Artem – Typescript, React, AI-assisted coding

Web checkout and payment platform supporting ride bookings, food delivery orders, and membership subscriptions.

• Built core web payment flows for a major third-party integration (Instacart), unlocking $62M in quarterly Gross Bookings;
• Led the PCI DSS v4 redesign of web bank-card forms, keeping $1B+ in annual web transactions compliant and uninterrupted;
• Fixed web 3DS authentication, cutting targeted auth errors 80% and recovering shoppers;
• Shipped a customer-facing Membership Transaction History, reducing chargeback and contact rates;
• Drove the migration of multiple lines of business onto the unified checkout platform and retired legacy payment services;
• Overhauled alerting across web payment systems, cutting alert noise 98% and weekly errors from about 3M to 25K;
• Served as incident commander during critical outages;
• Mentored a new teammate and interviewed engineering candidates.

Global subscription-based sports streaming platform offering live and on-demand content to millions of subscribers, with account management, billing, and customer support features.

• Built and owned My Account, a subscriber self-service hub supporting plan changes, payment-method updates, subscription pauses, and localization;
• Developed the Node.js backend-for-frontend and UI for the Help Center, integrating a third-party AI chatbot to support customer self-service;
• Delivered subscription cancellation flows under tight deadlines to meet EU consumer-protection requirements;
• Developed and maintained shared internal libraries and inner-source projects used by other engineering teams;
• Collaborated with Product Managers and Designers to deliver subscriber account management, help center, and chatbot features;
• Supported Data Analysts in rolling out a new Google Analytics data model;
• Contributed to engineering knowledge sharing through Frontend Guild presentations and internal technical blog posts.

Real-time visual analytics platform for processing and exploring large-scale datasets.

• Improved Canvas rendering performance and fixed label-rendering issues during real-time data streaming in the platform’s fork of Apache ECharts;
• Built a custom chart development CLI, enabling customers to create chart templates and integrate visualization libraries such as Chart.js;
• Developed tutorials and technical documentation to support adoption of the chart development CLI;
• Ported the platform’s client SDK to Node.js, extending its compatibility beyond browser environments;
• Contributed to the platform’s gradual migration from Backbone.js to React and TypeScript;
• Developed and maintained web application features, interactive charts, and data visualizations.

Hotel booking platform for an online travel agency offering flights, train tickets, and package holidays alongside accommodation.

• Developed and maintained the backend for a hotel booking application;
• Implemented caching for high-traffic application paths to maintain performance as traffic increased.