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Santosh NarayananSN

Santosh Narayanan

LangChain & RAG Platform Engineer

€500/day
Frankfurt am Main, DE
15+ years

Average response time: 1 hour

About Santosh

Senior Python Backend Engineer & AI Platform Architect (20+ years)

I design and build scalable, production-grade backend systems with specialization in GenAI, RAG, and multi-agent architectures. I help companies move from PoC to reliable AI systems deployed across AWS, GCP, and Azure with clean microservice design and async processing.

Core Expertise
  • FastAPI & Django REST, SQLAlchemy, GraphQL
  • Microservices & event-driven systems (RabbitMQ, Celery)
  • Secure APIs, JWT auth, performance optimization
  • LangChain, LangGraph, OpenAI API integration
  • Hybrid RAG (Graph + Vector: Neo4j, Weaviate, Pinecone, Qdrant)
  • Docker, Kubernetes, CI/CD, Terraform, cloud-native deployment

Selected Work
  • Smart Developer Assistant – Multi-agent AI platform for code intelligence
  • Dealflow Intelligence – Hybrid Graph + Vector AI analytics system
  • NVIDIA AI Platform – Enterprise-grade LLM architecture & inference

Available for production GenAI implementation, RAG architecture, backend microservices, and AI integration projects (2–6 months).

Frankfurt am Main | Remote across DACH & EU
  • English

    Native or bilingual

Can work on-site
Frankfurt am Main (up to 20km), Berlin (up to 10km)

Experience

  • Independent & Open Source
    AI Platform Engineer
    July 2025 - Today (11 months)
    Germany
    • • Smart Developer Assistant (SDA): Architected and deployed multi-agent AI system for automated code intelligence, refactoring, and DevOps artifact generation using LangChain, LangGraph, FastAPI, Qdrant, React TypeScript. Implemented ingestion-to-deployment pipeline processing 50+ repositories with 90%+ accuracy in generating Docker, Kubernetes, and CI/CD templates. Graph + Designed orchestration architecture, caching. (GitHub
    Python Langgraph
  • Breakwater solutions
    Senior Fullstack Developer
    October 2024 - June 2025 (8 months)
    Germany
    • • Designed and implemented Agentic AI workflows using LangChain and LangGraph to automate complex financial data-mapping processes across 10–20 client-specific workflows, reducing manual effort significantly.
    • • Built Retrieval-Augmented Generation (RAG) pipelines with LangChain and Pinecone to enable LLM driven semantic search and rule-based data transformation for banking templates.
    • • Developed AI-assisted data ingestion pipelines capable of dynamically adapting to client-specific schemas, rules, and column structures, persisting changes automatically in the database.
    • • Implemented an Agentic AI-driven DevOps automation system that analyzed frontend/backend repositories (TypeScript, JavaScript, Angular) and auto-generated Docker Compose configurations, reducing setup time from days to minutes.
    • • Refactored backend services to FastAPI + SQLAlchemy, improving memory efficiency by 45%, and containerized full-stack services for production-ready CI/CD deployment.
    • • Designed deterministic agentic workflows with structured outputs, rule-based validation, and schema enforcement to evaluate correctness, prevent hallucinations, and ensure reliable execution across multi-step RAG and tool-using pipelines.
    • • Implemented multimodal agent pipelines integrating OpenAI Whisper for speech-to-text ingestion, enabling voice-driven inputs to be processed through LangChain-based RAG and multi-agent reasoning workflows.
  • Breakwater Solutions,
    Senior Fullstack Developer
    December 2022 - July 2024 (1 year and 7 months)
    Germany
    • • Designed and implemented asynchronous processing pipelines using FastAPI with RabbitMQ and Celery, improving system scalability and reducing processing bottlenecks while increasing workflow throughput by ~35%.
    • • Implemented proactive monitoring and quality controls using Grafana dashboards and automated pytest suites, reducing production issues and improving system stability and mean-time-to-resolution.
    • • Built ReactJS components with AWS Cognito & S3, increasing engagement 15%.
    • • Optimized GraphQL with DataLoader, improving performance by 35%.
    • • Strengthened backend security and reliability by implementing JWT-based authentication, FastAPI middleware, and API hardening patterns, improving platform robustness and reducing operational issues in production environments.

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Education

  • IBM RAG and Agentic AI: Build Next-Gen AI Systems
    (IBM
    2025
    IBM RAG and Agentic AI: Build Next-Gen AI Systems
  • Google Cloud Certification: Machine Learning Engineer Professional Certificate
    (Google
    2025
    Google Cloud Certification: Machine Learning Engineer Professional Certificate

Skill set

Categories