best practices for security, testing, CI/CD, and cloud deployment (Azure and Google Cloud (GCP) preferred; AWS/OCI also valued).
  
  

• Mentor junior team members and contribute to a culture of technical excellence and continuous improvement.
  
  
  

Required Qualifications

• 5+ years of experience in software engineering, including substantial full-stack development.
  
  

• Proficient in React.js and Jinja templates for building modern web applications.
  
  

• Strong experience with Python (FastAPI) for backend API development.
  
  

• Experience integrating AI/ML models or APIs—including voice, speech-to-text, or similar services—into production systems (no need to train models from scratch, but able to use, configure, and optimize them).
  
  

• Solid understanding of relational databases (SQL Server, PostgreSQL).
  
  

• Experience with React Native for mobile app development or willingness to learn.
  
  

• Familiarity with containerization (Docker, Kubernetes) and CI/CD workflows.
  
  

• Experience with cloud platforms (Azure and Google Cloud (GCP) strongly preferred).
  
  

• Strong communication and problem-solving skills, with a collaborative approach.
  
  
  

Nice-to-Have

• Experience with vector databases (PGVector, Pinecone, etc.) and retrieval-augmented generation (RAG) systems.
  
  

• Exposure to LLMs (OpenAI, Llama, Cohere, Anthropic, etc.), prompt engineering, and conversational/voice AI integrations.

• Prior experience in a startup or high-growth SaaS environment.
  
  

• Knowledge of multi-agent orchestration frameworks (CrewAI, LangGraph, Haystack, etc.).
  
  

• Experience building or integrating multimodal user interfaces (voice, text, and beyond).