Vitalij

[відкрити контакти](див. вище в блоці «контактна інформація»)

VITALIJ LUKACHYK [відкрити контакти](див. вище в блоці «контактна інформація»)
Ukraine, Ternopil
Full-Stack Engineer

ABOUT ME

Senior Backend Engineer with 8+ years of experience building and scaling high-load web platforms.
Specialized in distributed microservices - payments, KYC/AML compliance, and event-driven backends -
across PHP/Laravel and Node.js/NestJS, with CQRS + Clean Architecture at the core. Strong focus on reliability,
security, and correctness under concurrency, with solid full-stack reach into Nuxt 3 / Vue 3 when a feature
needs it. Proven delivery across multiple products (iGaming, fintech, enterprise) in fast-paced environments.

SKILL WORK EXPERIENCE

Backend Engineer MAR 2026– JUL 2026
JavaScript / jQuery / ES6+
2K

TypeScript Owned backend across a high-load, distributed microservices
iGaming platform (10+ services in PHP/Laravel and Node.js/NestJS);
Vue.js (2/3) + Vuex/Pinia designed service boundaries and data flow with Clean Architecture
+CQRS and event-driven messaging over RabbitMQ, gRPC, Redis,
Nuxt.js (2/3/4) and PostgreSQL (Doctrine/TypeORM).
Engineered race-safe money paths (deposits, payouts, bet/win
React + Redux
rounds) — idempotent handlers, refund-retry queues, timeout-safe
Node.js / Nest.js / Fastify.js processing, and round-reopen recovery - eliminating double-
credit and lost-update defects under concurrency.
PHP / Laravel Integrated payment providers at the API level - Asquad deposits
and H2H card payouts (transaction logging, provider callbacks),
Go (Golang) plus Tranzzo/TurboGate lifecycles and circuit breakers for resilient
third-party processing.
PostgreSQL / MySQL Integrated game providers into the game-service - a Hub88
supplier-promo flow (round reopen, bet/win status mapping) and
RabbitMQ / Redis a Slotegrator aggregator adapter.
Built bonus, loyalty and gamification backends - a multi-step,
Microservices / Event-Driven
deposit-driven Welcome Banner (entity, CRUD, public API), loyalty
tiers with claimable sub-level rewards, and real-time
CQRS + Clean Architectur
quests/missions with per-player state over WebSocket.
Docker / GitLab(-Hub) CI/CD Built social-auth and compliance backends - Google OAuth (web +
mobile) with account linking; an AML sanctions-screening
Payment & KYC/AML microservice from scratch (Fastify - gRPC backfill, async queues,
integrations multi-tier fuzzy matching); and a KYC funnel-tracing pipeline
(KYCaid webhook/iframe, decline-reason capture).
Webpack / Gulp / Vite Optimized throughput by offloading heavy work to async
workers/queues, secured files on AWS S3 (pre-signed URLs), and
Styling & UI Frameworks shipped via GitLab CI/CD (Docker/Kaniko, Sentry/Grafana).

Backend Engineer JAN 2026– MAR 2026
Fight4TON
LANGUAGE Developed and maintained backend features for a Telegram-
based gaming platform on the TON blockchain, using TypeScript,
Hono, and Bun on Cloudflare Workers with PostgreSQL and Drizzle
English - B1
ORM.
Ukrainian - C2 Built an automated commission payout system: TON wallet
transactions, a Cloudflare Queue consumer, scheduled cron
Russian - B2 processing, and an admin configuration UI, fixing a wallet address
generation bug in the payout flow.
EDUCATION WORK EXPERIENCE

