Sebastian Cherny, Developer in Buenos Aires, Argentina
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Sebastian Cherny

Verified Expert  in Engineering

Software Developer

Buenos Aires, Argentina
Toptal Member Since
September 2, 2022

Sebastian has been a developer since he finished high school. He fell in love with programming once he realized how powerful it is in solving problems. Sebastian is about to finish a career in math, and his goal is to be able to combine math and programming in projects with social impact.


Stealth Health Company
Python, JavaScript, SQL, Django, Object-relational Mapping (ORM)...
Christenson and Recendes Company
Web Dashboards, Python, React, Django, APIs, Amazon Web Services (AWS)...
The Numericus Group
Python, OOP Designs, Jupyter Notebook, Linux, Git, Back-end, JSON...




Preferred Environment

Django, Python, React, PostgreSQL, Visual Studio, MacOS, Linux, JavaScript

The most amazing...

...project I've developed and launched in just a few months was a code refactor for a huge company with 2,000 daily users.

Work Experience

Full-stack Engineer

2023 - 2023
Stealth Health Company
  • Created a Django admin view for users to upload PDFs and send them by fax and Selenium tests to simulate a user going through every situation of the flow.
  • Developed a scraper with Selenium to obtain information from a link and scrape through its pages; also set up the corresponding unit testing.
  • Added onboarding documentation so that new developers can install and have everything running smoothly locally.
Technologies: Python, JavaScript, SQL, Django, Object-relational Mapping (ORM), Amazon Web Services (AWS), Docker

Full-stack Python and React Developer

2022 - 2023
Christenson and Recendes Company
  • Developed a web app that allows users to register and upload datasets and analyze bar graphs, pie charts, and heatmaps to better understand the data and report to the admins when something is off.
  • Set up automatic deploys to render after each commit so my clients have the latest version online.
  • Created a ticketing system inside the app so admins can approve and communicate with new users.
Technologies: Web Dashboards, Python, React, Django, APIs, Amazon Web Services (AWS), PostgreSQL, Full-stack, CSS, Bootstrap, HTML5, JavaScript, Chart.js, Fetch, Front-end, Heatmaps, Web Scraping, Visual Studio, Data Visualization, JSON Web Tokens (JWT)

Freelance Software Engineer

2022 - 2022
The Numericus Group
  • Developed a mathematical model to predict future temperature values based on past information, improving previous versions by 10% on average.
  • Created tests that allowed new code to be tested before deployment.
  • Facilitated a report table to compare previous and actual predictions.
Technologies: Python, OOP Designs, Jupyter Notebook, Linux, Git, Back-end, JSON, Applied Mathematics, Testing, PostgreSQL, Object-oriented Programming (OOP), GitHub, Visual Studio, Data Visualization

Software Engineer

2018 - 2022
  • Created a system that allowed 200 data entry professionals to generate sheets in Google Drive and share them.
  • Maintained the code to create changes requested by users and, consequently, facilitate their work.
  • Oversaw a deployment process after each change to verify that everything worked properly.
Technologies: Python, JavaScript, Google Drive, HTML, CSS, MySQL, Linux, Git, APIs, Front-end, Back-end, Amazon Web Services (AWS), REST APIs, JSON, Django ORM, Django REST Framework, Google Drive API, Testing, SQL, Databases, Front-end Development, Unit Testing, Functional Testing, Full-stack, Full-stack Development, Agile Software Development, Amazon EC2, Amazon S3 (AWS S3), Web Development, HTML5, Object-oriented Programming (OOP), Django, Microservices, GitHub, Bootstrap, API Integration, Visual Studio, Agile, Automation

Software Engineer Intern

2021 - 2021
  • Refactored a widely-used part of code from a legacy system to an updated system with 2,000 daily users.
  • Created queries in advance and tracked the new code use after deployment.
  • Conducted team meetings to test changes before deployment and get feedback for improvements.
  • Suggested improvements to teammates regarding similar refactors.
Technologies: PHP, React, Hack, GraphQL, Git, Front-end, Back-end, Testing, SQL, Databases, TypeScript, Front-end Development, Unit Testing, Full-stack, Full-stack Development, Agile Software Development, Web Development, HTML5, Object-oriented Programming (OOP), Microservices, GitHub, API Integration, Jest, Agile

