The Data & AI Engineering questions you'll actually get asked — each with the answer, the code, and the diagram. Free kit, straight to your inbox · no card · studies offline.
Instant Databricks + AI interview kit · diagrams, code, real questions · free · plus early access at launch.
139 tracks · 68 roles · 7,500+ cards · 0 AI calls while you study
✦ The first 1,000 members get Pro free for a year
Every card is a rep at thinking — and talking — like the engineer they want to hire. Watch it play itself — or tap the phone and take over →
"Your nightly Spark job doubled in runtime" — not "define a DAG".
Tap the bug, infer the cause, fix it, verify. The on-call loop, drilled.
Miss a card? It re-queues until you own it. Honest SRS — no mercy hearts.
The small table ships to every executor, so the big side never moves across the network. Sort-merge shuffles both sides — that's the cost you're dodging. Watch for OOM if the "small" side isn't.
Auto-demo below — in the app you paste your own JD, and it maps to tracks you can drill today, flagging the gaps you couldn't see.
We're hiring a Senior Data Engineer to own our Snowflake warehouse and dbt models, orchestrated in Airflow. Expert SQL and Python; strong data modeling for finance reporting, running reliably on AWS.
ByteShards is built on the two things that actually move senior interviews.
Cards drill the production diagnosis loop — not trivia. You inspect real symptoms, infer the cause, fix it, and verify. Out loud, if you dare.
Scenario cards, evidence cards ("tap the tell"), buggy code panels, and an on-device judge that runs your SQL, Python & PySpark — offline, zero AI calls.
Interviewers ask about what shipped last month. Pro streams hand-verified cards on new Claude, OpenAI & AWS features — dated, source-linked, retired when stale. Delivered as content updates — the app itself never runs AI.
Claude Code ships /loop — what changes for agent scheduling?
S3 Express One Zone pricing drop — when does it beat standard?
Structured outputs vs JSON mode — what would you use in prod?
Run SQL, Python & PySpark drills against expected output — fully offline, zero AI calls, zero latency.
Walk real production incidents — broken pipelines, hot partitions — and narrate the fix like on-call.
Set the date. Get a 21-day plan that ramps intensity toward it, then tapers to a warm-up.
Paste a job description — see exactly which tracks it maps to and where your gaps are.
Timed mocks with scoring, plus voice sessions that check your answer hits the key points.
Daily quests, weekly leagues, combo bonuses. Pro adds streak insurance — 🧊 3 freezes a month.
Curated decks shaped to specific companies' stacks — free shows the top two, Pro opens the vault.
Export a readiness report and a tailored cheat sheet the night before. Walk in calm.
Real screens, captured from the app · drag for more →
From core SQL to vendor AI platforms — filtered to your role and level, so you never study noise.
Choose a role and every session filters to the exact tools that role interviews for — junior to principal.
…and more — 70+ roles in the app, each with 5 levels and its own track mix.
14 tools across Data Engineering, AI Engineering and Core Skills — each with Junior, Mid and Senior answers, the Interviewer's Lens and red/green-zone cues. All bundled in the app.
You only ever pay for freshness and depth — weekly drops of new interview questions, incidents, mocks, unlimited everything. Never the basics.
| What you get | Free | Pro |
|---|---|---|
| Every track, every answer, full library110+ tracks · 70+ roles · all 5 levels | ✓ | ✓ |
| Daily review sessionsspaced repetition, scenarios, flip cards | 15-card | 40-card |
| Code judge runsSQL · Python · PySpark, on-device | 3 / day | Unlimited |
| Weekly fresh streamwhat shipped in Claude / OpenAI / AWS | 3-card taste | Full stream |
| Custom decks (My Tracks) | 1 deck · 20 cards | Unlimited |
| Interview Autopilot21-day interview-date-aware plan | Today only | Full plan |
| Incident debugging | — | ✓ |
| Mock + voice interviews | — | ✓ |
| JD analyzer | Top-3 teaser | Full + apply |
| Streak insurance🧊 +3 freezes/mo · 1-tap repair | — | ✓ |
| Cheat-sheet & readiness PDFs | — | ✓ |
You can — they're great at what they're for. Here's what they're not for.
| ByteShards | LeetCode | Anki | |
|---|---|---|---|
| Production scenarios & talk-tracks"your Spark job doubled in runtime — go" | ✓ | — | — |
| DSA / algorithm puzzleswhere LeetCode genuinely wins | — | ✓ | — |
| Senior data/AI content built-in110+ tracks, hand-verified | ✓ | some | you author it |
| Spaced repetition | ✓ | — | ✓ |
| Code judgeSQL · Python · PySpark | on-device, offline | online only | — |
| Weekly "what shipped" cardsClaude / OpenAI / AWS | ✓ Pro | — | — |
| Streaks, quests & leagues | ✓ | streaks | — |
| Price | Free · $29.99/yr Pro | ~$35/mo Premium | Free |
Grinding algorithms for a FAANG SWE loop? Use LeetCode — seriously. ByteShards is for the data & AI systems interview.
Tailors your resume to every contract role (C2C / C2H) and lines up a recruiter-ready draft for each — so you stop rewriting your resume one job at a time.
100+ tailored applications in under an hour · you review and send · runs on your machine, your data stays with you
Needs a Claude Code subscription · early access, invited in batches · See how it works →
Core free forever · studies offline · no account needed.
Instant Databricks + AI interview kit · diagrams, code, real questions · free · plus early access at launch.
139 tracks · 68 roles · 7,500+ cards · 0 AI calls while you study
✦ The first 1,000 members get Pro free for a year
📱 Coming soon · App Store🤖 Coming soon · Google Play