Senior Full-Stack Engineer (Python/AI)
Ad Vantedge d.o.o.
Beograd
Beograd: Kolarčeva 5
25.03.2026.
We’re a product-focused team building AI-driven software used in real-world production environments. Our work sits at the intersection of scalable backend systems, modern frontends, and applied AI. We value ownership, pragmatism, and clear communication over hype.
Role Description
We’re looking for a Senior Full-Stack Engineer (Python/AI) to join us on a contract/fractional basis (~20 hrs/week)
You’ll play a hands-on role in designing and building scalable, production-ready systems from APIs and async workflows to AI-powered features. This is a senior role with real ownership, not a task-based contractor position.
What you’ll do
- Design and build backend systems in Python (FastAPI, async patterns)
- Work across the stack, with strong awareness of frontend and product needs
- Develop and ship AI/LLM-powered features into production
- Design APIs, workflows, and background processing systems
- Review code and help maintain high engineering standards
- Collaborate closely with product and other engineers in a remote setup
What we're looking for
Strong experience in:
- Python and backend architecture
- FastAPI and API design
- Async systems, queues, and background workflows
- SaaS and multi-tenant architectures
- Shipping AI / LLM features to production
Plus points for:
- Frontend or product sensibility (you don’t build APIs in a vacuum)
- Strong ownership and judgment — you’re comfortable making trade-offs
- Experience working as a contractor or in fractional roles
- Clear communication and comfort working fully remote
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