Codesignal website screenshot

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 3 API contracts indexed on the APIs.io network, including Organization API, and 2 more. 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 engineering blog, authentication, documentation, API reference, support, pricing, signup flow, and 26 more developer resources.

🌐 Visit website 📡 Source on GitHub
47.0/100 developing ▬ flat Agent 38/100 agent ready Front door AI 6/6 dominant saas Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0
AccessSelf serve
1 published contract 1 MCP Servers
CompanyTechnical InterviewSkills AssessmentHiringRecruitingDeveloper SkillsAssessmentEducationGraphQLWebhook

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Human Capital Management
BC-300
Organization

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0
Composite quality — 47.0/100 · developing
Contract Quality 10.9 / 21
Developer Ergonomics 8.0 / 17
Access Clarity 6.7 / 17
Operational Transparency 4.1 / 11
Contract Governance 0.5 / 10
Discoverability 6.4 / 9
Regulatory Posture 6.8 / 15
Agent readiness — 38/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 6 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 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 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 4 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Education & Research regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. 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. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

GraphQL
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

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.

Codesignal Organization API

The Organization API from Codesignal — 5 operation(s) for organization.

Open Collections 2

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Codesignal Learn Public Organization API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Codesignal MCP Server

Official remote MCP server that lets AI agents work with CodeSignal assessments, candidate test sessions, and live interviews.

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Codesignal Webhooks

ASYNCAPI

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Codesignal Learn Overlay

7 actions · servers · codesignal-learn-openapi.json

UNRECORDED

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Codesignal Authentication

oauth2 · 1 scheme

SECURITY

Codesignal Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Codesignal Vulnerability Disclosure

security.txt · contact published

SECURITY

Codesignal Trust Center

trust center published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Codesignal Scopes

1 scope · clientCredentials

1 scopes

SCOPES

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 4

The organization behind the API

Blog
Blog
 BlogRSS
BlogRSS
 Blog
Blog
 Website
Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap
 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.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
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: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Technical Interview
- Skills Assessment
- Hiring
- Recruiting
- Developer Skills
- Assessment
- Education
- GraphQL
- Webhook
tags_raw:
- 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 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
- aid: codesignal:codesignal-organization-api
  name: Codesignal Organization API
  description: The Organization API from Codesignal — 5 operation(s) for organization.
  humanURL: https://developer.codesignal.com/
  baseURL: https://codesignal.com/learn
  tags:
  - Organization
  properties:
  - type: OpenAPI
    url: openapi/codesignal-organization-api-openapi.yml
common:
- url: https://codesignal.com/blog/
  type: Blog
- url: https://codesignal.com/feed/
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/codesignal-capability-edges.yml
  name: Codesignal Business Capability Map
- 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

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