Senior ML Engineer, AI Solutions (Greek-speaking)

About the Position

At Sword, we’re building AI to heal billions and unlock humanity’s full potential. In doing so, we’re pioneering AI Care, a fundamentally new approach to healthcare built for medical reasoning, safety, and real-time treatment, not generic technology applied after the fact. As both a clinical-centric frontier AI lab and an applied AI platform, Sword is reimagining how care is delivered at scale, removing traditional barriers like appointments, waiting rooms, and stigma so more people can access the care they need-and ultimately get back to lives lived in full.

Since 2020, Sword has expanded across physical therapy, women’s health, cardiometabolic, and mental health, and is now moving beyond the session to a fully AI-native, 24/7 care program that brings physical activity, therapeutic exercise, psychotherapy, nutrition, and behavior change into one connected experience. More than 700,000 members across three continents have completed over 10 million AI sessions, helping 1,000+ enterprise clients avoid more than $1 billion in unnecessary healthcare costs. Backed by 42 clinical studies, 44+ patents, and more than $500 million raised from leading investors including Khosla Ventures, General Catalyst, and Founders Fund, Sword is defining a new standard for healthcare.

Responsibilities

• Own the design, delivery, and improvement of our AI agents and other LLM-powered products;
• Integrate new models into the platform and build the benchmarks to evaluate them;
• Own agent real-time observability;
• Ship the production backend behind the agents as well as the supporting platform;
• Bring your intuition about LLM architecture and how it shapes agent architecture;
• Grow the AI function by defining the practices, raising the bar in review, and mentoring.

Requirements

• 4+ years building and running production software;
• Working understanding of how LLMs are architected and behave;
• Solid experience in SQL, Python, and event-driven design;
• Experience shipping LLM-powered features and their observability;
• Experience designing evals;
• Experience with Cloud platforms (ideally GCP);
• Experience leading and owning complex and ambiguous projects from ideation to completion/maintenance;
• Experience providing technical oversight and mentoring colleagues;
• Ability to communicate fluently and confidently in Greek and English, at a proficient level.

Nice to Have

• Experience with voice agents, telephony, STTs, TTSs, and latency budgets;
• Experience in healthcare or another regulated domain;
• Experience designing experiments and reading their results correctly;
• Experience serving several clients from one codebase.

We Offer

• Competitive salary: €53.900 - €84.700 EUR
• Country-specific benefits may vary and will be detailed separately.

About the Company

Sword Health complies with applicable Federal and State civil rights laws and does not discriminate on the basis of Age, Ancestry, Color, Citizenship, Gender, Gender expression, Gender identity, Gender information, Marital status, Medical condition, National origin, Physical or mental disability, Pregnancy, Race, Religion, Caste, Sexual orientation, and Veteran status.