Dogugun Ozkaya, Developer in İstanbul, Turkey
Dogugun is available for hire
Hire Dogugun

Dogugun Ozkaya

Verified Expert  in Engineering

Data Scientist and Software Developer

Location
İstanbul, Turkey
Toptal Member Since
November 10, 2021

Dogugun is a skilled data scientist with expertise in Machine Learning and data-centric solutions. Proficient in Python and SQL, he drives data-driven decisions and delivers innovative AI solutions. His strengths lie in B2B ML projects, automated pipelines, and real-time APIs. Dogugun's predictive modeling and visualization dashboards empower businesses to optimize processes and gain strategic insights. Dogugun is a valuable asset in advancing businesses with ML-driven solutions.

Portfolio

Amperecloud
Python, Time Series, Time Series Analysis, Scikit-learn, Machine Learning...
Big Consultancy Company
Python, Predictive Modeling, Data Science, Amazon Web Services (AWS), Snowflake...
The Conti Group, LLC
Python, Data Science, Data Reporting, Data Analytics, Microsoft Power BI...

Experience

Availability

Full-time

Preferred Environment

PyCharm, Jupyter, Amazon Web Services (AWS)

The most amazing...

...project was a B2B ML project for a data-driven decision making tool in an enterprise consultation company. I also took part in its automation and deployment.

Work Experience

Lead Data Scientist

2023 - PRESENT
Amperecloud
  • Created time series analytical modules to enable customers to monitor the performance of their PV-energy facilities.
  • Designed and developed time series forecasting models for both power generation and power loss based on seasonal and irradiation data.
  • Developed a comprehensive loss forecast model, coupled with a shading detection algorithm, to detect and classify loss amounts effectively.
  • Established a streamlined data pipeline, optimizing data collection from MongoDB and VictoriaMetrics into Redis for efficient utilization in analytical tasks.
Technologies: Python, Time Series, Time Series Analysis, Scikit-learn, Machine Learning, Pandas, NumPy, VictoriaMetrics, Redis

Data Scientist

2022 - 2023
Big Consultancy Company
  • Developed a B2B machine learning project, complete with an automation pipeline, to cater to diverse internal teams within the organization. Delivered a versatile API serving multiple stakeholders.
  • Created automated Jupyter notebooks tailored to business stakeholders' needs.
  • Introduced coverage metrics to assess the data pipeline's effectiveness and successfully unified disparate data sources.
  • Orchestrated the automation of training, deployment, and model scoring processes in a containerized cloud environment, streamlining operations for increased efficiency.
Technologies: Python, Predictive Modeling, Data Science, Amazon Web Services (AWS), Snowflake, SQL, CatBoost, Docker, Apache Airflow, Tableau

Data Scientist

2021 - 2022
The Conti Group, LLC
  • Developed an analysis project powered by machine learning to estimate urban development and its effect on real estate at macro and micro levels.
  • Augmented the dataset by collecting data from online resources, seamlessly integrating them into our ML model.
  • Developed web scraping bots to collect data from online resources and websites efficiently and in an automated way.
  • Developed user-friendly Jupyter notebooks and PowerBI dashboards to convey model outcomes and their business implications.
Technologies: Python, Data Science, Data Reporting, Data Analytics, Microsoft Power BI, Scikit-learn, Web Scraping, Data Scraping, Scraping, Machine Learning, Gradient Boosting, Linear Regression, Feature Engineering

Data Scientist

2019 - 2022
Amadeus
  • Implemented a customer lifetime value (CLV) prediction model based on loyalty points, contributing to the improvement in customer segmentation products.
  • Worked on extracting loyalty KPIs and creating visualizations using Qlik Sense, collaborating closely with the business intelligence team. We built a data pipeline from the ground up using PySpark tailored specifically for analytical use cases.
  • Collaborated with a consultancy team to deliver simulation projects and conduct in-depth analyses focused on exploring alternative strategies for increasing engagement.
  • Developed, during the COVID-19 crisis, a recommendation tool geared toward increasing passenger engagement. This tool was centered around non-air loyalty items and utilized the ALS Library.
  • Built a profile update-based fraud prediction and monitoring tool for loyalty.
Technologies: Python, PySpark, Recommendation Systems, Machine Learning, Data Science, Big Data, SQL, Data Analytics, Dashboards, Qlik Sense

