Senior Python Engineer – Vector Search / Retrieval Infrastructure

Startup Environment, High Ownership, Demanding ClientsJoin our startup-like environment filled with new ideas, rapid change, and a strong focus on priorities and delivery.We are looking for a Senior Python Engineer — someone experienced, open-minded, and ready to take real ownership of both product and technical direction. You will work closely with demanding clients, solve complex engineering problems, and help build and scale ambitious, high-performance vector search systems.This role is for engineers who enjoy responsibility, fast feedback loops, architectural challenges, and working under pressure.Your primary responsibilities beyond the will to change the world:Design, implement, and optimize vector database solutions (Qdrant, Pinecone, Weaviate, or similar) for production-scale retrieval systems.Build and maintain Python services for embedding generation, indexing, and semantic search pipelines.Tune indexing strategies (HNSW, quantization, sharding) for latency, recall, and cost trade-offs.Integrate vector search with RAG pipelines, LLM applications, or recommendation systems.Collaborate with ML/data teams to optimize embedding models and retrieval quality.Monitor, profile, and improve performance of vector search infrastructure at scale.Requirements:Strong Python skills, including experience with async programming and API design.Hands-on experience with Qdrant, Pinecone, Weaviate, Milvus, or a comparable vector database.Solid understanding of embedding models, similarity search, and ANN algorithms (HNSW, IVF, etc.).Experience with Docker/Kubernetes and cloud deployment (AWS/GCP/Azure).Familiarity with RAG architectures and LLM-based applications is a plus.Comfortable working with large-scale data pipelines and performance optimization.Nice to Have:Experience with other DB technologies (PostgreSQL + pgvector, Redis, Elasticsearch).Background in ML/NLP.Contributions to open-source vector search projects.BenefitsThe list of benefits is long, so we'll mention only the crucial ones:Challenging projects with real business impactWork in a startup-like environment: fast decisions, autonomy, responsibility100% remote or office in Poland (Wrocław / Zielona Góra)Sport subscriptionPrivate healthcare