Senior Open-Weight LLM Engineer — Fully Remote

EverAI Limited; Barcelona; Remote; EUR 70,000 - 120,000; Full time

Benefits offered by this job

Fully remote work

4 weeks PTO

Annual in-person gathering

Health & Wellness budget

Co-working budget

Learning budget

Company laptop & equipment

Job summary

EverAI Limited is building the future of AI companionship with a fast-growing, globally distributed team. Our LLMs power a consumer-facing platform used by millions, and you will own end-to-end model development from post-training to production.

You will work with Marco and the CTO across data, evals, and model behavior to push personalization, multilingual support, and faster training cycles at scale.

Qualifications

• You’ve personally post-trained open-weight LLMs for a user-facing product and shipped them to production.

Responsibilities

• Fine-tune open-weight LLMs using SFT, LoRA/QLoRA and post-training methods such as DPO and GRPO.
• Diagnose model failures and turn them into experiments. Decide whether the answer is better data, post-training, prompting or classifiers.
• Build training data and evals that directly shape what gets trained next.
• Improve model behavior across personalization, consistency, tone, multilingual and group interactions.
• Ship to production and use real user behavior to guide the next iteration.
• Speed up the training loop so experiments are faster, easier to compare, and more reproducible.

Skills

Post-trained LLMs

Python

PyTorch

Hugging Face

Data & evals

AI tools daily

Uncensored content handling

Tools

LoRA

QLoRA

SFT

DPO

GRPO

GPU training

Job description

EverAI Limited is building the future of AI companionship with a fast-growing, globally distributed team. Our LLMs power a consumer-facing platform used by millions, and you will own end-to-end model development from post-training to production.

You will work with Marco and the CTO across data, evals, and model behavior to push personalization, multilingual support, and faster training cycles at scale.