Singhal began a career that took him first to Hindustan Unilever Limited as a management trainee in 1997. Furtheron, looking for challenges, Singhal moved to Nigeria and took up a job with Multipro Consumer Products Limited in the year 1999. His talent and dedication led him to becoming a COO at Multipro, then CEO at Dufil Prima Foods. He then went on to join the family business of Tolaram. Under Singhal’s stewardship, Tolaram has evolved from a family enterprise into an international player that has made a difference in Africa.

The company, at 1999, was worth approximately INR 20 crore with only one production facility in one country. Deepak saw an opportunity where many others saw uncertainty. He believed in the mission of the company to transform lives and economies with sustainable business practices. In 2023, Tolaram's earnings had risen to around 12,000 crore rupees, with 28 production facilities functioning in Africa and the Middle East. Deepak launched plans in 2024 to expand the firm's footprint across Asian and Latin American markets. Tolaram is now one of Africa’s biggest FMCG brands and has built a reputation for its tenacity and versatility, operating across a broad array of businesses that stretch from consumer goods and digital services to infrastructure.