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sanaullah/README.md

👋 Hi, I'm Sana Ullah

Senior Engineer · Production AI with Guardrails · Financial & Enterprise Platforms


About me

I build production-grade AI in data-rich, compliance-aware environments — RAG pipelines, multi-agent workflows, document-intelligence copilots, and LLMOps with guardrails. With 20+ years across backend engineering, database platforms, and mission-critical financial systems, I focus on secure, high-availability data platforms and modernizing legacy integrations into reliable, service-oriented architectures.


What I work on

GenAI / LLM

  • RAG systems with semantic retrieval, source citations, and low-confidence fallbacks
  • Agentic workflows with LangGraph (validate → analyze → summarize)
  • AWS Bedrock integration with structured JSON guardrails and hallucination reduction
  • LLMOps: CI/CD, evaluation frameworks, observability (Langfuse), and responsible AI practices

Platforms & delivery

  • Python production services, REST APIs, and cloud-native microservices on AWS
  • SQL Server / Oracle performance tuning, ETL validation, and incident response
  • Legacy modernization (ColdFusion, Lucee, BoxLang, ColdBox) into scalable service-oriented architectures

Tech stack

AI / ML · Python · LangChain · LangGraph · LlamaIndex · Hugging Face · RAG · vector stores · AWS Bedrock · pytest

Cloud & infrastructure · AWS Lambda · S3 · DynamoDB · API Gateway · Step Functions · Docker

Data & backend · pandas · NumPy · SciPy · SQL Server · Oracle · PostgreSQL · T-SQL · REST · microservices

Application platforms · TypeScript · React · Node.js · Java

Engineering practices · SSMS · SQL Agent jobs & monitoring · source control & deployment · technical documentation · mentorship & technical leadership


Philosophy

  • Reliability over cleverness — especially in regulated systems
  • Guardrails before demos — structured outputs, citations, and human review paths
  • Performance is a design decision, not a last-minute fix
  • Code should be understandable by the next engineer

Above all, I value clarity, correctness, and operational safety over shortcuts.


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