--- title: "6 Assessment APIs to Integrate With in 2026: Greenhouse, Workable, Ashby" img: https://s3.us-east-2.amazonaws.com/unified-article-images/6_assessment_apis_to_integrate_with_in_2026_greenhouse_workable_ashby-icon.png date: 2026-03-11T16:44:00.000Z tag: Product description: "Hiring assessments have become a core part of modern recruiting workflows. From coding tests and skills assessments to behavioral and personality evaluations,..." url: "https://unified.to/blog/6_assessment_apis_to_integrate_with_in_2026_greenhouse_workable_ashby" --- # 6 Assessment APIs to Integrate With in 2026: Greenhouse, Workable, Ashby ------ _March 11, 2026_ Hiring assessments have become a core part of modern recruiting workflows. From coding tests and skills assessments to behavioral and personality evaluations, many companies now rely on assessment platforms to evaluate candidates before interviews. As a result, **assessment APIs** have become an important part of the recruiting software ecosystem. They allow SaaS platforms to trigger assessments automatically, track results, and synchronize outcomes directly with Applicant Tracking Systems (ATS). However, integrating assessment providers directly with every ATS platform introduces complexity. Each ATS exposes different assessment APIs, webhook formats, authentication models, and data schemas. In this guide, we'll cover **6+ assessment APIs developers commonly integrate with**, the challenges of building assessment integrations, and how unified assessment APIs simplify multi-platform recruiting workflows. ## What Is an Assessment API? An **[assessment API](/assessment)** allows software applications to deliver candidate assessments and synchronize results with recruiting platforms. Assessment APIs typically support operations such as: - creating assessment packages - ordering assessments for candidates - receiving assessment orders from an ATS - tracking assessment status - submitting results back to recruiting systems - retrieving assessment reports These APIs power recruiting workflows including: - technical coding assessments - aptitude and skills testing - behavioral or personality assessments - interview preparation assessments - background screening integrations - credential or compliance assessments Many ATS platforms now provide built-in assessment APIs so recruiters can request assessments directly within their recruiting workflow. ## Why SaaS Products Integrate Assessment APIs Recruiting software increasingly integrates assessments to improve hiring quality and reduce manual screening. Common use cases include: ### Candidate skills testing Automatically send coding challenges, technical assessments, or role-specific tests to candidates. ### Behavioral and personality assessments Evaluate communication style, teamwork traits, or leadership qualities before interviews. ### Interview preparation assessments Send pre-interview exercises that help candidates demonstrate skills. ### Background or compliance verification Trigger background or verification assessments during specific hiring stages. ### Automated hiring workflows Automatically trigger assessments when candidates reach specific stages in an ATS pipeline. Because these workflows often live inside ATS systems, assessment integrations must support multiple recruiting platforms. ## 6+ Assessment APIs Developers Integrate With Below are some of the most common ATS-connected assessment APIs used by recruiting software. ### Greenhouse Assessment API [Greenhouse Developer Platform](https://developers.greenhouse.io/) Greenhouse is one of the most widely used ATS platforms for technology companies. Its assessment integrations allow recruiters to trigger third-party assessments directly from within the Greenhouse hiring pipeline. Typical capabilities include: - ordering candidate assessments - attaching results to candidate profiles - synchronizing status updates - returning assessment scores to hiring teams Greenhouse integrations are common for coding tests, technical screening, and behavioral assessments. ### Workable Assessment API [Workable Developer API](https://developer.workable.com/) Workable provides recruiting software used by thousands of companies worldwide. Its assessment integrations allow recruiting teams to: - trigger assessments automatically during hiring workflows - send candidate data to assessment providers - receive results directly inside the ATS - track candidate progress through evaluation stages Workable is frequently integrated with skills testing and interview preparation platforms. ### Ashby Assessment API [Ashby API Documentation](https://developers.ashbyhq.com/) Ashby is a modern recruiting platform built for scaling companies. Its API-first architecture allows assessment providers to integrate tightly into the recruiting workflow. Common integration capabilities include: - assessment ordering - webhook notifications when recruiters request tests - candidate data synchronization - structured scorecard submissions Ashby integrations are popular with recruiting automation platforms and developer assessment tools. ### Recruitee Assessment API [Recruitee Developer Docs](https://developers.recruitee.com/) Recruitee provides recruiting software used by many growing companies and startups. Assessment integrations allow recruiting teams to: - trigger assessments for candidates - track completion status - attach results to candidate profiles - automate hiring workflows Recruitee supports webhook-driven integrations for real-time assessment updates. ### TalentLyft Assessment API [TalentLyft Platform](https://www.talentlyft.com/) TalentLyft is a recruiting platform designed for talent