In Cuba

During his academic years, Núñez Oliva jointly worked for Cuba's press, radio, and Television. In 1989 he published the book De vuelta y vuelta, of humorous stories, in Havana, Cuba.^[3]

He hosted a talk show on current affairs, En Confianza, which was broadcast on Cuban Television in the early 1990s. Two years before he hosted the radio program Entre ocho y diez on Radio Ciudad de La Havana.^[3]

In 1990, he co-wrote with Jorge Luis Sanchez, Benito Amaro, and Felix de la Nuez a documentary, El Fanguito, highlighting several of Havana's poorest districts.^[5] He also participated in the workshops about telling a story conducted by Gabriel Garcia Marquez.^[6]

Together with Lizzette Vila, Jorge Puncheaux, Leticia Sánchez and Víctor Butari, Núñez Oliva created and launched the first weekly art and culture newscast on Cuban television in 1994, El Huron Azul.

In Mexico

Núñez Oliva first visited Mexico in 1989 for a year, during which he trained the staff at Radio Turquesa Cancun about organized programming as commercial radio FM was being introduced in the region.

After moving to Mexico City in 1994, Núñez Oliva worked for Reforma, La Cronica, and Diario La Jornada newspapers for a year.

In 1995, he produced the radio program De Musicos, Poetas, and Locos, for Radiopolis Televisa and then joined T.V. Azteca as a news producer.

In 1997 she met the vice president of production for Televisa Network, Jorge Eduardo Murguía, at the house of actor César Evora. Murguia invited Núñez Oliva to join his company, which he accepted that same year.

Núñez Oliva created and produced an entertainment T.V. show, Hoy (Today in English), which was aired on Channel 2, El Canal de las Estrellas, of Televisa in 1998. The program later became popular in Mexico and among the Spanish-speaking audience worldwide.^[7] In the same year, he directed Ritmoson Latino, a singing platform for Latin American singers for the urban genre.

In 1999, he founded Televisa Espectaculos with a team of reporters and cameramen. Then, the following year, Núñez Oliva was appointed as the general director the channel 4TV (now FORO TV), which became the first local channel in Mexico City.

He created the Proudly Latino Awards in 2004. It is an event for musical artists from the Spanish-speaking world in which award nominations, mentions and winners are based on public votes and the award is given to each artist in the country where is found. The prize is taken by a fan of the public chosen from among those who voted.

In 2012, Núñez Oliva became one of the Televisa advisors for Univision. The panel's motive was to increase the target audience of the programs through the rebranded TV network.

After two decades working at Televisa, he left the company in 2018 and then founded a content production company, 7 Emociones, the following year.^[8] As of 2019, Núñez Oliva manages 7 Emociones.^[9]

While working in Mexico, his management positions have included:

• Ritmoson Latino, General Director, 1999–2009 (Televisa)
• 4TV, General Director of Production, 2000–2002