Vitalij

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VITALIJ LUKACHYK @Vitalij_Luka
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Full-Stack Engineer Ukraine, Ternopil

ABOUT ME Ukraine, Ternopil
Senior Software Engineer with 8+ years of experience building and scaling high-load distributed systems,
microservices, and real-time platforms. Specialized in Go, Node.js/NestJS, and PHP/Laravel, with strong
expertise in payment systems, KYC/AML compliance, event-driven architectures, CQRS, and Clean
Architecture. Strong full-stack experience with Nuxt 3 / Vue 3, including SSR applications and complex CRM
and e-commerce platforms. Experienced in defense-tech UAV systems, including secure remote operations
with WireGuard and MAVLink, low-latency video, and computer-vision-based guidance using Go and Python.
Strong focus on reliability, security, concurrency, and production-ready architecture, with experience across
iGaming, fintech, e-commerce, and defense-tech products.

SKILL WORK EXPERIENCE

Backend Engineer MAR 2026– JUL 2026
JavaScript / jQuery / ES6+
NDA (iGaming)

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) / fiber plus Tranzzo/TurboGate lifecycles and circuit breakers for resilient
third-party processing.
Python / Django / PySide6 Integrated game providers into the game-service - a Hub88
supplier-promo flow (round reopen, bet/win status mapping) and
Computer Vision (YOLO /
a Slotegrator aggregator adapter.
OpenCV)
Built bonus, loyalty and gamification backends - a multi-step,
deposit-driven Welcome Banner (entity, CRUD, public API), loyalty
MAVLink / ArduPilot
tiers with claimable sub-level rewards, and real-time
WireGuard / Linux Networking quests/missions with per-player state over
WebSocket.
GStreamer / SRT video Built social-auth and compliance backends - Google OAuth (web
+ mobile) with account linking; an AML sanctions-screening
PostgreSQL / MySQL microservice from scratch (Fastify - gRPC backfill, async queues,
multi-tier fuzzy matching); and a KYC funnel-tracing pipeline
RabbitMQ / Redis (KYCaid webhook/iframe, decline-reason capture).
Optimized throughput by offloading heavy work to async
Microservices / Event-Driven
workers/queues, secured files on AWS S3 (pre-signed URLs), and
CQRS + Clean Architectur shipped via GitLab CI/CD (Docker/Kaniko, Sentry/Grafana).

Docker / GitLab(-Hub) CI / CD Backend Engineer JAN 2026– MAR 2026
NDA (iGaming)
Payment & KYC / AML Developed and maintained backend features for a Telegram-
integrations based gaming platform on the TON blockchain, using TypeScript,
Hono, and Bun on Cloudflare Workers with PostgreSQL and Drizzle
Webpack / Gulp / Vite / Nitro ORM.
Built an automated commission payout system: TON wallet
Styling & UI Frameworks
transactions, a Cloudflare Queue consumer, scheduled cron
processing, and an admin configuration UI, fixing a wallet address
generation bug in the payout flow.

LANGUAGE WORK EXPERIENCE
Improved TON withdrawal reliability by reworking error handling
English - B1 / B2 with distinct failure states and covering transaction utilities with
unit tests (Vitest).
Ukrainian - C2 Implemented an admin notification broadcast feature with a rich-
text editor and interactive button types (Vue 3), serving images
Russian - B2
from Cloudflare R2 via an assets proxy and delivering messages to
Telegram users through queues.
Extended core game mechanics (reward calculations, entity
lifecycle, fake-account detection) through schema changes and
EDUCATION versioned PostgreSQL migrations.
Configured Cloudflare Workers infrastructure for delivered features
CHORTKIV COLLEGE OF - cron triggers, queue consumers, R2 storage, secrets
ECONOMICS, LAW AND management - and maintained GitHub Actions deploy pipelines.
INFORMATION TECHNOLOGY
TNEU ON A SPECIALTY
Software Engineer NOV 2025 – PRESENT
ACCOUNTANT
NDA (Defense Tech / UAV)
Chortkiv College of Economics TNEU
Secure remote-access platform for UAV fleet operations over
Sept 2014 - Jun 2017
public internet/LTE: kernel WireGuard VPN with a Go control plane
(chi, PostgreSQL, Redis), one-shot device enrollment tokens,
FACULTY OF COMPUTER Ed25519 JWT auth, RBAC, and a Vue 3 admin SPA embedded into a
INFORMATION TECHNOLOGIES
single Go binary.
(FIT) TNEU ON A SPECIALTY
Least-privilege network policy via netlink/nftables (distroless
SOFTWARE ENGINEER
container, CAP_NET_ADMIN only), periodic kernel-state
(FIT) TNEU
reconciliation, Redis-backed sessions, fail-closed rate limiting, and
Sept 2016 - Jun 2020 a browser SSH console (WebSocket - SSH PTY) into fleet devices.
Cross-compiled Go agents for onboard ARM computers, with link
MANAGEMENT - TERNOPIL watchdogs detecting LTE/NAT64 data stalls and forcing WireGuard
FACULTY OF ECONOMICS AND re-handshakes.
MANAGEMENT TNEU ON A Low-latency RC control over the internet: custom binary protocols,
ECONOMICS AND MANAGEMENT hand-written MAVLink v2 (RC_CHANNELS_OVERRIDE, X.25 CRC),
(FEU) TNEU SBUS/CRSF conversions, 200 ms failsafe, 433 MHz LoRa emergency
Sept 2018 - Jun 2020 backup link; PySide6 operator console.
Onboard Go retranslator bridging the Skyline LRS ground-control
module (telemetry, SBUS, MAVLink API) to the VPN tunnel with
MANAGEMENT - TERNOPIL
multiplexed binary framing and auto-reconnect.
FACULTY OF ECONOMICS AND
MANAGEMENT TNEU ON A H.264 video path drone → relay → operator on GStreamer
ECONOMICS AND MANAGEMENT (RTP/UDP, SRT, hardware encoders) with a keepalive-based UDP
(FEU) TNEU
fan-out relay that solves NAT traversal without signaling.
Visual targeting & autonomous guidance (click-to-follow / click-
Sept 2020 - Jun 2023
to-steer): YOLO detectors trained on custom + VisDrone datasets
(Label Studio, Roboflow, Colab), ByteTrack/CSRT tracking, pixel-to-
FACULTY OF COMPUTER
ground projection from camera intrinsics + MAVLink attitude, PID
INFORMATION TECHNOLOGIES
guidance commanding ArduPilot in GUIDED mode.
(FIT) TNEU ON A SPECIALTY
SOFTWARE ENGINEER Sim-first workflow on Gazebo + ArduPilot SITL with safety interlocks:
engage gating, geofence, commandvwatchdog, lost-target
(FIT) TNEU
HOLD/RTL.
Sept 2023 - Jun 2025

