Senior AI/Backend Engineer

Job Title: Senior AI/Backend Engineer Location: Remote – Latin America Preferred (Must overlap with U.S. time zones) Type of Contract: Full-Time | Remote Salary Range: Market Rates Language Requirements: Professional English proficiency We are seeking a skilled Senior AI/Backend Engineer with deep expertise in Python, AI orchestration, and cloud-native backend systems to join our growing team. You will play a key role in developing a scalable, production-ready AI Voice Dispatch Assistant operating entirely within a secure AWS environment. Your work will directly impact the reliability, intelligence, and scalability of a multi-agent voice AI platform. Key Responsibilities Design, implement, and maintain a multi-agent AI system using Strands Agents SDK (BidiAgent) deployed on AWS ECS/Fargate, ensuring per-session isolation, auto-scaling, and lifecycle management of Nova 2 Sonic BidirectionalStream. Develop and maintain high-performance backend services and APIs using FastAPI, including centralized API client libraries for Member Services, Dispatch, Coverage, and Eligibility workflows. Build robust backend features such as Pydantic-based data models, field-level PII masking, audit logging, and endpoint-level caching strategies. Implement LLM orchestration and Retrieval-Augmented Generation (RAG) pipelines, including triage super-agent routing using Nova Micro and specialized sub-agent delegation. Integrate AWS Bedrock Knowledge Bases, OpenSearch Serverless, and Titan embeddings to ground AI responses using technical documentation and domain-specific knowledge. Configure security, compliance, and content protection controls, including Bedrock Guardrails, AWS Cognito authentication, FastAPI JWT middleware, and Lambda-based authorization mechanisms. Develop and manage serverless infrastructure components including API Gateway, AWS Lambda handlers, DynamoDB session state management, and ElastiCache Redis integrations. Must-Have Qualifications 5+ years of senior-level software engineering experience with a strong focus on Python development. Extensive experience building scalable, resilient backend systems and APIs, preferably using FastAPI. Strong hands-on expertise with AI/ML concepts, including LLM orchestration, prompt engineering, and Retrieval-Augmented Generation (RAG). Deep knowledge of AWS services including ECS/Fargate, Lambda, API Gateway, DynamoDB, ElastiCache, and AWS Bedrock services such as Nova 2 Sonic and Nova Micro. Experience with multi-agent AI architecture frameworks such as Strands Agents SDK or similar technologies. Solid understanding of authentication, security, and compliance best practices, including PII handling, prompt-injection protection, and access control systems. Ability to collaborate effectively across distributed teams while maintaining consistent overlap with U.S. business hours. Preferred Qualifications Experience building production-grade voice AI or conversational AI systems. Familiarity with OpenSearch Serverless, Titan embeddings, and AWS-native RAG implementations. Experience designing secure, enterprise-grade AI solutions within controlled cloud environments. Background working with healthcare, dispatch, or operational workflow automation platforms.