Join Hostinger, and we’ll grow fast! We’re shaping the future of online success — powered by AI and driven by people. With 900+ talented professionals and over 4 million clients in 150 countries, we help creators and entrepreneurs bring their ideas to life faster and easier than ever before. Our mission: To provide tools that help individuals and small businesses succeed online faster and easier. Our culture: Guided by 10 company principles. Our formula for success: Customer obsession, innovative products, and talented teams. As a Senior AI Engineer on Hostinger’s Horizons team, you’ll play a key role in shaping the intelligence behind our next-generation product. You’ll research and design solutions to complex, real-world problems, test hypotheses through experimentation, and bring validated ideas into production. In this role, you’ll collaborate closely with Horizons’ frontend and backend engineers, as well as the product team, to build and scale AI systems that power an exceptional user experience. You’ll move fluidly between research, engineering, and product thinking—bridging insights and implementation to deliver measurable impact. Your day-to-day: Explore and preprocess raw, messy datasets; design labeling and data strategies where needed. Prototype model ideas, agentic/inference systems, prompt strategies, fine-tuning, and rigorous evaluations of hypotheses. Translate prototypes into production: build RESTful APIs, containerize applications (Docker), and deploy reliably. Monitor production performance, run ablation studies, and iterate with product, UX, and data teams to improve impact. Identify and investigate key open questions — why are these clusters meaningful, what decisions do they drive? — and craft well-reasoned solutions. Tackle ambiguous problems with curiosity, initiative, and a strong sense of ownership. Collaborate with cross-functional teams (Product, Design, DevOps, and UI) to turn ideas into shipped, impactful features. Your skills and experience: Strong Python programming skills with deep, hands-on experience. 3+ years of experience working on LLM-related or advanced AI model projects (prompting, fine-tuning, or building generative agents). Knowledge of TypeScript, JavaScript, React, and front-end development fundamentals. Proven experience developing robust RESTful APIs and containerizing applications (Docker; Kubernetes is a plus). Solid Linux and DevOps skills, including Git, Jira, CI/CD pipelines, and performance monitoring. Strong analytical mindset — you don’t just build clusters; you interpret their meaning, communicate impact, and connect insights to business outcomes. Ability to independently identify important questions and develop thoughtful, well-reasoned answers. Motivation to solve problems without ready-made solutions and to explore the unknown. Strong data analytics skills — beyond modeling, you interpret results, assess significance, and drive product decisions. Fluency in Lithuanian and English (both written and spoken). Compensation: Gross salary 6,000 to 10,000 EUR/month. Salary is offered based on work experience, competence, and compliance with other job requirements.