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MIHAIL LEYBUK-GALIN
TECH LEAD / SENIOR FULL-STACK ENGINEER
React | Next.js | Vue | TypeScript | Go | Node.js | Distributed Systems

Ukraine (Remote) | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)

PROFESSIONAL SUMMARY
Tech Lead and Senior Full-Stack Engineer with 10+ years of experience building production e-commerce, SaaS,
and VoIP platforms. Combines hands-on engineering with technical leadership across React, Next.js, Vue,
TypeScript, Go, Node.js, microservices, and event-driven systems. Owns delivery from product requirements and
system design through implementation, deployment, and production support.
10+ YEARS OF ENGINEERING | PRODUCTION E-COMMERCE | END-TO-END TECHNICAL OWNERSHIP

PROFESSIONAL EXPERIENCE
Knigoland 2025 - Present
Tech Lead / Senior Full-Stack Engineer
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Own the technical direction and hands-on development of a production e-commerce platform spanning the customer
storefront, backend services, Directus CMS, and integration pipelines for a catalog of 40,000+ products.
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Architect and optimize the storefront with Next.js App Router, React, TypeScript, Tailwind CSS, and next-intl, covering
SSR, SEO, localization, PWA behavior, image delivery, caching, prefetching, and client payload performance.
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Build Go services and APIs with Fiber, gRPC, GORM, and PostgreSQL for catalog, product, category, promotion, order,
review, loyalty, and cashback domains.
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Design asynchronous data processing with Kafka and distributed caching with Redis Cluster; integrate Oracle ERP, CRM
systems, Directus, and internal services while keeping external failures isolated from core workflows.
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Improve production reliability through timeouts, background jobs, idempotent upserts, failure-resistant service boundaries,
and hands-on troubleshooting of CORS, memory, queue, cache, network, and deployment incidents.
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Define engineering conventions, review architecture and code, mentor developers, plan delivery, and coordinate frontend,
backend, and infrastructure decisions.
Technology: Next.js, React, TypeScript, Tailwind CSS, next-intl, Go, Fiber, gRPC, GORM, PostgreSQL, Redis Cluster, Kafka, Directus,
Oracle ERP, REST, Docker, Nginx, Cloudflare, Portainer, Hetzner Cloud, PWA, SEO
OneVOIPlanet Sep 2022 - Dec 2024
Tech Lead / Full-Stack Developer
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Led frontend and full-stack delivery across Vue.js and React applications, translating product requirements into scalable
architecture and reusable components.
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Integrated browser-based IP telephony with WebRTC and SIP in the Asterisk and Kamailio ecosystem, connecting
real-time calling workflows with web applications.
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Established code review, CI/CD, and delivery practices; improved performance through SSR, dynamic imports, caching,
and bundle optimization.
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Mentored developers and guided implementation decisions across frontend, backend, integrations, and production
delivery.
Technology: Vue.js, React, TypeScript, JavaScript, Node.js, NestJS, Redis, PostgreSQL, WebRTC, SIP, Asterisk, Kamailio, Docker,
CI/CD

[open contact info](look above in the "contact info" section) | Page 1

MIHAIL LEYBUK-GALIN TECH LEAD / SENIOR FULL-STACK ENGINEER

PROFESSIONAL EXPERIENCE - CONTINUED
Teamwork Commerce Apr 2015 - Oct 2021
Senior JavaScript Developer | Clearwater, FL
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Designed and developed scalable frontend architecture for commerce applications using Vue.js, React, and modern
JavaScript.
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Modernized legacy applications through an incremental migration from Knockout.js to Vue.js while preserving business
continuity.
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Built reusable UI components and maintainable state-management solutions with Vuex and Redux for complex retail
workflows.
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Improved performance through lazy loading, tree-shaking, and bundle optimization; developed automated tests with Jest
and Cypress.
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Applied accessibility practices aligned with WCAG and collaborated with product and backend teams to deliver stable
customer-facing functionality.
Technology: Vue.js, React, JavaScript ES6+, TypeScript, Knockout.js, Vuex, Redux, Jest, Cypress, Webpack, REST APIs, WCAG

TECHNICAL EXPERTISE

Leadership & Architecture Frontend
Technical leadership, system design, microservices, React, Next.js, Vue.js 2/3, Nuxt.js, TypeScript, JavaScript
distributed systems, event-driven architecture, API design, ES6+, Svelte, Tailwind CSS, Redux, Pinia, Vuex
code review, mentoring

Backend & APIs Data & Messaging
Go, Fiber, Node.js, NestJS, REST, gRPC, GORM, Redis Cluster, Kafka, RabbitMQ, caching, asynchronous
PostgreSQL, MySQL processing, background jobs

Infrastructure & Delivery CMS, Quality & Specialized
Docker, Nginx, Cloudflare, Portainer, Hetzner Cloud, CI/CD, Directus, Strapi, Jest, Cypress, SSR, SEO, PWA,
Git, Webpack, Vite performance optimization, WCAG, WebRTC, SIP, Asterisk,
Kamailio

LEADERSHIP & DELIVERY STRENGTHS
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End-to-end product ownership from requirements and architecture through implementation, release, and production
support.
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Pragmatic modernization of legacy systems through incremental migrations and reusable component and API
boundaries.
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Reliability engineering for distributed integrations using asynchronous processing, caching, timeouts, background jobs,
and idempotent updates.
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Performance-focused frontend delivery across SSR, SEO, PWA, asset optimization, code splitting, and responsive user
experiences.
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Team enablement through engineering standards, code reviews, mentoring, delivery planning, and cross-functional
technical communication.

EDUCATION
Specialist in Applied Mathematics and Control Systems Theory 2003 - 2008
Donetsk National University

LANGUAGES
Ukrainian - Fluent | Russian - Fluent | English - Intermediate (technical documentation and written communication)

[open contact info](look above in the "contact info" section) | Page 2