DSA roadmap and staff-level prep
A prominent DSA roadmap thread lays out a day-by-day path from Big O basics through advanced graph and dynamic programming problems for interview readiness. A separate staff-level prep thread stresses that senior interviews focus less on hundreds of LeetCode problems and more on system scenarios like rollouts, deprecation and monitoring. (x.com) (x.com)
Data structures and algorithms work is still the front door for many software interviews, and one widely shared roadmap breaks that prep into daily steps from Big O notation to graph and dynamic programming patterns. (codechef.com) Big O notation is the shorthand interviewers use to ask how code scales as input grows, and the roadmap starts there before moving through arrays, strings, linked lists, stacks, queues, trees, graphs, heaps, bit manipulation and dynamic programming. CodeChef’s public roadmap lists those topics in sequence and says it includes more than 450 practice problems. (codechef.com) Other public study plans follow the same arc: Roadmap.sh’s 2026 guide is a step-by-step map for data structures and algorithms, while Coursera’s March 9, 2026 resource frames the subject as a staged path from beginner work to interview prep. (roadmap.sh) (coursera.org) For candidates with a few years of experience, the interview mix changes. Interviewing.io says mid-level and senior software engineers should expect system design rounds, and its guide says coding skill alone plays a smaller role in passing those interviews than many candidates assume. (interviewing.io 1) (interviewing.io 2) System design questions test how a candidate would build and operate software that stays up under real traffic. LeetCode’s system design materials describe the format as high-level and low-level design work, not just writing one optimal function on a whiteboard. (leetcode.com) That is where staff-level preparation diverges from a long list of coding drills. Public staff interview writeups on LeetCode describe loops that combine coding with leadership, architecture and project questions, including how candidates handled critical projects and moved between teams with minimal disruption. (leetcode.com) The operational topics in the thread — rollouts, deprecation and monitoring — map to work companies already document in production. Meta’s engineering site has published posts on canary-style safety checks, service-level objectives and test reliability, all examples of how senior engineers are judged on reducing risk after code ships. (engineering.fb.com 1) (engineering.fb.com 2) (engineering.fb.com 3) A rollout is the controlled release of a feature to a small group before everyone gets it; deprecation is the planned retirement of an old interface; monitoring is the system of alerts and measurements that shows whether a change is breaking production. Interviewing.io’s senior guide says candidates are evaluated on tradeoffs, reliability and scale, not just whether they can reach a correct endpoint. (interviewing.io 1) (interviewing.io 2) The split in advice reflects two hiring markets at once. Early-career candidates still need fluency in common coding patterns, but staff candidates are increasingly screened on whether they can design migrations, contain blast radius and explain what they would measure after launch. (codechef.com) (interviewing.io) (interviewing.io) Taken together, the two threads describe one ladder with different rungs: learn how to analyze code first, then learn how to ship systems that survive contact with users. (coursera.org) (interviewing.io)
