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The HR-first Knowledge Graph for Skills & Titles

Linking API

The Linking API is an HR-first knowledge graph that expands raw keywords into HR-grade synonyms and variants, linking them to normalized HR concepts (titles, skills, certifications, tools). Powered by Hiring Superintelligence, it ensures your databases, search, matching, and analytics stay consistent without manual taxonomy updates.

Read the Docs
~40k skills
~200k HR concepts
43+ languages
GDPR & EU AI Act
99.99% uptime
output.json
{
  "parsing": {
    "model": "hrflow-file-v2.1",
    "confidence": 0.92,
  },
  "profile": {
    "name": "John Smith",
    "title": "Data Scientist",
    "skills": ["ML", "Python"]
  }
}

Trusted by Customers, Partners & the AI Ecosystem

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API RESPONSE

Normalized HR Concepts & Fields

Send a raw keyword and get structured, normalized HR concepts (Titles, Skills, Certifications, Tools) with synonym expansion. Returns Top K-NN concepts with similarity scores to power your databases, search engines, matching, and talent analytics.

Linking Type

Keyword Linking

Send a raw keyword → returns Top K-NN Concepts + Similarity Scores

Explore

API EndpointTry Live Demo

Top Knowledge Graph Concepts

Titles

job-titles, degrees

Skills

hard-skills, soft-skills

Certifications

professional, compliance/safety, vendor

Tools

software tools, SaaS platforms, frameworks & libraries, equipment, machines, instruments, devices, vehicles

response.json
 1{
 2  "code": 200,
 3  "message": "Linking results",
 4  "data": [
 5    [
 6      "pattern_recognition",
 7      0.8787475228309631
 8    ],
 9    [
10      "artificial_intelligence",
11      0.8637734055519104
12    ],
13    [
14      "computer_vision",
15      0.8614324331283569
16    ],
17    [
18      "data_mining",
19      0.8590985536575317
20    ],
21    [
22      "algorithms",
23      0.8408169746398926
24    ]
25  ]
26}
CUSTOMER STORIES

Cleaner matching starts with cleaner language!

Trusted by HrTech & HR Professional Leaders

“

HR synonyms that actually work

vs. OpenAI/Gemini
Before HrFlow.ai

We tried prompt-based synonym expansion with OpenAI/Gemini, but results weren’t deterministic and were hard to productionize.

After HrFlow.ai

HrFlow.ai Linking gives stable Top-K concepts + scores, so HR query expansion is consistent and relevant.

“

No more title chaos across countries

vs. Textkernel
Before HrFlow.ai

Job titles were killing our analytics—same role, dozens of spellings, multiple languages.

After HrFlow.ai

With HrFlow.ai Linking we normalize titles and degrees into canonical concepts, and our filters and reporting stopped drifting.

“

Stops typos from costing hires

vs. In-house
Before HrFlow.ai

A single typo like ‘pyhton’ or a shorthand like ‘sr dev’ used to zero out results.

After HrFlow.ai

Linking fixes noisy inputs automatically and maps them to the right concepts, so we don’t lose candidates to spelling.

“

HR synonyms that actually work

vs. OpenAI/Gemini
Before HrFlow.ai

We tried prompt-based synonym expansion with OpenAI/Gemini, but results weren’t deterministic and were hard to productionize.

After HrFlow.ai

HrFlow.ai Linking gives stable Top-K concepts + scores, so HR query expansion is consistent and relevant.

“

No more title chaos across countries

vs. Textkernel
Before HrFlow.ai

Job titles were killing our analytics—same role, dozens of spellings, multiple languages.

After HrFlow.ai

With HrFlow.ai Linking we normalize titles and degrees into canonical concepts, and our filters and reporting stopped drifting.

“

Stops typos from costing hires

vs. In-house
Before HrFlow.ai

A single typo like ‘pyhton’ or a shorthand like ‘sr dev’ used to zero out results.

After HrFlow.ai

Linking fixes noisy inputs automatically and maps them to the right concepts, so we don’t lose candidates to spelling.

