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Valentyn Yemets
Looking for a jobPython/Go Developer
Backend engineer at Stock42 who improved LLM answer accuracy from 72% to 91% with a LangGraph agent and RAG evaluation pipeline.
ArgentinaPython/Go Developer at Stock42
Experience
Python/Go Developer
Built REST and gRPC microservices in Go following Clean Architecture and SOLID. Implemented order, user, notification, and payment modules with goroutines and worker pools, and connected services via Kafka. Developed a LangGraph agent for customer support and RAG retrieval with OpenAI embeddings and vector search, improving answer accuracy and reducing hallucination rate.
GoGinEchoProtobufKafkaClean ArchitectureSOLIDLangGraphRAGOpenAIOpenSearchPineconePgvectorGCPBigQuerySnowflakeStreamlitSentry
Python Developer
Built REST APIs with Django REST Framework and async microservices with FastAPI and asyncio. Implemented background jobs with Celery and Redis, optimized PostgreSQL/MySQL queries, and shipped services in Docker via GitLab CI/CD. Developed an LLM chat moderation system for a dating app using a Gemma-based classifier.
PythonDjango REST FrameworkfastAPIAsyncIOCeleryRedisPostgreSQLMySQLPytestDockerGitLab CI CDGemmaLLM
Education
Dnipro National University
Studied Mathematics at Dnipro National University.