London-based workforce management technology platform Sirenum has raised £2 million in its latest round from former Tesco CEO Sir Terry Leahy alongside the William Currie Group. The investment will be used to drive company growth and further international expansion, as well as accelerating new product development.

Sirenum addresses a number of markets and HR challenges across its product suite, including workforce management, a market set to be worth $9.3 billion by 2025, vendor management, which will be worth $2.96 billion by 2024, and global employee engagement, a market that will be worth $2.1 billion by 2026. In addition the global time and attendance software market, which Sirenum also services, will be worth $2.49 billion by 2027.

With the increasing use of shift workers and temporary staff – as a result of the gig economy, the rise in ecommerce, and more companies embracing the benefits of outsourcing – HR tech solutions are of great interest to investors. As a leading provider of HR technology built on the Salesforce platform, Sirenum supports a diverse set of industries such as staffing, transportation, construction, hospitality, healthcare, and logistics and is ideally placed to capitalise on this trend.

Clients who use Sirenum to manage, schedule, and monitor workers, as well as process payroll and invoicing include Randstad, Impellam, Manpower and GI Group. Sirenum also powers workforce management for employers in sectors like government, utilities, transportation, and more, such as the Scottish government, FirstGroup, National Grid, and the NHS. 

“Sirenum has performed well during the pandemic exhibiting strong and sustainable growth. I am especially proud of our support for hospitals, vaccination centres, and volunteer organisations combating the pandemic. With the advent of the gig economy, there is no doubt Sirenum’s unique offering as a ‘gig technology platform’ with strong compliance features will make it key in the future for sectors like healthcare, logistics, and others.” Comments Sir Terry Leahy.

“We’re thankful to our investors for their continued support and for seeing the vision we have for Sirenum in the future. Our continued growth across a variety of industries, as well as new use cases that could not have been foreseen, such as that created by the new vaccination centres, highlight the unique proposition we offer. Moreover, we believe the flexibility of the platform to adjust to unpredictable scenarios, i.e the ability to manage rosters and staff shifts in real time and adjust for sickness or the need to isolate, further underlines why there has never been a better time to invest in workforce management technology like ours. The pandemic has expedited the need for businesses to embrace technology across various parts of their operation, but it is the commercial opportunity for staffing agencies and other employers of shift workers looking for a competitive advantage that will truly propel the use of our technology in the future.” Said Benjamin Rubin, CEO and founder of Sirenum.

Sirenum was founded in 2013 by Benjamin Rubin following over a decade of staff management experience. Co-founders include Joshua Pines, who has over 20 years of experience in technology marketing and strategy leadership roles and Ben Hizak, who has over 15 years of experience advising companies on IT and information solutions.

For more information on Sirenum, please visit

Editors Notes:

Sirenum powers the dynamic workforce. As the leading global provider of cloud-based workforce management technology to employers of complex workforces, Sirenum provides transformational technology to innovative employers, streamlining the management of nearly 400,000 workers across six continents, including organisations in the staffing, government, transport and logistics, care, and security and events verticals. To learn more about Sirenum technology for dynamic workforce management, please visit

Media contact for Sirenum:

Karolina Throssell.
E: T: 07855 751005