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Sergey Mostsevenko Email & Phone Number
R and D Software Engineer
at
Variant Group
LinkedIn matched
✓ Verified August 2026
3 data sources
Profile completeness 86%
Current company
Role
R and D Software Engineer
Location
Seoul, South Korea, Korea, Republic of
Company size
Who is Sergey Mostsevenko? Overview
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Quick answer
Sergey Mostsevenko is listed as R and D Software Engineer at Variant Group, a with 24 employees, based in Seoul, South Korea, Korea, Republic of. AeroLeads shows a matched LinkedIn profile for Sergey Mostsevenko.
Sergey Mostsevenko previously worked as Staff Software Engineer at Fingerprint and Co-founder & Lead Web Developer at Aiger. Sergey Mostsevenko holds Bachelor'S Degree, Information Technologies And Systems from Far Eastern Federal University.
Company email context
Email format at Variant Group
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Variant Group
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Profile bio
About Sergey Mostsevenko
I'm a software engineer highly experienced in Web Development. I've got some talent, which is confirmed by my top 0.09% LeetCode contest status (see the LeetCode profile link down the text) and contest prizes (see the Honors & Awards section of the page).I've been working commercially since 2011. I have large experience of creating, developing and maintaining complex projects alone and as a team/tech leader.I have a vast experience and skills in:– Remove work. I've been working remotely almost whole my career and I love working remotely.– Frontend development with native JavaScript, TypeScript, React, Redux, Redux Saga, AJAX, HTML, CSS, Sass, Stylus, jQuery.– Frontend development automation with Webpack, Gulp, Babel, Rollup, Jest, Jasmine, Mocha, ESLint.– Backend development with Node.js, PHP, Laravel, Slim, Lumen, REST.– Relation database usage: SQL language, PostgreSQL, ClickHouse, MySQL.– Unit, e2e and integration testing: Jest, Jasmine, Karma, PHPUnit, BrowserStack Automate.– Slicing graphics mockups into responsive HTML mockups. I worked with Photoshop, Illustrator, Sketch, Figma.– Git VCS.– Maintaining open-source projects.I have a moderate experience in:– Frontend development with Next.js, Twitter Bootstrap, Angular, RxJS (I wouldn't like to work with Angular).– Backend development with Node.js, Go and Python.– No-SQL database usage: MongoDB, Redis.– Hybrid mobile development with Cordova, Ionic and Capacitor.– Cloud development: AWS S3, CloudFront, Lambda, CloudWatch.– Monitoring: Datadog, Rollbar.– Building desktop applications with Electron.– Linux administration.– Agile & Scrum.– Setting up continuous integration and deployment with Travis CI, GitLab CI, GitHub actions.– Parsing websites.– Team leadership.See my profiles on other resources:– https://github.com/Finesse– https://leetcode.com/u/Finesse– https://stackoverflow.com/users/1118709– https://medium.com/@surgie.finesse
Current workplace
Sergey Mostsevenko's current company
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Variant Group
8 roles
Sergey Mostsevenko work experience
A career timeline built from the work history available for this profile.
R And D Software Engineer
Staff Software Engineer
Fingerprint (ex FingerprintJS) is a company with employees all over the world, providing online security solutions for b2c businesses. I solve various problems related to TypeScript, Golang and infrastructure both on frontend and backend. I'm the technical lead of these projects:– JavaScript Agent. It's a library that customers install on their websites to use Fingerprint (both the Open-Source and the Pro versions). I develop the project to meet the company and customers' needs, solve open-ended problems (e.g. bypassing ad-blockers, optimizing the performance and protecting the company's intellectual property), keep the project in good shape by following the best practices, make related backend changes (by myself and collaborating with backend developers), develop the infrastructure around the project, research new browser data retrieval methods, write internal and public documentation, and write blog articles. You can see Open Agent at https://github.com/fingerprintjs/fingerprintjs (it's a tip of the iceberg of Pro Agent technologies) and my articles at https://fingerprint.com/blog/author/sergey-mostsevenko/.– CDNs that deliver the company's Open-Source libraries and customized Pro Agent code from NPM to customers' websites with little latency. These are AWS serverless services that interact with other company's services. See the code for the Open-Source CDN at https://github.com/fingerprintjs/cdn.Besides that I participate in a Scrum process, perform technical interviews, mentored other developers, and was a team leader at some point (until my team got merged into another team).
Co-Founder & Lead Web Developer
Fullstack web development on occasional basis (see the projects section for more information)
Sep 2015 - Dec 2022
Senior Full Stack Developer
Anyway Labs
I participated in various studio projects. I both made projects from scratch and maintained old projects. I worked with:– React & Redux– Angular & RxJS– Cordova & Ionic– TypeScript– Node.js & Express & Koa– Mongo DB– PostrgeSQL– Python & SQLAlchemy & Marshmallow & Django & serverless
Oct 2019 - Aug 2020
Senior Frontend Developer
The company makes full featured cryptocurrency exchanges. I did the frontend scope of the job as a part of a team of developers, a designer and a project manager. I maintained and extended the current company projects and developed new projects. I used TypeScript, React, Redux, Redux Saga, Webpack, Sass and many auxiliary tools. Also I participated in the Scrum working process and code reviews.You can see some projects I participated in the portfolio section
Sep 2018 - Sep 2019
Senior Software Developer
Kvartira Today
Full stack web and desktop development (see the projects section for more information)
Jun 2017 - Aug 2018
Front End Web Developer
Brand Agency «Partner»
I converted graphic mockups to adaptive and responsive HTML mockups and developed multiple scripts using JS and PHP.
Sep 2014 - Aug 2015
1 education record
Sergey Mostsevenko education
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Far Eastern Federal University
FAQ
Frequently asked questions about Sergey Mostsevenko
Quick answers generated from the profile data available on this page.
What company does Sergey Mostsevenko work for?
Sergey Mostsevenko works for Variant Group.
What is Sergey Mostsevenko's role at Variant Group?
Sergey Mostsevenko is listed as R and D Software Engineer at Variant Group.
Where is Sergey Mostsevenko based?
Sergey Mostsevenko is based in Seoul, South Korea, Korea, Republic of while working with Variant Group.
What companies has Sergey Mostsevenko worked for?
Sergey Mostsevenko has worked for Variant Group, Fingerprint, Aiger, Anyway Labs, and Qoden Technologies.
Who are Sergey Mostsevenko's colleagues at Variant Group?
Sergey Mostsevenko's colleagues at Variant Group include Shahab Akhtar.
How can I contact Sergey Mostsevenko?
You can use AeroLeads to view verified contact signals for Sergey Mostsevenko at Variant Group, including work email, phone, and LinkedIn data when available.
What schools did Sergey Mostsevenko attend?
Sergey Mostsevenko holds Bachelor'S Degree, Information Technologies And Systems from Far Eastern Federal University.
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