Senior Python Software Engineer (LLM)

Net2Phone is seeking a Senior Python Engineer with deep backend expertise and practical experience integrating AI into production systems. You’ll join our agile R&D team working on greenfield initiatives that harness LLMs, cloud infrastructure, and data-driven systems to build powerful new tools for real-world use.

Important note:
This role is not focused on building or fine-tuning custom AI/ML models. We are looking for engineers with strong backend and cloud skills who can integrate and operationalize LLMs from top providers into scalable products.

At IDT you will:

• Architect and develop full-stack applications powered by LLMs and modern backend services.
• Integrate large language models into production systems through APIs and prompt engineering.
• Design and manage scalable cloud infrastructure (AWS, GCP, or Azure).
• Build and optimize data storage and querying for large, complex datasets.
• Rapidly prototype and iterate on MVPs and product concepts.
• Collaborate in a small, innovative R&D team with full autonomy and high impact.

We expect you to have:

• Expert-level Python development experience in backend-heavy environments.
• Strong experience using LLMs via APIs and prompt engineering (e.g., OpenAI, Anthropic).
• Deep understanding of cloud architecture, distributed systems, and deployment best practices.
• Proven skills in database design, optimization, and handling large datasets.
• Startup or R&D mindset: independent, curious, fast-moving, and pragmatic.
• Excellent communication skills and fluent English (B2+ or higher).
• Nice to have: Full-stack capability with experience in React or modern frontend frameworks.

We are pleased to offer:

• Remote work as b2b contractor or hybrid full-time in Belarus and Moldova.
• Really good hardware.
• An exciting and challenging job with talented people around.
• Great learning and growth opportunities.
• Compensation for professional training, seminars, and conferences.
• First-class English lessons.
• More perks for the Minsk and Chisinau office full-time employees.

Why Join Us?

Work on truly greenfield AI-powered products with a small, elite team.
Have real ownership and autonomy from day one.
Focus on applied AI — solving practical problems with real-world impact.
Operate in a startup-like environment within a stable, global company (IDT.net).

A few words about us:
IDT Corporation is a global communications company founded in 1990 and headquartered in Newark, New Jersey. We are industry leaders in prepaid communication and payment services and one of the largest international voice carriers. We are listed on the NYSE, employ over 1800 people across 20 countries, and have over $1.5 billion in revenues.

We are not ”another big IT corporation”— we encourage and support in-house entrepreneurs in developing their ideas into business actions.

Net2Phone is a rapidly growing global provider of unified cloud communications solutions. It solves the problem of cost optimization for businesses in more than 50 countries, providing them with high-quality VoIP services. Net2Phone provides businesses with an integrated communications suite featuring powerful collaboration tools such as voice, messaging, chat, and unlimited domestic and international calling to 23+ countries.
The product was named ‘VoIP Supplier of the Year’ by the Telecom Consulting Group in 2018.