Сергей

Sergey Levchenko
[open contact info](look above in the "contact info" section)
fullstack developer

Full-stack developer with 15+ years of experience building scalable
web and mobile applications.
Strong focus on backend architecture, microservices, high-load
systems and clean code.
Experienced in PHP (Laravel, Symfony), Python (FastAPI, Django), Go,
Node.js and modern frontend (Vue, React).

Skills

Backend: PHP (Laravel, Symfony, Yii), Python (FastAPI, Django), Go, Node.js
Databases: MySQL, PostgreSQL, MongoDB, Redis
Messaging: RabbitMQ, Ka ka
Search: Elasticsearch
DevOps: Docker, Kubernetes (basics), CI/CD, AWS
Frontend: Vue.js (4 yrs), React (2 yrs), Angular (2 yrs)
Mobile: Swift, Objective-C
Other: Microservices architecture, system design, performance optimization

English: B2

Work experience

Arbostar (2023 – 2026)
Senior Full-stack Developer

• Developed and scaled CRM platform for the tree-care industry serving multiple clients.
• Designed and implemented microservices architecture using Laravel, FastAPI, Redis and
RabbitMQ.
• Improved system performance and reliability by optimizing database queries and introducing
Elasticsearch.
• Participated in migration to Kubernetes and AWS infrastructure.

Laravel, MySQL, Python, FastAPI, Redis, RabbitMQ, ElasticSearch, Kubernetes, AWS, microservices
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RVA FinTech Solutions (2021 – 2023)

Built and adding new features to intech products, adding features, integrating services, and
focusing on code quality and releases.

Django, Laravel, MySQL, Python, React, RabbitMQ, ElasticSearch, Kubernetes, AWS

Unipost (2020 – 2021)
Fullstack Developer

• Built CRM ful illment platform from scratch (warehouse management + delivery integrations).
• Designed microservices architecture and reliable inter-service communication (RabbitMQ).
• Optimized heavy MySQL queries and improved overall system performance.
• Integrated Nova Poshta and other delivery services.

Stack: Symfony 5, Vue, Redis, RabbitMQ, Doctrine, Docker, Golang.

Investors Observer (2018 – 2020)

Implemented features and maintained Symfony/Angular applications using microservices. Focused
on backend scalability, database optimization (Postgres, MongoDB), search functionality, and
containerization.

Stack: Symfony, Angular, Redis, ElasticSearch, MongoDB, Docker, Postgrees

Higher Media (2012 – 2018)

Developed CRM and SaaS applications for landing pages and educational sites. Handled backend
architecture, integrations, and performance optimization.

Stack: CodeIgniter, Zend, WordPress, Drupal, Redis, Node.js, Python

W3Ukraine (2008 – 2012)

Built PHP-based websites, capturing requirements, ensuring compliance, and collaborating with
teams.

Stack: jQuery, WordPress, Drupal, CakePHP.
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Projects

1) CANAL+ iOS app

Description:
iOS/IPad application for watching CANAL+ tv channels and subscription functionality

Role:
Database, front-end and back-end architecture planning and implementation. iPad version
development.