Social Discovery Group (SDG) is a group of social discovery companies. SDG solves the problems of loneliness, isolation, and disconnection - transforming virtual intimacy into the new normal. SDG’s products redefine the way people interact and connect with one another.

Our portfolio includes social entertainment platforms designed to connect people online across different cultures and regions of the world.

We bring together a team of like-minded people and IT professionals who specialize in creating and developing globally impactful social discovery products. Our international team of digital nomads works remotely from all over the world.

We’re proud to be a two-time “Great Place to Work” winner (USA & Japan, 2024–2025) and a Top-5 Company for Work-From-Anywhere Jobs (FlexJobs, 2025).

We are looking for
Machine Learning Engineer.
Your Main Tasks Will Be
- Set the ML direction: choose which strategic bets to make and tie each one to clear business needs.
- Drive LLM post-training and model adaptation end to end,



from dataset construction to fine-tuning and preference optimization.
- Design and build agent harnesses and tool-using LLM systems.
- Shape multi-agent development workflows that make the team faster and more effective.
- Build evaluation frameworks and LLM-as-a-judge systems that reliably predict real-world performance.
- Improve dialogue quality across memory, emotional intelligence, persona consistency, safety and anti-loop behavior.
- Ship production systems that directly shape user experience, retention and monetization.

We Expect From You
- Python expert level: clean code, typing, async, multiprocessing, profiling, debugging, notebooks + production code.Trainsformers.
- Training and fine-tuning LLMs.
- SFT, LoRA/QLoRA, PEFT.
- Preference optimization: DPO / ORPO / SimPO / CPO / GRPO or willingness to quickly go deep.
- Building datasets for LLM training: cleaning, filtering, deduplication, preference pairs, synthetic data, hard negative mining.
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📌 Senior ML Engineer (España)
🏢 Social Discovery Group
📍 España