Особисті дані приховані

Oleksii Kashtanov
Python Full-stack Developer (FastAPI, React)
Ukraine (Remote) | [відкрити контакти](див. вище в блоці «контактна інформація»)

PROFESSIONAL SUMMARY

Backend developer using PHP / Python / Node.js with experience working on e-commerce platforms in
an enterprise environment. Building and supporting scalable application ecosystems.
Full-Stack / Software Engineer experience specializing in high-performance cloud systems, microservices
architecture, and team leadership. Skilled in monolith-to-microservices migration, database optimization
under high loads, and integrating modern AI capabilities (Anthropic Claude Certified, LLM). I am looking
for a position where I can apply my engineering expertise to solve complex technical challenges,
optimize system performance, and contribute to production-ready AI and cloud solutions within a
collaborative development team.

TECHNICAL SKILLS

● Backend & Languages: PHP (Laravel, Symfony, Yii), Python (FastAPI, Django, Flask), Node.js
(Express, Nest.js), Java (Spring Boot).
● Frontend: JavaScript, React, Vue.js, TypeScript, jQuery, HTML5/CSS3.
● Databases & Message Brokers: SQL (PostgreSQL, MySQL, MS SQL Server), NoSQL(Redis,
MongoDB), RabbitMQ.
● Methodology: Microservices, OOP, SOLID, DDD, Design Patterns, REST API.
● DevOps: AWS, Docker, Apache, Bash, Linux/Ubuntu, Git/GitHub/Bitbucket.
● AI: LLM Integration, Prompt Engineering, Anthropic Claude Certified, Gemini, ChatGPT, Copilot,
Google Antigravity IDE, Cursor.

EXPERIENCE
WellnessLiving (Product company) - Senior PHP & Python Developer/ Full Stack Engineer
May 2022 – 2026
● Architect and maintain a sophisticated cloud-based CRM system.
● Implement scalable backend logic to support high-concurrency user environments.
● Leading the transition of monolithic components to a microservices architecture. Mentor junior and
mid-level developers, conducting code reviews to ensure adherence to best practices.
● Using tools AI (LLM) in developing complex codebases. Deep analysis and refinement of
AI-generated code: code review, optimization, debugging, and testing, CI/CD, release, and software quality.

Absolutist (Gamedev) - Web Developer
May 2020 – April 2022
● Developed and supported internal and external web projects for a leading game development studio.
● Streamlined project delivery pipelines, improving cross-departmental collaboration.

Babenko Ecommerce GMBH - PHP Developer
May 2019 – April 2020
● Engineered high-performance online e-commerce stores with a focus on user experience and
checkout optimization.
● Integrated third-party APIs and payment gateways to expand platform functionality.

Lotos (Construction & CRM) - Full Stack Developer
September 2016 – April 2019
● Led the development of a custom website and CRM system tailored for a construction enterprise.
● Optimized data workflows between front-end interfaces and back-end database structures.

Computer Academy STEP - PHP Developer
December 2014 – August 2016
● Managed and supported 30 internal high-load projects, ensuring 99.9% uptime.
● Designed complex database schemas to handle massive educational datasets.

Ukrassist - Web Developer|
December 2012 – November 2014
● Functioned as a Full Stack Developer while managing critical system administration tasks.
● Modernized legacy systems to improve security and operational efficiency.

EDUCATION
National Mining University - B.Sc. in Computer Science ( Engineer-programmer )
2007 - 2012 | Specialty: Information Technology

CERTIFICATIONS
Anthropic Academy (2026) — AWS, API integration, MCP, Claude Code:
● Claude with Amazon Bedrock | Verify Certificate
● Building with the Claude API | Verify Certificate
● Model Context Protocol Advanced Techniques | Verify Certificate
● Claude Code in Action | Verify Certificate
Java & Spring Boot Ecosystem — Wellnessliving Professional Development (2024)
● Focus: Hibernate, Liquibase, Spring Security, Docker, and Testcontainers
Microservices Architecture 101 — Wellnessliving Professional Development (2024)
● Focus: Monolith-to-Microservices migration, Communication protocols, and Observability

LANGUAGES
● English: B1 ( Intermediate )
● Ukrainian / Russian: Native