“

HR synonyms that actually work

vs. OpenAI/Gemini
Before HrFlow.ai

We tried prompt-based synonym expansion with OpenAI/Gemini, but results weren’t deterministic and were hard to productionize.

After HrFlow.ai

HrFlow.ai Linking gives stable Top-K concepts + scores, so HR query expansion is consistent and relevant.

“

No more title chaos across countries

vs. Textkernel
Before HrFlow.ai

Job titles were killing our analytics—same role, dozens of spellings, multiple languages.

After HrFlow.ai

With HrFlow.ai Linking we normalize titles and degrees into canonical concepts, and our filters and reporting stopped drifting.

“

Stops typos from costing hires

vs. In-house
Before HrFlow.ai

A single typo like ‘pyhton’ or a shorthand like ‘sr dev’ used to zero out results.

After HrFlow.ai

Linking fixes noisy inputs automatically and maps them to the right concepts, so we don’t lose candidates to spelling.

“

HR synonyms that actually work

vs. OpenAI/Gemini
Before HrFlow.ai

We tried prompt-based synonym expansion with OpenAI/Gemini, but results weren’t deterministic and were hard to productionize.

After HrFlow.ai

HrFlow.ai Linking gives stable Top-K concepts + scores, so HR query expansion is consistent and relevant.

“

No more title chaos across countries

vs. Textkernel
Before HrFlow.ai

Job titles were killing our analytics—same role, dozens of spellings, multiple languages.

After HrFlow.ai

With HrFlow.ai Linking we normalize titles and degrees into canonical concepts, and our filters and reporting stopped drifting.

“

Stops typos from costing hires

vs. In-house
Before HrFlow.ai

A single typo like ‘pyhton’ or a shorthand like ‘sr dev’ used to zero out results.

After HrFlow.ai

Linking fixes noisy inputs automatically and maps them to the right concepts, so we don’t lose candidates to spelling.

“

One normalization layer for the whole HR stack

vs. Regex + Vendors
Before HrFlow.ai

We had regex rules, vendor taxonomies, and inconsistent IDs across products.

After HrFlow.ai

HrFlow.ai Linking became our single normalization layer—database, search, scoring, and analytics all speak the same concept language now.

“

A knowledge graph that evolves

vs. DaXtra
Before HrFlow.ai

Daxtra’s taxonomy felt static and limited for multilingual hiring—we kept patching synonyms manually.

After HrFlow.ai

HrFlow.ai Linking is multilingual and continuously updated from labor market data, so new titles, skills, and variants show up without us maintaining endless keyword lists.

“

Certs, tools & equipment that map to what recruiters mean

vs. In-house
Before HrFlow.ai

Certifications were a mess—BLS vs CPR, local variants, vendor names, outdated labels—and tools/equipment were just as inconsistent (forklifts, CNC, SAP, TensorFlow).

After HrFlow.ai

HrFlow.ai Linking normalizes certs and tools (software + physical) into canonical concepts with scores, so eligibility rules, search filters, and matching stay precise and consistent across regions.

“

One normalization layer for the whole HR stack

vs. Regex + Vendors
Before HrFlow.ai

We had regex rules, vendor taxonomies, and inconsistent IDs across products.

After HrFlow.ai

HrFlow.ai Linking became our single normalization layer—database, search, scoring, and analytics all speak the same concept language now.

“

A knowledge graph that evolves

vs. DaXtra
Before HrFlow.ai

Daxtra’s taxonomy felt static and limited for multilingual hiring—we kept patching synonyms manually.

After HrFlow.ai

HrFlow.ai Linking is multilingual and continuously updated from labor market data, so new titles, skills, and variants show up without us maintaining endless keyword lists.

“

Certs, tools & equipment that map to what recruiters mean

vs. In-house
Before HrFlow.ai

Certifications were a mess—BLS vs CPR, local variants, vendor names, outdated labels—and tools/equipment were just as inconsistent (forklifts, CNC, SAP, TensorFlow).

