
Blockchain Job Interview Warm‑Up: 30 Real Coding & System‑Design Questions
Blockchain technology has evolved from a niche concept powering cryptocurrency to a full-fledged framework for decentralised applications across multiple industries. From smart contracts and decentralised finance (DeFi) to supply chain management and digital identity systems, blockchain is reinventing how we transact and interact in the digital world. As a result, blockchain developers, architects, and entrepreneurs are in high demand. If you’re aiming to secure a blockchain‑related role—whether at a cutting-edge start-up, a multinational tech firm, or a forward‑thinking consultancy—chances are you’ll face a rigorous, multifaceted interview process. Beyond classic coding tasks, recruiters often delve into distributed systems, cryptographic principles, consensus algorithms, and smart contract security to evaluate your technical prowess and problem-solving skills. In this article, we’ll explore 30 real coding & system-design questions you might encounter on your blockchain job interview. We’ll also discuss why proper preparation is crucial, and how you can stand out from the competition by showcasing both your technical and conceptual understanding. For a curated selection of the latest blockchain job vacancies, head over to www.blockchainjobs.uk. There, you’ll find roles across the UK that span development, architecture, project management, and more. Let’s dive right in so you can approach your next blockchain interview with confidence.