acquisition teams and hiring automation. Assessment integrations support workflows such as: - candidate screening tests - behavioral assessments - recruitment marketing evaluations - pipeline-stage triggered testing These integrations help recruiters evaluate candidate capabilities earlier in the hiring process. ### Cornerstone Assessment API [Cornerstone OnDemand Platform](https://www.cornerstoneondemand.com/) Cornerstone provides enterprise talent management and recruiting infrastructure. Assessment integrations allow organizations to: - deliver assessments during hiring processes - track candidate evaluation results - integrate training or certification workflows - analyze candidate performance data Cornerstone integrations are often used by large enterprises with complex hiring pipelines. ## Challenges When Integrating Assessment APIs Assessment integrations are more complex than simple data retrieval APIs because they involve asynchronous workflows. Common challenges include: ### Different ATS assessment APIs Each ATS platform implements assessment integrations differently. ### Webhook complexity Assessment requests are typically delivered through [webhooks](/blog/replacing_polling_with_unified_webhooks_and_virtual_streams) rather than API polling. ### Inconsistent order payloads Candidate information, job references, and assessment parameters vary across platforms. ### Result submission differences Each ATS expects different formats for submitting assessment results. ### Workflow orchestration Assessment workflows must synchronize candidate data, status changes, and results across systems. Supporting multiple ATS platforms quickly becomes a maintenance challenge. ## The Role of Unified Assessment APIs To simplify assessment integrations, many SaaS platforms adopt **unified assessment APIs**. A [unified API](/technology) standardizes the integration layer across multiple ATS systems so developers can integrate once and support multiple recruiting platforms. Instead of building separate integrations for Greenhouse, Workable, Ashby, and others, a unified API provides: - standardized assessment package structures - consistent webhook events for new orders - normalized candidate and job data models - unified result submission endpoints - simplified authentication flows This approach allows assessment providers to support multiple ATS platforms through a single integration. ## Build Once with the Unified Assessment API The **Unified Assessment API** allows developers to integrate with **6+ ATS assessment platforms** through one standardized API. You can explore the category here: [Unified Assessment API](https://unified.to/assessment) Unified normalizes assessment workflows across platforms including Ashby, Greenhouse, Workable, Recruitee, TalentLyft, and Cornerstone. ### Unified Assessment Data Objects Unified standardizes assessment integrations using two primary objects. **Assessment Packages** Define available assessments that recruiters can order from within their ATS. **Assessment Orders** Represent assessment requests submitted by recruiters for candidates. Orders include: - candidate details - job references - application identifiers - order status - scores and completion results - downloadable assessment reports Each object supports consistent API operations: - create - list - retrieve - update - remove This structure allows developers to build assessment workflows once and support multiple ATS platforms. ## Common Assessment Integration Use Cases Unified assessment APIs support many recruiting workflows. ### Candidate skills testing platforms Send coding or technical tests when recruiters request assessments from their ATS. ### Behavioral and personality assessments Collect candidate responses and return structured results to hiring teams. ### Background or compliance verification Integrate verification workflows into recruiting pipelines. ### Interview preparation assessments Provide pre-interview exercises that help candidates demonstrate their capabilities. ### Recruiting analytics Track candidate performance across assessments and hiring pipelines. ## Real-Time Assessment Workflows Unified uses a **real-time webhook architecture** for assessment orders. When a recruiter requests an assessment in their ATS: 1. Unified immediately delivers an order webhook. 2. The assessment platform sends the test to the candidate. 3. Results are submitted back through the Unified API. 4. The ATS receives the results instantly. This architecture ensures recruiters always see the latest candidate evaluation results. ## Zero-Storage Architecture Unified never stores assessment data. All requests are processed statelessly and routed directly to the source ATS platform. This provides several benefits: - reduced compliance scope - lower risk for candidate data exposure - simplified privacy and audit requirements - real-time synchronization of results For recruiting workflows involving sensitive candidate information, minimizing stored data significantly improves security. ## Final Thoughts Assessment APIs are becoming a critical component of modern recruiting infrastructure. But supporting multiple ATS platforms individually can quickly become difficult to maintain. Unified assessment APIs allow developers to integrate once and support **multiple ATS assessment platforms** through a single integration layer. For assessment providers, recruiting software vendors, and hiring automation tools, this architecture dramatically simplifies building scalable assessment integrations. [→ Start your 30-day free trial](https://app.unified.to/login) [→ Book a demo](https://calendly.com/d/cph9-g8n-jzg/connect-with-unified)