Tomasz Lewandowski

- Upgraded SaaS with VueJS, Vuex, and Vuetify for better performance. - Built headless CMS using React, Node.js, and Strapi. - Improved search logic and architecture, boosting efficiency by 30%. - Integrated Apollo GraphQL with AWS Lambda and added new REST APIs. - Enhanced SEO with Aherf and JSON-LD, raising CTR by 24% via A/B tests. - Set up Stripe payments and localized the app using i18n. - Switched from localStorage to Vuex for state handling.

- Improved a FinTech platform in the Frontend side and API implementation in React - Developed mobile app from desktop web version with Firebase - Added 30+ components to be used in global app by using styled-components - Redesigned global state management system with Redux thunk - Simplified and improved UX from new design - Improved performance by optimizing codes with modern JS and api handling - Developed Admin panel with React and Node

- Led tech direction for a cloud-based app using Node.js, PDFJS, MongoDB, and MS SQL, integrating with a proprietary framework. - Developed front end with JavaScript, ES6, React, Redux-Saga, and RESTful services. - Built services for insurance rate summaries using REST, WSDL, SOAP, and XML parsers. - Designed SQL Server DBs with tables, triggers, stored procedures, and views.

- Expertise in analyzing the Document Object Model (DOM) Layout, DOM Functions, and Java Script functions, Cascading Styles across cross-browser using Fire Bug, Developer Tool Bar - Experience in ReactJs Libraries like redux thunk, redux saga - Experience with modern build tool chains, like JavaScript frameworks/technologies such as Express.js, Angular.js, React.js, MobX or Flux.js - Good Experience in React Js for creating interactive UI's using One-way data flow, Virtual DOM, JSX, React Native concepts