Çağatay is available for hire

Çağatay Onur Şengör

Verified Expert in Engineering

Back-end Developer

Aydın, Efeler, Turkey

Toptal member since April 27, 2022

Expertise

Web Development Back-end Developers Data Engineering Ubuntu Python Linux Django JavaScript PostgreSQL CSS Git Databricks Docker NLP

Bio

Çağatay is a senior data engineer and Python back-end developer specializing in PySpark, Databricks, Delta Lake, FastAPI, and Pydantic for fintech. He designs scalable data pipelines with a focus on data quality and reliability. His path into engineering began when, as a newly graduated translator, he discovered NLP and saw neural machine translation not as a threat but as an opportunity - teaching himself to code, building production tools, and going deep into ML.

Portfolio

OnCorps

Amazon S3 (AWS S3), Amazon Web Services (AWS), Databricks, PySpark, Pandas...

Self-employed

Python 3, Django, Django REST Framework, JavaScript, Flask, FastAPI, NGINX...

FinTech Startup

Python, Angular, JavaScript, Open Source, Web Development, Microsoft Excel...

Experience

Django - 5 years
REST - 5 years
Git - 5 years
APIs - 5 years
Google Cloud - 3 years
Docker - 3 years
Amazon Web Services (AWS) - 2 years
Go - 1 year

Preferred Environment

Docker, Databricks, PySpark, FastAPI, Pydantic

The most amazing...

...product I developed was a data pipeline consisting of client-agnostic tasks which could be driven from a user-facing app.

Work Experience

Senior Director of Software Engineering

2023 - PRESENT

OnCorps

Developed a data engineering pipeline for various engagements and use cases.
Developed client-facing Angular components for tabular data.
Attended client calls and maintained good relationships.

Technologies: Amazon S3 (AWS S3), Amazon Web Services (AWS), Databricks, PySpark, Pandas, MLflow, Angular, Python 3, TypeScript, Data Engineering, Machine Learning, Microsoft Excel, Boto 3, Git

Developer

2017 - PRESENT

Self-employed

Fixed the search function on a Django app by editing the regular expression the client was using in their JavaScript code and adjusting their Django views to handle the queries.
Wrote a script that denoises gigabytes of data in .csv files. The client needed the script to handle arguments to determine which data were noise, and I implemented it successfully.
Used GitHub and GitHub organizations to manage source code.
Built a Docker container companion to deploy, update, and remove containers in Go.
Used Jira and Trello to manage tickets and milestones.

Technologies: Python 3, Django, Django REST Framework, JavaScript, Flask, FastAPI, NGINX, Linux, Docker, Go, Python, Ubuntu, Atom, CSS, PostgreSQL, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), TypeScript, Electron, APIs, REST, Git, HTML, Node.js, SQL, Amazon S3 (AWS S3), Google Cloud Storage, SQLite, Docker Compose, React, Celery, Containers, Amazon Web Services (AWS), Back-end, Microsoft Excel, Rust, Data Engineering, Databricks, PySpark, Boto 3, PyTorch, TensorFlow

Back-end Developer

2022 - 2023

FinTech Startup

Created file ingestion pipelines for daily feeds in Databricks.
Identified bugs and optimized true/false check pipelines.
Attended design meetings to determine deliverables and timelines.

Technologies: Python, Angular, JavaScript, Open Source, Web Development, Microsoft Excel, Data Engineering, Databricks, PySpark, Boto 3, Git

Translator and Reviewer

2012 - 2023

Self-employed

Helped clients enter new markets, ensuring their tone wasn't lost in translation.
Managed the translation efforts from Russian to Turkish for a cosmetics company.
Performed leading quality assurance (LQA) for marketing material issued for a popular cloud-computing platform.

Technologies: Translation, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT)

Experience

Computer-Assisted Translation Tools: Kaplan

https://github.com/kaplanPRO/

Kaplan consists of 3 sub-projects:
• kaplanpy, the Python library that offers computer-assisted translation tool functions
• Kaplan desktop, an Electron app that is built around kaplanpy
• Kaplan cloud, a dockerized Django app that also offers translation management system features to manage teams of translators

Neural Machine Translation App: Ceviri

A neural machine translation app (Turkish to English) that handles both text and certain file formats. I used the translation memories I built over the years (with consent from the clients) as my corpus, and the kaplanpy module, which I develop and maintain, to process files.

Python Script to Select Data from CSV

The client had GBs of data in the form of compressed CSV files and required a Python script that extracts some of the data based on a specific set of criteria, which I delivered. Later, the client requested the script to take in the requirements as arguments so that they could fetch different parts of the data, which I also delivered.

Troubleshoot Search Bar on a Django App

The client had a Django app, but its search function was not working. They had issues with spaces and special characters. I implemented regular expressions in their JavaScript code and troubleshot their Django view responsible for searches.

3D Mobile Unity Game with Online Component

Prototyped a Unity game with Photon Engine. The game could be described as a free-for-all mode for a team contact sport. I coded the player avatar interaction logic, power-up spawn criteria, and integrated Photon Engine.

Toptal React Accelerator

The Toptal React Accelerator is an exclusive learning program that educates JavaScript developers in React, NextJS, Redux, and GraphQL. This is a 2-month program that consists of rigorous learning exercises and hands-on activities along with a stringent evaluation process, comprehensive learning assessments, and 30-40 hours of building an Invoice Management System. Within this invoicing application, users are able to track invoices, clients, and company information.

Education

2020 - 2022

Associate Program in Web Design and Coding

University of Anatolia - Eskişehir, Turkey

2008 - 2013

Bachelor's Degree in Translation and Interpreting

Istanbul University - Istanbul, Turkey

Certifications

JULY 2022 - PRESENT

Toptal React Accelerator Graduate

Toptal, LLC

MAY 2021 - PRESENT

Natural Language Processing

DeepLearning.AI, via Coursera

Skills

Libraries/APIs

PySpark, React, Node.js, PyTorch, TensorFlow, Pandas, Pydantic

Tools

Git, Docker Compose, NGINX, Boto 3, Celery, Microsoft Excel, Atom

Languages

Python 3, JavaScript, CSS, Python, HTML, TypeScript, SQL, Rust, Go, C#

Frameworks

Django, Django REST Framework, Flask, Electron, Sphinx Documentation Generator, Unity, Angular

Platforms

Ubuntu, Docker, Linux, Databricks, Amazon Web Services (AWS)

Storage

PostgreSQL, SQLite, Amazon S3 (AWS S3), Google Cloud Storage, Google Cloud

Paradigms

REST, Web UX Design, Web UI Design, Web App Design

Other

Translation, Web Development, Back-end, Interpretation, Data Engineering, Server Management, Natural Language Processing (NLP), APIs, Containers, Generative Pre-trained Transformers (GPT), FastAPI, Content Management Systems (CMS), Learning Management Systems (LMS), Ubuntu Server, Hugging Face, CI/CD Pipelines, Open Source, MLflow, Machine Learning

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