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Sirenum

Workforce management software for shift-based staffing agencies, now sold as Bullhorn Workforce Management

  • Founded 2013

About Sirenum

Sirenum is workforce management software for staffing businesses that place people into shifts, and it is now offered under the name Bullhorn Workforce Management. Agencies use it to match qualified, available workers to open shifts while keeping compliance and payroll in the same system. Its focus includes clerical and light industrial recruitment.

What Sirenum offers

  • Scheduling and rostering — tools for filling shifts with suitable workers who are free to take them.
  • Compliance tracking — records showing whether workers meet the requirements for a role.
  • Payroll — pay functions tied to the shifts worked.
  • Worker mobile app — a platform that keeps temporary staff engaged and informed.
  • Client self-service — options for clients to handle their own requests.

Who it works with

It serves shift-based staffing agencies, including global firms, which use it to manage shift cover, automate contact with workers and make recruiters more efficient.

Key facts

  • Based in: United Kingdom
  • Now part of: Bullhorn, sold as Bullhorn Workforce Management
  • Sectors: clerical and light industrial staffing

Profile written by TrustList from the business's own published information, Sep 2026.

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