Codesignal

CodeSignal is a technical interview and skills-assessment platform used by companies to screen, interview, and upskill software engineers. Its developer surface includes a GraphQL API (companies, tests, test sessions, interviews, and interview templates), a versioned Learn REST API (OpenAPI 3.1) for organization members, skill sets, and learning progress, a webhook event API covering assessment, candidate, auditor, and live-interview workflows with HMAC-SHA256 signed deliveries, and an official remote MCP server that lets AI agents work with assessments, candidate sessions, and interviews. CodeSignal is backed by Menlo Ventures.

Codesignal publishes 1 API on the APIs.io network: Learn Public API. Tagged areas include Company, Technical Interview, Skills Assessment, Hiring, and Recruiting.

The Codesignal catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Codesignal’s developer surface includes authentication, documentation, API reference, support, engineering blog, pricing, signup flow, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub
46.4/100 developing Agent 64/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4
3 APIs 1 MCP Servers 0 Features
CompanyTechnical InterviewSkills AssessmentHiringRecruitingDeveloper SkillsAssessmentEducationGraphQLWebhooks

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 46.4/100 · developing
Contract Quality 9.4 / 25
Developer Ergonomics 11.3 / 20
Commercial Clarity 10.5 / 20
Operational Transparency 5.1 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 64/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 3 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/codesignal: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

CodeSignal Learn Public API

OAuth 2.0-protected REST API (OpenAPI 3.1) for reading organization members, their skill sets, and their learning progress on CodeSignal Learn.

CodeSignal GraphQL API

Primary GraphQL API for companies, tests, test sessions, live interviews, and interview templates. Authenticated with an API key.

CodeSignal Webhook API

Outbound webhook events across assessment, candidate, auditor, and live-interview workflows. Deliveries are signed with HMAC-SHA256.

MCP Servers

codesignal-mcp.yml

MCP SERVER

Event Specifications

Codesignal Webhooks

ASYNCAPI

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Webhooks
Webhooks
 Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 7

Authentication, authorization, and security posture

Authentication
Authentication
 OAuthScopes
OAuthScopes
 SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security
 TrustCenter
TrustCenter
 DomainSecurity
DomainSecurity

Scroll for all 7

Operate 2

Status, limits, changes, and where to get help

StatusPage
StatusPage
 Support
Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Blog
Blog
 Website
Website

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: codesignal
name: Codesignal
description: CodeSignal is a technical interview and skills-assessment platform used by companies to screen, interview, and
  upskill software engineers. Its developer surface includes a GraphQL API (companies, tests, test sessions, interviews, and
  interview templates), a versioned Learn REST API (OpenAPI 3.1) for organization members, skill sets, and learning progress,
  a webhook event API covering assessment, candidate, auditor, and live-interview workflows with HMAC-SHA256 signed deliveries,
  and an official remote MCP server that lets AI agents work with assessments, candidate sessions, and interviews. CodeSignal
  is backed by Menlo Ventures.
image: https://codesignal.com/wp-content/uploads/2022/12/codesignal-fallbck.jpg
url: https://raw.githubusercontent.com/api-evangelist/codesignal/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- menlo-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Technical Interview
- Skills Assessment
- Hiring
- Recruiting
- Developer Skills
- Assessment
- Education
- GraphQL
- Webhooks
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: CodeSignal Learn Public API
  description: OAuth 2.0-protected REST API (OpenAPI 3.1) for reading organization members, their skill sets, and their learning
    progress on CodeSignal Learn.
  humanURL: https://developer.codesignal.com/
  baseURL: https://codesignal.com/learn
  properties:
  - type: OpenAPI
    url: openapi/codesignal-learn-openapi.json
  - type: Overlay
    url: overlays/codesignal-learn-overlay.yaml
- name: CodeSignal GraphQL API
  description: Primary GraphQL API for companies, tests, test sessions, live interviews, and interview templates. Authenticated
    with an API key.
  humanURL: https://developer.codesignal.com/
  baseURL: https://app.codesignal.com/graphql
  properties:
  - type: GraphQL
    url: https://app.codesignal.com/graphql
  - type: Documentation
    url: https://codesignal.github.io/developer-docs/graphql/
- name: CodeSignal Webhook API
  description: Outbound webhook events across assessment, candidate, auditor, and live-interview workflows. Deliveries are
    signed with HMAC-SHA256.
  humanURL: https://developer.codesignal.com/
  baseURL: https://app.codesignal.com/client-dashboard/integrations/webhooks
  properties:
  - type: Webhooks
    url: asyncapi/codesignal-webhooks.yml
common:
- type: MCPServer
  url: mcp/codesignal-mcp.yml
- type: Webhooks
  url: asyncapi/codesignal-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Authentication
  url: authentication/codesignal-authentication.yml
- type: OAuthScopes
  url: scopes/codesignal-scopes.yml
- type: Conventions
  url: conventions/codesignal-conventions.yml
- type: ErrorCatalog
  url: errors/codesignal-problem-types.yml
- type: DataModel
  url: data-model/codesignal-data-model.yml
- type: Conformance
  url: conformance/codesignal-conformance.yml
- type: Lifecycle
  url: lifecycle/codesignal-lifecycle.yml
- type: StatusPage
  url: https://status.codesignal.com/
- type: Overlay
  url: overlays/codesignal-learn-overlay.yaml
- type: LLMsTxt
  url: llms/codesignal-llms.txt
- type: WellKnown
  url: well-known/codesignal-well-known.yml
- type: SecurityTxt
  url: well-known/codesignal-security.txt
- type: VulnerabilityDisclosure
  url: security/codesignal-vulnerability-disclosure.yml
- type: Security
  url: https://codesignal.com/security/disclosure-policy
- type: TrustCenter
  url: https://trust.codesignal.com/
- type: DomainSecurity
  url: security/codesignal-domain-security.yml
- type: DeveloperPortal
  url: https://developer.codesignal.com/
- type: Documentation
  url: https://developer.codesignal.com/
- type: APIReference
  url: https://codesignal.github.io/developer-docs/graphql/
- type: GitHubOrganization
  url: https://github.com/codesignal
- type: Support
  url: https://support.codesignal.com/
- type: Blog
  url: https://codesignal.com/blog
- type: Pricing
  url: https://codesignal.com/pricing
- type: SignUp
  url: https://app.codesignal.com/sign-up
- type: TermsOfService
  url: https://codesignal.com/terms
- type: PrivacyPolicy
  url: https://codesignal.com/privacy
- type: Website
  url: https://codesignal.com
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence