Zellis Tech Stack

UK's leading HR, payroll, and workforce management platform serving 1-in-7 workers

Software Development Bristol, England 1,001–5,000 employees Founded 1963 Privately Held

Zellis operates a consolidated HR and payroll platform across the UK and Ireland, built on Java/Spring Boot with React and Kafka, running on Azure and Kubernetes. The company is sales-led (6 of 21 active hires) with concurrent focus on revenue operations, CRM implementation, and cloud migration—signaling a shift from on-premise delivery toward SaaS operations. Pain points center on post-merger integration, cost-to-serve, and compliance, which map directly to 2025's consolidation of three legacy products (Zellis, elementsuite, Hastee) into a single platform.

Tech Stack 44 technologies

Core StackGitHub Copilot Java Hibernate JavaScript React Native Angular React Kafka Azure DevOps webpack JUnit Docker Kubernetes HubSpot Workday VMware OpenAI API Spring Boot Spring Security HTML CSS Artifactory Yarn Gradle Mockito Excel Word PowerPoint Visio Azure+14 more

What Zellis Is Building

◆Challenges

Reducing friction in selling process
Retaining customer base
Customer partnership improvement
Post-merger integration
Quality of payroll services
Reducing cost to serve
Improving customer satisfaction
Reducing risk
Maintaining compliance
Transitioning soc 1 activities

▲Active Projects

Process improvement initiatives for sales
Automation of payroll processes
Compliance integration during mergers and acquisitions
Revenue operations roadmap development
Crm implementation and administration
White space analysis
Conversion of reports to cloud
Digital transformation initiatives in payroll operations
Process re-engineering
Change initiatives to reduce waste

Hiring Activity

Accelerating20 roles · 10 in 30d

Department

Sales

Marketing

Engineering

Ops

Product

Security

Support

Data

Seniority

Senior

Director

Manager

Mid

Lead

Notable leadership hires: Account Director, Engineering Technical Lead

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About Zellis

Zellis is the leading HR, payroll, workforce management, and benefits provider in the UK and Ireland, covering approximately 1 in 7 of the region's working population. The company supports the full employee lifecycle through HCM Cloud and integrated payroll solutions, alongside managed services for workforce operations. Founded in 1963 and privately held, Zellis operates at 1,001–5,000 employees across the UK, Ireland, and India. In 2025, the company unified three acquired product lines (elementsuite and Hastee) into a single coherent platform to streamline HR, payroll, and WFM delivery for mid-market and enterprise clients.

HeadquartersBristol, England

Company Size1,001–5,000 employees

Founded1963

Hiring MarketsIreland, United Kingdom, India

Frequently Asked Questions

What tech stack does Zellis use?

Zellis builds on Java, Spring Boot, React, and Kafka, deployed on Azure with Kubernetes orchestration and Docker containerization. The stack includes GitHub Copilot for development and OpenAI API integration, alongside HubSpot for CRM and Workday for talent/finance integration.

Where is Zellis headquartered?

Zellis is headquartered in Bristol, England. The company operates across the UK, Ireland, and India, employing 1,001–5,000 people.