What is happening in HR technology?
Quick answer:
HR tech now has the capability to shift from single-suite systems to best-of-breed ecosystems made up of multiple specialist applications.
HR and iPaaS Connectors: Quietly Powering the Future of HR Tech
In today’s HR tech landscape, organisations can now assemble a portfolio of specialist tools such as recruitment, payroll, learning and performance from different vendors instead of just buying an integrated system that may have at least one weak module and be tied to it for up to seven years.
The challenge, of course, is to make all these systems work together. This is where iPaaS (Integration Platform as a Service) connectors come in.
So, what is an iPaaS?
It’s essentially a piece of kit that allows different software systems to talk to each other, passing data back and forth automatically, without any manual intervention or coding each time.
A connector is the component inside an iPaaS that handles the relationship with one particular software application. Think of it as a standardised plug or adaptor. Just as a travel adaptor lets you plug a UK device into a European socket without rewiring anything, a connector lets an iPaaS platform “plug in” to a specific system e.g. Workday, or Slack, or a payroll engine, using that system’s own language and rules.
Each connector typically handles authentication (proving you have permission to access the system), data translation (converting data into a format the receiving system understands), and the mechanics of sending or retrieving information via that system’s API (Application Programming Interface).
Some platforms will maintain a library of hundreds or thousands of pre-built connectors, meaning that connecting two common systems for instance an Applicant Tracking System to a Core HR platform can be achieved without writing code from scratch.
Why Connectors Matter to HR tech Buyers
Quick answer:
iPaaS connectors help HR teams implement systems faster, reduce reliance on IT, and make integrations more reliable and scalable
For an organisation selecting an HR technology stack, connectors are a handy measure of integration readiness. Here’s some reasons why they matter.
Speed to value.
A pre-built connector between two systems an organisation already uses, or plans to use, can reduce integration timelines from months to weeks. The “plumbing” is largely done; the work becomes configuration rather than construction.
Reduced dependency on IT and developers.
Many modern iPaaS platforms are designed to be used by non-technical staff. A good connector library makes this realistic as without connectors, every integration requires developer involvement, involving queues, cost, and risk.
Ongoing reliability.
Connectors are typically maintained by the iPaaS vendor or the software vendor itself. When an application updates its API, a maintained connector is updated accordingly. A bespoke integration on the other hand may simply break and stay broken until someone notices.
Future proofing and avoiding vendor lock-in.
When an organisation’s HR systems are connected through an iPaaS layer, as business requirements evolve, organisations can swap out individual systems without rebuilding their entire HR tech stack.
Due diligence.
During HR tech selection, the question “does this vendor have a connector on our iPaaS platform?” is a useful evaluation point. Its absence doesn’t disqualify a vendor, but it does represent real additional cost and effort.
Why Connectors Matter to HR Vendors
Quick answer:
For HR vendors, connectors enable faster market access, broader customer reach, and reduced integration development effort
For software providers, connectors are just as strategically important.
- Faster Market AccessInstead of building one-to-one integrations with every other system, vendors can connect once to an iPaaS platform and gain access to a broader ecosystem. Publishing a connector on a major platform signals maturity and investment in the partner ecosystem. It tells buyers and evaluators that this vendor takes connectivity seriously, which increasingly is a key element rather than a differentiator
- Increased Customer ReachBuyers are more likely to select a product that easily integrates with their existing tools. Being listed in the connector marketplace of a major iPaaS platform puts a vendor in front of buyers who are actively building or extending their tech stacks. It’s a form of distribution that doesn’t require a direct sales relationship.
- Focus on Core CapabilityA robust connector strategy means that vendors can concentrate on what makes their product unique, rather than having to invest heavily in integration development. Without good connectors, vendors can find themselves absorbing significant resource building one-off integrations for individual customers.
- Ecosystem ParticipationConnectors allow smaller, specialist vendors to compete alongside larger suites by “plugging into” existing environments.
- New Commercial ModelsSome vendors are now positioning themselves as “power-ups” or extensions to larger systems where the existing functionality is not sufficiently detailed or easy to use.
