Piotr Janeczko

- Led ERP system dev with Next.js, Redux Toolkit, MUI, react-hook-form, and AWS Cognito - Built Fintech app with Vue 3, Composition API, Tailwind CSS, Keycloak, Vuex, and Vue Router - Boosted performance with smart RESTful API design, lazy loading, and CDN font integration - Deployed serverless backend on AWS using Lambda, API Gateway, S3, DynamoDB, EC2, and Cognito - Integrated Stripe for secure, smooth in-app payments

- Redesigned the database and API for a large app to boost performance and scalability. - Mentored junior developers on debugging, clean code, and frontend best practices. - Performed security audits, fixed vulnerabilities, and improved overall app security. - Modernized the tech stack from jQuery to React and Vue, using Flux, Vuetify, and Semantic UI. - Set up CI/CD pipelines with GitLab to automate testing and deployment.

- Implemented DOM manipulation and event handlers across various web browsers while ensuring cross-browser compatibility. - Implemented Redux Saga to manage side effects and improve the efficiency of application state management. - Maintained the AngularJS based cloud service marketing platform with .NET Framework for backend. - Developed hybrid mobile apps using React Native with Google Store and Apple Store publish.

- Managed application state effectively using both server-side and client-side state management options, ensuring data consistency and a smooth user experience. - Wrote JavaScript code to enhance page functionality and implemented jQuery plugins like Lightbox for interactive elements. - Developed and maintained several responsive web apps and pages, focusing on accessibility and usability across different devices.