Constantine – AWS, Python, React

The newest product specializing in educational software for children. It is a mobile app targeted for ages 3 to 6, providing a safe and fun environment where children can independently and playfully explore letters, numbers, shapes, and more.

• Collaborated with product owners and stakeholders to design and develop key features.
• Led a cross-functional engineering team of 5 to successfully launch the product.
• Designed and implemented backend architecture and infrastructure.
• Conducted API stress testing to ensure reliability and performance before launch.

A leading online educational platform for children, also available in Germany and Poland. Offers games and quizzes organized by subject and carefully aligned with the official curriculum.

• Delivered complex features and third-party integrations that improved customer satisfaction.
• Modernized the frontend stack, migrating a monolithic codebase from Backbone and jQuery to Vue, and restructured repositories to align with a microservices architecture.
• Contributed to platform scaling during a 67% user growth surge amid COVID-19.
• Optimized CI/CD pipelines using Jenkins, reducing build time by 30% and improving pipeline stability.
• Introduced best practices for code reviews and testing, strengthening technical standards.
• Led a cross-functional distributed team, mentoring engineers on technical decisions and professional growth.

A company organizing art classes with local artists. Events are held in the evenings at bars and cafes, allowing guests to create art and enjoy a fun night out.

• Developed a backend admin panel to manage artists, venues, and events.
• Built an API layer to handle event ticket purchases.
• Wrote unit and integration tests to ensure functionality and reliability.

The second-largest animal park in the Netherlands, located in the northern region of the country.

• Developed a ticketing system used by the ticket office to sell visitor tickets.
• Integrated the system with POS terminals to enable card payments.
• Supported backend functionality related to ticket purchasing workflows.

A language learning platform that helps users master foreign languages by immersing them in authentic video content, including movies, TV shows, and popular vlogs. All videos are carefully reviewed, and extensive vocabulary lists are prepared to support learning.

• Built the server-side of the web application, ensuring performant and secure backend functionality.
• Developed the client-side to enhance user experience.
• Maintained and optimized LAMP servers for performance and scalability.
• Managed the project blog using WordPress CMS.