Senior Python Software Engineer (generalist back-end and AI)

Engineering / Full-time

Cloud IB is a fast-growing startup aiming to revolutionize the investment banking industry by providing digital analytics tools to investment banks, consulting firms, investors and corporate clients around the world. We are based in Zurich, Switzerland, and Belgrade, Serbia, and are looking to expand our team.

Cloud IB is looking for a Senior Python software engineer to join our team based in Belgrade. The role involves taking ownership of core technical engineering tasks, ability to provide high quality code for prototyping and production in a fast-paced environment and help design architecture and drive output deliveries. This is a hands-on role with real impact and direct collaboration with the CEO and CTO who have extensive experience at tier 1 investment banks in the U.S. and Europe. The role provides an environment to fast forward a career in data analytics in finance and an opportunity to develop as the company expands.

RESPONSIBILITIES

• Design and implement backend features end-to-end, incl. APIs, services, data processing & extraction pipelines
• Build and ship backend features end-to-end (APIs, services, data and scraping pipelines)
• Design reliable systems considering performance, scalability, observability, security
• Implement AI/LLM features (tool/function calling, RAG, evals, prompting, orchestration)
• Contribute with your ideas and initiatives as part of our agile environment
• Continuously improve our technology stack and work processes, incl. code reviews and team development

REQUIREMENTS

• Degree in science, engineering, economics, or mathematics
• At least two years of relevant professional work experience
• Knowledge of major Python libraries and frameworks such as Flask, FastAPI, pandas, SQLAlchemy
• Strong analytical mindset with a pragmatic approach, exercising sound judgment in determining when high levels of refinement are required and when efficiency-driven trade-offs are appropriate
• Experience with DevOps, CI/CD (Github Actions, Jenkins), version control systems (GitHub), and Docker
• Strong capacity for rapidly acquiring new concepts, high levels of self-motivation, excellent communication skills, and the ability to operate responsibly within a dynamic, international environment
• Nice to have: Experience using AI-assisted coding tools, experience with AI frameworks (e.g., LangGraph, DSPy, LlamaIndex, or similar) and data pipelines (such as Airflow, Dagster, or Prefect)

WHAT WE OFFER

• Senior-level compensation
• Opportunity to contribute from day one and professional progression in a high-growth startup
• Work directly with and learn from the company founders with extensive prior experience at financial data startups and tier 1 investment banks globally
• Team events and gym membership
• Downtown Belgrade office location