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cronny25/README.md

Senior Full Stack Engineer | Cloud-Native Systems | Scalable Architecture | AI-Enabled Platforms

Senior Software Engineer with 10+ years of experience designing and delivering high-performance distributed systems across FinTech, Healthcare, Insurance, and SaaS platforms.

I specialize in backend architecture (Go, Python, Node.js), cloud-native systems (AWS), cross-platform frontend applications (React, Next.js, TypeScript), and mobile development (React Native, Flutter). I also build AI-enabled product platforms using modern LLM infrastructure.


πŸš€ What I Focus On

  • Designing scalable microservices architectures
  • Building event-driven systems with high reliability
  • Cloud-native development on AWS
  • AI-enabled product features using modern LLM platforms
  • Retrieval-Augmented Generation (RAG) system design
  • Cross-platform application development (Web + Mobile)
  • CI/CD & Infrastructure as Code
  • Secure, compliant systems (SOC2, HIPAA)
  • Performance optimization & observability

πŸ—οΈ Architecture-Driven Engineering

I build systems with:

  • Clean Architecture principles
  • Domain-driven design
  • API-first development (REST, GraphQL)
  • Event-driven pipelines (Kafka, SQS, Lambda)
  • LLM-powered services and AI microservices
  • Retrieval pipelines with vector databases
  • Infrastructure automation (Docker, ECS, Kubernetes)
  • Cross-platform UI architecture for Web and Mobile
  • Blue/Green & zero-downtime deployments

πŸ€– AI & LLM Systems

Experience building production-ready AI capabilities including:

  • LLM-powered APIs and internal tools
  • Retrieval-Augmented Generation (RAG) architectures
  • Prompt engineering and evaluation pipelines
  • Vector search using embedding models
  • AI-assisted document processing and summarization
  • Workflow orchestration for AI pipelines
  • Secure integration of external AI services

Focus on practical AI systems that integrate with existing production architectures rather than isolated prototypes.


πŸ“± Mobile Engineering

Experience developing production-grade cross-platform mobile applications:

  • React Native mobile applications for iOS & Android
  • Flutter applications with scalable architecture
  • Shared API layers across Web and Mobile platforms
  • Mobile performance optimization
  • Secure authentication flows (OAuth2, JWT, biometrics)
  • Offline-first mobile data synchronization
  • App store deployment and CI/CD automation

Focus on building scalable mobile platforms aligned with backend systems and APIs.


πŸ’‘ Highlighted Projects

πŸ”Ή Distributed Quoting Engine (Go + Node + React)

High-availability service processing high-volume requests with retry strategies, idempotency keys, and caching layers.

  • Microservices architecture
  • Redis-based rate limiting
  • Circuit breaker pattern
  • 99.9% reliability design

πŸ”Ή Event-Driven Document Processing Pipeline

AWS Lambda + Step Functions workflow automating asynchronous document generation.

  • S3 triggers
  • Step Functions orchestration
  • Retry & dead-letter queue strategy
  • Structured logging & tracing

πŸ”Ή AI Knowledge Retrieval Platform (RAG)

AI-powered internal knowledge system combining LLMs with vector search.

  • Document ingestion & embedding pipelines
  • Vector database retrieval
  • Prompt orchestration layer
  • Context-aware responses from enterprise documents
  • API-based AI service architecture

πŸ”Ή Multi-Tenant SaaS Architecture

Full-stack SaaS boilerplate demonstrating:

  • Role-based access control (RBAC)
  • OAuth2 + PKCE
  • Tenant isolation strategies
  • PostgreSQL indexing & performance tuning
  • Dockerized local dev environment

πŸ› οΈ Tech Stack

Backend

Go (Gin), Python (FastAPI, Django), Node.js (NestJS, Express)

Frontend (Web)

React, Next.js, Vue, TypeScript, Redux, React Query

Mobile

React Native, Flutter, cross-platform mobile architecture

AI / LLM

OpenAI APIs, LangChain, RAG architectures, vector databases, embedding pipelines, prompt engineering

Cloud & DevOps

AWS (Lambda, ECS, RDS, S3), Docker, Kubernetes, GitHub Actions, CI/CD

Data

PostgreSQL, MongoDB, Redis, Snowflake, Kafka, vector databases


πŸ“ˆ Engineering Principles

  • Systems over features
  • Reliability over hype
  • Observability by default
  • Secure-by-design
  • Performance is a feature
  • Practical AI over demo AI
  • Code is a liability unless well-tested

Pinned Loading

  1. secure-auth-service secure-auth-service Public

    TypeScript 1 1

  2. angular-antd angular-antd Public

    Angular project styled with Ant Design

    TypeScript 1

  3. ergo-dex-frontend ergo-dex-frontend Public

    TypeScript 1

  4. modern-react-hooks modern-react-hooks Public

    JavaScript

  5. fmt fmt Public

    Forked from fmtlib/fmt

    A modern formatting library

    C++

  6. reusable-components reusable-components Public

    TypeScript