LLM Engineer (AI)

Location: Europe; fully remote with Work From Anywhere

Annual gross compensation: €75K–€125K, including any applicable target bonus

Company

hirify.global develops AI companionship products used by more than 50 million people, supported by proprietary AI moderation technology and self-hosted, fine-tuned open-weight models.

What you will do

• Fine-tune open-weight LLMs using SFT, LoRA/QLoRA, DPO, and GRPO.
• Diagnose model failures and determine whether to address them through data, post-training, prompting, or classifiers.
• Build training datasets and evaluations that guide subsequent model development.
• Improve personalization, character consistency, tone, multilingual behavior, and group interactions.
• Ship models to production and use real user behavior to guide iterations.
• Accelerate the training loop to make experiments faster, easier to compare, and more reproducible.

Requirements

• Hands-on experience personally post-training open-weight LLMs for a user-facing product and shipping them to production.
• Experience working on a product or business where AI was core, not an experimental side feature.
• Fine-tuning must be a core part of your experience.
• Strong Python, PyTorch, and Hugging Face skills, including hands-on GPU training and debugging.
• Ability to build data and evaluations independently and make evidence-based decisions.
• Ability to take work beyond notebooks into production.
• Daily use of AI tools in engineering work.
• Comfort working with uncensored models and explicit NSFW content, including harmful material, when developing and evaluating moderation systems.

Nice to have

• Experience with conversational AI, roleplay products, or highly personalized consumer AI.
• Experience with multilingual LLMs.
• Experience with moderation, safety, or adversarial testing.
• Experience with multimodal models.
• Open-source LLM or post-training contributions.

Culture & Benefits

• Fully remote work with an international team and an annual in-person gathering.
• Four weeks, or 20 working days, of paid time off per year.
• Preference for B2B contracting, with flexibility for a long-term commitment.
• Monthly health insurance allowance of USD 100 and access to unlimited one-to-one sessions with psychologists and lifestyle experts, including access for up to three family members.
• Budgets for co-working, learning, equipment, and premium AI tools including ChatGPT, Hugging Face, and Claude Code.