Technical interviews in 2026 look very different from even a few years ago. Live coding in Google Docs has been replaced by collaborative IDE sessions, and algorithm trivia has given way to real-world problem solving. Here's how to succeed.
The Modern Technical Interview Format
Most UK tech companies now use a structured 3-4 stage technical interview process:
Stage 1: Technical Screen (45-60 minutes) - Pair programming on a realistic problem - Focus on communication and problem-solving approach - No trick questions — employers want to see how you think
Stage 2: Take-Home Assignment (4-6 hours) - Real-world scenario relevant to the role - Assess code quality, testing, and documentation - Best practice: treat it as production code
Stage 3: System Design (60 minutes) - Design a scalable system (e.g., URL shortener, messaging platform) - Discuss trade-offs, scalability, and reliability - Increasingly important for senior roles
Stage 4: Cultural / Technical Deep-Dive - Discussion of past projects in detail - Questions about team collaboration and conflict resolution - Opportunity to ask questions about engineering culture
Preparing for Live Coding Sessions
Practice on a Real IDE Companies use tools like CoderPad, HackerRank, or their own collaborative environments. Practice coding in unfamiliar IDEs so you're not fighting the tool during the interview.
Think Out Loud Your thought process matters more than getting to the perfect answer immediately. Explain: - Why you're choosing a particular data structure - What trade-offs you're considering - How you'd optimise if performance were critical
Write Tests First Many interviewers are impressed when candidates write tests before implementation. It demonstrates: - Understanding of requirements - Quality-first mindset - Familiarity with TDD practices
System Design Interview Strategy
Start With Requirements Always clarify: - Functional requirements (what does it do?) - Non-functional requirements (scale, latency, availability) - Constraints (budget, existing tech stack, timeline)
Draw the Diagram A clear architecture diagram is worth a thousand words. Include: - Client layer (web, mobile, API consumers) - Application layer (load balancers, app servers) - Data layer (databases, caches, message queues) - External services (third-party APIs, CDNs)
Discuss Trade-Offs There is no perfect design. Show you understand trade-offs: - **SQL vs NoSQL:** Consistency vs scalability - **Monolith vs Microservices:** Simplicity vs independence - **Synchronous vs Asynchronous:** Simplicity vs resilience
Common Mistakes to Avoid
1. Jumping into code immediately — Take time to understand the problem 2. Ignoring edge cases — Consider empty inputs, invalid data, scale limits 3. Not asking clarifying questions — Requirements are rarely complete 4. Over-engineering — Start simple, then add complexity if needed 5. Ignoring the human element — Communication skills are evaluated too
"The candidates who stand out are the ones who treat the interview as a collaboration, not an exam. They ask good questions, consider alternatives, and engage the interviewer in discussion." — Engineering Director, Manchester-based SaaS company
Resources for Preparation
- **LeetCode:** Focus on "Medium" difficulty problems
- **System Design Primer:** GitHub resource for system design fundamentals
- **Pramp:** Free mock interviews with peers
- **Company Engineering Blogs:** Understand their tech stack and challenges
