Oleksii Posohov
Oleksii Posohov

Backend Developer / Full-Stack Developer with AI & LLM Integration

Actively looking · Member since 6 Oct 2026
Location
Kyiv, Ukraine
Desired salary
Unspecified
Work preference
Remote Only
Experience level
Mid

About

Professional summary

I am a Backend and Full-Stack Developer with more than four years of commercial experience building, maintaining, and optimizing web platforms. My primary expertise is in PHP backend development, while I also work across frontend development, infrastructure, APIs, databases, and automation.

I have experience with high-traffic media products and large e-commerce marketplaces. I develop scalable backend functionality, integrate external services, optimize SQL queries and application performance, and contribute to new product development from initial implementation through production support.

I specialize in AI and LLM integrations for production systems. My work includes OpenAI, Claude, and Gemini API integrations, prompt engineering, RAG pipelines, vector embeddings, semantic search, recommendation systems, AI-powered translation, classification, content generation, and automated video scripting.

I have designed and implemented multi-service MCP (Model Context Protocol) architectures for design automation, content workflows, and media analytics. I am comfortable working with vector databases and applying embeddings-based similarity search to personalized recommendation and search use cases.

My technical background includes PHP, Java, JavaScript, TypeScript, Python, Go, Node.js, SQL, MySQL, REST APIs, Nginx, Linux, Docker, and Git. I also have practical frontend experience with HTML, CSS, responsive layouts, and Figma-based implementation.

I work effectively in English-speaking distributed teams and have experience with feature delivery, third-party API integrations, code review, architecture discussions, debugging, and continuous improvement of existing systems.

Skills

31 capabilities

Tech stack & tools

Working toolkit

Application Hosting

Data Stores

Design

Languages & Frameworks

Experience

Career history

PHP / Full-Stack Developer Large Media Holding

I maintain and develop a high-traffic news website built with PHP and Zend Framework. My work includes feature development, bug fixes, UX improvements, AMP page optimization, and building new internal websites for the holding.

I designed and built a news recommendation system using article vector representations, embeddings-based similarity search, a vector database, and user behavior data. I also developed an automated video creation service with AI-generated news scripts, media asset selection, and rendering workflows, and implemented MCP integrations for design automation, content processes, and AI-powered media analytics.

Full-Stack PHP Developer Large E-commerce Marketplace

I maintained and developed a large e-commerce marketplace across both backend and frontend. I integrated supplier and marketplace APIs, including Taobao, Alibaba, and 1688, supporting catalog synchronization, order processing, and data transformation.

I implemented AI-powered translation of Chinese product names and descriptions through LLM APIs and developed automated HS customs code generation using AI classification. I also performed deep platform optimization through profiling, caching, SQL query tuning, reduced server response times, and Nginx infrastructure configuration.

Java Backend Developer Dutch Company (NDA)

I developed and maintained backend systems for marketplace platforms as part of a distributed team. My work included implementing new backend features and integrating third-party APIs using Java and REST APIs.

I worked in a fully English-speaking environment, participating in daily communication, code reviews, task discussions, and architecture planning. I contributed to the planning of new modules and improvement of existing backend solutions.

Education

Learning history
No education data available.

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