Oleksandr P.

Full-Stack Developer & DevOps Engineer | IoT • AI/LLM • Industrial Automation 8+ years of software development experience — from web applications and REST/WebSocket APIs to integration with industrial equipment, IoT devices, and LLM systems. I work across the full lifecycle: architecture and database design, full-stack development, containerization, monitoring, and production support. FULL-STACK DEVELOPMENT Client and server-side development: TypeScript, Vue.js, Node.js, Express.js. Designing and integrating internal and external APIs (REST, Swagger/OpenAPI). Working with PostgreSQL, MySQL, MongoDB, Redis, and ORMs (Sequelize, TypeORM). Maintaining legacy projects on PHP Symfony. DEVOPS & INFRASTRUCTURE Containerizing services (Docker, Docker Compose), building CI/CD pipelines, administering Linux servers (Debian, CentOS) — configuration, optimization, security. Designing messaging systems on RabbitMQ, configuring interaction between services and external systems. MONITORING & DATA ANALYTICS Collecting, transmitting, and visualizing metrics: Grafana, InfluxDB, Elasticsearch, Kibana. Building real-time dashboards for industrial and IT monitoring. IoT & INDUSTRIAL AUTOMATION 9+ years working with embedded systems: STM32, Arduino, ESP, AVR, Raspberry Pi, Siemens PLC. Configuring radio communication and optimizing power consumption for LoRaWAN devices. Implementing I2C, UART, SPI, RS232/485, Modbus, S7, TCP, MQTT, GPIO, UDP protocols for data acquisition systems. Building desktop applications with Electron.js for equipment control, portable solutions on ESP/Raspberry, and solutions on the Balena platform. AI / LLM SYSTEMS Developing RAG systems with Qdrant, Ollama, and vLLM (local inference). Prototyping AI agents in OpenWebUI, building flows in Langflow, prompt engineering. Designed and implemented a Dagster-based orchestration pipeline for automated image recognition: OCR + LLM (Claude API) to extract and structure data from scanned documents. Integrating Anthropic Claude API and OpenAI API into production services. TECH STACK Frontend: TypeScript, Vue.js, HTML5, CSS, jQuery Backend: Node.js, Express.js, Node-RED, C, Python Databases: PostgreSQL, MySQL, MongoDB, Redis DevOps: Docker, Docker Compose, CI/CD, Linux (Debian/CentOS), Bash IoT/Hardware: LoRaWAN, STM32, Arduino, Raspberry Pi, ESP, Siemens PLC, AVR, OCR Monitoring: Grafana, InfluxDB, Elasticsearch, Kibana Protocols: I2C, UART, SPI, RS232/485, Modbus, S7, TCP, MQTT, GPIO, UDP Tools: Git, GitLab, Bitbucket, Jira, Confluence, Electron.js, RabbitMQ, Swagger AI/LLM: Ollama, vLLM, Qdrant, RAG, OpenWebUI, Langflow, Anthropic Claude API, OpenAI API, prompt engineering, Dagster Languages: Ukrainian (native), English (B1+), Russian (fluent) Open to projects in full-stack development, DevOps, IoT hardware integration, and building AI/LLM solutions — from MVP to production support.