After HrFlow.ai

HrFlow.ai Linking normalizes certs and tools (software + physical) into canonical concepts with scores, so eligibility rules, search filters, and matching stay precise and consistent across regions.

“

One normalization layer for the whole HR stack

vs. Regex + Vendors
Before HrFlow.ai

We had regex rules, vendor taxonomies, and inconsistent IDs across products.

After HrFlow.ai

HrFlow.ai Linking became our single normalization layer—database, search, scoring, and analytics all speak the same concept language now.

“

A knowledge graph that evolves

vs. DaXtra
Before HrFlow.ai

Daxtra’s taxonomy felt static and limited for multilingual hiring—we kept patching synonyms manually.

After HrFlow.ai

HrFlow.ai Linking is multilingual and continuously updated from labor market data, so new titles, skills, and variants show up without us maintaining endless keyword lists.

“

Certs, tools & equipment that map to what recruiters mean

vs. In-house
Before HrFlow.ai

Certifications were a mess—BLS vs CPR, local variants, vendor names, outdated labels—and tools/equipment were just as inconsistent (forklifts, CNC, SAP, TensorFlow).

After HrFlow.ai

HrFlow.ai Linking normalizes certs and tools (software + physical) into canonical concepts with scores, so eligibility rules, search filters, and matching stay precise and consistent across regions.

“

One normalization layer for the whole HR stack

vs. Regex + Vendors
Before HrFlow.ai

We had regex rules, vendor taxonomies, and inconsistent IDs across products.

After HrFlow.ai

HrFlow.ai Linking became our single normalization layer—database, search, scoring, and analytics all speak the same concept language now.

“

A knowledge graph that evolves

vs. DaXtra
Before HrFlow.ai

Daxtra’s taxonomy felt static and limited for multilingual hiring—we kept patching synonyms manually.

After HrFlow.ai

HrFlow.ai Linking is multilingual and continuously updated from labor market data, so new titles, skills, and variants show up without us maintaining endless keyword lists.

“

Certs, tools & equipment that map to what recruiters mean

vs. In-house
Before HrFlow.ai

Certifications were a mess—BLS vs CPR, local variants, vendor names, outdated labels—and tools/equipment were just as inconsistent (forklifts, CNC, SAP, TensorFlow).

After HrFlow.ai

HrFlow.ai Linking normalizes certs and tools (software + physical) into canonical concepts with scores, so eligibility rules, search filters, and matching stay precise and consistent across regions.

🔗 INTEGRATIONS

Works with the tools you use

Integrate 200+ tools with the flip of a switch.

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HrFlow.ai Data Studio

HrFlow.ai Data Studio

HR-native ETL with 200+ connectors plus Webhooks to ingest, normalize, and sync jobs & profiles across your stack—reliable pipelines with unified schemas.

Zapier ETL

Zapier ETL

No-code automation platform with 8,000+ app integrations to move data between tools using triggers + actions.

Make.com ETL

Make.com ETL

Visual automation platform to extract/transform/route data across 3,000+ apps (plus HTTP modules for any API).

Microsoft Flow ETL

Microsoft Flow ETL

Microsoft Power Automate—workflow automation with 1,000+ API connectors (and support for custom connectors).

Workato ETL

Workato ETL

Enterprise iPaaS/automation platform with 1,200+ pre-built connectors for orchestrating integrations and data workflows at scale.

Salesforce Flow Automation

Salesforce Flow Automation

Salesforce's low-code workflow automation tool; extended via AppExchange with 7,000+ apps to add integrations and capabilities.

🚀 KEY FEATURES

State-of-the-art HR Knowledge Graph Linking

HrFlow.ai Linking combines deep Natural Language Processing with a powerful RAG engine to expand and link raw keywords to normalized HR concepts at blazing speed. Trained on billions of HR data points, it delivers multilingual, typo-tolerant synonym expansion and consistent entities (titles, skills, certifications, tools) for production-grade search, matching, and analytics.

Tutorial Video3:45

🔒 ENTERPRISE-READY

Trust & Security

Built for sensitive HR data—secure by default, enterprise-ready.

