Following his service at the Prime Minister's Office, Bisaria was seconded to the World Bank in Washington D.C. as an Advisor to the Executive Director for South Asia (2004–2008), where he worked on development projects and aid issues, contributing to corporate governance and India’s multilateral economic diplomacy. He was involved in developing a policy approach to enhance India’s rankings in reports on the Ease of Doing Business. In 2009, Bisaria returned to Delhi to serve as Joint Secretary (Eurasia) in the Ministry of External Affairs (2009–2014). In this role, he coordinated India's foreign policy and bilateral relations with the Eurasia region (including Russia, Ukraine and Central Asia). He was the principal architect behind the United Progressive Alliance government's new policy outlook for India in Central Asia (‘Connect Central Asia’) and coordinated India’s approach to six annual Indo-Russian summits, including the first annual summit between Prime Minister Modi and President Putin in India in December 2014. Additionally, he led the development of the India-Russia ‘special and privileged strategic partnership’. He also worked on India’s relationship with multilateral institutions like the Shanghai Cooperation Organisation, including managing India's application to join the group, and led India's participation in the Russia–India–China trilateral dialogue. In January 2015, Bisaria was appointed India’s Ambassador to Poland, based in Warsaw, with concurrent accreditation to Lithuania, serving until November 2017. During his time in Poland, he focused on forging economic partnerships and deepening India’s cultural footprint in Central and Eastern Europe. He also served as India’s representative in the Warsaw-based Community of Democracies, participating in the Community meetings in Warsaw, Geneva and New York. As High Commissioner to Pakistan From December 2017 to February 2020, Bisaria served as India's High Commissioner to Pakistan. During his tenure, Pakistan and India experienced a decline in bilateral relations – arising from increased violence and terrorism emanating from Pakistan, particularly in the contested region of Kashmir. He was in Pakistan at the time of a terrorist attack by the Pakistan-based Jaish-e-Muhammad in Pulwama, which culminated in the Balakot airstrike, the first instance of aerial combat between Indian and Pakistani air forces since the Bangladesh Liberation War in 1971. Prior to these events, however, Bisaria helped India establish a relationship with the newly-elected Tehreek-i-Insaf Government of Prime Minister Imran Khan. He also worked on efforts to expand Indian nationals' access to the Kartarpur Corridor. He returned to India in August 2019, when Pakistan downgraded