Seva Rybakov, Developer in Denpasar, Denpasar City, Bali, Indonesia
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Seva Rybakov

Verified Expert  in Engineering

Software Developer

Denpasar, Denpasar City, Bali, Indonesia
Toptal Member Since
September 6, 2015

Seva is an experienced full-stack web developer specializing in Ruby and JavaScript-related technologies. He delivers clean, test-driven code and is comfortable with both back-end and front-end parts of the stack. In addition, Seva also has a solid Linux background and can set up servers and deploy applications.


Online Freelance Agency
Amazon Web Services (AWS), Tmux, Vim Text Editor, Git, MongoDB, Backbone.js...
Web3, Ethers.js, Solidity, Hardhat
Ruby on Rails (RoR), Ruby, Test-driven Development (TDD), Tailwind CSS...




Preferred Environment

Git, Tmux, Vim Text Editor, OS X

The most amazing...

...thing I've built is a charity auction where people place bids in order to meet each other. The profits of the auction then went to charity.

Work Experience

Expert Mentor

2014 - PRESENT
Online Freelance Agency
  • Mentored in over 200 sessions for over 50 clients.
  • Accrued an average rating 5.0! 100% satisfaction.
  • Helped people solve their bootcamp/university coding problems.
  • Helped several startups with their tough coding challenges.
  • Gave advice in back-end, front-end, and server-side applications.
Technologies: Amazon Web Services (AWS), Tmux, Vim Text Editor, Git, MongoDB, Backbone.js, jQuery, CSS, HTML, Node.js, JavaScript, Ruby on Rails (RoR), Ruby

Solidity Developer

2023 - 2023
  • Developed a suite of smart contracts for a lending platform.
  • Integrated multi-signature wallet as an owner of smart contracts.
  • Reached 80%+ test coverage of smart contract code, including multiple smart contract interactions.
Technologies: Web3, Ethers.js, Solidity, Hardhat

Senior Ruby on Rails Developer

2021 - 2022
  • Reached 100% unit test Ruby code coverage using RSpec.
  • Worked on an extensive and reusable view component library.
  • Developed a drag-and-drop survey creation interface and a back end to support it.
Technologies: Ruby on Rails (RoR), Ruby, Test-driven Development (TDD), Tailwind CSS, Stimulus, TypeScript

Team Lead

2020 - 2021
  • Designed and implemented a cutting-edge referral product recommendation system, enabling dental and skincare professionals to suggest products to their clients seamlessly.
  • Enhanced client satisfaction but also provided professionals with a revenue share based on their clients' purchases.
  • Implemented system enhancements to enable customization, deployment, and theming across multiple regions and product lines, making it adaptable and scalable.
  • Managed a distributed team of four highly skilled software engineers, effectively coordinating and guiding their remote collaboration.
Technologies: JavaScript, Node.js, Microservices Architecture, Shopify, Shopify Plus, Shopify Theme, Stripe, Shopify API, eCommerce, Next.js, APIs, Third-party APIs, Plugins, Page Speed Optimization

Full-stack Application Developer

2016 - 2020
Tatango, Inc.
  • Scaled the system and servers to send millions of SMS messages per hour reliably.
  • Developed a rich text editor in React with lots of custom components.
  • Worked on all kinds of caching to allow efficient CSV exports and table search/navigation.
Technologies: Ruby, Ruby on Rails (RoR), JavaScript, RSpec, Linux, MySQL, PostgreSQL, Front-end, Node.js, React, Amazon Web Services (AWS)


2013 - 2015
Be Worthwhile
  • Solely wrote the entire web application.
  • Developed a test-driven Ruby on Rails back-end.
  • Wrote all the CSS from scratch to match the designer's PSD.
  • Integrated with Google API, Facebook API, and Twilio API.
  • Set up the server and deployed the application with the help of Digital Ocean, Ubuntu Linux, NGINX, Unicorn, and Capistrano.
Technologies: CSS3, HTML5, jQuery, RSpec, Capistrano, Git, MySQL, Ruby on Rails (RoR), Ruby, Web Scraping


2011 - 2013
  • Created a text-translate widget, embeddable into websites using jQuery and ASP.NET WebService.
  • Worked on the transition from PSD to HTML.
  • Helped develop the financial website in Ruby on Rails.
  • Worked as a part of a big team on a J2EE web shop constructor site.
  • Worked as a full-stack Web Developer on a data charting application using Backbone.js and Ruby on Rails.
Technologies: Ruby on Rails (RoR), Ruby, jQuery, JavaScript, CSS, HTML, ASP.NET, Jakarta EE, Python

Red Rock Apps Website

I did PSD to HTML conversion for the website and localized it to 10 languages. Also deployed it to VDS.

Cent OS, Ruby on Rails, Capistrano, HTML5, CSS, JavaScript, jQuery, Git

Be Worthwhile

My startup. Ran out of money on the marketing side of things, so no users :(
2013 - 2015

Master's Degree in Computer Science

Belarusian State University of Informatics and Radioelectronics - Minsk, Belarus

2008 - 2013

Bachelor's Degree in Computer Science

Belarusian State University of Informatics and Radioelectronics - Minsk, Belarus


React, Twilio API, Underscore.js, jQuery, Node.js, Facebook API, Google API, Socket.IO, Shopify API, ZeroMQ, Backbone.js, Stripe


Git, RSpec, Capistrano, Tmux, Vim Text Editor, Adobe Photoshop, Ansible, Chef, Shopify Plus


Express.js, Sinatra, Ruby on Rails (RoR), Tailwind CSS, Next.js, Material UI, ASP.NET, AngularJS, Stimulus, Hardhat


Ruby, JavaScript, CSS, HTML5, SQL, TypeScript, GraphQL, Python, HTML, CSS3, Bash, Solidity


Test-driven Development (TDD), Responsive, Microservices Architecture, Automation


Linux, MacOS, Google Cloud Platform (GCP), Shopify, OS X, Jakarta EE, Amazon Web Services (AWS)


Redis, MongoDB, PostgreSQL, MySQL, Memcached


Front-end, A/B Testing, CSV, CSV File Processing, IMAP, WebSockets, eCommerce, Web Scraping, Analytics, Computer Science, Monorepos, Shopify Theme, APIs, Third-party APIs, Plugins, Page Speed Optimization, Web3, Ethers.js

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