This year, the company placed 80th, alongside companies such as GoCardless and The Access Group.
Tech Track 100 was set up 19 years ago to celebrate Britain's fastest growing private technology, telecoms and media companies. Considerable sales transactions must be made by an organisation to be considered for the group.
The league table champions members and offers a platform to network, inspire and collaborate, pushing businesses to the next level and developing the industries they sit in.
ENSEK's CEO, Jon Slade, comments:
"To be listed in the Sunday Times Tech Track 100 for a second year running is fantastic news. The tech ecosystem within the UK is fast paced and hosts considerable growth. We're proud to be part of a group that not only helps simplify a complex industry, but also individual's lives. This is testament to the team's commitment for continuous innovation".