Sebastian Janisiewicz

Sebastian Janisiewicz

Warsaw
Open to Work

8,823

Total Points

Points are earned whenever you take an important action on Treehouse.
Learn more about when and how points are earned.

Skills & Experience

  • Spoken Languages

    • English

104 Achievements

  • Achievement

    JavaScript and the DOM

    Interactive Web Pages with JavaScript

    Achieved

    Apr 24, 2016

    JavaScript and the DOM
  • Achievement

    Creating a Password Confirmation Form

    jQuery Basics (2014)

    Achieved

    Apr 23, 2016

    Creating a Password Confirmation Form
  • Achievement

    AJAX and APIs

    AJAX Basics (retiring)

    Achieved

    Apr 23, 2016

    AJAX and APIs
  • Achievement

    jQuery and AJAX

    AJAX Basics (retiring)

    Achieved

    Apr 23, 2016

    jQuery and AJAX
  • Achievement

    Programming AJAX

    AJAX Basics (retiring)

    Achieved

    Apr 19, 2016

    Programming AJAX
  • Achievement

    AJAX Concepts

    AJAX Basics (retiring)

    Achieved

    Apr 19, 2016

    AJAX Concepts
  • Achievement

    Cleaning URLs with Rewrite Rules

    Enhancing a Simple PHP Application

    Achieved

    Apr 18, 2016

    Cleaning URLs with Rewrite Rules
  • Achievement

    Cleaning URLs with Subfolders

    Enhancing a Simple PHP Application

    Achieved

    Apr 18, 2016

    Cleaning URLs with Subfolders
  • Achievement

    Integrating Validation Errors

    Enhancing a Simple PHP Application

    Achieved

    Apr 18, 2016

    Integrating Validation Errors
  • Achievement

    Building a Layout with Flexbox

    CSS Flexbox Layout

    Achieved

    Apr 17, 2016

    Building a Layout with Flexbox
  • Achievement

    Introduction to jQuery

    jQuery Basics (2014)

    Achieved

    Apr 17, 2016

    Introduction to jQuery
  • Achievement

    JavaScript Functions

    JavaScript Basics (Retired)

    Achieved

    Apr 17, 2016

    JavaScript Functions
  • Achievement

    JavaScript Conditional Statements

    JavaScript Basics (Retired)

    Achieved

    Apr 17, 2016

    JavaScript Conditional Statements
  • Achievement

    JavaScript Numbers

    JavaScript Basics (Retired)

    Achieved

    Apr 17, 2016

    JavaScript Numbers
  • Achievement

    JavaScript Variables

    JavaScript Basics (Retired)

    Achieved

    Apr 17, 2016

    JavaScript Variables
  • Achievement

    Introducing JavaScript

    JavaScript Basics (Retired)