Data Scientist

2018 - 2019
Enerjisa Uretim A.S. — E.ON Energy
  • Developed predictive maintenance capabilities for thermal plants through a time series forecasting project focusing on FID fans within combustion engines.
  • Collaborated closely with the engineering team at a thermic plant and successfully enhanced coal calorie prediction within the designated mining zone, leveraging the SGeMS tool and ordinary kriging techniques.
  • Developed, in collaboration with the trading team, a model for forecasting the electricity market-clearing price. The outputs were instrumental in guiding the trading team's decisions regarding surplus and shortage pricing strategies.
  • Created near real-time dashboards at both plant and portfolio levels within Grafana.
Technologies: Python, Apache NiFi, OSIsoft PI, SQL, Data Science, Data Analytics, Dashboards, Qlik Sense, Grafana, Time Series Analysis, Predictive Modeling, Keras, Artificial Intelligence (AI)

Software Engineer and Data Scientist

2015 - 2018
Mavi Jeans
  • Took part in developing and deploying an online store on AWS by integrating the ERP services with the eCommerce platform.
  • Undertook the implementation of a recommendation engine utilizing an ALS model. This innovative solution found its home on an AWS EMR instance.
  • Collaborated with the eCommerce team to develop ad-hoc propensity models geared toward bolstering targeted marketing capabilities.
  • Ventured into the development of back-end services for an in-house CRM tool. This endeavor allowed me to work extensively with NoSQL, particularly with Couchbase.
Technologies: Recommendation Systems, Amazon EC2, PySpark, Machine Learning, Data Science, SQL

B2B Consultancy

An industrialized B2B machine learning solution. In this engagement with Toptal, I was part of a team focused on developing the solution.

My role encompassed the creation of the ML model and an API to serve real-time needs within the organization. Additionally, I visualized coverage metrics within the data pipeline, optimizing the process. In the final stages of the project, I worked on visualizing the data model outputs and SHAP values. I contributed by building an MLOps pipeline and automating the training, deployment, and scoring processes of the ML application within a Dockerized environment on AWS.

Urban Development Analysis

An analysis project powered by machine learning solutions to estimate urban development. The initial step was to determine the KPIs to use as the target variable. I scraped websites like The Good Schools and Walk Score with a user-like and efficient approach. I also developed Jupyter notebooks and PowerBI dashboards to deliver model outputs.

Predictive Maintenance for CID Fans in Thermal Power Plant

https://github.com/dogugun/industrial_tsp
A demo showcase project that imitates my work in the power generation industry to estimate the value of the sensor in a 12-hour prediction horizon from its and other related sensor values in a 6-hour time window.

In the original project, the goal was to estimate the vibration of the combustion fan. The input features were temperature, dust collection, and airstream sensors. The target value is the vibration frequency in 6-9-12 hours of prediction horizons.

The input data is collected in SQL Server from Osisoft PI's IoT data. The model is deployed to the on-premise server, and the outputs are visualized in Grafana, along with other input feature values.

In the original project, a GBM was used for retraining and retuning easiness. This demo version uses LSTM as an alternative approach.

Finally, the deployed model and predictive monitoring dashboard are used by supervisor shifts to plan their maintenance program proactively.

Market-clearing Price Estimation

In this challenging task, I aimed to predict the market-clearing price for the energy market. The output of this model is used to plan the week ahead surplus and shortage energy price possibilities.

The model data consisted of renewable forecasts, demand forecasts, plant availability declarations, and natural gas prices. The data is collected in a DWH model in SQL Server from APIs, web scraping, and Excel file reports.

A model is developed with gradient gradient-boosting regressor from the scikit-learn library.

Recommendation Engine for Online Retail Store

I developed a recommendation engine for mavi.com, an online store, using PySpark's ALS model. We used purchase data and access logs to create personalized product suggestions, aiming to boost the conversion rate and introduce cross-category recommendations. The project successfully improved user engagement and conversion rates, highlighting the power of data-driven strategies in eCommerce.

