Full-Stack AI Engineer | Agentic Systems

Volodymyr R

Information

Available hours \ week
40 h/w
Seniority level
Senior
Years of experience
7 yrs.
Location
Ukraine, Lviv
Nationality
Ukraine
Timezone
(GMT+02:00) Kyiv

Languages

English
Advanced (C1)

About

As a full-stack AI engineer with more than 7 years of experience, Volodymyr focuses on agentic LLM applications and end-to-end automation. He builds product-grade services using JavaScript, Node.js, TypeScript, Python, Nest.js, Express.js, and Django, balancing speed with maintainability. He designs multi-agent workflows using RAG patterns, tool orchestration, and guarded execution, including scoped permissions, allowlists, fail-closed paths, and human-review checkpoints. His typical work includes real-time features over WebSockets, structured function calling, and usage instrumentation to track tokens, latency, and cost for reliability. Across AWS, GCP, and Azure, he ships through CI/CD using Docker, Kubernetes, serverless, and microservices where appropriate. His data layers commonly involve PostgreSQL, MongoDB, MySQL, and Redis. He also supports GraphQL, Jest, and React Native when needed. His domain experience includes healthcare, e-commerce, real estate, management, and AI.

Experience

AI-Native Low-Code Platform & CRM System

AI Engineer / Software Architect

About the Project

AI-native low-code platform enabling businesses to build customized applications, connect intelligent agents, and automate operational workflows through an integrated CRM and visual workflow builder.

  • AI
  • Management

Responsibilities

– Architected and developed frontend and backend components for a modular AI-native application platform; – Designed a multi-agent architecture in which specialized agents handle retrieval, validation, notifications, and workflow operations; – Integrated OpenAI, LangChain, and Pinecone to support LLM-powered workflows and contextual information retrieval; – Implemented interactive React/Next.js interfaces and visual workflow-building functionality. – Integrated CRM-related workflows and external business APIs; – Developed Python/FastAPI services supporting isolated agent actions and structured tool responses; – Implemented MCP tool interfaces with scoped permissions, validated inputs, and explicit restrictions on unauthorized data modification; – Built fail-closed agent execution paths and human-review checkpoints for sensitive operations; – Instrumented OpenAI and Anthropic model usage, measuring per-action tokens, latency, and execution costs.

The Baby Project

Software Architect / Full-Stack Developer

About the Project

Healthcare-oriented application helping parents monitor child development, including sleep, nutrition, medication, vaccinations, growth, and developmental milestones.

  • Healthcare

Responsibilities

– Collaborated with stakeholders to define product requirements, user journeys, and health-tracking workflows; – Developed React interfaces for structured health information entry and visualization; – Contributed Node.js backend functionality and PostgreSQL-connected data workflows; – Worked on real-time synchronization and integration between frontend and backend services; – Supported application documentation, testing, and technical delivery; – Implemented auditable access controls and least-privilege permissions for sensitive health information; – Added human-review checkpoints before publishing AI-derived health insights; – Applied HIPAA-aligned logging and privacy engineering practices.

Data-intensive SaaS Platform

Full-Stack Developer

About the Project

Multi-facility administrative platform supporting animal medical information, clinical and behavioral records, operational management, historical data, and reporting.

  • Healthcare
  • Management

Responsibilities

– Developed data-heavy application functionality across Python backend services and React-based interfaces; – Worked with structured medical and operational records, reporting workflows, and relational data; – Used PostgreSQL for application data management; – Worked with Celery and Redis for background processing and asynchronous application functionality; – Contributed to application testing and development workflows using Pytest; – Implemented read-scoped FastAPI endpoints for controlled medical-record retrieval; – Introduced auditable access paths and restrictions on unauthorized data modification.

Web Automation AI Agent

AI Engineer / Software Architect

About the Project

AI-powered web automation platform using language models, connected tools, browser interactions, and background processing to execute operational tasks.

  • AI
  • Management

Responsibilities

– Contributed to Python and Node.js architecture for an AI-powered automation platform; – Integrated OpenAI models and LangChain tools into automation workflows; – Implemented browser interactions and automated processing using Puppeteer; – Worked with Redis and BullMQ for background task processing; – Developed React/Next.js interfaces and real-time application functionality; – Implemented structured function calling, tool allowlists, isolated execution errors, and fallback handling; – Built automated regression checks for failed tool execution and unexpected agent output.

Voice Assistant Application

Full-Stack Developer / Team Lead

About the Project

Voice-enabled commerce application allowing users to interact with an assistant and place orders through conversational experiences.

  • E-commerce

Responsibilities

– Contributed to frontend and backend application architecture. – Developed React and Next.js application interfaces and business functionality. – Worked with conversational integrations and voice-assistant functionality. – Built and maintained backend services using Python and Node.js technologies. – Supported AWS Lambda deployment and automated delivery processes. – Participated in technical leadership, implementation planning, and code reviews. – Implemented transcript-processing workflows with structured intent extraction and fallback handling for ambiguous speech inputs.

ERP System for Homebuilding

Full-Stack Developer

About the Project

Enterprise platform providing project management, operational dashboards, customer workflows, document processing, and AI-assisted business functionality.

  • Real Estate

Responsibilities

– Audited the existing codebase and identified opportunities for architecture modernization; – Refactored application components to improve maintainability and scalability; – Implemented dashboards with advanced filtering and project tracking; – Integrated AI-assisted functionality into operational workflows; – Contributed to role-based document and business processes; – Built approval-gated document workflows with restrictions on unauthorized final writes.