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Toss

Fintech super-app for payments and banking

Machine Learning Engineer – LLM

Natural Language Processing & LLMsConfirmed live in the last 24 hours
Full-timeSeoul, South KoreaNo salary listedIn-person

About the Job

Requirements

  • Experience building and operating LLM or NLP models.
  • Experience independently owning the full cycle from data definition through model operations is desirable.
  • Ability to explain logically why a chosen approach is appropriate when solving problems.
  • Interest in the securities domain and in simplifying complex information through technology.

Responsibilities

  • Train models for text-based tasks such as classification, extraction, summarization, and translation.
  • Improve model quality through fine-tuning, experiment design, and performance evaluation.
  • Serve models in production services and operate them reliably.
  • Monitor and improve model performance degradation and changes in data distributions.
  • Reframe problems in finance and securities as problems that can be addressed with ML/LLMs.
  • Define and build datasets needed for model training.
  • Build and own the quality of classification and tagging models that transform unstructured source data such as news and disclosures into service-ready formats, including stock matching, industry classification, and importance assessment.
  • Build multilingual text models for classification, tagging, translation, and embeddings of global news and disclosures.
  • Collaborate with other teams to optimize AI features in products.

Desired Qualifications

  • Experience owning and improving an LLM/NLP model end to end.
  • Experience analyzing causes of performance degradation or data changes during service operations and making structural improvements.
  • Experience improving AI features from the perspective of user experience or product metrics rather than model performance alone.
  • Experience working with multilingual text data or training and evaluating cross-lingual models.

About the Company

Toss

Fintech super-app for payments and banking

Toss is a South Korean financial services platform that started as a peer-to-peer money transfer service and has grown into a digital 'super app' for personal finance. Its products are accessed through one mobile interface that unifies bank accounts, credit cards, loans, investments, and other financial services, including its own Toss Bank and Toss Securities. It differentiates itself by offering a broad, integrated ecosystem—combining digital banking, asset management, and brokerage services under one roof and running its own banking and securities units. Its goal is to become the leading consumer finance platform in South Korea while expanding its user base globally.

Company size
1,001-5,000
Company stage
Series G
Total funding
$1.5B
Headquarters
Seoul, South Korea
Founded
2011

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