    Achieved

    Apr 17, 2016

    Introducing JavaScript
  • Achievement

    Flexbox Properties

    CSS Flexbox Layout

    Achieved

    Mar 2, 2016

    Flexbox Properties
  • Achievement

    Understanding Flexbox

    CSS Flexbox Layout

    Achieved

    Mar 2, 2016

    Understanding Flexbox
  • Achievement

    Getting Started with CSS Layout

    CSS Layout Basics

    Achieved

    Feb 29, 2016

    Getting Started with CSS Layout
  • Achievement

    Database Security

    PHP & Databases with PDO

    Achieved

    Feb 24, 2016

    Database Security
  • Achievement

    Queries & Results

    PHP & Databases with PDO

    Achieved

    Feb 23, 2016

    Queries & Results
  • Achievement

    Getting Started with PDO

    PHP & Databases with PDO

    Achieved

    Feb 22, 2016

    Getting Started with PDO
  • Achievement

    SQL Calculating, Aggregating and Other Functions

    Database Foundations

    Achieved

    Feb 22, 2016

    SQL Calculating, Aggregating and Other Functions
  • Achievement

    Securing and Maintaining a MySQL Database

    Database Foundations

    Achieved

    Feb 22, 2016

    Securing and Maintaining a MySQL Database
  • Achievement

    Joining Relational Data Between Tables in SQL

    Database Foundations

    Achieved

    Feb 21, 2016

    Joining Relational Data Between Tables in SQL
  • Achievement

    Manipulating Schema with SQL

    Database Foundations

    Achieved

    Feb 21, 2016

    Manipulating Schema with SQL
  • Achievement

    Creating Tables and Manipulating Data with SQL

    Database Foundations

    Achieved

    Feb 21, 2016

    Creating Tables and Manipulating Data with SQL
  • Achievement

    Reading Data from Databases with SQL

    Database Foundations

    Achieved

    Feb 21, 2016

    Reading Data from Databases with SQL
  • Achievement

    Installing MySQL Server and MySQL Workbench

    Database Foundations

    Achieved

    Feb 21, 2016

    Installing MySQL Server and MySQL Workbench
  • Achievement

    Website Basics

    Website Basics

    Achieved

    Feb 21, 2016

    Website Basics
  • Achievement

    Introduction to Data, Databases and SQL

    Database Foundations

    Achieved

    Feb 20, 2016

    Introduction to Data, Databases and SQL
  • Achievement

    Contact Forms & Mailers

    Building Websites with PHP

    Achieved

    Feb 20, 2016

    Contact Forms & Mailers
  • Achievement

    Slim and Templates

    Building Websites with PHP

    Achieved

    Feb 20, 2016

    Slim and Templates
  • Achievement

    Dependency Management

    Building Websites with PHP

    Achieved

    Feb 20, 2016

    Dependency Management
  • Achievement

    PHP Inheritance & Interfaces

    Object-Oriented PHP Basics (Retired)

    Achieved

    Feb 20, 2016

    PHP Inheritance & Interfaces
  • Achievement

    PHP Properties & Methods

    Object-Oriented PHP Basics (Retired)

    Achieved

    Feb 20, 2016

    PHP Properties & Methods
  • Achievement

    PHP Objects and Classes

    Object-Oriented PHP Basics (Retired)

    Achieved

    Feb 20, 2016

    PHP Objects and Classes
  • Achievement

    PHP Email Form Errors

    Build a Basic PHP Website (2018)

    Achieved

    Feb 20, 2016

    PHP Email Form Errors
  • Achievement

    PHP Email Forms

    Build a Basic PHP Website (2018)

    Achieved

    Feb 19, 2016

    PHP Email Forms
  • Achievement

    PHP Inventory

    Build a Basic PHP Website (2018)

    Achieved

    Feb 18, 2016

    PHP Inventory
  • Achievement

    PHP Includes

    Build a Basic PHP Website (2018)

    Achieved

    Feb 18, 2016

    PHP Includes
  • Achievement

    PHP Internal Functions

    PHP Functions

    Achieved

    Feb 17, 2016

    PHP Internal Functions
  • Achievement

    PHP Returns & Closures

    PHP Functions

    Achieved

    Feb 17, 2016

    PHP Returns & Closures
  • Achievement

    PHP Functions Basics

    PHP Functions

    Achieved

    Feb 16, 2016

    PHP Functions Basics
  • Achievement

    PHP Loops

    PHP Basics (Retired)

    Achieved

    Feb 16, 2016

    PHP Loops
  • Achievement

    PHP Conditionals

    PHP Basics (Retired)

    Achieved

    Feb 16, 2016

    PHP Conditionals
  • Achievement

    PHP Datatypes

    PHP Basics (Retired)

    Achieved

    Feb 16, 2016

    PHP Datatypes
  • Achievement

    PHP Data & Structure

    PHP Basics (Retired)

    Achieved

    Feb 16, 2016

    PHP Data & Structure
  • Achievement

    PHP Getting Started

    PHP Basics (Retired)

