Yevhen – Typescript, PHP, React

Led the technical architecture and delivery of multiple enterprise e-commerce and backend-intensive web platforms. The projects focused on scalable system design, cloud infrastructure, CI/CD automation, engineering best practices, complex third-party integrations, and performance optimization while supporting high-traffic business applications.

• Led technical strategy, architecture, infrastructure, CI/CD, and engineering standards for a 28-person engineering organization serving international clients across Ukraine, the EU, the US, Canada, Australia, and the Middle East;
• Delivered 50+ Magento projects across e-commerce, marketplace, and SaaS domains, covering custom modules, backend functionality, performance optimization, and third-party integrations;
• Led architecture and delivery for large-scale commerce platforms, including a Magento-based project with 1M products, 300+ categories, 80K recurring customers, and approximately $50K in daily sales;
• Owned technical discovery, risk analysis, estimation, and solution design for international client projects;
• Built and evolved production CI/CD pipelines using Docker Compose, Jenkins, GitHub Actions, and Linux-based infrastructure;
• Designed caching and performance strategies using Redis and Varnish for production Magento platforms;
• Led a broader modernization, optimization, and refactoring effort on a production Magento platform, cutting time-to-first-byte from ~30s to ~200ms and reducing hosting costs from ~$10,000 to ~$2,500 per month;
• Established engineering workflows across teams, including Jira/Kanban processes, code review practices, technical interviewing, onboarding, mentoring, and engineering standards.

Crypto payment processing platform with off-chain virtual wallets, transaction workflows, and event-driven backend architecture, including a supporting web frontend, mobile client, and analytics data pipeline.

• Designed and built a fintech MVP for crypto payments and custody operations as the sole technical owner on a long-running part-time project;
• Built backend services in TypeScript and NestJS using Temporal-based workflow orchestration;
• Applied Domain-Driven Design, Hexagonal Architecture, and event-driven design to separate business logic, workflows, integrations, and infrastructure concerns;
• Implemented off-chain virtual wallets with idempotent, append-only transaction records;
• Built asynchronous processing and messaging flows using NATS, Kafka, and BullMQ;
• Built the complete web frontend in React and Next.js and integrated it with the platform's backend services;
• Designed the data layer around PostgreSQL, MongoDB, and ClickHouse;
• Deployed the platform on Kubernetes with GitHub Actions CI/CD;
• Built a mobile client from scratch using Kotlin Multiplatform.

Multi-store, multi-language e-commerce platform built from scratch for 4 stores and 2 languages, supporting 130K products, 50K users, and approximately 2.5K orders per month, encompassing backend services, storefront, workflow orchestration, and observability.

• Served as the sole technical owner of a production-grade headless e-commerce platform, driving its architecture and end-to-end delivery;
• Developed backend services in TypeScript and NestJS using microservices, Domain-Driven Design (DDD), and event-driven architecture;
• Created the customer-facing storefront with React and Next.js, integrating it seamlessly with headless backend services. Architected asynchronous messaging and processing pipelines using NATS and BullMQ;
• Orchestrated complex order workflows, initially leveraging Saga and Transactional Outbox patterns before migrating to Temporal-based workflow orchestration;
• Established observability capabilities with OpenTelemetry and ClickHouse to improve monitoring and system diagnostics;
• Automated deployment and delivery pipelines using Docker Compose and GitHub Actions, streamlining the CI/CD process.

Magento 2 e-commerce platform for a nationwide retail network of 2.5K stores, supporting 200K products and 10K recurring users, covering custom storefront theming, backend functionality, a companion mobile application, ERP synchronization, and push-notification integration.

• Delivered a production Magento 2 e-commerce platform and supporting mobile application as the sole developer;
• Implemented custom Magento 2 backend functionality, modules, and storefront theming based on Figma designs;
• Built a supporting backend service in TypeScript, Node.js, and NestJS for Firebase integration and mobile application communication;
• Built a mobile application in Flutter from scratch;
• Implemented full 1C ERP integration covering catalog synchronization, user data, and checkout flow;
• Integrated Firebase for push notifications, real-time updates, and analytics.

Magento-based e-commerce product delivery for a Swedish agency and its Northern European clients, covering custom development, CI/CD, and performance optimization for a dedicated development team.

• Led an 11-person dedicated team serving a Swedish agency and its Northern European e-commerce clients;
• Delivered approximately 30 small Magento 1 projects, template-based commerce implementations with custom modules, themes, and third-party integrations;
• Introduced Docker-based project setup and deployment workflows using Docker Compose and Jenkins;
• Reduced new project deployment to a single-command process by standardizing Docker Compose environments and Jenkins-based delivery pipelines;
• Built an internal project-templating system that allowed new Magento projects to be scaffolded from templates with preconfigured modules and interfaces.

Magento 1 e-commerce store development for US clients as part of a large engineering team, covering custom modules, themes, payment and shipping integrations, and store optimization.

• Contributed to 5 Magento 1 e-commerce projects as part of a 20+ engineer team, covering module development, themes, integrations, and store optimization
• Participated in code reviews and collaborated with other engineers to maintain delivery quality

Magento 1, Drupal, WordPress, and custom web development for international clients, progressing from hands-on development into leading a small development team, including Varnish and 1C ERP integrations.

• Built and maintained websites on Magento 1, Drupal, WordPress, and custom-built stacks, including modules, themes, storefront functionality, and third-party integrations for international clients
• Progressed into a Team Lead role, leading a 5-person development team across Magento 1, Drupal, WordPress, and custom projects, covering planning, estimation, code review, and mentoring
• Implemented Varnish caching for high-traffic e-commerce projects