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Moises Gamio

@MoisesGamio

Software Developer | Writer on https://nitter.cf/t.co/l0zfJRNVGr | Entrepreneur

 Berlin Germany
codersite.dev
Joined May 2020
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  • Followers546
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Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)Photo by Moises Gamio (@MoisesGamio)
Ace the interview. Then write code that your team can modify for years. Free tutorials: codersite.dev 📗 Software That Can Change: design for the next change codersite.dev/book/softwareD… 📘 The Code Interview: 48 Java questions, solved step by step codersite.dev/book/theCodeIn…
Practical Programming Tutorials for Real Projects and Coding Interviews

Practical Programming Tutorials for Real Projects and Coding Interviews

Step-by-step Java and Spring Boot tutorials with complete code, algorithms for coding interviews, clean software design, and free developer tools.

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There are more than 40 articles on this site. You don't need all of them. Pick the goal that fits you and read the articles in order: each one builds on the one before. codersite.dev/start-here/ #Programming
Start Here

Start Here

New to codersite.dev? Pick a reading path: ace the coding interview, build REST APIs with Spring Boot, or design better software. Each path lists the articles in the order to read them.

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Build a RESTful Web Service with Spring Boot, Gradle, and OpenAPI codersite.dev/gradle-buildin… #SpringBoot
Build a RESTful Web Service with Spring Boot, Gradle, and OpenAPI

Build a RESTful Web Service with Spring Boot, Gradle, and OpenAPI

This guide walks you through the process of creating a RESTful web service with Spring, Gradle and Openapi.

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Create the instructions file your AI coding agent reads at the start of every session: build commands, architecture rules and guardrails for Claude Code, Codex, Cursor, Copilot and Gemini CLI. codersite.dev/tools/claude-m… #Claude #Agents
CLAUDE.md and AGENTS.md Generator

CLAUDE.md and AGENTS.md Generator

Free generator for AGENTS.md, CLAUDE.md, GEMINI.md, Copilot instructions and Cursor rules. Pick your stack and architecture and get a clear instructions file for your AI coding agent.

codersite.dev
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Paste a JSON object or API response and get Java classes for Jackson: records, Lombok or classic POJOs. Nested objects, lists, dates and snake_case names are handled for you. codersite.dev/tools/json-to-… #JSON #Validator
JSON to Java POJO Converter

JSON to Java POJO Converter

Convert JSON to Java records, Lombok classes or POJOs online. Correct types for long IDs, dates and decimals, Jackson annotations for snake_case, and code that compiles.

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Create the instructions file your AI coding agent reads at the start of every session: build commands, architecture rules and guardrails for Claude Code, Codex, Cursor, Copilot and Gemini CLI codersite.dev/tools/claude-m… #Claude #LLM
CLAUDE.md and AGENTS.md Generator

CLAUDE.md and AGENTS.md Generator

Free generator for AGENTS.md, CLAUDE.md, GEMINI.md, Copilot instructions and Cursor rules. Pick your stack and architecture and get a clear instructions file for your AI coding agent.

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Working as a developer in Germany? 180+ German IT words with articles and translations, the ones you'll hear in meetings, tickets and code reviews. From 10+ years in Berlin. codersite.dev/german-vocabul… #LearnGerman #Developers
German IT Vocabulary for Software Developers Working in Germany

German IT Vocabulary for Software Developers Working in Germany

Over 180 German IT words with articles and English translations: software development, coding, meetings, security and databases. From more than ten years as a developer in Berlin.

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A fixed budget, a list of products, the most grams for your money. The greedy basket looks right and fails. Knapsack in Java with TDD: greedy, brute force, then dynamic programming codersite.dev/optimize-onlin… #Algorithms #Java
Knapsack Problem in Java: Fill a Shopping Basket on a Budget (Greedy vs Dynamic Programming)

Knapsack Problem in Java: Fill a Shopping Basket on a Budget (Greedy vs Dynamic Programming)

Solve the 0/1 knapsack problem in Java with test-driven development: why a greedy basket fails, a brute-force solution, and dynamic programming that finds the most grams for your budget.

