Lucas Fernandes da Costa

Lucas da Costa is a software engineer, published author, international speaker, and professional problem solver. As an active member of the open source community, he is the core maintainer of some of the most popular JavaScript testing libraries, Chai and Sinon. Furthermore, he has contributed to numerous other projects, including Jest and NodeSchool.

In the past few years, Lucas has presented at numerous software engineering conferences in more than 10 countries.

His content has been voluntarily translated into many languages, including Russian, Mandarin, French, Portuguese, and Spanish, and is used as reference material in multiple software engineering courses around the world.

Lucas loves opinionated books, beautiful code, well-engineered prose, command-line interfaces, and Vim. In fact, he loves Vim so much that he has a :w tattooed on his ankle.