    Achieved

    Feb 16, 2016

    PHP Getting Started
  • Achievement

    Custom Post Types and Fields

    How to Make a Website with WordPress

    Achieved

    Feb 16, 2016

    Custom Post Types and Fields
  • Achievement

    Customizing WordPress Themes

    How to Make a Website with WordPress

    Achieved

    Feb 16, 2016

    Customizing WordPress Themes
  • Achievement

    WordPress Themes

    How to Make a Website with WordPress

    Achieved

    Feb 16, 2016

    WordPress Themes
  • Achievement

    Installing Wordpress

    How to Make a Website with WordPress

    Achieved

    Feb 16, 2016

    Installing Wordpress
  • Achievement

    Structuring Tables

    HTML Tables

    Achieved

    Feb 16, 2016

    Structuring Tables
  • Achievement

    Table Basics

    HTML Tables

    Achieved

    Feb 16, 2016

    Table Basics
  • Achievement

    Choosing Options

    HTML Forms

    Achieved

    Feb 16, 2016

    Choosing Options
  • Achievement

    Organizing Forms

    HTML Forms

    Achieved

    Feb 16, 2016

    Organizing Forms
  • Achievement

    Form Basics

    HTML Forms

    Achieved

    Feb 16, 2016

    Form Basics
  • Achievement

    Using the MVC Architecture with Spring

    Spring Basics

    Achieved

    Feb 15, 2016

    Using the MVC Architecture with Spring
  • Achievement

    Modeling, Storing, and Presenting Data with Spring

    Spring Basics

    Achieved

    Feb 15, 2016

    Modeling, Storing, and Presenting Data with Spring
  • Achievement

    Fundamental Concepts

    CSS Basics (2014)

    Achieved

    Feb 14, 2016

    Fundamental Concepts
  • Achievement

    Designing with the Latest Features

    CSS Basics (2014)

    Achieved

    Feb 14, 2016

    Designing with the Latest Features
  • Achievement

    Basic Layout

    CSS Basics (2014)

    Achieved

    Feb 14, 2016

    Basic Layout
  • Achievement

    The Box Model

    CSS Basics (2014)

    Achieved

    Feb 14, 2016

    The Box Model
  • Achievement

    Understanding Values and Units

    CSS Basics (2014)

    Achieved

    Feb 14, 2016

    Understanding Values and Units
  • Achievement

    Basic Selectors

    CSS Basics (2014)

    Achieved

    Feb 13, 2016

    Basic Selectors
  • Achievement

    Getting Started with CSS

    CSS Basics (2014)

