The Enterprise Question Library — Or Bring Your Own
Never waste engineering panel hours authoring test problems from scratch. Choose from 2,000+ battle-tested assessments across every tech stack, or upload your proprietary challenges with guaranteed private tenant isolation.
Pre-Calibrated Library vs. Your Custom Questions
Whether you need standardized role blueprints right out of the box or want to evaluate candidates on your own production repo, ConceptNinjas has you covered.
Use Our Ready-to-Deploy Library
Designed by seasoned engineering leaders, our pre-calibrated batteries assess candidates with standardized difficulty curves across Junior, Mid, Senior, and Staff engineering tiers.
- Zero authoring effort: launch validated coding challenges in 60 seconds.
- Dynamic parameter randomization: prevents answer sharing across cohorts.
- Continuous refreshes: updated weekly by our dedicated content engineering team.
- Calibrated percentiles: benchmark scores against 500,000+ historical test-takers.
Best for: High-velocity hiring, standard frameworks, and campus batches.
Upload Your Own Proprietary Questions
Have unique architecture questions, proprietary microservices, or custom bug tickets? Upload them into our sandbox with custom unit tests and scoring weights.
- Private Tenant Guarantee: questions you upload can be used by your team only.
- Zero cross-company contamination: never shared, indexed, or visible to competitors.
- Custom multi-file repos: upload full zip archives with your preferred dependencies.
- Custom test assertions: define hidden test suites, memory limits, and timeouts.
Best for: Highly specialized engineering teams, proprietary SDKs, and deep architecture evaluations.
Explore 2,000+ Pre-Calibrated Assessments
Search by programming language, framework, seniority, or technology stack to find pre-calibrated test blueprints ready to send.
React.js & Next.js Core Architecture
Evaluates modern hooks, suspense, SSR rendering lifecycle, and component hierarchy design.
TypeScript Clean Architecture
Tests deep type safety, generic constraints, mapped types, and runtime data validation.
Vue.js & Nuxt 3
Evaluates reactivity caveats, component communication, and server-side state hydration.
Modern CSS, Tailwind & Design Systems
Tests responsive layouts, accessible color contrast, and scalable UI tokens.
Node.js & Express REST/GraphQL Services
Tests concurrency, memory management, stream processing, and secure API contract design.
Python FastAPI & Django High-Throughput APIs
Evaluates async coroutines, database connection pooling, and endpoint throughput.
Java Spring Boot Enterprise Architecture
Tests enterprise dependency injection, distributed messaging, and database transaction boundaries.
Go (Golang) Concurrent Systems & Microservices
Evaluates race conditions, mutex locking, memory allocation, and performant gRPC endpoints.
PostgreSQL & SQL Performance Tuning
Tests query execution plans, indexing strategies, deadlocks, and complex analytical queries.
Kubernetes & Container Orchestration
Evaluates cluster manifests, auto-scaling HPA, service discovery, and rolling release patterns.
Docker Containerization & Multi-Stage Builds
Tests image layer minimization, unprivileged user execution, and container isolation.
AWS Infrastructure as Code (Terraform)
Evaluates state management, least-privilege IAM configuration, and repeatable module architecture.
CI/CD Pipeline Automation (GitHub Actions)
Tests matrix testing configurations, deployment rollbacks, and fast build caching.
Applied LLM Engineering & RAG Pipelines
Evaluates semantic chunking, retrieval augmentation, hallucination mitigation, and API latency.
Python Data Science & Pandas Analysis
Tests vectorized manipulations, data imputation, aggregation pipelines, and statistical intuition.
Machine Learning Model Evaluation & Scikit-Learn
Evaluates loss functions, bias-variance tradeoffs, feature leakage, and model calibration.
React Native Cross-Platform Engineering
Evaluates native bridge performance, 60fps animations, memory leaks, and push notification cycles.
Swift & iOS UIKit / SwiftUI Architecture
Tests concurrency, retain cycle detection, Combine pipelines, and clean MVVM patterns.
Kotlin & Android Jetpack Compose
Evaluates UI recomposition cost, background coroutines, Flow emissions, and local caching.
Application Security & OWASP Top 10
Tests code remediation for common vulnerability patterns, sanitization, and secure auth tokens.
End-to-End Test Automation (Playwright / Cypress)
Evaluates robust locator strategies, parallel execution, network stubbing, and CI reporting.
Need Tests For a Private Internal Architecture?
Our assessment engineers will help you convert your internal codebase challenges into secure, proctored assessments exclusively for your organization.
Question Library & Authoring FAQs
Clear answers regarding test content, question ownership, and anti-leak protections.
Have specific questions about implementation, ATS integrations, or private team pilots?
Ready to Build a Technical Hiring Engine Your Team Can Trust?
Join thousands of engineering managers and recruiters who screen with certainty, cut panel fatigue, and hire top developers in record time.