CHORTKIV COLLEGE OF Improved TON withdrawal reliability by reworking error handling
ECONOMICS, LAW AND with distinct failure states and covering transaction utilities with
INFORMATION TECHNOLOGY unit tests (Vitest).
TNEU ON A SPECIALTY
Implemented an admin notification broadcast feature with a rich-
ACCOUNTANT
text editor and interactive button types (Vue 3), serving images
Chortkiv College of Economics TNEU from Cloudflare R2 via an assets proxy and delivering messages to
Sept 2014 - Jun 2017 Telegram users through queues.
Extended core game mechanics (reward calculations, entity
FACULTY OF COMPUTER lifecycle, fake-account detection) through schema changes and
INFORMATION TECHNOLOGIES versioned PostgreSQL migrations.
(FIT) TNEU ON A SPECIALTY Configured Cloudflare Workers infrastructure for delivered features
SOFTWARE ENGINEER - cron triggers, queue consumers, R2 storage, secrets
(FIT) TNEU management - and maintained GitHub Actions deploy pipelines.
Sept 2016 - Jun 2020
Frontend Engineer DEC 2023 – JAN 2026
MANAGEMENT - TERNOPIL SkyUp
FACULTY OF ECONOMICS AND Delivered and maintained major user-facing features using Nuxt 3
MANAGEMENT TNEU ON A
/ Vue 3 (SSR/SPA) within complex, production-scale web systems.
ECONOMICS AND MANAGEMENT
Integrated Nuxt 3 / Vue 3 applications with PHP-based backend
(FEU) TNEU systems, ensuring seamless data exchange and stable runtime
Sept 2018 - Jun 2020 behavior.
Translated design specifications into pixel-perfect, accessible UI,
MANAGEMENT - TERNOPIL maintaining high UX quality across devices and browsers.
FACULTY OF ECONOMICS AND Improved frontend performance, rendering efficiency, and overall
MANAGEMENT TNEU ON A application responsiveness through optimization and refactoring.
ECONOMICS AND MANAGEMENT Led code reviews and promoted best practices to maintain code
(FEU) TNEU quality and long-term maintainability.
Sept 2020 - Jun 2023 Collaborated closely with product managers and designers to
deliver features reliably and on schedule.
FACULTY OF COMPUTER
INFORMATION TECHNOLOGIES
(FIT) TNEU ON A SPECIALTY Full-Stack / Back-End Engineer 2022 – Nov 2023
SOFTWARE ENGINEER CRM-Market & E-commerce Projects
(FIT) TNEU Designed and developed full-stack web applications using Vue.js /
Sept 2023 - Jun 2025 Nuxt.js, Node.js (NestJS, Express), and PostgreSQL, supporting both
internal CRM systems and e-commerce platforms.
Architected and implemented RESTful APIs for frontend
applications and third-party service integrations, ensuring clean
contracts and scalable data flow.
Built a real-time user notification system, significantly improving
user engagement and responsiveness of the platform.
Designed server-side architecture, including modules, controllers,
routing, and middleware, following best practices in maintainability
and scalability.
Led database design and optimization, creating efficient schemas,
modeling complex relationships, and working with PostgreSQL and
MySQL.
Defined and configured database indexes to improve query
performance and overall system efficiency.
Ensured application security and reliability by implementing
authentication, access control, data encryption, and protection
against common vulnerabilities.
Collaborated closely with frontend developers and stakeholders,
supporting feature delivery, version control workflows, and cross-
team communication.
WORK EXPERIENCE

Frontend Engineer JUL 2022 – FEB 2023
Proxima Research
Developed a secure, interactive web application using Vue.js,
delivering a responsive and intuitive user interface.
Implemented real-time features using WebSocket connections,
enabling live data updates and improving user interaction.
Built and extended Vue-based components, maintaining existing
functionality and ensuring application stability in production.
Collaborated with project managers and stakeholders to plan
feature delivery, prioritize tasks, and optimize development
resources.
Improved UI consistency, usability, and performance across
multiple releases.

Frontend Engineer Dec 2021 - Feb 2022
HappyUsers
Collaborated with the 3D development team to integrate
interactive 3D solutions into a production web application.
Implemented frontend logic to seamlessly combine 3D
components with core product functionality, maintaining
performance and a smooth user experience.
Delivered new user-facing features in alignment with product
requirements and technical constraints.
Built and integrated photo editing functionality, extending user
interaction flows and application capabilities.
Ensured UI consistency, stability, and reliability while working with
complex, media-rich features.

Full-Stack Engineer (Frontend-Focused) Mar 2020 - Jul 2022
PrivatBank
Designed and evolved frontend architecture that improved
application scalability, performance, and maintainability in a
large-scale enterprise environment.
Developed secure, interactive web applications using modern
frontend frameworks, delivering intuitive and reliable user
interfaces.
Integrated frontend applications with Go-based backend services,
ensuring efficient and secure data exchange.
Implemented asynchronous communication using AJAX and JSON,
enabling seamless interaction between frontend and backend
systems.
Collaborated with backend engineers to align API contracts, data
models, and performance requirements.

Information Technology Teacher 2018 - 2020
IT STEP
Systems Administrator 2018 - 2020
IT STEP
Full-Stack Engineer 2017 - 2020
Freelance
Member at Aiesec 2016 - 2017