Frontend / Full-Stack Engineer DEC 2023 – JAN 2026
SkyUp
Developed and maintained production web applications using
Nuxt 3 / Vue 3 (SSR/SPA), delivering major user-facing features and
reusable frontend components.
Designed and independently developed a CRM platform based on
Strapi, including content architecture, Content Types, Relations,
Components, Dynamic Zones, Permissions and custom business
logic.
Extended Strapi beyond its standard CMS capabilities by
developing custom backend modules, controllers and server-side
functionality, adapting the platform to specific product
requirements.
Worked on the Strapi v4 → v5 migration, adapting the existing
content model, custom functionality and frontend integration to
the new platform version.

WORK EXPERIENCE

Built a dynamic Nuxt 3 component-driven architecture integrated
with Strapi, where the appropriate UI components were selected
and rendered based on the configured template and content type.
Integrated Nuxt applications with PHP/Laravel backend services,
working with internal APIs and backend functionality, as well as
developing email mailing flows and maintaining email templates.
Translated design specifications into pixel-perfect, accessible
interfaces, maintaining consistent UX across browsers and devices.
Improved frontend performance, rendering efficiency and
application responsiveness through optimization, refactoring and
architectural improvements.
Participated in code reviews, established frontend best practices
and contributed to long-term maintainability of the codebase.
Collaborated with product managers, designers and backend
engineers to define API contracts, integrate services and deliver
features reliably.

Full-Stack / Back-End Engineer 2022 – Nov 2023
CRM-Market & multi-tenant e-commerce SaaS Continued part-time on demand

Architected a microservices backend in Node.js/NestJS + Go with
PostgreSQL, Redis, and RabbitMQ: core CRM API, notification,
delivery, marketplace-integration, fiscal, and media services
communicating over gRPC and message queues, with TypeORM
versioned migrations and idempotent, DLQ-backed consumers.
Built the storefront platform: 26 Nuxt 3 SSR templates deployed as
isolated Docker containers behind a subdomain-routing gateway,
with per-tenant token resolution, guest checkout, delivery selection,
and online payment.
Implemented a Strapi-like template customization engine: staff
define JSON section schemas (text, images, repeaters, colors),
tenants fill auto-generated dynamic forms in the admin panel, and
storefronts render the values server-side with brand fallbacks and
CSS-variable theming.
Developed the payments and subscription domain: LiqPay
integration with webhook-driven activation, plan feature-matrix
enforcement on every paid action, template purchases with
prorated upgrades, trial/manual (cash) activation flows with full
transaction logging, and a platform-wide payment kill-switch with
staff alerting.
Integrated the Prom.ua marketplace through a dedicated Go
service (gRPC): product export with localization, order polling with
data-loss-safe mirroring, status/TTN/payment sync, and
catalog/customer/order-history import.
Built an omnichannel seller inbox: website contact forms, Prom
messages, per-seller Telegram bots, and SMS campaigns (SMS
Club) unified into one conversation model with a Customer 360
view.
Shipped a fiscalization (PRRO) service in Go: qualified digital
signatures (DSTU 4145), receipt XML signing and gRPC exchange
with the tax authority, offline mode, and automated cash-
register/cashier registration.
Added an AI module with a provider-agnostic port/adapter design
(Claude / OpenAI-compatible): product translations, content
optimization, and hybrid competitor price analysis (search API +
LLM) with per-plan credit limits.
Integrated delivery carriers (Nova Poshta, Ukrposhta, Meest):
city/warehouse lookups, TTN creation, and label printing, with
encrypted per-tenant credentials.
Hardened security across the platform: TOTP 2FA, closed IDOR/auth
gaps found via self-audit, server-side subscription validation,
secrets rotation, AES-encrypted credential storage, and store
publishing gated on tenant approval.

WORK EXPERIENCE

Own the infrastructure and delivery pipeline: 30+ GitHub Actions
CI/CD pipelines to GHCR with zero-downtime container redeploys,
nginx wildcard-subdomain routing with SSL, Redis read-through
analytics caching with cron pre-warming, automated encrypted
PostgreSQL/media backups to offsite object storage (Cloudflare
R2), and self-hosted product analytics (Umami), monitoring via
Grafana.

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