- Established an asynchronous and efficient development environment with timely releases, achieving a 100% - 250% net sales volume increase yearly.- Architected 2 web applications and built the majority of their core features from scratch resulting in a lean and maintainable product that rapidly grew to 50k+ users while being profitable from day one.- Implemented a full set of PWA features, enabling 90%+ of the application features to work offline, almost doubling the adoption of the application on mobile devices.- Built a collaborative, offline-capable rich text editor from scratch with React, ProseMirror, and Firebase, used by authors to create 80k+ books.- Led a development team of up to 10 people, providing mentorship and learning plans while fostering a friendly and positive environment.

- Architected the product and implemented the majority of business-critical features using Next.js, React, Redux, Firebase, Node.js, Algolia, Stripe, ensuring rapid growth from 0 to 100K+ users while minimising the costs.- Developed a rich text editor powered by React, Firebase, and Slate.js, with a built-in LanguageTool integration for grammar, sentiment, and readability analysis, time tracking, distraction-free mode, managing 1K+ documents daily.- Refactored the design system across the entire application to use MUI, greatly improving codebase reusability and modularity, and reducing development time by 20-30%.

- Refactored the subscription model to a free trial using Stripe and Firebase, increasing the number of free-to-paid conversions by 30%-50% per month.- Set up an automated visual testing suite using Nightwatch.js and Saucelabs, decreasing the number of regressions in diagram rendering by 80%.

- Developed a low-code solution for retailers to integrate with the service, reducing engineering involvement in the integration of new clients by up to 90%.- Initiated a transition of a legacy codebase (jQuery) in a modern stack (AngularJS, Grunt, Bower), improving maintainability and reducing the time spent on tech debt by 20% to 30%.- Increased front-end test coverage by up to 80%, producing 100+ unit tests (Karma and Jasmine), reducing manual testing, and saving time to production by up to 30%.- Refactored the front-end codebase of the product, enabling native integration with the company’s e-commerce systems, making the product accessible to thousands of retailers on the platform.

- Initiated and led a transition of a legacy codebase (jQuery) into a modern stack (AngularJS, Grunt, Bower), that caused an increase in sprint velocity by 20% to 30%.- Ramped up in weeks in a fast-moving Scrum-powered agile environment, delivering tens of front-end related user stories with little to no supervision, helping the team of mostly backend developers to launch the product on time.