GenAI Engineer & LLM Systems Architect

Building production-grade
Agentic AI & LLM Systems

RAG pipelines, agentic workflows, and LLM applications from data ingestion to monitored production deployment. Specializing in LangGraph, CrewAI, LlamaIndex, MCP, and enterprise scale retrieval systems built with Python, FastAPI, and AWS.

Shelton Simbi — profile photo

Introduction

About Me

I'm a GenAI Engineer and LLM Systems Architect based in New York, specializing in building AI systems that ship to production.

My core work sits at the intersection of agentic AI, RAG architecture, and LLM engineering. I design and deploy systems using LangGraph, CrewAI, LlamaIndex, and MCP (Model Context Protocol) for tool integration, with evaluation pipelines built on LangSmith and Ragas to ensure they hold up at enterprise scale.

My ML foundation runs deep. I built fraud detection and anomaly scoring systems that improved accuracy by 47%, data pipelines that cut processing time by 60%, and predictive models reducing forecasting errors by 35%, all integrated into production applications via FastAPI, Docker, and AWS.

At Yeshiva University I teach graduate engineers how to architect these same systems. This covers agentic workflows, vector retrieval, transformer fine-tuning, and responsible production deployment. The best way to sharpen what you know is to teach it.

I hold an M.S. in Data Analytics and Visualization from Yeshiva University and a B.Sc. (Honors) in Business Studies and Computing Science from the University of Zimbabwe.

I am open to GenAI Engineer, LLM Engineer, ML Engineer, and Data Scientist roles where the work is real, the problems are hard, and the systems actually get used.

Career journey

Experience

From production ML and full-stack engineering into LLM systems architecture and agentic AI. Each role built deeper expertise, from fraud detection and data pipelines to RAG pipelines, multi-agent \ orchestration, and teaching the next generation of AI engineers.

  1. TodayAug 2025 – Present

    AI Teaching Assistant

    Yeshiva University

    Teaching graduate engineers how to architect and ship production AI systems in New York City.

    • Instruct graduate cohorts on LLM engineering, RAG architecture, and agentic AI systems using LangGraph, CrewAI, and LlamaIndex
    • Guide students in designing MCP based tool integrations and multi-agent orchestration workflows
    • Mentor on production deployment using FastAPI, Docker, and AWS with evaluation via LangSmith and Ragas
    • Bridge AI research and real-world engineering, from transformer fine-tuning to monitored production APIs
  2. GrowthOct 2022 – Jul 2025

    Data Scientist | Software Developer

    NSSA

    Built and deployed end-to-end ML and AI systems processing high-volume financial data in Harare, Zimbabwe.

    • Architected ML fraud detection systems achieving a 47% improvement in prediction accuracy, integrated into production enterprise web applications
    • Built an AI powered Business Intelligence platform using LangChain and RAG, enabling natural language to SQL querying over enterprise databases
    • Developed real-time anomaly detection pipelines on high-volume transactional data using Python, Apache Spark, and vector based semantic retrieval
    • Automated large-scale data engineering workflows cutting pipeline processing time by 60% through distributed processing and intelligent orchestration
  3. FoundationApr 2019 – Sep 2022

    Full-Stack Software Developer

    JSC

    Predictive analytics, reporting automation, and intelligent dashboards for decision-makers in Harare, Zimbabwe.

    • Built ML powered predictive analytics systems reducing operational forecasting errors by 35%, integrated into enterprise grade web platforms
    • Automated reporting and analytics workflows with Python and SQL, cutting manual effort by 40%
    • Developed data visualization dashboards serving executive and operational stakeholders

Skills & Tools

Data & databases

PostgreSQLMySQLMongoDBSnowflakeApache SparkSQLGraphQLCypherNeo4jPineconeWeaviatepgvector

Machine learning

Scikit-learnTensorFlowPyTorchSupervised & Unsupervised Learning Time Series & ForecastingEnsemble & Deep ModelsAnomaly DetectionPredictive Modeling

LLMs & GenAI

LLMsRAGGraph RAGHybrid RAGPrompt EngineeringContext EngineeringFine-TuningEmbeddingsNLPAgentic AIMulti Agent SystemsLangChainLangGraphLlamaIndexCrewAIMCP (Model Context Protocol) LangSmithRagasDeepEvalGuardrails AISemantic RetrievalvLLM

Programming, MLOps & frontend

PythonTypeScriptSQLFastAPIFlaskDockerMLflowAWS (Bedrock, SageMaker)CI/CDNext.jsReactStreamlitvLLM

Let's build something

Open to new opportunities. Get in touch for collaborations or just to say hello.

© 2026 Shelton Simbi