Нікіта

Nikita Zushchyk Backend Engineer
CONTACT Phone: [відкрити контакти](див. вище в блоці «контактна інформація») Github: https://github.com/NikitaZushchyk
Telegram: @Qwerty_1228 Location: Ukraine
Email: [відкрити контакти](див. вище в блоці «контактна інформація») Linkedin: [відкрити контакти](див. вище в блоці «контактна інформація»)

SUMMARY Backend Engineer with 4+ years of experience building scalable and reliable
web applications. I specialize in backend architecture, migrating legacy
monoliths to modern microservices, and optimizing high-load systems. My
core expertise lies in PHP, working extensively with relational databases, and
using NoSQL databases for specific tasks. I focus on asynchronous
processing via message brokers, implementing high-performance search and
caching layers, and delivering cloud-ready applications. Passionate about
clean architecture, database optimization, and building maintainable backend
infrastructure.
Core Skills
PHP 8+, Laravel, SQL (MySQL/PostgreSQL), REST API, SOLID, Redis,
Elasticsearch, ClickHouse, RabbitMQ, Docker, Git.

WORK Backend Engineer | Mobilunity (Outstaff at Nova Digital) Oct 2024 – Jan 2026
EXPERIENCE
Worked as a backend developer on an internal enterprise-level asset
management system, handling API integrations for warehouse hardware and
management dashboards.
Tech stack: PHP, Laravel, MySQL, Redis, Kafka, Elasticsearch, ClickHouse,
Microservice architecture.

Achievements
Extracted certain domains from a legacy monolith into standalone Laravel
microservices and developed new scalable features, enabling the system to
reliably process over 50 million daily transactions.
Developed an event-driven inventory tracking service using Kafka for
asynchronous communication. Synchronized read data with Elasticsearch,
eliminating MySQL deadlocks and reducing query response times to under
30ms.
Engineered a high-throughput API for warehouse scanners (500+ RPS).
Decoupled synchronous MySQL inserts by utilizing Redis as an in-memory
queue, implementing background workers for bulk database updates. This
reduced database I/O operations and eliminated lock contentions.
Maintained high system reliability and code quality by covering core business
logic, background jobs, and RESTful API endpoints with comprehensive Unit
and Feature tests using PHPUnit.
Optimized long-running background processes by resolving critical memory
leaks (optimizing Eloquent models to Query Builder and managing garbage
collection) and improved overall API resilience using NoSQL caching
strategies.
Middle PHP Developer | Adducates Jul 2023 – Aug 2024
Worked as a full-stack developer on an internal ERP system designed to
aggregate and analyze e-commerce data for management.
Tech stack: PHP 8, CodeIgniter, PostgreSQL, Redis, jQuery, Amazon API.
Achievements
Maintained and refactored a legacy monolithic application built on CodeIgniter,
progressively improving code quality, readability, and system stability.
Integrated and synchronized large volumes of data using the Amazon SP-API
and the Amazon Ads-API, ensuring accurate real-time updates of inventory,
sales metrics, and advertising campaign performance.
Worked extensively with a highly distributed PostgreSQL architecture involving
6 database shards and time-based table partitioning. Optimized complex SQL
queries to run efficiently across partitioned data.

Junior PHP Developer | WebFox Dec 2021 – Jun 2023
Worked as part of the backend team on the development and support of a large-
scale B2B platform for e-commerce
Tech stack: PHP 8, Laravel, MySQL, Redis, Elasticsearch, PHPUnit, REST API.
Achievements
Designed and maintained RESTful APIs for a platform using PHP and Laravel,
focusing on clean code and reliable architecture.
Architected an automated parcel tracking system by integrating the Nova
Poshta API. Configured scheduled Cron tasks to batch-check delivery statuses
and utilized background queues (Jobs) to asynchronously dispatch SMS
notifications via TurboSMS.
Implemented an advanced fuzzy search functionality for the platform's product
catalog, significantly improving product discoverability and user experience.