Sergii Selezen profile photo

Sergii Selezen

Front-End Software Engineer 10+ YOE | React, UI Architecture, Web Accessibility | SaaS, E‑Commerce, and Marketing Platforms

United States
100+ connections
Sergii Selezen on LinkedIn

Updated 7 months ago

13+

Years Experience

5

Roles

51

Skills

1

Education

About

👋 Hi there! I'm a Front-End Software Engineer with 10+ years of experience turning ideas into real, working products — from scrappy MVPs to complex, stable platforms used by thousands. I'm always curious about meaningful projects — whether it's an early-stage startup with a bold idea or a mature product with room to grow. What drives me? Clean, understandable code. Solid architecture. And building interfaces that just feel good to use. 🛠️ Over the years, I’ve: Built a custom UI Kit (with Storybook) that helped scale a platform and speed up development Designed and developed the entire front-end for a 3D fashion-tech MVP — which helped the team land early investment Worked closely with designers to improve mobile UI for a high-traffic social discovery platform, leading to stronger mobile engagement Designed and refined marketing email campaigns that supported user acquisition and boosted conversion Mentored teammates and helped set up smoother development processes Improved accessibility and saw the real-world impact it had on users 🤝 I’ve had the chance to mentor junior and mid-level developers, support their growth, and share best practices. I enjoy working in cross-functional, globally distributed teams, where clear communication and shared ownership really matter. 💡 I enjoy solving product challenges with thoughtful front-end solutions — and working alongside people who care about what they’re building. 🧰 Tech Stack: JavaScript, TypeScript, HTML5, CSS3, SCSS, CSS Modules, React, Redux, Angular.js, WebRTC, Three.js, Node.js, REST APIs, Storybook, Tailwind CSS, Bootstrap, jQuery, Figma, Sketch, Photoshop, WCAG, ARIA, Webpack, Gulp, NPM, Git, CI/CD, GitHub Actions, TeamCity, Jira, Scrum, Kanban, Jest, ESLint, AWS basics, Pixel Streaming, Lighthouse, PageSpeed Insights

Experience (5 roles)

7 yrs 9 mos

Senior Software Front-End Engineer

Current

7 yrs 9 mos

Feb 2022 - Present · 3 yrs 7 mos·Brookline, Massachusetts, United States · Remote

Led front-end development for SignNow, a high-load e-signature and digital workflow platform used by millions of individual and enterprise users. Played a key role in modernizing the application’s architecture, improving UX/UI, and scaling the front-end infrastructure. Key contributions: Design Sy...

BODS  · Part-time

Senior Frontend Developer

BODS · Part-time

Jan 2022 - Dec 2022 · 1 yr·Los Angeles, California, United States · Remote

At BODS Inc., I led the front-end development of the company’s first web interface, translating the startup’s concept into a working product from the ground up. This foundational work directly contributed to securing early-stage investment. I built a real-time interactive UI that integrated Pixel S...

7 yrs 9 mos

Front-End UI Engineer

7 yrs 9 mos

Dec 2017 - Feb 2022 · 4 yrs 3 mos·Brookline, Massachusetts, United States · Remote

Worked on the core front-end of SignNow, a high-load e-signature and document workflow platform used by millions. Focused on transforming legacy codebases into scalable, maintainable, and user-friendly interfaces. Legacy Stack Migration: Initiated and executed the migration from AngularJS + Bootstr...

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Education (1)

Kharkiv National University of Radio Electronics

Kharkiv National University of Radio Electronics

Sep 2006 - Jul 2010

Skills (51)

CI/CDWebpackWebrtcLESS (Stylesheet Language)HTML5ReactCSS3JavaScriptTailwind CSSReactRangeHTML5jQueryCSS3Vue.jsAngularStorybookContrastGitFlowTypeScriptWebpackFigmaJiraRoomStorybookReduxAngularNode.jsjQuerySketchGitHubTeamCityJestESLintAWSTailwind CSSScrumSCSSPixel StreamingWeb Content Accessibility Guidelines (WCAG)React.jsGulp.jsCSSSASSJavaScriptFigmaTypeScriptGitJiraVue.js
Languages (3)
Ukrainian(Native or bilingual proficiency)Russian(Native or bilingual proficiency)English(Professional working proficiency)

Frequently Asked Questions

What is Sergii Selezen's current role?
Sergii Selezen is currently working as Senior Software Front-End Engineer at 7 yrs 9 mos.
Where did Sergii Selezen study?
Sergii Selezen studied Bachelor's degree, Applied Mathematics at Kharkiv National University of Radio Electronics.
What skills does Sergii Selezen have?
Sergii Selezen's top skills include CI/CD, Webpack, Webrtc, LESS (Stylesheet Language), HTML5. They have 51 skills listed on their profile.
Where is Sergii Selezen based?
Sergii Selezen is based in United States.

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