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SOLID Principles Poster | Clean Code OOP Design Cheat Sheet (Digital Download)

Sławek Plamowski

Designed by Sławek

FlipCardsStudio ·

Wroclaw, Poland

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Highlights

⚡ INSTANT DIGITAL DOWNLOAD — this is a printable PDF file (not a physical poster). Print it yourself at home, at a copy shop, or order a print online.

Everyone can spell out the acronym. Fewer people can spot a Dependency Inversion violation in fifteen seconds of someone else's code, or explain — correctly — why DIP and Dependency Injection aren't the same thing. This poster is built around the part that actually gets tested: recognizing the smell, not reciting the definition.

WHAT YOU GET (instant download):
- One dense A2 poster design, delivered in 5 print-ready sizes: A2, A3, A4, US Letter, 18x24"
- Light, print-friendly theme with high-contrast typography — won't drain your ink cartridge, still sharp and readable across a room
- Vector PDFs — no pixelation at any print size

WHAT'S ON IT:
All five principles — Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion — each with its definition, the code smell that signals a violation, and a real before/after refactor snippet. Plus the parts most cheat sheets skip: DIP vs. Dependency Injection (a design principle vs. a technique — not the same thing), OCP vs. LSP (how they work together), a SOLID to design patterns map (which GoF patterns actually realize which principle), overcorrection traps (yes, you can over-apply SOLID), a code review checklist, and common interview questions with what a strong answer sounds like.

WHO IT'S FOR:
- Developers prepping for system design, architecture, or code-quality interview rounds
- CS students moving past textbook definitions into "can I spot this in real code"
- Anyone who wants the distinctions (DIP vs. DI, OCP vs. LSP) clarified once and for all
- Software engineers who want a genuinely useful (and good-looking) poster for their desk

WHY THIS POSTER:
Written by a senior software engineer — every code example traced through to confirm it actually demonstrates what it claims to, not AI slop with a plausible-looking snippet that doesn't hold up. Dense enough to teach you something new, clean enough to look good framed.

HOW IT WORKS:
Purchase → instant download of a ZIP with all 5 PDF sizes → print at home, at a copy shop, or order a poster print online → pick the size that fits your wall, binder, or frame.

Digital product — no physical item shipped. Personal use license.
Questions, or spot something you think is wrong? Message me — I answer daily and correct the file for everyone.

FlipCards Studio — study prints that don't waste your wall space.

Instant Download

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Listed on Aug 17, 2026
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