From Integration to Ecosystem
Quick answer:
iPaaS connectors are a strategic layer enabling the shift from standalone HR systems to an interconnected HR ecosystem
The real significance of iPaaS connectors is not technical but structural, as they enable a shift from systems to ecosystems, from rigid suites to flexible architectures. And of course, giving more choice to the buyer.
In this model, the value of an HR system is no longer defined solely by its features, but by how well it connects and collaborates with others.
A Quiet but Critical Layer
For sure, iPaaS connectors won’t feature in glossy product demos because that’s not what buyers initially get excited about, but they are becoming one of the key layers in HR technology.
Without them, the promise of flexible, best-of-breed HR stacks breaks down. With them, organisations gain the freedom to design their own HR ecosystem, one component at a time.
APPENDIX
Here we list some better-known iPaaS providers. Some have particular specialisms in connecting HR tech, others are more generalised. The listing does not include ratings on price or usability. Numbers of users may vary. We also include known HR connections where they have been published.
Category 1 — HR-Specialist Unified APIs
These are “write once, connect many” platforms specifically normalising HR data models. The right choice when you’re a SaaS vendor who needs to support multiple HR systems for your customers.
Bindbee
A newer challenger positioning hard against Merge on HR depth, Bindbee offers 60+ integrations across HRIS, ATS, Payroll, and Benefits data, with 27+ HRIS and ATS data models. Its differentiators are on-premises deployment, custom field support, and integrations built on demand, making it a strong fit for HR-specific use cases with data depth.
Finch
A textbook example of this category, providing a single unified API across HRIS and payroll systems. Standardises employment data into one data model.
- BambooHR
- Gusto
- HiBob
- Justworks
- Paychex
- Paycor
- Paylocity
- Rippling
- UKG Pro
- Workday
- Zenefits
Kombo
HR-only, strong European footprint. Kombo offers 250+ ATS, HRIS, payroll and LMS integrations with impressive depth across recruiting and HR domains. Unlike many unified APIs that focus only on reading data, Kombo enables writing back to HR systems, useful for applications that need to update employee information, manage benefits, or handle organisational changes. Kombo is ideal for B2B SaaS companies in HR tech, talent acquisition, fintech, and others needing to support multiple HR, ATS, and payroll tools without building each integration individually
- Access Group PeopleXD & PeopleHR
- ADP Workforce Now
- BambooHR
- Cornerstone OnDemand
- Dayforce
- Greenhouse
- Gusto
- Hailey HR
- HiBob
- Humaans
- IRIS Cascade Hri
- Workday, SAP SuccessFactors, SmartRecruiters, Factorial
- iCIMS
- MHR People First
- Namely
- Oracle HCM
- Oracle Recruiting Cloud
- OysterHR
- Paycom
- Paycor
- Paylocity
- Personio
- Sage HR
- SD Worx
- UKG Pro
- Zelt
- Zoho People
Merge
The market leader in breadth, Merge offers 180+ integrations across HRIS, ATS, Accounting, CRM, Ticketing, Marketing Automation, and File Storage platforms through a single unified API. HRIS and ATS coverage is strong and rapidly expanding. Their polished developer experience lowers the barrier for teams seeking breadth of integrations. Check how they manage unique data fields and how often the data is updated.
- ADP RUN
- ADP Workforce Now
- AllianceHCM
- Altera Payroll
- BambooHR
- Breathe
- Cezanne HR
- Charlie
- ClayHR
- Darwinbox
- Dayforce
- Deel
- Employment Hero
- Factorial
- Gusto
- HR Cloud
- HR Partner
- HRWorks
- Hailey HR
- Hibob
- Humaans
- IRIS Cascade
- IntelliHR
- Workday
Category 2 — HR-Specialist iPaaS with Managed Services
These platforms are HR-domain experts that combine a platform with hands-on implementation support. Better suited to enterprise employers and HR vendors than to SaaS companies wanting self-serve integration.
