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dmtr-karan/README.md

👋 Hi, I’m Dimitrios Karanikolopoulos

Python Developer / Backend Engineer with a background in computational physics, automation, and scientific Python/Qt tooling. I build practical, testable Python systems (FastAPI, MongoDB, pytest, CI/CD) and user-facing AI workflows (Streamlit + OpenAI API).

Featured Projects

🧙 D&D Concept-to-Build (Streamlit)

RP-first concept → playable build draft (SRD-only by default).

  • Streamlit chat app with prompt guardrails and SRD-only constraints (public-safe).
  • Optional Homebrew via UI toggle (homebrew is explicitly labeled).
  • Session persistence (local) + test suite (unit/contract).
    Repo: https://github.com/dmtr-karan/dnd-concept-to-build

🗃️ D&D SRD Mongo (Data pipeline + optional API)

SRD ingestion + validation pipeline for MongoDB, with CI artifacts.

  • JSON Schema validation + idempotent ingest patterns.
  • GitHub Actions pipelines for validation and artifact generation.
  • Optional SRD “grounding” API for downstream apps.
    Repo: https://github.com/dmtr-karan/dnd-srd-mongo

⚡ FastAPI Mini-Blog (API)

REST backend demonstrating auth + clean API design.

Open-source Contributions

📈 PyQtGraph

Contributed a focused bug fix to PyQtGraph, a scientific Python/Qt visualization library.

  • Fixed a FlowchartCtrlWidget.chartWidget() name-shadowing issue.
  • Added a focused regression test and kept the public API behavior intact.
  • Merged PR: pyqtgraph/pyqtgraph#3537

Other Work

💬 Streamlit Interview Simulator

Interactive OpenAI-powered interview practice app (streaming, stop control, feedback flow).
Repo: https://github.com/dmtr-karan/streamlit-interview-simulator

Skills (short list)

  • Python backend: FastAPI, Pydantic, REST APIs, MongoDB, testing (pytest), CI/CD (GitHub Actions)
  • Scientific Python / Qt: PyQtGraph, PyQt/PySide, GUI debugging, regression testing
  • AI workflows: OpenAI API, prompt design/guardrails, Streamlit state & UX
  • Automation background: experiment/data workflows, reproducible pipelines

Links

Pinned Loading

  1. dnd-concept-to-build dnd-concept-to-build Public

    RP-first D&D concept-to-build generator (Streamlit). Turn a vibe into a playable character draft

    Python

  2. dnd-srd-mongo dnd-srd-mongo Public

    Compact MongoDB pipeline for D&D 5e SRD class data — automated JSON Schema validation, ingest, and CI/CD workflows.

    Python

  3. fastapi-mini-blog fastapi-mini-blog Public

    Compact FastAPI API implementing JWT auth, posts, and comments — structured for clarity and maintainability.

    Python

  4. optical-propagation-demo optical-propagation-demo Public

    GPU-accelerated optical field propagation demo (ASM + 2-step Fresnel scaling) using MATLAB. Includes LG mode generation, thin-lens operator, sampling checks, and comparison plots.

    MATLAB 1

  5. slm-phase-retrieval slm-phase-retrieval Public

    Phase & amplitude retrieval for LCOS Spatial Light Modulators using Python. Full device integration, fringe fitting, and phase correction pipeline.

    Python 1

  6. streamlit-interview-simulator streamlit-interview-simulator Public

    Streamlit app that simulates a job interview using OpenAI, with Stop control, early-stop rules, and structured feedback.

    Python