Python Engineer (11/932)

INFOLET SP. Z O.O.; Kraków; On-site; PLN 80,000 - 110,000; Full time

Job summary

INFOLET SP. Z O.O. is seeking an experienced backend developer in Kraków, Poland. The role focuses on designing, developing, and maintaining scalable services using Python, with a strong emphasis on AI and integration technologies.

Ideal candidates will have over 6 years of experience in backend development, strong skills in Python and SQL databases, and familiarity with AI orchestration frameworks. Collaboration with product and engineering teams is essential for delivering robust solutions.

Qualifications

• 6+ years of experience developing backend applications in production environments.
• Strong commercial experience with Python.
• Experience with SQL databases.
• Experience designing and building large-scale, distributed systems.
• Hands-on experience integrating LLMs or third-party AI APIs.
• Experience with AI orchestration frameworks.
• Excellent problem-solving skills.
• Strong communication skills and a collaborative mindset.

Responsibilities

• Design, develop, and maintain scalable backend services using Python.
• Take ownership of features throughout the development lifecycle.
• Build robust, high-performance server-side solutions.
• Design and maintain APIs, including AI-powered endpoints.
• Develop and optimize integrations with vector databases.
• Contribute to the design and evolution of the engineering architecture.
• Collaborate closely with product and engineering teams.

Skills

Python

SQL Databases

Problem-solving

Collaboration

AI orchestration frameworks (LangChain, LlamaIndex)

LLMs integration

Backend architecture

Job description

• Design, develop, and maintain scalable backend services using Python.
• Take ownership of features throughout the entire development lifecycle – from architecture and implementation to deployment and maintenance.
• Build robust, high-performance server-side solutions for production environments.
• Design and maintain APIs, including AI-powered endpoints integrating with Large Language Models (LLMs).
• Develop and optimize integrations with vector databases and AI orchestration frameworks.
• Contribute to the design and evolution of the engineering architecture and codebase.
• Collaborate closely with product, engineering, and AI teams to deliver reliable, scalable solutions.

MUST HAVE

• 6+ years of experience developing backend applications in production environments.
• Strong commercial experience with Python.
• Experience working with SQL databases.
• Experience designing and building large-scale, distributed systems.
• Hands‑on experience integrating LLMs or third‑party AI APIs (e.g., OpenAI, Anthropic).
• Experience with AI orchestration frameworks such as LangChain or LlamaIndex.
• Strong understanding of backend architecture and software design principles.
• Excellent problem‑solving skills and the ability to quickly learn new technologies.
• Strong communication skills and a collaborative mindset.

NICE TO HAVE

• Experience with networking infrastructure.
• Experience in cybersecurity.
• Experience working with vector databases.