Sergey Lapin, Developer in Freiburg im Breisgau, Baden-Württemberg, Germany
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Sergey Lapin

Verified Expert  in Engineering

Web Scraping Developer

Freiburg im Breisgau, Baden-Württemberg, Germany
Toptal Member Since
December 3, 2015

Sergey is a passionate and experienced full-stack web developer specializing in creating robust and scalable MEAN-based applications. Not limited to this field, he's also quite adept with Ruby on Rails, testing automation, web scraping, and many other adjacent fields. Sergey is a perfectionist when it comes to code quality and enjoys communicating with his colleagues.


Express.js, Node.js, MongoDB, AngularJS
JavaScript, jQuery, Sinatra, Ruby
JavaScript, jQuery, Socket.IO, Node.js




Preferred Environment

Google Chrome, Sublime Text, Linux Mint

The most amazing...

...project that I've created is an automated build server that prepares custom (patched) Node.js assemblies.

Work Experience

Software Engineer (Freelance)

2015 - PRESENT
  • Developed the back-end (MongdoDB, Node.js) and the front-end (AngularJS) features.
  • Implemented the the CI system, optimization of the code, and the testing of the framework for the front-end and back-end.
Technologies: Express.js, Node.js, MongoDB, AngularJS

Software Engineer (Freelance)

2014 - PRESENT
  • Worked on a Ruby (Sinatra)-­based web application.
  • Built pieces to help with back-end functionality as well to help with the user interface.
  • Integrated new tools into the CI chain to maintain code quality.
Technologies: JavaScript, jQuery, Sinatra, Ruby

Software Engineer

2013 - 2015
  • Created a testing automation laboratory, admin panel, and the testing automation framework (end to end).
  • Developed an automated build and deployment server.
  • Performed stress testing of Socket.IO connection and load testing.
  • Aided in the full-stack JavaScript development (Node.js, jQuery stack, and Socket.IO).
Technologies: JavaScript, jQuery, Socket.IO, Node.js

Number Parser
A simple natural language processing (NLP) library for parsing numbers. This JavaScript code turns numbers in the written word into actual numbers.


JavaScript, Ruby


Node.js, Socket.IO, jQuery, PhantomJS, React, SoundCloud API, VK API


MEAN Stack, Functional Programming


MongoDB, MySQL


Web Scraping, Scraping


Express.js, AngularJS, Sinatra, Ruby on Rails (RoR)


Sublime Text 3, Sublime Text


Linux Mint, Google Chrome

2006 - 2012

Master of Science (MSc) Degree in Radio Physics and Data Transmission Systems

Lobachevsky State University of Nizhny Novgorod - Nizhny Novgorod, Russia

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