Available for opportunities

Paul Koslowsky

Software Engineer & Data Scientist

I build and deploy software, from APIs to full-stack apps, and solve data problems from messy datasets to actionable insights. Clean code, intuitive interfaces, and a solid grasp of the numbers. I like turning ideas into tools people actually use.

View My Work Get in Touch 
import pandas as pd
import numpy as np
from sklearn import magic 🪄

# From data to deployed product
problem = understand_question()
data = wrangle(problem)
insights = analyze(data)
app = build(insights)
deploy(app)

print("Shipped ✨")
Portfolio

Featured Projects

A selection of data science projects showcasing my skills in analysis, machine learning, and building end-to-end solutions.

Numbio math and brain training app

Numbio

TestFlight

A fast, sporty mental math and brain training app built around daily streaks, quick sprint runs, level-based progression, and satisfying score bonuses. Numbio also includes social features, push notification reminders, and a paywall system that is still being refined.

iOS TestFlight React Native Expo App Store Connect
Test on TestFlight Learn More
Fily - AI Powered File Management

Fily

Test now

A local-first macOS desktop application that creates an intelligent, AI-organized virtual file browser. Fily indexes your files and presents them in a smart virtual folder structure without moving, renaming, or deleting your original files. Features AI-powered content extraction, intelligent tagging, and real-time indexing.

Electron React TypeScript SQLite OpenAI API
GitHub
EUROWATCH Dashboard

Eurowatch

Live

European Parliament speech analysis platform with AI-powered topic classification. Analyzes 100,000+ parliamentary speeches using GPT, with interactive dashboards and research-ready data exports.

Node.js SQLite OpenAI API Express Python Jupyter
Live Demo GitHub
KANTWERK Calculator

Kantwerk

Live

Sheet metal profile calculator for fabrication shops. Interactive drawing editor for bent metal profiles with automatic cutting length calculations, order management, and PDF export for production specs.

React TypeScript Node.js SQLite Vite
Live Demo GitHub
DataSphere Analytics Dashboard

DataSphere

Live

Futuristic analytics platform with dark blue theme for exploring sales data, customer hierarchies, and product insights. Features advanced data visualization, real-time analytics, and intelligent price calculations with a modern UI design.

Python Flask React SQLite Pandas
Live Demo GitHub
Background

About Me

A software engineer and data scientist who bridges full-stack development, analytics, and practical problem-solving to build solutions that work.

Paul Koslowsky

I approach problems holistically. From requirements to shipped product. I build full-stack apps and APIs (Python, TypeScript, React), and enjoy the full cycle: data wrangling and analysis, modeling, and turning insights into deployed tools with thoughtful interfaces (this portfolio and the projects below are examples).

Academic Career

MS Business Analytics

2024-2026

Católica Lisbon School of Business and Economics

Master's program focused on data science, statistical analysis, and business intelligence. Core coursework in SQL, Python, machine learning, and data engineering.

SQL Python ML

Visiting Student

2022

Hawaii Pacific University

International exchange program in business studies.

BS Business Administration

2020-2023

Heinrich-Heine-Universität Düsseldorf

Bachelor's degree in business administration with focus on analytics and data-driven decision making.

Work Career

Analytics & Development

2025-Present

VWS Befestigungstechnik GmbH

Developing and deploying end-to-end internal tools with Python, TypeScript (Next.js), and SQL. Built sales data visualization and tracking apps connected to ERP and SQL databases. Data analysis (shipping, pricing) to support operations and decision-making.

Full-Stack Python TypeScript SQL

Startup Marketing

2023-2025

specter automation

Marketing roles at a Cologne-based automation startup. Worked on marketing strategy, social media management, and brand development in a fast-paced startup environment.

Marketing Startup

Consulting & Student Club

2021-2024

Heinrich Heine Consulting, ELFIN Consulting, roatel GmbH, HVM Heaven

Student consulting work and freelance marketing projects. Led marketing initiatives, developed social media strategies, and provided design support for various clients. Served as Head of Marketing for student consulting organization.

Consulting Marketing Design

Data Problem Solving

From hypothesis to analysis, modeling, and actionable insights

Full-Stack & Design

Web apps, APIs, and polished interfaces that feel alive

Applied ML & LLMs

Building, deploying, and integrating AI systems that solve real problems

Expertise

Skills & Tools

The tools and approaches I use to move from raw data to working solutions.

Languages

Python SQL JavaScript TypeScript

Data Science

Pandas NumPy Statistical Analysis Data Wrangling

Machine Learning

Scikit-learn XGBoost NLP Model Evaluation

AI & LLMs

OpenAI API LangChain RAG Prompt Engineering

Data Engineering

SQLite PostgreSQL ETL/ELT APIs

Web & Visualization

React Three.js CSS Data Viz

Surfing

Wave Reading Balance Turns Cutbacks Barrel riding
Get in Touch

Let's Work Together

Always open to discussing data problems, creative coding projects, or opportunities to build something useful together.

paul@koslowsky.net LinkedIn Profile GitHub

© 2026 Paul Koslowsky. Built with cursor and coke zero.

Designed & developed by me

Surfing skill