{"id":34281,"date":"2025-08-25T13:55:19","date_gmt":"2025-08-25T16:55:19","guid":{"rendered":"https:\/\/building.nubank.com\/?p=34281"},"modified":"2025-08-25T13:55:46","modified_gmt":"2025-08-25T16:55:46","slug":"como-o-nubank-usa-risk-modelling-para-aumentar-limites-de-credito","status":"publish","type":"post","link":"https:\/\/building.nubank.com\/pt-br\/como-o-nubank-usa-risk-modelling-para-aumentar-limites-de-credito\/","title":{"rendered":"Como o Nubank usa risk modelling para aumentar limites de cr\u00e9dito"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">No nosso \u00faltimo Nu DS &amp; MLE Meetup, os Senior Data Scientists Jacob e Jos\u00e9 nos conduziram por uma imers\u00e3o no mundo complexo (e em constante evolu\u00e7\u00e3o) da gest\u00e3o de limites de cr\u00e9dito. E, claro, mostraram como a ci\u00eancia de dados nos ajuda a tomar decis\u00f5es mais inteligentes, escal\u00e1veis e sustent\u00e1veis para nossos clientes em toda a Am\u00e9rica Latina.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Com mais de 122 milh\u00f5es de clientes e crescendo, oferecer o limite de cr\u00e9dito certo \u00e9 tanto uma oportunidade de neg\u00f3cio quanto uma responsabilidade. Limites muito baixos podem frustrar nossos clientes. Limites muito altos podem expor tanto eles quanto o Nubank a riscos financeiros desnecess\u00e1rios. Como encontrar o equil\u00edbrio ideal? Vamos descobrir!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reformulando o desafio de modelagem de risco<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O centro da apresenta\u00e7\u00e3o foi nossa estrat\u00e9gia de modelagem de risco, especificamente para decidir quando e como aumentar o limite de cr\u00e9dito de clientes existentes. Jos\u00e9 come\u00e7ou contextualizando o desafio de neg\u00f3cio: gerenciar risco de cr\u00e9dito promovendo, ao mesmo tempo, sa\u00fade financeira e garantindo que nossos cart\u00f5es de cr\u00e9dito continuem \u00fateis e rent\u00e1veis.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para isso, o time foca em uma m\u00e9trica essencial: a probabilidade de inadimpl\u00eancia, ou seja, a chance de um cliente n\u00e3o pagar sua fatura dentro de um per\u00edodo determinado (normalmente entre 60 e 180 dias).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mas prever se algu\u00e9m vai ser inadimplente n\u00e3o \u00e9 suficiente, tamb\u00e9m nos importa quando. \u00c9 a\u00ed que entra a an\u00e1lise de sobreviv\u00eancia: uma abordagem mais sofisticada que modela o tempo at\u00e9 a inadimpl\u00eancia usando curvas de sobreviv\u00eancia, permitindo capturar n\u00e3o apenas o risco, mas sua evolu\u00e7\u00e3o ao longo do tempo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Combinando t\u00e9cnicas cl\u00e1ssicas com flexibilidade moderna<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Jacob mergulhou nos detalhes t\u00e9cnicos da nossa abordagem. Embora modelos tradicionais, como os n\u00e3o-param\u00e9tricos e param\u00e9tricos, ofere\u00e7am boas refer\u00eancias, cada um tem suas limita\u00e7\u00f5es. Os modelos n\u00e3o-param\u00e9tricos, por exemplo, n\u00e3o escalam bem e tendem a overfitting quando h\u00e1 muitas vari\u00e1veis envolvidas. J\u00e1 os param\u00e9tricos, apesar de interpret\u00e1veis, frequentemente dependem de suposi\u00e7\u00f5es fortes (e \u00e0s vezes equivocadas) sobre a distribui\u00e7\u00e3o dos dados.