Senior AI Engineer (Horizons product)

Job Description

Is there a limit to growth? Not at Hostinger.

We’re constantly reaching new heights. With a team of 900 professionals, we are behind the success of over 4 million clients in 150 countries, helping them launch their e-shops, blogs, portfolios, businesses, and passion projects.

Our mission: To build world-class solutions for anyone to easily succeed online

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.

Curious to learn more? Connect with your team: Tomas Rasymas, Head of AI

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).

Benefits that fuel your growth

🚀 360 Growth: We provide limitless learning opportunities: access to platforms like Reforge and CoachHub, global conferences, physical and digital libraries, feedback culture, and mentoring through TesoXchange. Advance your career with internal mobility and grow with a team eager to share knowledge and support your success.

🎯 Freedom & responsibility: Work on your terms: from modern offices in Kaunas and Vilnius, the comfort of home, or anywhere in the world. Enjoy flexibility in managing your schedule and bring your ideas to life in a fast-paced, dynamic environment.

💪 Wellness simplified: Your health comes first with insurance from Day 1, gym memberships, recharge leave, and regular health checks. Join sports, arts, and hobby clubs, or simply enjoy the balance of a lifestyle that prioritizes wellness.

🎉 Work hard - party hard: Recognize hard work with company events like Summerfest & Winterfest, Town Hall, Meet the Client initiatives, team-building, and workations. Enjoy access to the Žalgiris Arena VIP Lounge and celebrate life’s big moments with milestone gifts for weddings, new parenthood, and graduations.