Where Do I Start? An introduction to software development from the very beginning By @tuttiq 

● Tutti Quintella (@tuttiq online) ● From São Paulo, Brazil ● Major in Computer Engineering ● Software Engineer since 2011 ● Main experience with web & mobile development ● Like dancing, cooking and going out/socializing (not all developers are introverts!) Who am I? 

● What's a software or app? Can I run software anywhere? ● What are operating systems or platforms? ● What are the types of software? What can be done with software development? ● What are programming languages? What types are there? ● How is code transformed into applications? First things first 

Refreshing basic concepts 

Basic concepts ● Computer: any electronic device that has a processor (laptops, smartphones, smartwatches, smart tvs, servers, micro-computers…) ● Software: the programs that run in a computer ● App: software application. Software designed to perform a specific function directly for the user or, in some cases, for another application. 

Basic concepts In other words: software or apps are a bunch of text files with instructions that a computer can understand and execute. 

Basic concepts ● Operating system: the base software that supports a computer's basic functions, like managing hardware resources and software applications. Ex: managing information on the memory, managing peripherals, installing and running apps. ● Platform: a major piece of software. Ex: operating systems. 

What are the types of software? What can be done with software development? 

Web Apps / Games (software you access from a browser) ● Web pages built with HTML, CSS and Javascript ● Examples: Amazon, Gmail, Google Docs, web games Types of software: App / Games 

Mobile Apps / Games (software you run on a phone or tablet) ● Android, iOS ● Examples: Mercari, Line, Instagram, mobile games Types of software: App / Games 

PC Apps / Games (software you run on a personal computer) ● Windows / Linux / MacOS ● Examples: Microsoft Office, Skype, Photoshop, PC games Types of software: App / Games 

Game Console Apps / Games (software you run on a game console) ● XBox, PlayStation, Nintendo Wii, etc… ● Examples: Netflix for XBox, any console game Types of software: App / Games 

Other devices ● ATMs, SmartTVs, Smart Watches, micro-computers… ● Examples: ATM Bank system, Apple Watch apps, IoT, etc... Types of software: App / Games 

● Infrastructure (SRE) / DevOps ○ Windows / Linux Servers ○ Server configuration, performance monitor, continuous integration ● Data Analysis ○ Analyze big amounts of data and turn into meaningful information ○ SQL, R, Google BigQuery, TrasureData, Tableau ● Data Science / AI / Machine Learning ○ Algorithms and systems built to learn and adapt over data ○ Image recognition, NPL (Natural Language Processing), etc... Other types of engineering 

What are programming languages? What types are there? 

Programming languages ● Languages that computers can understand What time is it? ? 01010101011001 13:30 

Types of Programming languages 01001011 00010100 01101001 10001010 10110010 10000101 01010101 01010010 Low-level (Binary) movb $4, %al xor %ebx, %ebx inc %ebx movl $hello, %ecx let date = new Date(); let time = date.getHours(); return `The time is: ${time}` High-level (E.g. Javascript) Closer to human language Closer to machine language 

How is code transformed into applications? 

Human languages Raise your hand. Read + interpret Execute Language: English Person that can understand English 

Programming languages console.log ("Hello World") Read + interpret Execute Language: Javascript Interpreter that can understand Javascript 

Compiler / Interpreter 01001011 00010100 01101001 10001010 10110010 10000101 01010101 01010010 Low-level (Binary) movb $4, %al xor %ebx, %ebx inc %ebx movl $hello, %ecx let date = new Date(); let time = date.getHours(); return `The time is: ${time}` High-level (E.g. Javascript) High-level programming language Machine language COMPILATION / INTERPRETATION 

Wanna try an interpreter right now? ● Open Chrome browser in any tab + J + J Macbook Windows 

Type some code! 

So... text files! (that machines can understand) Software or apps are a bunch of text files with instructions that will be compiled or interpreted so a computer can understand and execute. 

Programming languages Libraries Frameworks 

Programming languages ● Just like human languages, there are many programming languages (Java, Ruby, Python, Javascript…) ● Just like human languages, programming languages also have their own syntax, vocabulary and semantics. Raise your hand . verb pronoun noun punctuation var date = new Date(); punctuation variable reserved word method or function operator 

Libraries ● Libraries are extensions of a programming language to add functionalities to it (like "add-on" packages or expansions you can install on a game, for example) + jQuery is a Javascript library that adds several utility functions to Javascript. 

Frameworks What is a framework? ● "A supporting structure around which something can be built" ● "A system of rules, ideas, or beliefs that is used to plan or decide something" ● Usually a big language extension, that provides standards and features that the programming language doesn't have by itself ● A big and opinionated library + + 

Language Frameworks/Libraries Go Echo, Chi, Gin C / C++ Wt, CppCMS... C# ASP.NET Perl Mojolicious, Catalyst... Scala Play Elixir Phoenix Languages and their popular extensions Language Frameworks/Libraries JavaScript jQuery, React, Angular, NodeJS... Java JSF, Spring, Android SDK... Swift FlourishUI, Perfect, ReactKit Ruby Rails, Sinatra... Python Django, Flask... PHP Laravel, CodeIgniter, Zend... 

● Templates, markup, key-value formats: HTML, XML, JSON, YAML ● Styling: CSS (Frameworks: Bootstrap, Material UI, Bulma…) Other languages and file formats 

What to consider when choosing a programming language or framework? 

Different types of application require different programming languages, frameworks and toolset. For example: ● Android app: Java or Kotlin + Android SDK ● iOS app: Objective C or Swift ● Web app: A million possibilities between back-end and front-end ● AI/Machine Learning: Most commonly Python + ML libraries/tools Don't remember all the possibilities? Go back to slide #8 Already know what you want to do? Google "tech stack for [X] development" to read about some common sets of programming language + frameworks + tools to get started 1. What do you want to do? 

A. Age of a language/framework a. Is it already obsolete due to new languages? b. Does it solve modern problems? c. How mature is it (how stable are updates and how complete is its documentation)? B. What's the learning curve like and how much effort/time do I want to spend learning it? C. Is it appropriate and useful for what I want to develop? a. Is it commonly used for similar purposes? b. Does it have libraries/helpers/tools that will help with it? D. Is it valuable in the market? a. Are many companies hiring to work with it? Are the jobs well paid? b. Is it a market trend? What are the reasons for the trend? c. Will it be valuable in the short/mid-term future? 2. Other things you can consider 

What else can you expect to learn if you want to become a Software Engineer? (This is an unnecessary look into more advanced stuff, skip this session if you don't want to feel confused/scared. Go ahead if you're feeling adventurous.) 

How do you make a bunch of text files work together? 

Structure of software apps Project structure: how you organize your files (usually following frameworks, design patterns, modules, etc) (don't worry about understanding any of this now, just know that this exists) 

Structure of software apps Data / Database structure: how do you organize the data your system needs (don't worry about understanding any of this now, just know that this exists) 

Structure of software apps Architecture: how do you organize your whole system (what pieces do you need, how do you break your system in major parts, including infrastructure, external modules, etc) (you're NOT supposed to understand any of this, just know that system architecture is a thing) 

Structure of software apps Infrastructure: how do you make your system available for your users (servers, data centers, cloud platforms, etc) 

Structure of software apps DevOps: how do you automate everything cause you're lazy (and humans executing repetitive tasks are more error-prone than scripts) 

How do you make a bunch of engineers writing a bunch of text files work together? 

Scaling software development ● SDLC: Software Development Life-Cycle ● Industry standards: guidelines and best practices well known among software developers ● Project management methodologies: agile, waterfall ● Collaboration techniques: pair programming, code review, documentation, etc 

If you're hungry for more ● Web Development 101 ○ Front-end, back-end, servers, clients, APIs, etc ● Scaling Software Development ○ Code organization, best practices, DevOps, team structures ● Refactoring Fat Components ○ Breaking down classes and modules the right way 

Questions? Thank you!