What Solid Online does

Solid Online is a Netherlands-headquartered integration platform vendor specializing in the European flex (staffing and recruitment) industry. Its flagship Connector product provides middleware that links recruitment/ATS systems (Bullhorn, Carerix, OTYS), HR/payroll platforms (AFAS, Visma|Raet Youforce, Exact Online), and back-office tools (Easyflex, HelloFlex, TimeChimp, FlexService), eliminating manual retyping of Excel lists and enabling real-time data synchronization across the staffing workflow. Add-on modules called Transformers handle hours-file validation/enrichment/routing and customer-specific invoice format conversion, while a Data Migration service supports transitions between staffing software platforms. Technical architecture centers on a proprietary platform developed in-house across Netherlands, India (Chennai) and Germany (Nuremberg), running on Microsoft Azure and supporting structured data formats including JSON, CSV, TXT, XLS, XLSM, XLSX, and XML.

The company sells primarily through a subscription model (annual Connector abonnement) complemented by professional services for implementation and migration, with pricing opaque and quote-based. Distribution combines direct enterprise sales with co-sell and referral partnerships from dominant staffing software vendors, and the company has been expanding from its Dutch base into Germany (Solid Online UG) and France under Directeur Général Thomas Luquet. Its customer base spans mid-market and enterprise staffing agencies (Kramp, Timing, NL Jobs, Byner, Oranjegroep, Actief Werkt!, NED Personeel, Noël Franklin, Novisource) as well as the staffing software vendors themselves. Founded in 1993 by Pieter Hoekstra, Solid Online remains a private, founder-led company with no disclosed external funding.

Name

Solid Online

Legal name

Solid Online

Website

https://solidonline.com

Company type

Private

Founded year

1993

Operating status

Operating

Headcount range

1–10 employees

Short description

Solid Online is a Netherlands-based integration platform vendor for the European flex and staffing industry, providing a proprietary Connector and Transformer middleware suite that links recruitment, HR, payroll and back-office systems for staffing agencies and software vendors across the Benelux, Germany and France.

Ownership category

akta.pro rank

Product category

Staffing Software Integration

NAICS

Custom Computer Programming Services (541511)

SIC

Services-Computer Integrated Systems Design (7373)

akta.pro primary industry

Data/Apps Connectivity & Adapters (Connectors, Drivers, SDKs) (HDAEAIAK)

akta.pro secondary industry

System Integration & Connectors (BPAMAOAC)

Keywords

• Staffing software integration
• HR data integration
• Payroll automation
• Recruitment system connectors
• Flex industry software

Headquarters

HQ city

Hoofddorp

HQ country

Netherlands

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Connector Subscription: The core Connector platform is offered as a subscription service (abonnement). Customers pay recurring fees for access to the integration platform, enabling seamless data transfer between staffing and HR systems.
2. Professional Services: Implementation, configuration, and data migration services are provided to help customers set up integrations and transition from legacy systems. These are one-time service engagements.
3. Transformer Add-ons: Hours Transformer and Invoice Transformer are add-on modules to the Connector platform, likely bundled into subscription tiers or offered as additional paid modules.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Solid Online develops and sells a proprietary integration platform called the Connector that links recruitment/ATS, planning, HR, payroll, and accounting systems used by staffing and flex agencies. The platform is complemented by the Uren Transformer and Facturen Transformer modules for automated hour file and invoice processing, and by a Data Migration service that transfers customer data between legacy and new systems.

Product overview

Solid Online offers a platform-plus-modules product architecture centered on the Connector - a flexible integration platform for the staffing/flex industry. The Connector enables fast, error-free data transfer between recruitment, HR, payroll and accounting systems. Add-on modules include the Uren Transformer (Hours Transformer) for automated hour file processing and the Facturen Transformer (Invoice Transformer) for customer-specific invoice conversion. Data Migration service completes the portfolio for system transitions. The platform handles JSON, CSV, TXT, XLS, XLSM, XLSX, and XML data formats with real-time synchronization.

