About Me
Frontend Developer with 7+ years of experience building scalable, high-performance web applications. Proven expertise in React.js, Next.js, and SSR, with measurable results such as reducing customer inquiries by 80% and boosting sales by 4-5%. Skilled in leading teams, optimizing performance, and delivering impactful solutions in international and Agile environments.
- 80% reduction in customer service inquiries through product returns automation
- 4-5% sales increase by modernizing product pages with React and SSR
- 10-15% faster page loading through Cloudflare and GraphQL optimization
- Led international team implementing Mabaya advertising system integration
- Mentoring junior developers, participating in recruitment and onboarding processes
- Comprehensive redesign of the main Header component in alignment with new layouts and business requirements, development of dedicated management services, and implementation of custom SSR rendering with advanced microservice integration logic
Experience
7+
years
Companies
5
employers
Technologies
30+
tools
Work Experience
Front End Developer
Empik Group
Development and maintenance of e-commerce platform serving millions of users monthly.
- •Automated and streamlined the process of handling product returns and complaints, reducing customer service inquiries by over 80%
- •Rebuilt legacy homepage and product pages with React and custom SSR, introducing modern design that improved performance and boosted sales by 4-5%
- •Optimized SSR using Cloudflare and GraphQL, reducing page load time by 10-15% and improving Core Web Vitals metrics (CLS, FID, LCP)
- •Maintained and scaled a custom CMS for seamless content updates
- •Integrated external systems: InPost, LeaseLink, and PayPo
- •Built web applications with React.js, Next.js, TypeScript, and Ant Design, translating Figma designs into responsive interfaces
- •Led the implementation of a custom ads system with Mabaya integration in collaboration with international team
- •Conducted testing with Jest and Playwright to ensure cross-browser compatibility
- •Mentored interns and new employees, assisting in their onboarding and acclimatization
- •Participated in recruitment processes, contributing to evaluation and selection of new team members
- •Collaborated with DevOps teams to integrate Dockerized applications into CI/CD pipelines using Jenkins
- •Collaborated in Agile teams, performing code reviews and ensuring high-quality standards
React.jsNext.jsTypeScriptAnt DesignGraphQLCloudflareSSRJestPlaywrightDockerJenkins
08/2021 - present
Warsaw
Front-End Developer
Mobica
Development of IoT solutions with voice assistant integration.
- •Built IoT solutions enabling voice-command product searches and interactions, integrating Amazon Alexa and Google Actions Console
- •Developed IoT solutions, enabling voice-controlled product interactions via Amazon Alexa and Google Actions Console
- •Resolved authentication issues in React SPAs using Okta services
- •Built a responsive dashboard application with React.js, Redux, REST API, SASS, and Webpack
- •Focused on creating user-friendly interfaces and ensuring cross-platform functionality
- •Collaborated within Agile/Scrum teams to deliver features on time
- •Participated in technical discussions, sprint planning, and code reviews
React.jsTypeScriptNode.jsReduxAmazon AlexaGoogle ActionsDialogflowOktaREST APISASSWebpack
03/2021 - 07/2021
Lodz
Front-End Developer
MDBootstrap
Development of React components for rapid website and application creation.
- •Developed React components for creating websites and applications using quick-use blocks with Material Design elements
- •Implemented regular data updates to ensure accuracy and up-to-date information
- •Refactored code using React.js, Webpack, SASS, HTML, and Bootstrap to improve performance and maintainability
- •Actively participated in Scrum meetings, contributing to sprint planning
- •Managed and updated packages, ensuring compatibility and efficient software releases
- •Identified and resolved bugs, improving system stability and user experience
React.jsMaterial DesignWebpackSASSBootstrapHTML
09/2019 - 03/2021
Warsaw
Front-End Developer
Devapoo
Building web solutions using IBM technologies.
- •Built web solutions using IBM technologies, including a timesheet application for a major telecom company
- •Enhanced business processes and front-end functionality with Vue.js and jQuery
- •Resolved critical bugs, improving system stability and user experience
Vue.jsjQueryIBM Technologies
06/2019 - 09/2019
Warsaw
Junior Front-End Developer
MDBootstrap
First commercial experience in web component development.
- •Built reusable components using React, jQuery, Bootstrap, and REST API, improving design consistency
- •Fixed bugs and implemented solutions to improve application performance
ReactjQueryBootstrapREST API
06/2018 - 06/2019
Warsaw
Skills
Frontend
JavaScriptTypeScriptHTMLReact.jsNext.jsReact QueryZustandReduxCSS-in-JS (Emotion, styled-components)CSSBEMSCSSLESSAnt DesignDaisyUIMUITailwindCSSBootstrapReact Testing LibraryRWD
Backend
Node.jsExpress.jsREST APIGraphQLMongoDBMongooseRedisBullMQStripeJWTOAuth2CSRFWebSocketsDockerBull BoardQueue workersWebhook handlingCI/CDJenkinsAPI securityError trackingPerformance monitoring
Architecture
MicroservicesMicrofrontendsEvent-driven systemsData-Driven DevelopmentModular monolithClean ArchitectureScalability & concurrency management
Tools
JestPlaywrightCypressSentryGrafanaWebpackBabelDockerBull BoardGITFigma
Other
SSR (Server-Side Rendering)CloudflareFreemarkerAgile/ScrumCI/CDCode ReviewMentoringPerformance optimizationSecurity best practices
Education
Engineer
Civil Engineering
University of Ecology and Management
10/2012 - 05/2017
Warsaw
Languages
Polish
Native
Native Speaker
English
B2+
Professional Working Proficiency