Software Engineer Intern

2020 - 2020
  • Worked on front-end improvements to make a catalog page more user-friendly for users selling products.
  • Conducted team meetings to test changes before deploying them.
  • Created SQL queries to test changes after deploying to a portion of users in beta testing.
  • Worked with a team of developers and designers to reach our goals.
Technologies: Hack, PHP, React, SQL, Git, Front-end, Back-end, Testing, Databases, TypeScript, Front-end Development, Unit Testing, Full-stack, Full-stack Development, Agile Software Development, Web Development, HTML5, Object-oriented Programming (OOP), Microservices, GitHub, Jest, Agile

Software Engineer

2016 - 2018
  • Developed (on my own) a set of alarms that would run on Icinga continuously and send emails if something started to fail.
  • Implemented alarms to test the deployment of new code, running everything on a pre-production environment.
  • Created alarms based on my own ideas, catching bugs in the code before deploying it to production.
Technologies: Python, Icinga, Amazon Web Services (AWS), Linux, Google Drive, Testing, Unit Testing, SQLAlchemy, Client-server Model, Agile Software Development, Amazon EC2, Amazon S3 (AWS S3), Object-oriented Programming (OOP), Microservices, GitHub, Bootstrap, Agile, Automation

Software Engineer

2014 - 2015
  • Developed a web scraper, using Python and XPath, that looked for products that different top companies were selling.
  • Took feedback from data entries and made adjustments to improve the process.
  • Maintained a database for the products created to produce an entire catalog, adding more than 1,000 products per week.
Technologies: Web Scraping, Python, Google Drive API, Back-end, Amazon Web Services (AWS), Testing, Databases, MySQL, XPath, XML, SQL, Client-server Model, Object-oriented Programming (OOP), GitHub, Selenium, Automation

Web App for Math Olympiad Problem Solving
A web app to create and solve mathematical problems for high school students training for the Math Olympiads. The app set weekly tasks, and users would get points if they solved them correctly during the first hour. In addition to working mainly on the front end using JavaScript, I set up some communication with the back end using Go.

Tournament Creator and Tracker

A web app used by a table football tournament organizer to create teams and track points and matches. It also records data. Before the app, the organizer did everything manually, so counting the points to have a trustworthy table took several minutes. I created the entire app and deployed it online.

Food App for Restaurants

A program used for communication between restaurant staff: Servers create food orders, chefs see them, and servers and other users track the status of orders. I collaborated with a team and was in charge of user communication, ensuring that the chat and status tracking system were user-friendly.

Competitive Programming
I've participated in many virtual international contests (Codeforces, TopCoder, HackerRank, and AtCoder). This required fast solving of original competitive problems, participation in ICPC Regional five times (in teams), obtaining 6th place in the region South-America South in 2020 and 2018; I was the main coder of the team.


Python, JavaScript, SQL, HTML, CSS, C++, TypeScript, HTML5, PHP, Hack, R, Go, GraphQL, Visual Basic .NET (VB.NET), Java, XPath, XML


Django, Django REST Framework, Bootstrap, Selenium, Jest, JSON Web Tokens (JWT)


React, REST APIs, Django ORM, Google Drive API, SQLAlchemy, Pandas, Chart.js


Git, GitHub, Plotly, Visual Studio, Microsoft Teams


Testing, Unit Testing, Responsive Web Design (RWD), Agile Software Development, Object-oriented Programming (OOP), Agile, Automation, API Architecture, Functional Testing, Microservices, Object-relational Mapping (ORM)


Jupyter Notebook, Linux, Amazon Web Services (AWS), Amazon EC2, MacOS, Icinga, Windows, Docker


MySQL, JSON, Databases, Amazon S3 (AWS S3), Google Cloud, SQLite, PostgreSQL


Competitive Programming, Google Drive, APIs, Front-end, Back-end, Algorithms, Front-end Development, Full-stack, Full-stack Development, Web Development, API Integration, Web Dashboards, Fetch, Data Visualization, OOP Designs, Applied Mathematics, Web Scraping, API Design, Client-server Model, Responsive Design, eCommerce, Heatmaps

2014 - 2023

Master's Degree Candidate in Mathematics and Computer Science

University of Buenos Aires - Buenos Aires, Argentina

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