Comparison of Non-parametric Models and Neural Networks in Blood Glucose Prediction

https://tez.yok.gov.tr/UlusalTezMerkezi/tezDetay.jsp?id=7Xp9BRBO0SOctQECK7M1rw&no=KIdCcRP4-ehNYHHpxNxdRw
In my master's thesis, supervised by Prof. Albert Guvenis, I conducted a comparative analysis of blood glucose prediction models. We focused on replicating existing models using AIDA2 simulator data, categorizing them into two groups: non-parametric and neural networks.

Within the non-parametric category, we compared Random Forest Regression (RFR), Gradient Boosting Machines (GBM), and Support Vector Machines (SVM). We pitted Long Short-Term Memory Networks (LSTMs) against Adaptive Neuro-Fuzzy Inference Systems (ANFIS) in the neural network category.

The study revealed that SVM outperformed in terms of Root Mean Square Error (RMSE) among the non-parametric models, while ANFIS demonstrated superior performance in neural networks, surpassing SVM.

Web Scraping and Data Pipeline

This project uses a web scraper to capture profile and activity information from top-level social media accounts for compliance reporting.

The automatized scraper is triggered by corn jobs daily, and the collected data is saved on PostgreSQL DB in AWS.

Stock Market Data Extracting

In a personal finance project, I created a Python script to collect data from finance.yahoo.com for a selection of Turkish stock market companies. The script retrieves data on EPS, 52-week range, and quarterly earnings growth for each company, then ranks the data based on these criteria. The results are saved and emailed.

Technically, the script runs on my personal AWS EC2 cluster. A Lambda service initiates the EC2 instance, and once the script completes its run, it shuts down the instance. The resulting files are archived in an S3 bucket.

Languages

Python, SQL, Snowflake

Libraries/APIs

LSTM, NumPy, Pandas, PySpark, Beautiful Soup, CatBoost, Keras, Scikit-learn

Tools

PyCharm, Jupyter, Qlik Sense, Grafana, Amazon Elastic MapReduce (EMR), Microsoft Power BI, Apache Airflow, Apache NiFi, LaTeX, Tableau

Paradigms

Data Science

Other

Computer Science, Statistics, Recommendation Systems, Machine Learning, Data Analytics, Dashboards, Data Analysis, Data Engineering, Software Development, Biomedical Skills, Big Data, Deep Learning, Data Scraping, OSIsoft PI, Neural Networks, Long Short-term Memory (LSTM), Web Scraping, Stock Exchange, Predictive Modeling, Machine Learning Operations (MLOps), Data Reporting, Time Series Analysis, FastAPI, Geospatial Analytics, Geospatial Data, Recurrent Neural Networks (RNNs), Time Series, Biostatistics, Random Forests, Random Forest Regression, Support Vector Regression, Support Vector Machines (SVM), Adaptive Neuro-fuzzy Inference System (ANFIS), Scraping, Financial Data, Gradient Boosting, Linear Regression, Feature Engineering, Artificial Intelligence (AI), VictoriaMetrics, Large Language Models (LLMs), Pinecone, OpenAI GPT-3 API, OpenAI GPT-4 API, LangChain, Chatbots, Natural Language Processing (NLP), Vector Data, Vector Databases

Platforms

Amazon EC2, Amazon Web Services (AWS), Docker, Jupyter Notebook, AWS Lambda

Industry Expertise

Bioinformatics

Frameworks

Selenium

Storage

Amazon S3 (AWS S3), PostgreSQL, Redis

2014 - 2018

Master's Degree in Biomedical Engineering

Bogazici University - Istanbul, Turkey

2006 - 2011

Bachelor's Degree in Computer Engineering

Bogazici University - Istanbul, Turkey

SEPTEMBER 2023 - PRESENT

Learn LangChain, Pinecone & OpenAI: Build Next-Gen LLM Apps

Udemy

SEPTEMBER 2016 - PRESENT

CS110x: Big Data Analysis with Apache Spark

edX

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring