Prove what you actually know

Validate your Java backend engineering skills with a rigorous 120-question assessment: core Java & OOP, collections & streams, JVM internals & garbage collection, concurrency, Spring Boot & REST, JPA/Hibernate, databases, testing, and design patterns. 60 minutes, basics to advanced, including code.

Prove you can build and ship both halves. 120 questions across core Java, Spring Boot and REST, JPA and SQL, the browser (HTML/CSS/TypeScript), React, and the seams between them — CORS, auth across the stack, Docker and CI. 60 minutes, basics to advanced, including code.

Prove your algorithmic problem-solving skills at FAANG interview difficulty. 60 questions spanning arrays, two pointers, binary search, trees, graphs, dynamic programming, and heaps. Each question tests both the solution and your ability to reason about time/space trade-offs.

Demonstrate mastery of distributed systems design at staff/principal engineer level. 40 in-depth questions on CAP theorem, consistent hashing, caching, message queues, database sharding, rate limiting, and complete system designs. Each question tests your ability to reason about trade-offs, not just recall facts.

Validate your Spring Boot expertise: IoC/DI, REST APIs, JPA, Spring Security, caching, testing, and production patterns. Earn a credential that proves you can build production-grade Spring applications.

Prove your database expertise: joins, indexing, transactions, ACID, window functions, query optimization, replication, and sharding. The certification every backend engineer needs.

Demonstrate mastery of microservices design patterns: service decomposition, API Gateway, Circuit Breaker, Saga, CQRS, event sourcing, distributed tracing, and inter-service communication.

Certify your CS core knowledge: Data Structures, Algorithms, Operating Systems, Computer Networks, DBMS, and Theory of Computation — at the level every backend interviewer expects.

Prove your Kafka expertise: topics, partitions, consumer groups, delivery semantics, log compaction, Kafka Streams, and Spring Boot integration. The certification for event-driven backend engineers.

Prove you can build production AI systems end to end: Python, LLM internals, prompting, RAG and vector search, agents and tool use, fine-tuning, evaluation, deployment, cost, and safety. 120 questions from basics to advanced, including code.

Validate real data engineering skill: advanced SQL, Python for data, data modeling and warehousing, batch and streaming (Spark, Kafka), orchestration (Airflow), the lakehouse (Delta, dbt), and data quality. 120 questions from basics to advanced, including code.

Prove you can do what a Forward Deployed Engineer does: write strong generalist code, integrate systems through APIs, reason about production systems and data, ship AI solutions, and deliver working software directly at a customer. 120 questions across six real-world domains, basics to advanced, including code.

Validate real analyst skill: SQL for analysis, pandas wrangling, exploratory analysis, statistics and inference, visualisation and communication, and experiment design. 120 questions from basics to advanced, including code and judgement calls.

Validate real data science skill: pandas and data wrangling, statistical inference, experiment design, classical machine learning, feature engineering and leakage, and honest model evaluation. 120 questions from basics to advanced, weighted towards judgement and the traps that break models in production.

Prove you can ship a production Next.js application. 120 questions across HTML, CSS and accessibility, JavaScript and TypeScript, React and forms, the App Router and server components, caching and server actions, and the server half — route handlers, auth, data and Web Vitals. 60 minutes, basics to advanced, including code.