Step into the
Engineering
Simulator.
Build production-ready systems, debug live incidents, and collaborate in a simulated enterprise environment. The ultimate proving ground for top-tier engineers.
Everything you need to simulate real engineering.
Real Jira Tickets
Actual engineering tickets with acceptance criteria, PR rules, and branch naming conventions — the full production workflow.
Live CI/CD Validation
Push code, get results in under 100ms. GitHub Actions runs your tests in real-time.
4-Role Team Missions
Work with 2 Full Stack, 1 DevOps, and 1 QA engineer — like an actual sprint team.
Anti-LeetCode Design
No memorized algorithms. We grade on architecture decisions, code quality, and engineering judgment.
Structured Learning Paths
Follow role-based roadmaps: Backend, Frontend, DevOps, QA. Each milestone unlocks harder scenarios.
XP & Leaderboards
Earn XP for completed missions, streak days, and peer reviews. Ranked weekly.
Graded like production. Scored like an architect.
Every submission is evaluated across four dimensions that mirror real-world engineering standards — weighted to match how hiring managers actually grade work.
Code Quality
Readability, structure, maintainability. Static analysis on cyclomatic complexity, naming conventions, and SOLID adherence.
Security
OWASP Top 10 detection, secret scanning, input validation coverage. The same audit a production PR would get.
Performance
Big-O analysis, runtime benchmarks, memory profiling. Measured efficiency against reference implementations.
Accuracy
Hidden + visible test suites, edge-case coverage, output diffs. Correctness is the baseline, not the ceiling.
Real tickets. Real inbox. Real terminals.
Every challenge drops you into a full engineering envelope — the ticket, the context from product, the editor, and the CI feedback loop — so practice finally feels like work.
Auth middleware rejects valid sessions after token rotation
QA reported that users are being force-logged-out ~60 seconds after a password change. Rotation refreshes the session but the middleware still holds the old expiry. Fix and add a regression test covering the rotation path.
re: auth drop-outs after password reset
Need a fix today — the support queue is stacking up. CS says they’re down to reissuing sessions manually. Please prioritize over the dashboard ticket.
1,200+ free scenarios. No walls, no paywall.
Pull down a branch, solve it, push it. Every free challenge ships with real CI, hidden tests, and a pillar-scored review.
- Core
Fix the JWT Rotation Bug
Next.js · Auth
Security90 min - Core
Optimize the Slow Query
Postgres · Prisma
Performance60 min - Senior
Debug the Flaky CI Pipeline
GitHub Actions
DevOps120 min - Intro
Write a CLI Tool from Scratch
Node.js · Commander
Code Quality45 min - Senior
Ship a Webhook Delivery Service
Fastify · BullMQ
Reliability120 min - Core
Refactor a Legacy Controller
TypeScript
Code Quality75 min
Team up for the weekly sprint.
Four-role teams, one shipping window, one ranked leaderboard. Build a feature, fix an incident, ship by Sunday night — or watch another team claim the top spot.
Role-based learning paths. Built by seniors.
Pick a role, follow the path. Every roadmap chains scenarios into a progression that ends with a portfolio-ready capstone project.
Backend Fundamentals
REST, queues, databases, observability.
Full-Stack Engineering
Ship end-to-end features like a senior IC.
Site Reliability
Incident response, tracing, cost control.
Built a great challenge? Get paid for it.
Senior engineers author the hardest scenarios on MockStruct. When learners complete your challenge, you earn a cut — and a verified author rank.
Shashwat R. — Staff Engineer
Stop learning theory.
Start working a real job.
The Student
Theory-rich, but lacking real-world experience.
Career Switcher
Self-taught, unsure what professional teams expect.
The Upskiller
Job hunting and needing a portfolio that proves skill.
Forged in the Arena
From students landing their first roles to engineering managers screening candidates — the platform works.
MockStruct clicked for me in a way tutorials didn't. Pulling down a real branch and seeing the pipeline fail on my first push made everything real.
Aisha K.
CS Senior → Full Stack Engineer (Fintech)
I used it to prep for technicals. The CI/CD scenario round in my interview was exactly what MockStruct had me practice.
Marcus T.
Career Switcher → DevOps Engineer
We send MockStruct challenges for our first-round technicals now. It instantly filters out candidates who've only ever written isolated algorithms.
Priya N.
Engineering Manager (Series B SaaS)
Stop practicing.
Start shipping.
Every day you spend doing LeetCode is a day without real engineering reps. Enter MockStruct — free, no credit card, no catch.
Free tier is genuinely free. No card required.