Andrei is available for hire

Andrei Cioara

Verified Expert in Engineering

Python Developer

Location

London, United Kingdom

Toptal Member Since

March 18, 2019

As an engineer, Andrei enjoys making software run as fast as the hardware allows. Holding a master of engineering degree from Imperial College London, Andrei excelled in his studies and graduated with a first class honors distinction. Andrei has previously worked at Microsoft, Palantir Technologies, Citadel Securities, and Jump Trading.

C++SQL Java Python React Chrome Extensions Linux Bootstrap Django Algorithms Python 3 Python 2 JavaScript 6 JavaScript 5 C++11 Firefox Extension Electron.js CircleCI

Portfolio

Citadel Securities

Python, C++

Jump Trading

Full-stack, Back-end, Front-end, D3.js, Redux, React, JavaScript, Python, C++

Palantir Technologies

D3.js, JavaScript, TypeScript

Experience

Linux - 7 years SQL - 7 years C++ - 7 years Java - 6 years JavaScript - 6 years Python - 4 years Chrome Extensions - 4 years React - 2 years

Availability

Part-time

Preferred Environment

Amazon Web Services (AWS), Git, Bash, C++, Python, JavaScript

The most amazing...

...business I've built is Officeroo, alumnus of YCombinator's Startup School and invited for interviews for the W19 batch.

Work Experience

Software Engineer

2018 - 2018

Citadel Securities

Developed custom Python and C++ software for the European Options Market Making desk.

Technologies: Python, C++

Software Engineer

2016 - 2018

Jump Trading

Wrote fast-path C++ code for exchange connectivity and order placing.
Ported legacy C++ software to web technologies using React, D3.js, Django, and Tornado.
Developed a highly robust multithreaded PyQt application that runs on 400+ trader desktop machines.

Technologies: Full-stack, Back-end, Front-end, D3.js, Redux, React, JavaScript, Python, C++

Software Development Engineering Intern

2015 - 2015

Palantir Technologies

Improved the JavaScript code performance by 400x (average) for one of our main users.
Contributed to the API design for the 1.0 release of PlottableJS (Palantir's largest open source project at the time).
Improved the tooling for the team and reduced build times by up to 30%.

Technologies: D3.js, JavaScript, TypeScript

Freelance Web Developer

2013 - 2015

CoLake Care + PeopleGraph

Developed custom CSS pixel-perfect designs from Adobe Illustrator designs.
Implemented the full-stack of a Laravel (PHP) application, deployed it to production on AWS and used with trial patients.
Created a Google Chrome extension that improves the social network experience for recruiters.

Technologies: Chrome Extensions, CSS, JavaScript, PHP

Software Development Engineering Intern

2014 - 2014

Microsoft

Developed an iOS app for the customer relationship management team, Microsoft Dynamics.
Wrote a C# MVC application with a REST API which later served as a data source for the iOS app.
Researched the new capabilities of iOS 8 in anticipation for the September 2014 launch.

Technologies: iOS, Objective-C, JavaScript, C#

Software Development Engineering Intern

2013 - 2013

Geonomics

Developed Java code for the full-stack of Geolotto.co.uk.
Wrote custom CSS rules that ensured cross-browser compatibility all the way to IE6.
Received a special end-of-internship bonus and return offer in recognition of my great work.

Technologies: Java

Experience

Officeroo

I was responsible for the product architecture, React-based front-end, Django back-end, AWS management, and more. I also managed sales and marketing; including the launch of our product with four beta clients and managing a team of three. We graduated from YCombinator’s Startup School and was invited to the YCombinator interviews, class of W19.

Cashflow

This was a personal project for managing personal finances. The app also connects to external APIs for fetching market data. It was written using React, Redux, and Chart.js.

Palindrome

Palindrome is a superior replacement for Mac's Finder or Window's Explorer. The features include the following: copy, move, delete, mkdir, mkfile, archive, extract, and synchronize.

I developed this cross-platform two-pane file manager written in Electron.js; using React, Redux, Bootstrap, Redux-Thunk, and Electron.js.

Leetcode.com Community Author

https://leetcode.com/articles/power-of-three/

I wrote five-star editorial articles for software interview questions. It received 50,000 to 100,000 views/article along with positive feedback. The written sample solutions are in Java.

Technology & Lifestyle Blog

On this blog, I am the sole owner and editor. On average, I received 10,000+ views per article. My articles frequently trend on Reddit.com/r/programming and News.ycombinator.com; these articles have also been picked up by other syndication websites.

Personal Website

https://andrei.cioara.me

It has the best SEO. This site was boosted to #1 on both Google and Bing for the keyword "Andrei Cioara" (It has since fallen to #2 as my own blog topped #1). I also designed the custom look and feel for both phone and laptop using plain CSS3 and HTML5.

Flappy Froggy

I built this mobile game in Java and published it to the Google Play Store. I collaborated with a talented artist to create game graphics and written the entire physics engine from scratch. The game grossed about £10 with minimal promotion.

Skills

Languages

Python, Python 3, Python 2, JavaScript, JavaScript 6, JavaScript 5, C++, C++11, Java, HTML, HTML5, CSS, CSS3, C, SQL, Java 6, Java 7, HTML4, Bash, Bash Script, TypeScript, C#, Objective-C, PHP, Haskell

Libraries/APIs

jQuery, React, React Redux, Pure CSS, Node.js, Python API, JavaScript Charting, Django ORM, HTML5 APIs, Reactstrap, jQuery CDN, Stripe API, Plottable.js, D3.js, Redux Form, GitHub API, JavaScript API for Chrome, Moment.js, PyQt, PyQt 5

Tools

GitHub Pages, JavaScript Debugging, JavaScript Toolchain, GitHub, Chrome Developer Tools, Webpack, Webpack 2, Webpack 4, Webpack 3, Git, Redux Thunk, Jenkins, Travis CI, CircleCI, GitLab, GitLab CI/CD

Platforms

Google Chrome, Android, Linux, Amazon EC2, Firefox, Amazon Web Services (AWS), Windows, iOS

Storage

JSON, MySQL, PostgreSQL, SQLite, Amazon S3 (AWS S3)

Other

Data Structures, Algorithms, Technology, HTML UI, CSS Grid, Bootstrap UI, Chrome Extensions, Finance, Sorting Algorithms, Writing & Editing, Front-end, Back-end, Full-stack, Tornado, Firefox Extensions, Entrepreneurship

Frameworks

Django, React Native, Redux, Electron, Bootstrap, Bootstrap 3, Bootstrap 3+, Bootstrap 2, Laravel, Chrome, Express.js

Paradigms

HTML DOM, Agile Software Development, Test-driven Development (TDD), Continuous Delivery (CD), Continuous Integration (CI)

Education

2015 - 2016

Master's Degree in Software Engineering

Imperial College London - London, UK

2012 - 2015

Bachelor's Degree in Computing

Imperial College London - London, UK

Certifications

JULY 2017 - PRESENT

Mensa Member (High IQ Society)

American Mensa

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