    Achieved

    Feb 13, 2016

    Getting Started with CSS
  • Achievement

    Debugging HTML and CSS Problems

    How to Make a Website

    Achieved

    Feb 13, 2016

    Debugging HTML and CSS Problems
  • Achievement

    Sharing a Website

    How to Make a Website

    Achieved

    Feb 13, 2016

    Sharing a Website
  • Achievement

    Responsive Web Design and Testing

    How to Make a Website

    Achieved

    Feb 13, 2016

    Responsive Web Design and Testing
  • Achievement

    Adding Pages to a Website

    How to Make a Website

    Achieved

    Feb 13, 2016

    Adding Pages to a Website
  • Achievement

    Styling Web Pages and Navigation

    How to Make a Website

    Achieved

    Feb 13, 2016

    Styling Web Pages and Navigation
  • Achievement

    Customizing Colors and Fonts

    How to Make a Website

    Achieved

    Feb 13, 2016

    Customizing Colors and Fonts
  • Achievement

    CSS: Cascading Style Sheets

    How to Make a Website

    Achieved

    Feb 12, 2016

    CSS: Cascading Style Sheets
  • Achievement

    Creating HTML Content

    How to Make a Website

    Achieved

    Feb 12, 2016

    Creating HTML Content
  • Achievement

    HTML First

    How to Make a Website

    Achieved

    Feb 12, 2016

    HTML First
  • Achievement

    Beginning HTML and CSS

    How to Make a Website

    Achieved

    Feb 11, 2016

    Beginning HTML and CSS
  • Achievement

    Getting Data from a Database

    SQL Basics

    Achieved

    Feb 10, 2016

    Getting Data from a Database
  • Achievement

    Creating Spring Controllers and Thymeleaf Views

    Spring Basics

    Achieved

    Feb 1, 2016

    Creating Spring Controllers and Thymeleaf Views
  • Achievement

    Spring Components and Configuring Our App

    Spring Basics

    Achieved

    Feb 1, 2016

    Spring Components and Configuring Our App
  • Achievement

    Setting Up Your Local Environment for Spring Development

    Spring Basics

    Achieved

    Feb 1, 2016

    Setting Up Your Local Environment for Spring Development
  • Achievement

    Getting Started with Android

    Build a Simple Android App

    Achieved

    Jan 30, 2016

    Getting Started with Android
  • Achievement

    What to Test

    Unit Testing in Java

    Achieved

    Jan 26, 2016

    What to Test
  • Achievement

    How To Test

    Unit Testing in Java

    Achieved

    Jan 26, 2016

    How To Test
  • Achievement

    Why Test

    Unit Testing in Java

    Achieved

    Jan 25, 2016

    Why Test
  • Achievement

    Advanced Tooling

    Local Development Environments

    Achieved

    Jan 25, 2016

    Advanced Tooling
  • Achievement

    Efficiency!

    Java Data Structures

    Achieved

    Jan 9, 2016

    Efficiency!
  • Achievement

    Exploring the Java Collections Framework

    Java Data Structures

    Achieved

    Jan 8, 2016

    Exploring the Java Collections Framework
  • Achievement

    Organizing Data

    Java Data Structures

    Achieved

    Jan 7, 2016

    Organizing Data
  • Achievement

    Getting There

    Java Data Structures

    Achieved

    Jan 7, 2016

    Getting There
  • Achievement

    Delivering the MVP

    Java Objects (Retired)

    Achieved

    Jan 6, 2016

    Delivering the MVP
  • Achievement

    Creating the MVP

    Java Objects (Retired)

    Achieved

    Jan 6, 2016

    Creating the MVP
  • Achievement

    Harnessing the Power of Objects

    Java Objects (Retired)

    Achieved

    Jan 6, 2016

    Harnessing the Power of Objects
  • Achievement

    Meet Objects

    Java Objects (Retired)

    Achieved

    Jan 6, 2016

    Meet Objects
  • Achievement

    Perfecting the Prototype

    Java Basics

    Achieved

    Jan 6, 2016

    Perfecting the Prototype
  • Achievement

    Using your New Tools

    Java Basics

    Achieved

    Jan 6, 2016

    Using your New Tools
  • Achievement

    Getting Started with Java

    Java Basics

    Achieved

    Jan 6, 2016

    Getting Started with Java
  • Achievement

    Event Planning

    Build a JavaFX Application

    Achieved

    Jan 6, 2016

    Event Planning
  • Achievement

    Build a Pomodoro App

    Build a JavaFX Application

    Achieved

    Jan 5, 2016

    Build a Pomodoro App
  • Achievement

    Design a Better App

    Build a JavaFX Application

    Achieved

    Jan 5, 2016

    Design a Better App
  • Achievement

    Graphical User Interfaces

    Build a JavaFX Application

    Achieved

    Jan 4, 2016

    Graphical User Interfaces
  • Achievement

    IDE Exploration

    Local Development Environments

    Achieved

    Jan 4, 2016

    IDE Exploration
  • Achievement

    How it Works

    Local Development Environments

    Achieved

    Jan 4, 2016

    How it Works
  • Achievement

    Newbie

    Achieved

    Jan 4, 2016

    Newbie