Tech Interview Formats Summarised

Technical interviews for engineering jobs usually sort into three buckets: coding with data structures, system design, and a deep walk-through of a past project. (x.com) A post by Gaurav Sarma, whose website links his X account @sarmag77, laid out that framework and said candidates should prepare for each format differently. Sarma’s thread pointed to data structures and algorithms for coding rounds, architecture trade-offs for design rounds, and detailed ownership stories for project deep dives. (gsarma.com, x.com) The same post said the template travels beyond enterprise software companies such as VMware and can be adapted to aerospace and defense employers including Boeing, SpaceX and Lockheed Martin, where interviews often probe system behavior, interfaces and failure modes. Boeing says its systems engineers work across architecture, requirements, integration, verification and validation, while SpaceX says software interns and engineers work on design, development, testing and manufacturing tied to flight hardware. (x.com, boeing.com, spacex.com) A data-structures round is the classic timed coding screen: arrays, trees, graphs, hash maps and the logic for turning a problem into working code. VMware interview guides published by interview-prep sites describe those rounds alongside recruiter screens and system design interviews. (techprep.app, codinginterview.com) A system design round asks a candidate to sketch how a service or platform would work at scale, then defend trade-offs on reliability, latency, storage and failure recovery. VMware-focused prep material describes these interviews as tests of control-plane thinking for physical infrastructure, including state management, isolation and long-running orchestration. (educative.io, techinterviewhandbook.org) A project deep dive is closer to an engineering design review than a puzzle. Candidates are expected to explain the problem, their exact role, the architecture, the hardest constraint, what broke, and what they would change now. (playbooks.lgtm.fyi, medium.com) That format lines up with how aerospace and defense companies describe the work itself. Boeing advertises systems roles spanning model-based systems engineering, integration and test, and Lockheed Martin’s interview guide says candidates should be ready to discuss past experience, technical skills and how they solve problems in teams. (boeing.com, lockheedmartin.com) Lockheed Martin’s hiring pages also tell applicants to study the job description, review their resume and prepare concrete examples before interviews. That advice fits the project-deep-dive approach, where vague claims are less useful than one specific system you can explain end to end. (lockheedmartin.com, lockheedmartin.com) The throughline in Sarma’s post was not that algorithms do not matter, but that many engineering roles reward candidates who can show ownership, communicate trade-offs and understand how one subsystem affects another. For jobs tied to aircraft, spacecraft, cloud infrastructure or defense platforms, that is often the difference between solving a whiteboard problem and proving you can ship a real system. (x.com, boeing.com, spacex.com, lockheedmartin.com)