Oleksandr – Angular, Node.js, Ionic

A core platform for managing subscriptions, shopping cart flows, payments, and event processing across a distributed microservice ecosystem. The platform supports high-volume business-critical operations and integrates multiple internal systems through event-driven communication.

• Developed backend services using Node.js, TypeScript, and microservice-based architecture
• Worked on subscription lifecycle management, shopping cart flows, payments, and event processing
• Built and maintained event-driven integrations between distributed services
• Designed scalable backend solutions for business-critical platform functionality
• Improved reliability through retries, idempotency, validation, and production monitoring
• Participated in architecture discussions, technical design, code reviews, and production support
• Collaborated with backend, frontend, QA, product, and DevOps engineers
• I actively use AI tools and agents in my engineering workflow to improve productivity, automate routine development tasks, and speed up research, debugging, and implementation. My AI experience includes building AI-assisted workflows using LLMs, MCP integrations, and project-specific context. For example, I created workflows where an AI agent can use context from Confluence, Jira, Bitbucket, logs, and production errors to analyze issues, investigate relevant code, suggest fixes, write tests, and prepare pull requests. I also have experience with RAG concepts, prompt engineering, AI agents, and integrating LLM-based tools into development processes. I use AI for code analysis, documentation generation, debugging, test creation, architecture research, and implementation planning.

A health-tech platform focused on early autism assessment and support for children. The project aimed to provide digital tools that help specialists and families run structured child development tasks, collect behavioral data, and support the early identification of autism-related signs.

Key responsibilities:

• Developed backend services, mobile application features, and admin dashboard functionality
• Designed the architecture for backend, mobile, and admin applications
• Built APIs and integrations with AWS, PostgreSQL, and Firebase
• Implemented CI/CD processes
• Created unit and integration tests
• Conducted thorough code reviews
• Delivered robust and scalable solutions
• Ensured high code quality through reviews, testing, and clean architecture practices

A content automation platform for publishers and media companies that personalized story recommendations and delivered them through email, web, and push notification channels.

• Built scalable back-end services using Node.js and microservice-based architecture
• Developed systems for personalized content recommendation and automated story delivery
• Worked on a flexible email template builder used for marketing and editorial campaigns
• Built integrations with email, push notification, and third-party marketing platforms
• Developed reporting and analytics features for campaign performance tracking
• Participated in architecture design, code reviews, and production support
• Led development activities, mentored engineers, and helped maintain high code quality

Website for online shopping that allows adding/editing products in the admin panel.

• Created architecture for the database
• Designed UI components
• Worked on the admin panel

Marketplace for fitness products.

• Designed architecture for Database and UI components
• Implemented integration with payment providers
• Created UI elements/components from design to HTML/CSS

The main idea of the product is to help people to study the Ukrainian language. Now, they are working on the new version of the website and applications (IOS/Android), based on Ionic 5, and are going to migrate to Ionic 6

• Created architecture of the back-end and front-end parts
• Developed UI components based on the design
• Created the applications for Android and IOS with Flutter
• Communicated with product and design teams