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Turn a 20-line loop into 5 readable lines. And learn why final is not the same as immutable. Functional programming in Java, link in bio. #Java #FunctionalProgramming
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Software Design Principles: A Practical Guide to Building Software That Can Change gives working developers a clear, practical path from messy code to systems that are easy to understand, test, and evolve. codersite.dev/book/softwareD… #Softwaredesign
Software Design Principles

Software Design Principles

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"From O(n ) to O(n): Replace Nested Loops with a HashMap in Java" by @MoisesGamio #DEVCommunity dev.to/moisesgamio/from-on-t…
From O(n ) to O(n): Replace Nested Loops with a HashMap in Java

From O(n ) to O(n): Replace Nested Loops with a HashMap in Java

One endpoint in a B2B order system I worked on returned 1,000 orders, and it was slow. The database...

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If your code needs you to explain it, it isn't finished. 10 clean code rules, each with a before-and-after from production Java. Link in bio. #CleanCode #Java
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Play with code. Curiosity fuels craft. Don't forget the joy. — Sam Aaron & Lu Wilson #Programming #Creativity
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Switch to an AI Career in Germany: MSIT’s Funded Programs and a €500 Welcome Bonus codersite.dev/msit-ai-career… #AgenticAI #ArtificialIntelligence
Switch to an AI Career in Germany: MSIT’s Funded Programs and a €500 Welcome Bonus

Switch to an AI Career in Germany: MSIT’s Funded Programs and a €500 Welcome Bonus

MSIT offers 22 online programs in AI, software engineering, cybersecurity and data, in German or English, up to 100% funded with a Bildungsgutschein. What you learn, who qualifies, and how to get a...

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From O(n²) to O(n): Replace Nested Loops with a HashMap in Java codersite.dev/transform-list… #HashMap
From O(n²) to O(n): Replace Nested Loops with a HashMap in Java

From O(n²) to O(n): Replace Nested Loops with a HashMap in Java

A real REST API was slowed down by nested loops. Here’s how grouping a List into a HashMap by key turned 2,000,000 comparisons into about 3,000, with a classic loop and a one-line Java 8 version.

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Good design isn't about patterns. It's about how cheap the next change is. Software That Can Change: 371 pages, plain Java 17, 239 passing tests. Link in bio. #SoftwareDesign #CleanCode
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Build a RESTful Web Service with Spring Boot, Gradle, and OpenAPI codersite.dev/gradle-buildin… #SpringBoot
Build a RESTful Web Service with Spring Boot, Gradle, and OpenAPI

Build a RESTful Web Service with Spring Boot, Gradle, and OpenAPI

This guide walks you through the process of creating a RESTful web service with Spring, Gradle and Openapi.

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The Trade-offs Every Engineer Should Know Before Their Next Whiteboard Interview codersite.dev/system-design-… #aws #software
The Trade-offs Every Engineer Should Know Before Their Next Whiteboard Interview

The Trade-offs Every Engineer Should Know Before Their Next Whiteboard Interview

A field-guide summary of Chapter 1 of System Design on AWS by Jayanth Kumar and Mandeep Singh — the concepts, fallacies, trade-offs, and guidelines that separate engineers who can code from engineers...

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Five principles. One running Java example. The difference between a codebase you extend and one you rewrite. The SOLID guide is on codersite, link in bio. #SOLID #SoftwareDesign
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Big O Notation in Java: Time and Space Complexity for Coding Interviews codersite.dev/big-o-notation… #Algorithms #Java

Big O Notation in Java: Time and Space Complexity for Coding Interviews

Learn Big O notation with tested Java examples: O(1) to O(n!), how to count steps, space complexity, the Big O of Java collections, and a timing experiment that shows growth rates.

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