60-Day Data Engineering Interview Prep Planner | SQL, Coding, System Design Tracker (PDF)

Stop prepping for data engineering interviews with scattered bookmarks and random problem lists.

This is a complete 60-day guided study system built specifically for data engineering interviews — part planner, part problem bank. Track your daily reps across SQL, coding, and system design, and work through 86 interview-style prompts with structured hints (never full solutions — this is practice, not a cheat sheet).

What's inside — 142 pages

Part 1 · The 60-day planning system (52 pages)
- 60-day goal setter with milestone mapping
- Weekly planning spreads (SQL / coding / system design blocks per day)
- SQL, coding, and system-design practice logs with difficulty + time tracking
- Spaced-repetition tracker and mistake log (revisit what you got wrong)
- Mock interview log, interview debrief, and STAR story bank
- Weekly review + retrospective pages, habit streak tracker, dashboard

Part 2 · The problem bank (90 pages)
- 60 SQL prompts across 6 topics — joins, window functions, CTEs, aggregation, date functions, subqueries. Every prompt includes a business question, the tables/columns involved (one consistent schema throughout), a difficulty rating (1–5), and a one-line hint.
- 16 coding prompts covering the patterns DE interviews actually test: two pointers, sliding window, hash maps, sorting/search, recursion, stacks/queues, trees, and basic DP.
- 10 system design scenarios — real DE-flavored prompts (streaming ETL, exactly-once ingestion, slowly changing dimensions, data quality monitoring, GDPR deletion, feature serving, and more), each with key requirements and areas to address.
- Every prompt gets its own page with ruled workspace and a "solved" checkbox.

Two design themes included
- Code Editor — dark-teal minimal, monospace headers, for the terminal-native
- Neutral Modern — warm gray + terracotta, clean and calm
- Both themes ship in the same download. Use one, or mix and match.

Format — read this before buying
- 8 PDF files: 2 themes × (US Letter + A4) × (printable + fillable)
- Printable: print at home or at a print shop, print pages as many times as you like
- Fillable: type directly into the PDFs on your tablet or computer (works in any PDF reader/app that supports form fields)
- Undated and reusable — start any day, reuse every interview cycle
- Instant download — no physical item will be shipped

How it works
1. Buy the listing and download your 8 PDFs instantly.
2. Print the pages you want, or open the fillable version on your device.
3. Follow the 60-day plan: daily reps from the problem bank, logged in your trackers.

What you need
- A PDF reader (free ones work fine). For the fillable version, any PDF app with form-field support.
- A printer if you want the paper version. Pages are designed for standard US Letter and A4 paper.

Terms
- Digital download only — no physical product.
- For personal use only. Please don't redistribute or resell the files.
- Due to the nature of digital products, refunds aren't available — but if a file is ever corrupted or incomplete, message me and I'll make it right.

A note on how this was made
This planner's study prompts, hints, and page layouts were drafted with the help of AI tools, then reviewed, corrected, and refined by the seller (a working data engineer) before release — including a full expert review pass that caught and fixed real errors in the problem bank. What you're buying is the reviewed, finished product.