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From: Belarus

Location: Domaszczyn, PL

On Useme since 7 November 2026

About me

I help companies develop and improve backend systems using Java and Kotlin. I design Spring Boot services, API integrations, and event-driven workflows with Kafka and RabbitMQ. I analyze application and database performance, improve monitoring, and automate repetitive processes, including with AI.

I have Staff/Lead-level and architecture experience. I work with MySQL, MongoDB, Cassandra, ClickHouse, Grafana, Prometheus, and CI/CD.

I offer integrations, focused audits, and proofs of concept with a clearly agreed scope and acceptance criteria. I am open to small projects and ongoing collaboration for 10–20 hours per week.

Languages: Polish B1, English A2.

Categories

Web development > Website development
Coding and IT > Software
Coding and IT > Web apps
Coding and IT > IT projects

Skills

API Backend GraphQL Java Kotlin MongoDB Mysql React Redis REST Spring Framework

Portfolio

AI Integration & Workflow Automation

AI-powered automation and integration of LLMs into business workflows. Experience with OpenAI, Claude, AI agents, MCP, and API integrations. Focus on process automation, developer productivity, and intelligent solutions.

API Development & System Integration

Development of REST APIs and integrations using Java, Kotlin, and Spring Boot. Experience with Kafka, RabbitMQ, external services, and asynchronous processing. Focus on reliable communication, security, and scalable solutions.

Backend Development & Microservices Architecture

Design and development of scalable backend systems using Java, Kotlin, Spring Boot, Kafka, and SQL/NoSQL databases. Expertise in REST APIs, microservices, system integrations, performance optimization, and reliable data processing.

Database & Performance Optimization

Database optimization and performance tuning for high-load applications. Experience with MySQL, PostgreSQL, MongoDB, Cassandra, and ClickHouse. Expertise in query optimization, monitoring, troubleshooting, and system reliability.