Flexspring
A boutique specialist, particularly strong on ADP connections, Flexspring focuses exclusively on HR data integration and has developed over 1,000 custom and turnkey integrations. Flexspring is an ADP Marketplace Platinum Partner and holds the only ADP data connector for BambooHR, Oracle HCM, and Greenhouse. The model is consultant-led: no internal IT resources are needed, as Flexspring experts create connectors and handle all custom integrations, with new connectors typically rolling out in 2–3 months.
Tavio
Tavio offers over 350 connectors across ATS, assessments, background screening, HRIS/HCM, learning, onboarding, payroll and performance management. The platform combines decades of HR tech expertise with robust engineering and a unified vision to eliminate data chaos in HR technology interoperability. The dual architecture, Tavio Studio for developers building complex integrations and Tavio Hub as a no-code deployment layer for business users is a real differentiator.
- BambooHR
- Dayforce
- Cornerstone OnDemand
- Greenhouse
- Oracle HCM
- Paylocity
- SAP Success Factors
- Taleo
- UKG Pro / Ready
- Workable
- Workday
Category 3 — General-Purpose iPaaS
These platforms connect thousands of applications, with HR being one category among many. Right for enterprise IT teams managing broad integration estates, maybe less so if HR integration is the sole use case.
Boomi
The accessible enterprise iPaaS, Boomi has over 23,000 global customers and is a leader in integration with a simple drag-and-drop setup. Strong on data integration and hybrid/on-premises scenarios, it is easier than MuleSoft but still requires IT involvement for meaningful HR workflows
- DarwinBox
- Deel
- Employment Hero
- Factorial
- Gusto
- HR Partner
- HR Works
- Kallidus
- Namely
- Oracle HCM
- Oyster HR
- Paychex
- Paylocity
- Personio
- Rippling
- Sage People
- Taleo
- UKG Ready & Ultipro
- Workable
- Workday
- Zenefits
Celigo
A mid-market iPaaS with a predictable pricing model. Celigo is available in three editions with no surprise costs or overage fees. HR coverage includes BambooHR, Paycom, and others, with packaged HR process templates. Good balance of power and accessibility, popular with HR ops and People teams who want to manage integrations themselves.
- ADP
- BambooHR
- Dayforce
- Workday
Jitterbit
An ERP and mid-market integration specialist. Jitterbit offers a low-code, iPaaS built for hybrid and enterprise environments with drag-and-drop integration and AI-assisted mapping HR coverage exists but it’s not a primary focus, as it is stronger on ERP and CRM integrations.
MuleSoft
The Salesforce-owned enterprise heavyweight. The enterprise pricing may require significant investment and could be best suited to Salesforce-centric enterprises with dedicated integration teams. There is powerful API governance and management capabilities but could have long implementation cycles.
Snaplogic
The data-pipeline-first iPaaS, Snaplogic offers over 450 pre-built and customised connectors with real-time and batch integration. Perhaps better suited to data warehousing and analytics pipelines than core HR workflow automation
Tray.io
Is designed to connect any system (CRM, finance, HR, data, etc) and provides workflow automation, orchestration, connectors, API management. It fits the definition of a broad integration layer that connects applications, data, and systems across an organisation.
- ADP
- BambooHR
- Greenhouse
- Gusto
- Paylocity
- Personio
- SAP Success Factors
- UKG Ultipro
- Workable
- Workday
- Zenefits
Workato
The mid-market/enterprise workflow automation leader, Workato connects over 10,000 applications with pre-built connectors for 1,000+ applications and a low-code recipe builder. HR automation across payroll, onboarding, and employee lifecycle is well supported.
- ADP
- Greenhouse
- Workday
WSO2
A full enterprise integration platform, covering API management, microservices, integration and DevOps. Designed for enterprise-wide digital architecture, it supports any domain and is not HR-specific.
Zapier
The SMB automation tool, Zapier offers a lightweight, no-code approach to automating workflows for small to medium-sized businesses and is well-suited for simple point-to-point use cases. HR connections exist for common tools but depth is shallow as there are no normalised HR data models, and it may struggle with complex payroll or compliance workflows.
- BambooHR
- Deel
- Factorial
- Greenhouse
- HiBob
- Oyster
- Small Improvements
- Workable
- Workday
- Zoho People