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para lidar com essas limita\u00e7\u00f5es, o time aplica uma estrat\u00e9gia de &#8220;dividir para conquistar&#8221;: primeiro constr\u00f3i um modelo robusto de ranqueamento de risco para capturar o sinal, e depois usa esse sinal para guiar o ajuste de curvas de risco mais precisas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esse processo em duas etapas permite atualiza\u00e7\u00f5es mais frequentes da calibra\u00e7\u00e3o das curvas de sobreviv\u00eancia, mantendo est\u00e1vel o modelo principal de ranqueamento. O resultado \u00e9 uma estrutura modular e escal\u00e1vel, que se adapta bem a diferentes pa\u00edses e a comportamentos de clientes em constante mudan\u00e7a.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Engenharia inteligente para um ambiente din\u00e2mico<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Claro, modelos eficientes s\u00e3o apenas parte da equa\u00e7\u00e3o. Jos\u00e9 encerrou destacando a import\u00e2ncia do monitoramento e da disciplina operacional. \u00c0 medida que o comportamento dos clientes muda \u2014 especialmente em mercados menos maduros como M\u00e9xico ou Col\u00f4mbia \u2014 o time acompanha de perto indicadores de performance, mudan\u00e7as de conceito (concept drift) e estabilidade de features. Isso inclui gerenciar os impactos de novos lan\u00e7amentos de produtos, oscila\u00e7\u00f5es macroecon\u00f4micas e altera\u00e7\u00f5es em dados externos de bir\u00f4s de cr\u00e9dito.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O time tamb\u00e9m destacou os investimentos em funda\u00e7\u00f5es s\u00f3lidas de engenharia: reposit\u00f3rios reutiliz\u00e1veis de features, pipelines de CI\/CD e alertas automatizados para baixo desempenho ou anomalias.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E eles n\u00e3o v\u00e3o parar por a\u00ed. O time j\u00e1 est\u00e1 experimentando modelos fundacionais treinados com trilh\u00f5es de transa\u00e7\u00f5es financeiras para explorar novas fronteiras na modelagem de comportamento dos clientes<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sa\u00fade financeira em escala<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Esta sess\u00e3o foi um mergulho profundo em como o Nubank toma decis\u00f5es de cr\u00e9dito baseadas em dados que escalam \u2014 n\u00e3o s\u00f3 em termos de tecnologia, mas tamb\u00e9m de impacto. Ao refinar continuamente nossos modelos, infraestrutura e estrat\u00e9gias, conseguimos oferecer cr\u00e9dito significativo ao mesmo tempo em que promovemos inclus\u00e3o financeira e estabilidade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Como disse Jacob: \u201cSempre buscamos metodologias simples, mas robustas \u2014 nunca est\u00e1ticas, sempre em evolu\u00e7\u00e3o.\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No Nubank, gerenciar limites de cr\u00e9dito de forma inteligente \u00e9 um compromisso com avalia\u00e7\u00e3o de risco escal\u00e1vel, inclus\u00e3o financeira e bem-estar de longo prazo dos nossos clientes. Ao combinar ci\u00eancia de dados robusta com pr\u00e1ticas de engenharia flex\u00edveis, conseguimos entregar decis\u00f5es de cr\u00e9dito que s\u00e3o n\u00e3o apenas precisas e eficientes, mas tamb\u00e9m alinhadas com a sa\u00fade financeira dos mais de 122 milh\u00f5es de clientes que atendemos em toda a Am\u00e9rica Latina.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quer saber mais sobre como estamos usando dados para gerar impacto em escala? Acompanhe o blog Building Nubank para mais conte\u00fados t\u00e9cnicos dos nossos times de engenharia e ci\u00eancia de dados.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/tTGmOwUkI4Q?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=pt-BR&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Como o Nubank usa modelagem de sobreviv\u00eancia, ranqueamento de risco e engenharia escal\u00e1vel para aprimorar decis\u00f5es de limite de cr\u00e9dito no Brasil, M\u00e9xico e 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