Krystian Czekaj

• Developed advanced web applications using React and TypeScript, focusing on performance optimization and code quality. • Integrated Vite for efficient building and rapid hot module replacement, enhancing development productivity. • Utilized Docker to ensure consistent deployment, facilitating a smooth workflow from development to production. • Managed a microservices architecture, ensuring scalable and maintainable back-end solutions.

• Developed the back-end and API for the social media application Skykick. • Created an eCommerce platform using AWS. • Developed front-end solutions with React. • Designed a CMS for managing the company's invoices and employees using React and GraphQL. • Developed a custom responsive drag-and-drop calendar/note/appointment system with React, streamlining user experience. • Implemented a car location tracking system for calculating potential banner revenue based on impressions in a React Native application.

• Developed a headless CMS using React.js, Node.js, and Strapi. • Enhanced a SaaS platform using Vue.js, Vuex, and the Vuetify framework. • Updated and added new RESTful APIs using Apollo GraphQL and AWS Lambda functions. • Improved search algorithm efficiency and architecture. • Integrated Aherf service for SEO and implemented JSON-LD for enhanced search user experience. • Increased CTR based on A/B testing results. • Integrated a payment gateway (Stripe API) and localized content using i18n.

• Implemented a comprehensive test suite including Cypress, Jest, Enzyme, and Supertest, enhancing overall software reliability. • Managed and updated a bespoke YAML content parser, serving as a headless CMS. • Integrated React Router for improved application performance and analytic tracking. • Provided mentorship to junior developers, emphasizing engineering best practices and technical standards.

• Migrated an AngularJS codebase to React. • Implemented full-text search using Elasticsearch. • Developed live content reloading features using socket.io. • Created a React front-end admin dashboard for data visualization. • Extensively used Google Cloud Platform services including Google Storage, BigQuery, Speech-to-Text API, and Firebase.

• Contributed to the development of an enterprise-level Supply Chain and Logistics web application using Angular and TypeScript. • Collaborated using Slack and Azure DevOps for effective project management. • Implemented complex features for managing various logistics components.

• Contributed to a project used by notable clients such as McKesson and AWS. • Employed Agile software development methodologies, including Scrum. • Engineered a system integrating ODBC & TypeScript deserialization for use in an Angular-based frontend. • Developed a scheduling interface with D3.js, enhancing user interaction with appointments.