B2B Project: Senior Python Engineer

B2B Project: Senior Python Backend Developer

Hays IT Contracting is a cooperation based on B2B rules. We connect IT specialists with interesting technological projects on the market. For our client, we are currently looking for a Senior Python Backend Developer to provide services related to scalable backend and microservices solutions.

• Cooperation type: B2B, through Hays Poland
• Rate: 150 - 180 PLN/h
• Cooperation model: hybrid, Cracow

Project Description The project focuses on building scalable, high-performance Python backend solutions in a microservices environment, including APIs, service-to-service communication and data processing.

Technology environment Python, FastAPI, AsyncIO, REST, gRPC, Kafka, PostgreSQL, MongoDB, Redis, Docker, Kubernetes, pytest, CI/CD, Azure / AWS / GCP, Infrastructure as Code

Scope of services

• Design and develop scalable Python backend solutions and microservices.
• Build and integrate high-throughput APIs and data pipelines.
• Make architectural decisions and evaluate technical trade-offs.
• Develop PoCs, test, debug, profile and optimize Python applications.
• Support CI/CD and cloud-based environments.

Required competencies

• Strong Python, FastAPI and AsyncIO expertise.
• Experience with REST, gRPC, Kafka and microservices.
• Knowledge of PostgreSQL, MongoDB and Redis.
• Experience with Docker, Kubernetes, CI/CD and cloud solutions.
• Strong understanding of backend architecture and performance optimization.

Nice to Have Experience with AI / Agentic AI, including LangChain, LangGraph, LlamaIndex, OpenAI, Anthropic, RAG, embeddings, FAISS or Azure AI Search.

The cooperation is carried out between independent businesses (B2B model) and covers the performance of services within the agreed project scope. The Contractor independently organizes and manages the manner in which the services are performed, taking into account the project requirements, security obligations, and the necessary communication with the client. Any information regarding location, availability, or project meetings is provided solely for organizational purposes and shall not be construed as creating an employment relationship, employer-like supervision, or performance of work under the direction or control of the client.

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