Differentiator

Problem solved

Functional benefit

Brands

• Connector: The flexible linking platform for the flex industry providing fast and error-free data transfer between systems.
• Uren Transformer
• Facturen Transformer
• Data Migration
• Solid Solutions International

Quantifiable outcome

• Significant error reduction through automated data transfer replacing manual processes
• +4 more outcomes

Named customers15 records

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration16 records

AI capability2 records

Feature8 records

Partnerships

Six partnerships are on record, tiered core.

• BullhorncoreTechnology or IntegrationBullhorn provides an excellently documented API that Solid Online leverages to integrate Bullhorn ATS data to payroll and billing systems. Bullhorn actively refers customers to Solid Online for integrations, recognizing Solid Online as a reliable integration partner. Marco Boomsma, Sales Director Bullhorn EU, stated that Solid Online 'handles accurately, says what they do and does what they say.'
• AFAScoreTechnology or IntegrationAFAS provides ERP and payroll software that Solid Online integrates with, enabling staffing agencies to connect their ATS/recruitment systems to AFAS payroll and accounting. Christian Lankman, System Integrator AFAS, noted the partnership enables customers to 'connect their own ATS system to AFAS without having to worry about it.'
• EasyflexcoreTechnology or IntegrationEasyflex provides back-office staffing software that integrates with Solid Online's Connector. Marjolein Draaijer, Sales Consultant Easyflex, stated that 'the partnership with Solid Online certainly contributes' to Easyflex's ability to serve customers. Solid Online enables automated booking and data transfer to Easyflex.
• CarerixcoreTechnology or IntegrationCarerix provides recruitment/ATS software and partners with Solid Online to give customers 'the freedom to choose the best back-office' through flexible integrations. Arco Westbroek, Head of Products Carerix, noted the partnership applies 'best of breed' principles for front-office and back-office collaboration.
• Visma | RaetcoreTechnology or IntegrationVisma | Raet provides HR and payroll software (Youforce) that Solid Online integrates with OTYS recruitment system. Wesly van Horssen, Partner Manager technology at Visma | Raet, highlighted successful API link implementation and good support collaboration.
• OTYScoreTechnology or IntegrationOTYS provides recruitment software that integrates with Solid Online's Connector, enabling data exchange with payroll and accounting systems. Multiple customer case studies show successful OTYS integrations.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Zapier: Workflow automation platform connecting thousands of SaaS applications. Comparable to Solid Online in enabling connector-based data transfer, though primarily serving SMB/mid-market rather than enterprise staffing back-office workflows.
• Boomi: Enterprise iPaaS platform providing cloud-based integration, API management, and data connectivity. Comparable to Solid Online as a horizontal connector/integration platform, though operating across all verticals at a much larger scale.
• Tray.io: General-automation iPaaS for connecting SaaS tools, APIs, and data services. Comparable in delivering connector-based workflow integration, though at much larger scale and broader vertical reach.
• MuleSoft: Salesforce-owned enterprise iPaaS for API-led connectivity and system integration. Comparable to Solid Online in enabling structured data exchange between enterprise applications, with much broader horizontal scope.
• Celigo: Integration platform-as-a-service (iPaaS) with pre-built integrations and an integrator.io product. Comparable to Solid Online in connecting SaaS applications and automating data flows, but addressing horizontal use cases.
• SnapLogic: Enterprise iPaaS with AI-assisted integration pipelines and a wide library of pre-built connectors (Snaps). Comparable to Solid Online in delivering data integration across enterprise applications, but serving multiple verticals.
• Workato: Enterprise integration and automation platform (iPaaS) with pre-built connectors to ATS, HR, and payroll systems. Comparable to Solid Online in delivering app-to-app data flows, but serving broad enterprise use cases beyond staffing.
• Jitterbit: API integration platform providing iPaaS, EDI, and API management for enterprises. Comparable to Solid Online in B2B system integration, with broader ERP/EDI capabilities beyond the staffing vertical.
• Make: Visual automation platform (formerly Integromat) for connecting apps and transferring data between systems. Comparable to Solid Online in enabling multi-format data flows and integrations between business systems.

Emerging players

• Pipedream: Developer-focused integration platform offering workflows and code-level integrations across APIs. Comparable to Solid Online in API-based system integration, though positioned for technical users rather than domain-specialized staffing agencies.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/solid-online
• Xx.com/Solid_Online

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Solid Online