Distributed Systems Fundamentals Certification

The Distributed Systems Fundamentals Certification is a free advanced-level, 25-minute skill test from Science of Apps. It tests distributed systems fundamentals — failure models and partial failure, networks, latency and the fallacies of distributed computing, time, clocks and ordering with Lamport and vector clocks, replication strategies, consistency models from linearizability to eventual consistency, the CAP theorem and PACELC, consensus with Paxos and Raft, leader election and quorums, partitioning and consistent hashing, distributed transactions with two-phase commit and sagas, idempotency and exactly-once myths, message queues and logs, load balancing, retries, timeouts and backoff, observability and SRE practice, and testing with fault injection — written to Designing Data-Intensive Applications, the Raft paper, Lamport's work, Jepsen and the Google SRE book for 2026 and 2027. Score 70% or more on its 25 questions to earn a verifiable Distributed Systems Fundamentals certificate (SOA-DSF). Every question is based on published standards and research — including Designing Data-Intensive Applications (Martin Kleppmann (O'Reilly)), Site Reliability Engineering (Google), In Search of an Understandable Consensus Algorithm (Raft) (Diego Ongaro and John Ousterhout, USENIX ATC 2014) — and each answer is explained with its source.

Science of Apps offers a free Distributed Systems Fundamentals Certification, written for 2026 and 2027. It tests foundations, replication and consistency, consensus and coordination, partitioning and transactions and reliability in practice with 25 original scenario questions in all, each naming its published source; you get an instant score and a verifiable certificate with a credential ID you can add to LinkedIn.

Read the five skill areas on this page, then take the 25-minute test online — no fee, course or sign-up. You see every answer explained when you finish. Score 70% or more and you get a Distributed Systems Fundamentals certificate straight away, on screen, as a PDF and by email, with a credential ID anyone can verify.

Yes. The questions are original scenarios written by Science of Apps, and each one is based on a public source you can read: Designing Data-Intensive Applications (Martin Kleppmann (O'Reilly)); Site Reliability Engineering (Google); In Search of an Understandable Consensus Algorithm (Raft) (Diego Ongaro and John Ousterhout, USENIX ATC 2014); Time, Clocks, and the Ordering of Events in a Distributed System (Leslie Lamport, Communications of the ACM (1978)); Jepsen analyses and consistency models (Jepsen); Postmortem culture: learning from failure (Google SRE Book). The source is shown under each question and linked in the answer review. Science of Apps doesn't copy questions from other tests.

Five skill areas with five questions each, drawn from a bank of 10 per area so a retake brings new questions: Foundations (Failures and networks, Time and ordering and Fallacies); Replication and Consistency (Replication models, Consistency models and CAP and PACELC); Consensus and Coordination (Consensus algorithms, Leader election and Coordination services); Partitioning and Transactions (Sharding, Consistent hashing and Distributed transactions); Reliability in Practice (Retries and backoff, Load and overload and Observability and testing). Every question is an original scenario written to the 2026–2027 standard, with the published source named under it.

Backend or platform engineer, Site reliability or infrastructure engineer, Software architect, Database or storage engineer and Computer science student. It suits students at leading universities, career switchers and experienced professionals who want quick, verifiable proof of Distributed Systems Fundamentals knowledge in 2026 and 2027.

CS and AI students at MIT, Stanford, CMU, Berkeley, IITs, Tsinghua and ETH are hired on depth beyond tool use: model internals, systems and hardware. Passing earns a founder-signed Science of Apps certificate with a credential ID and QR code that recruiters can verify.

During a network partition, a distributed system must choose between consistency (every read sees the latest write) and availability (every request gets a response). Without partitions, both can be provided.

Raft is a consensus algorithm that lets a cluster agree on a replicated log despite node failures, using leader election, log replication and safety rules, designed to be easier to understand than Paxos.

Yes. The test is online, in English and free everywhere — people take it from India, the US, the UK, Europe, Africa, Latin America and Asia-Pacific. Your certificate is dated with your own local date and can be verified from anywhere at scienceofapps.com/certification/verify/.

25 questions — 5 from each of 5 skill areas — with a 25-minute limit. You need 70% (18 of 25) to pass and 90% for distinction.

We rate it Advanced: assumes years in the role or deep specialist knowledge. It has 25 scenario questions — 5 from each of 5 skill areas — and a 25-minute limit. You need 70% (18 of 25) to pass and 90% for distinction.

Nothing. There is no fee to take a test, to receive the certificate, to have it emailed or to verify it, and no sign-up.

On our server, not in your browser. The answers never reach the page until you submit, so a certificate can only be earned by passing. Each certificate gets a unique credential ID stored by Science of Apps.

You see your score for each area and every question with the correct answer and why, with the published source behind it. You can retake after 30 minutes, and the retake draws questions you haven't seen yet.

No. Every certificate is dated, so it always shows when you passed. Retake a test any time for a newer date or a higher score.

Yes. After you pass, Add to LinkedIn opens the Licenses & certifications form with the certificate name, Science of Apps as the issuer, the issue date, your credential ID and the verification link filled in. You can also download it as a PDF or PNG, and it's emailed to you as a PDF.

Every certificate has a credential ID and a QR code. Scanning it, or entering the ID at scienceofapps.com/certification/verify/, shows the holder's name, the certification, the score and the issue date from our records.

No. They are Science of Apps' own assessments of applied skill. They aren't issued by a university or standards body, and they work best alongside a portfolio that shows the skills in real work.