The Interview Loop, Stage by Stage

Before you draft a single answer, hold the whole shape in your head. The Software Engineer, Infrastructure loop at Cursor runs the standard engineering stages, then ends on something most companies don't do at all: a two-day on-site project where you build alongside the team and present at the end.

Read the loop as one continuous claim that you can operate the foundation under a product serving 1M+ daily active users - cloud, networking, Kubernetes, edge and cost - as a functioning senior IC from week one. Each stage tests a slice of that claim. Two stages are unusual at Cursor: the first technical screens forbid AI beyond editor autocomplete and the final round is a real build with the team rather than a whiteboard.

1. 1Recruiter screen (~30 min). Background, why Cursor, why infrastructure and which part of the stack pulls you. Fit and signal-gathering.
2. 2Technical phone screen (~60 min). One medium-hard coding problem with no AI except autocomplete, in TypeScript, Go, Rust or Python.
3. 3Take-home (~4-8 hrs, often senior/staff). A realistic infra or systems problem meant to give meaningful signal on how you actually engineer.
4. 4On-site technical rounds. A coding round, an infrastructure system-design round and a deep-dive on your past infra work.
5. 5Behavioral / hiring-manager round. Bar-awareness, comfort with pace, craft orientation and truth-seeking.
6. 62-day on-site project. The decision round: build something real with the team, share meals and present at the end.

Cursor runs roughly a four-to-five stage loop, with the on-site project as the decisive round rather than a formality. Plan your energy across the full span. The two-day project alone is a serious time commitment, so don't stack it on top of a crunch at your current job.

The recruiter screen runs about 30 minutes and sorts for two things: a specific reason you want this infrastructure role and evidence that you actually use and care about Cursor. It's informal, but the non-generic candidates are the ones who advance.

Expect questions on your background, why Cursor, why infrastructure and which part of the stack interests you. The trap is answering at the altitude of every other candidate. "I like scale" and "I want to work on hard problems" tell the recruiter nothing - anchor to a layer and a reason.

Cursor is a small, flat, talent-dense team where every hire ships from week one. The recruiter is partly reading whether you're calibrated to that pace and whether your motivation will survive contact with the actual work.

• Have your 90-second at-scale infra story rehearsed out loud, with the metric and how you measured it.
• Be ready to name the specific infra layer you want and why it fits your strengths.
• Bring one honest question about the infra roadmap or team shape - it signals you're evaluating them too.

This is the screen people underprepare for. About 60 minutes, one medium-hard problem and no AI beyond editor autocomplete. As CEO Michael Truell put it, "programming without AI is still a really great time-boxed test for skill and intelligence."

If you've spent the last year letting an agent draft your loops and your data structures, this screen will expose it. The fix is mechanical: practice fundamentals cold until graphs, trees and concurrency come out of your hands without a model in the loop. Languages are commonly TypeScript, Go, Rust or Python - pick the one you're fastest in, not the one that looks impressive.

Expect classic algorithm problems, sometimes with an infra or systems flavor. A rate limiter, a dependency graph, a scheduler or a log-merge are all fair game and play to your domain.

1. 1Clarify first. Restate the problem, ask about input size and constraints and name your assumptions before typing.
2. 2State the approach. Say the algorithm and its complexity out loud, so the interviewer can redirect you early if needed.
3. 3Write clean code. Real names, small functions, no dead branches - they're grading craft, not just correctness.
4. 4Test it yourself. Walk a small input by hand and probe the edges, since there's no AI to catch your off-by-one.
5. 5Narrate tradeoffs. Mention the alternative you didn't pick and why; that reasoning is half the signal.

type Bucket = { tokens: number; last: number };

function makeLimiter(ratePerSec: number, burst: number) {
  const buckets = new Map<string, Bucket>();
  return function allow(key: string, now = Date.now()): boolean {
    const b = buckets.get(key) ?? { tokens: burst, last: now };
    const refill = ((now - b.last) / 1000) * ratePerSec;
    b.tokens = Math.min(burst, b.tokens + refill);
    b.last = now;
    if (b.tokens < 1) { buckets.set(key, b); return false; }
    b.tokens -= 1;
    buckets.set(key, b);
    return true;
  };
}

Senior and staff candidates may get a take-home of roughly 4-8 hours, built to give meaningful signal on how you engineer for real. The on-site technical block then adds a coding round, an infrastructure system-design round and a deep-dive on your past infra work.

The take-home is a realistic infra or systems problem, not a puzzle. Treat the deliverable like production code, because that's what's being graded. The thing that separates a strong submission isn't cleverness; it's the README, the tests and the honest notes on what you'd do with more time.

One shift to expect: later rounds may allow open use of Cursor or other AI tools. That's not a relaxation - it raises the bar on judgment. Cursor wants to see you drive AI well, scope a prompt, verify output and reject a bad suggestion, because that's how the team actually works.

1. 1Read the brief twice. Note what's explicit, what's implied and what you'll assume - then write those assumptions down.
2. 2Make it reproducible. A clean setup that runs in one command beats a fancier solution a reviewer can't start.
3. 3Test the risky parts. You don't need 100% coverage; you need tests where a bug would actually hurt.
4. 4Write the tradeoff note. Say what you'd cut, what you'd harden and the cost/reliability calls you made.
5. 5Cut scope visibly. Shipping a smaller, solid thing with a clear "here's what's next" beats a sprawling half-build.

This is the round that decides. Shortlisted candidates spend roughly two days at the office building something real alongside the team, sharing meals and presenting at the end. It exists to filter out people "just viewing it as a job" from people who genuinely want to build this.

You're not being graded on a finished masterpiece. You're being graded on how you work: how you scope ambiguity, the questions you ask, how you ship increments and how clearly you communicate the tradeoffs you made along the way. Solo heroics that ignore the people around you are a failure mode here, not a flex.

1. 1Arrive rested. Two days of building plus social time is taxing; treat sleep and pacing as part of prep.
2. 2Ramp fast on the codebase. Spend the first stretch reading structure and conventions before you write much, then match the house style.
3. 3Pick a demoable slice. Choose the smallest thing that proves the idea, ship it and expand from a working core.
4. 4Show your work. Talk through decisions as you go and pull teammates in; they're evaluating collaboration, not isolation.
5. 5Land the presentation. Close with what you built, the tradeoffs you made and what you'd do next - clearly and honestly.

The hiring-manager round reads for whether you'll thrive on a small, flat, high-bar team. The themes are bar-awareness, comfort with a fast pace, craft orientation and your honest views on team quality. Bring stories, not adjectives.

Prepare four to six STAR stories that map to the infra work and the values. Aim for range: an incident you handled calmly, a hard cost-versus-reliability tradeoff, a migration or platform-unification you drove and a technical disagreement you resolved. One of those stories should be a time you were wrong and changed course on evidence.

Cursor screens hard for truth-seeking, so the "I was wrong" story carries real weight. The strongest version names what you believed, the evidence that contradicted it and what you did differently - without softening the fact that you'd been wrong.

• Use "I" for the decisions and the shipping; reserve "we" for genuine team facts.
• Quantify outcomes - a p99 number, a cost delta, an error-budget figure - wherever you honestly can.
• Be candid about the pace: Cursor runs intense and false enthusiasm is easy to read.