Senior Backend Engineer (Python)

TL;DR

Senior Backend Engineer (Python): Designing and building backend services in Python (FastMCP, FastAPI) with an accent on implementing MCP tool and agent-ready workflows. Focus on integrating with LLM services, developing RAG pipelines, and ensuring stability and cost-efficient inference.

Location: Poland; Portugal; Serbia; Spain

Company

hirify.global is a global software company offering an ecosystem of products and services that serve as a growth engine for top mobile-first businesses worldwide.

What you will do

• Design and build backend services in Python (FastMCP, FastAPI).
• Implement MCP tool and agent-ready workflows (tool schemas, orchestration).
• Build async pipelines using asyncio (concurrent I/O, task orchestration, background jobs).
• Integrate with LLM services: prompt engineering, structured output parsing, token/cost management.
• Develop RAG pipelines: embeddings, vector search, retrieval strategies, chunking.
• Design experiments, track quality metrics, turn R&D findings into production features.

Requirements

• 5+ years Python backend experience.
• Strong async web framework experience (FastAPI or similar).
• Deep understanding of asyncio: gather, semaphores, task groups, error propagation.
• PostgreSQL and advanced SQL (complex joins, window functions, query optimization).
• R&D mindset: running benchmarks, and iterating quickly on prototypes.
• Experience with Docker, Kubernetes, AWS infrastructure.

Nice to have

• Experience building RAG systems: embeddings, vector databases, retrieval and ranking.
• Familiarity with MCP protocol, LangChain, or agentic workflows.
• Experience with prompt optimization and evaluation (prompt versioning, A/B testing, quality metrics).
• Marketing technology background (Apple Search Ads, ASO).
• Experience with StarRocks (or other OLAP databases, e.g. ClickHouse).

Culture & Benefits

• Vacation and public holidays following your country's regulations, with additional PTOs annually.
• Medical insurance or health care compensation and paid sick leave.
• Access to top online/offline conferences and internal courses for professional development.
• Micro-management-free and supportive management style with semi-annual performance reviews.
• Flexible working schedule and a remote-first working environment.
• Coworking costs coverage program and office hubs in key locations.