AI/ML Developer

Yonder Media Mobile Inc.; Warszawa; Remote; PLN 211,000 - 297,000; Full time

Job summary

A global startup in mobile connectivity is seeking an experienced AI/ML Developer specializing in Large Language Models (LLMs). In this role, you will design and implement intelligent personal assistant systems, optimizing LLM workflows and integrating user data. Ideal candidates will have a strong grasp of LLM architecture, proven experience with recommendation systems, and fluency in multiple languages. This position offers flexible working hours, competitive salary, and opportunities for professional growth.

Benefits

Flexible working hours

Competitive salary

Opportunity for personal growth

Qualifications

• Deep understanding of LLM architecture and prompt engineering.
• Experience designing behavioral-driven recommendation systems.
• Familiarity with modern development environments and cloud infrastructure.

Responsibilities

• Design and implement personal assistant scenarios powered by LLMs.
• Develop personalized recommendation systems that adapt to user behavior.
• Optimize and fine-tune LLM workflows and applications.

Skills

Proven experience with LLMs

Understanding of LLM architecture

Designing behavioral-driven recommendation systems

Strong grasp of vector databases

Experience integrating APIs

Familiarity with modern development environments

Excellent analytical skills

Proficient in English

Tools

OpenAI API

Pinecone

Weaviate

FAISS

Job description

About us: YonderMedia Mobile is a global startup creating innovative mobile apps that blend entertainment and connectivity. Our flagship app, Global YO, is an eSIM mobile network+, providing affordable, reliable connectivity in over 200 destinations worldwide. Our mission is to keep people connected 24/7/365, even in areas with low bandwidth, empowering travelers with the freedom to stay online anytime, anywhere. By harnessing cutting-edge technology and a robust network, Global YO is revolutionizing global travel with seamless connectivity options for everyone.

With a global team spread across United States, Mexico, Ukraine, Belarus, Poland, and Spain we foster a collaborative culture that values growth, self-advocacy, and meaningful contributions.

We are looking for an experienced AI/ML Developer specialized in Large Language Models (LLMs) to design, implement, and optimize intelligent personal assistant system.

You will work on building complex multi-step interaction flows, personalized recommendation engines, and contextual memory systems — integrating LLM-driven agents with real-world tools and user data.

This role combines hands-on system design, model orchestration, and applied research in adaptive, human-centered AI.

Key Responsibilities:

• Designing and implementing personal assistant scenarios powered by LLMs (task planning, scheduling, communication handling, summarization, etc.).
• Developing personalized recommendation systems that adapt to user behavior, preferences, and past interactions.
• Optimizing and fine-tuning LLM workflows (prompt engineering, embeddings, R&D pipelines, vector search).
• Developing and maintaining AI-driven applications and integrations across multiple tools and platforms.
• Working with OpenAI, Anthropic, or similar APIs, and exploring new LLM frameworks (LangChain, Semantic Kernel, CrewAI, etc.).
• Conducting ongoing R&D in AI assistant technologies — personalization, memory retention, adaptive reasoning, and safety.
• Collaborating with product and engineering teams to define, prototype, and evolve intelligent assistant capabilities.

Requirements:

• Proven experience working with LLMs (e.g., GPT-4, Claude, Llama, Mistral).
• Deep understanding of LLM architecture, prompt engineering, and context-aware personalization.
• Experience designing behavioral-driven recommendation systems or adaptive AI responses based on user data.
• Strong grasp of vector databases (Pinecone, Weaviate, FAISS) and retrieval-augmented generation (R&D).
• Experience integrating APIs, automations, and user-facing tools in scalable architectures.
• Familiarity with modern development environments, version control, and cloud infrastructure.
• Product-focused mindset with the ability to balance innovation, privacy, and usability.
• Excellent analytical, problem-solving, and communication skills.
• Native level of Ukrainian, Belarusian, Russian; proficient in English.

Preferred:

• Background in Natural Language Processing (NLP), user modeling, or Human-Computer Interaction (HCI).
• Previous work on AI-powered personal assistants or recommendation engines.

Location: Europe (preferably Ukraine, Belarus, Poland)

What we offer:

• Top-notch products disrupting the world of traditional media-services industry;
• Work with brilliant software team with a high level of collaboration and desire to achieve goals;
• Flexible working hours;
• Competitive salary;
• The possibility of personal and professional growth.