- O' Neill, Kimberly: Foundation Level
- O'Brien, Katlyn J: Foundation Level
- O'connor, Marian: Foundation Level
- O'Gorman, Kieron James: Foundation Level
- O'Hanley, Lisa Denise: Foundation Level
- O'Neill, Troy James: Foundation Level
- O'Regan, Katherine: Foundation Level
- O'Reilly, Steven: Foundation Level
- Oakley, Helen: Foundation Level
- Obad, Dennis: Foundation Level
- Oberoi, Taranjeet: Foundation Level
- Obiki, Ndudi: Foundation Level
- Obradovic, Dragoslav: Foundation Level
- Oburi, Naveen : Foundation Level
- Odeniyi, Austin: Foundation Level
- Odetoyinbo, Adetomiwa: Foundation Level - Agile Tester
- Odetoyinbo, Adetomiwa: Foundation Level
- Ogadu, Ehimen: Foundation Level - Acceptance Testing
- Ogboghodo, Dennis: Foundation Level
- Ogden, Tracy Lea: Foundation Level
- Ogunwale, Bukola: Foundation Level
- Oh, Kwang Tae (Ted): Foundation Level
- Oka, Leo: Foundation Level
- Okaekwu, Adesua: Foundation Level
- Okaekwu, Onyeka Malcolm: Foundation Level
- Olabode, Temitope: Foundation Level - Agile Tester
- Olabode, Temitope: Foundation Level
- Oladele, Kunle Oladipo: Foundation Level
- Oladimeji, Christopher A D: Foundation Level
- Olantunde Olaleye, Anthony: Foundation Level
- Olisekwe, Chioma: Foundation Level
- Oliver, Sylvie: Foundation Level
- Olivieri, Celina M.: Foundation Level
- Olorunsola, Lola: Foundation Level
- Olugbenjo, Debbie: Foundation Level
- Olusile, Ademola : Foundation Level
- Oluyomi, Emmanuel: Foundation Level
- Omer, Sardar Usman: Foundation Level
- Omid, Mohammad Elham: Foundation Level
- Omodara, Bamidele: Foundation Level
- Omotosho, Balqees O.: Foundation Level
- Ong, Jonathan: Foundation Level
- Ong, Marilyn: Foundation Level
- Ong, Patricia: Foundation Level
- Onyeogu, Frank Azubuike: Foundation Level
- Onyeogu, Frank Azubuike: Advanced Level - Test Manager
- Onyshchuk, Roman: Foundation Level
- Or, Yee Wa: Foundation Level
- Orajiaka, Blessing: Foundation Level
- Oravampuram Mana, Jisha: Foundation Level
- Organ, Daniel: Foundation Level
- Orozco, Luis: Foundation Level
- Orozco, Luis: Advanced Level - Test Manager
- Orti, Carol V.: Foundation Level
- Ortiz, Miguel Angel: Foundation Level
- Ortiz Ayma, Giovana Jenny: Foundation Level
- Ositashvili, Caterina: Foundation Level
- Osman, Bulban: Foundation Level
- Osman, Mohamed: Foundation Level
- Osmond, Paul: Foundation Level
- Ostrobrod, Leonid: Foundation Level
- Ostrowski, Teresa: Foundation Level
- Otman, Saufi: Foundation Level
- Ottati, Ignacio: Foundation Level
- Ou, Hai Ying: Foundation Level
- Ouafi, Haykel: Foundation Level
- OUDDAI, Sarra: Foundation Level
- Ouimet, Elise: Foundation Level
- Ovens, Barry: Foundation Level
- Oxenham, Michael: Foundation Level
- Oxenholm, Meredith: Foundation Level
- Oyetti, Jonathan: Foundation Level
- Ozogbuda, Japhet: Foundation Level