01

Encryption

TLS in transit + encryption at rest to protect documents and extracted data.

02

Retention control

Minimal storage by default, with configurable retention policies to match your compliance needs.

03

AI-Act / GDPR / DPA ready

Built for sensitive HR data—secure by default, enterprise-ready. AI Act– and GDPR-ready processing, with documented controls for data handling and compliance. A Data Processing Agreement (DPA) is available on request.

04

Location / Region

Data processing and storage can be aligned with your required region (e.g., EU or US) depending on your deployment.

Visit Trust Center→
📊 FEATURE COMPARISON

HrFlow.ai Linking is the most integrated, fastest, and most accurate HR Knowledge Graph API

Feature
HrFlow.ai Linking
HrFlow.ai Linking
Lightcast
Lightcast
OpenAI/Gemini LLMs
OpenAI/Gemini LLMs
OpenAI/Gemini LLMs
Textkernel
Textkernel
Daxtra
Daxtra
Deployment & Trust
Foundation
2016
1999
2015
2001
2002
Headquarters
🇫🇷 France, 🇺🇸 USA
🇺🇸 USA
🇺🇸 USA
🇳🇱 Netherlands
🇬🇧 UK
🇺🇸 USA & 🇪🇺 EU Servers
Built-in
config
config
Built-in
Built-in
GDPR / AI-Act
By design
config
By design
By design
HR Compliance (Safety & Guardrails)
Built-in
Built-in
Built-in
Built-in
Pretraining Data
HQ HR Data
Web Job Data
Noisy & Biased Web Data
HQ HR Data
HQ HR Data
HR-Focused
Input Security (Prompt injection)
Unified output object (JSON drift)
Deterministic output values (hallucination)
Pricing model
per request
per taxonomy
per input+output tokens (expensive)
per request
per request
Speed (avg seconds / 1 request)
~100ms
~500ms
~2s
~1s
~1s
Core Technology
Technology
Deep NLP / LLM / RAG
Dense Vectors
LLM
Dense Vectors
Dictionary
Multilingual
43 lang
15 lang
40 lang
10 lang
10 lang
Dynamic Update
Labor Market
Labor Market
General Web
Labor Market
Static
Accuracy
High
Medium
High
Low
Low
HR Stack integrations (add-ons)
Resume, CV, Job parsers
Built-in (Parsing API)
Built-in
Config
Built-in
Built-in
HR data enrichment & taxonomies
Built-in (Asking/Tagging APIs)
Config
Search Engine Add-on
Built-in (Searching API)
Built-in
Built-in
Recommender System Add-on
Built-in (Scoring API)
Jobboards / ATS / HCM / HRIS connectors
200+ connectors (Data Studio)
Candidate & Recruiter UI
Widgets (App Studio)
❓ COMMON QUESTIONS

Frequently Asked Questions

Everything you need to know about the Linking API

🧩 COMPLETE API SUITE

Go beyond the Linking API

Our APIs are designed to complement each other and unlock your data's full potential

Full Extraction API Suite

Transform HR documents into structured, enriched Talent & Workforce Data — powering every layer of Hiring Intelligence.

API Overview
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Ranking API Suite

Unlock Hiring Superintelligence at scale — with transparent, fair, and explainable ranking across every Talent signal.

API Overview

GET STARTED

Ready to transform your HR data?

Start parsing resumes and job postings in minutes with our powerful API.

Start for free→Talk to sales

HrFlow.ai is an API-first company and the leading AI-powered HR data automation platform.

The company helps +1000 customers (HR software vendors, Staffing agencies, large employers, and headhunting firms) to thrive in a high-volume and high-frequency labor market.

The platform provides a complete and fully integrated suite of HR data processing products based on the analysis of hundreds of millions of career paths worldwide -- such as Parsing API, Tagging API, Embedding API, Searching API, Scoring API, and Upskilling API. It also offers a catalog of +200 connectors to build custom scenarios that can automate any business logic.

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