Sergei Solod | Senior Frontend Developer Portfolio

About

Senior Frontend Developer

Senior Frontend Developer with backend knowledge (6+ years full-time) and a deep understanding of developing complex projects in e-commerce product startups. I've developed about 20 commercial projects from idea to release, used by hundreds of thousands of people, and refactored many projects from outdated to modern technologies. Proficient in JavaScript, TypeScript, React, Redux, CSS, and other technologies. I can write e2e (Cypress) and unit tests (Jest). I have experience with backend technologies: Node.js, Express, MongoDB. I love learning and can quickly pick up any technology you need.

Work Experience

Experience

Developed and maintained Vue, React, JS, TS tasks of any complexity, refactoring, supporting the frontend of all company and partner projects: online stores, widgets, showcases, admin panels, gift certificates.
Developed three large admin panels from scratch in a short time, allowing clients to manage their products and personal accounts themselves, previously done through managers and programmers, saving hundreds of employee hours.
Developed a new UI kit, which allowed updating the company's design, making products visually appealing.
Wrote autotests for existing projects with cypress.js, which helped find and fix bugs, increasing project stability.
Developed a fullstack frontend logging service (React.js frontend, Node.js backend, MongoDB). Implemented log collection and sending in all frontend projects, allowing early detection and correction of frontend errors.
Integrated Artificial Intelligence into company products, created fullstack JavaScript applications for generating AI images and congratulatory texts for gift certificates, which differentiated the product in the market and increased functionality and sales.
Made an AI bot that responds to user messages, this reduced the load on the support center and greatly reduced costs.
Developed a training platform for Alfa-Bank employees on demand from Alfa-Bank, and an online store with a referral program on demand from Belis.

Developed about 15 complex SPA projects from scratch (admin panel, online store, widgets, payment system, B2B/B2C platforms, iframe projects embedded into partner websites) from idea to release, using Scrum. These projects are used by tens of thousands of people and generate main revenue.
Reworked 5 large old projects from outdated technologies (PHP 5, Vue 1, jQuery) to new ones (TypeScript, React, Redux), reducing feature implementation time and saving thousands of development hours.
Supported all projects, including legacy code, fixed bugs, implemented features, improved existing projects, regularly reviewed and refactored code, which increased sales and improved reputation.
Took full responsibility for most projects, participated in architectural design. Many fundamental decisions were made by me, such as the choice of technologies, programming language, architecture, allowing the use of the latest technologies and best development practices.
Onboarded middle-level employees, recruited team members, conducted technical interviews, made training videos for my team and for company clients. This allowed new employees to quickly join the team and contribute.
Conducted SEO optimization of our React projects (NextJS, PHP), allowing them to appear more frequently in search results and attract more clients.
Developed many different and complex email templates, implemented WebSocket in project code, token-based authorization, developed two UI kits, added new complex and modern animations for all projects, implemented third-party integration with partner projects.
Implemented user interaction-improving features in projects: email autofill, phone input mask with country flags, image cropping, multiple form validation, error and hint display, automatic data replacement, project localization.
My projects had 85% test coverage (unit testing Jest, e2e testing Cypress), which reduced the number of bugs due to their quick detection, making the project stable.
Adapted projects for different browsers (Safari, Firefox, Chromium), different operating systems (macOS, Linux, Windows), and different devices. Solved problems arising in each specific browser and operating system.

Developed a project (React) that displays restaurants on maps, restaurant menus, and allows ordering from restaurants (the main business idea).
As part of the team, I participated in the architectural development of the future project. I proposed ideas that were implemented and reduced server load, increasing project performance.
Fixed bugs on the main website, implemented many features, which improved reputation and increased the number of clients; I developed websites for our partner restaurants.
My projects had 50% test coverage (Jest), which reduced the number of bugs due to their quick detection, making the project stable.
Conducted SEO optimization of our projects, allowing them to appear more frequently in search results and attract more clients.
Implemented user interaction-improving features in projects: email autofill, phone input mask, validation of all data, display of errors and hints, integration of restaurants with Google Maps.

Developed many websites for my clients, allowing them to have an online presence, sell services, increase revenue and sales, and improve reputation.
Supported my clients' websites, fixed errors and bugs, added new features, and also supported CMS platforms: WordPress, Wix, Joomla. This increased sales and improved user perception of the product.

Education

Academic Background

Skills

Core Stack

JavaScriptTypeScriptReactNextJSVue3ReduxVuexCSS3HTML5SassJestCypressNode.jsExpressMongoDBWebpackViteGulpDockerREST APIWebSocketMaterialUIVuetifyjQueryBootstrapBEMGitOpenAILinuxWordpressJoomlaWixFigmaZeplinSEOUI/UX

My Projects

Selected Work

Pet Projects

AI character platform for learning, creative scenarios, and safe text conversations with curated personas, 12+ characters, 313+ illustrations, moderation, and multilingual interactive experiences.

Next.jsTypeScriptNode.jsMongoDB

Hi, I'm Sergei.

Senior Frontend Developer

Video resume

Experience

Academic Background

Core Stack

Selected Work

Pet Projects

MGC Projects built from scratch by me

Charts admin

MGC Projects I worked on

Digift Projects built from scratch by me

Group Purchase App

Group Purchase Tracking

Email Templates

Payment System

UI-kit

Conference Gift App

Card Balance Checker

Digift Projects I worked on

Digift Partner Admin Panel

Digift.me exchange shop

Contact me

Have a project, role, or technical problem worth discussing?