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Experienced (15+ years) developer and friendly Ruby on Rails and React/Next.js/Redux Developer/Mentor (with passion for helping others learn) | ★ 3,590+ 5 ★ sessions/jobs. 8+ years on top of the Codementor Ranking ★ https://www.codementor.io/ruby-on-rails-experts I am a Senior Software Engineer from Toronto, currently working as a Ruby on Rails and React/Redux Developer at theScore Inc. I am passionate about helping and mentoring people, especially those who are new to web development and the programming world. I am specialized in explaining the core concepts of Ruby and Rails, Javascript, React, APIs and everything else along with the best practices. I focus on the learning experience of my students and make sure they get exactly what they want. I have excellent academic track records (Bachelor of Science in Computer Science and Masters in Computer Engineering from the University of Toronto) along with strong development and industry experience in Software Development and Web Development (15+ years coding experience in total). I have helped more than 700 individuals here at CodeMentor (with 3,590+ 5 ★ sessions) with their projects implementation, bug fixes, architecture advices, performance improvements etc. I have worked with a bunch of CEOs and CTOs of YC start-ups and helped them with their projects. Made long term relationships with many of them which I help in a regular basis today. I have helped a ton of bootcamp students here at CodeMentor and helped them build their web development career path and getting jobs after the completion of their bootcamp cohorts. Here at CodeMentor, I have helped people from all levels: From someone who is brand new to programming to 30+ years of experienced Senior Software Engineers, Product Managers and everyone in between. It's been an amazing journey here at CodeMentor for the last 8+ years! :-) I started programming and solving problems in 2006, at the age of 18. Since then, I wrote programs in a variety of programming languages such as C, C++, Java, PHP, Ruby, Python, Javascript, etc. These days, I use Ruby and Rails and React JS as my primary programming languages and frameworks. I can help with debugging your issues as well as refactoring your code according to the best practices and conventions out there. Helping people is my passion and motto in life. If you think I can help you in any way, please get in touch! Specialties: * Building scalable and performant backend APIs in Ruby on Rails (Active Model Serializer, GraphQL, Grape, Jbuilder, RABL, etc.) for android, iPhone or web applications. (For more than 12 million users). * Integration of backend APIs with Javascript frontend framework (ReactJS) using JSON Web Token (JWT). * Built highly scalable Push Notification System for theScore sports application (For ~10 million users). * Implemented instant player, team and news article search for the theScore and theScore eSports apps which have more than 6 million monthly active users using ElasticSearch and Rails. * Backend Ruby on Rails Development (With scaling, performance optimizations, database query optimizations, caching best practices, etc.). * Test Driven Development with clean code and best practices. * Web Scraping (Nokogiri, Mechanize) (Scrape data from anywhere on the internet!). * Reverse engineering complex APIs and web applications to write automated scripts to mimic and automate user behaviour and extract required data. * Explain concepts/solutions clearly and concisely according to the level of the client/student. (Helped over 700 people on CodeMentor with 3,590+ 5 ★ sessions) * Giving architecture advice for your application. Explain which tools/gems to use and why. * Setting up SSL certificates for Rails application (Nginx server) on AWS EC2 instance and securing your application. * Suggesting best practices and focusing on the best learning experience and long-term achievements. * Showing cool tips and tricks that I have learned over the past 15+ years (and still learning!) as a professional Ruby on Rails developer to be more productive and efficient at work. * Upgrading Ruby/Rails versions for your existing application. * Finding bottlenecks and Optimizing performance for your slow Rails applications. * I can help you to prepare for interviews for Ruby on Rails developer position, or any other Software Development position. I have successfully guided many developers who got their dream jobs after practicing coding interviews with me!

React NativeAWS (Amazon Web Services)RSpecHerokuJavaScriptReactAPIRubyRuby on RailsReverse EngineeringReduxSinatraWebpackElasticsearchMySQLPostgreSQLGitGraphQLOmniAuthStripe

Reach out anytime at david@objective.enterprises I am a React and TypeScript engineer with over 10 years experience. My specialties are absolute beginners, small businesses, and aspiring engineers. I have guided hundreds of students into their first development job. I provide full support to development job-seekers, from mock interviews to career coaching. I can help you fix bugs quickly and fully understand each part of the solution. I offer tutoring services including, bootcamp support, long-term mentoring, and a complete educational experience. I have directed teaching programs and led classroom instruction in fullstack development, professional strategies, and game development. I also started without a formal background in computer science. I know you can cross that gap in an engaging, accessible, and fun way. Everyone that wants to make great software should be able to. I can help you learn to make apps with the features you want and explain exactly how they work. If you want to become a professional software engineer or entrepreneur and are eager to gain the necessary knowledge, I would be honored to help you improve your understanding, code, or career. I can help you assemble and manage a team of developers or coach you through an individual project. I offer pair-programming, consulting, and architectural planning alongside direct management and training. I can help key contributors or entire teams deliver features and understand how their solutions work. I can guide decision makers through complicated technical challenges to confidently determine the best course of action.

React NativeExpress.jsFirebaseGame DesignGameChakra UINoSQLTypeScriptSocket.IOjQueryJavaScriptReactNode.js

I'm a full stack software engineer, freelance programmer, computer science educator and technical writer. I enjoy debugging, refactoring, application design, maintaining large projects, testing and teaching. I spend my free time answering questions on [Stack Overflow](https://stackoverflow.com/users/6243352/ggorlen). I hold a gold badge in JS and I'm among the highest-rated answerers in tags such as Python, Node.js, C, algorithms, recursion, web scraping, Puppeteer, Playwright, Cheerio, BeautifulSoup, regex, HTML, HTML5 canvas, turtle graphics, P5.js and Matter.js. I'm also active on [Code Review Stack Exchange](https://codereview.stackexchange.com/users/171065/ggorlen). Feel free to peek at a few of these reviews to get a sense of the insights I can offer your code. Other technologies I'm passionate about include React, Express, Flask, Git, Vim, SQLite, Postgres, CSS, Django, Ruby, Rails, PHP, Perl, jq, MIPS, Java, C++, C#, Go, Bash, AngularJS, Vue, ffmpeg, Pygame, Haskell, language tools and parsing libraries such as Antlr and Lark, userscripts and a variety of testing frameworks such as Jest, React Testing Library, Mocha, RSpec, unittest and dozens of others. I received a Master's degree in CS from Georgia Tech in 2021. As a mentor for students, I emphasize fundamentals, conceptual understanding, pattern recognition and strategic approaches to problems. I believe that expertise is built on continually finding knowledge gaps and filling them in. Rather than completing your exam or assignment for you, I will help you learn the skills necessary to complete it. For more info, see my [Codementor FAQ](https://ggorlen.glitch.me/codementor). I'm looking forward to hearing about your project!

React NativeRegexRefactorPlaywrightGitHubJavap5.jsC++PerlTechnical WritingPuppeteerPythonGitWeb ScrapingJavaScriptScratchNode.jsTestingDebuggingTest AutomationVimJestHTMLAlgorithmReactJSONAPIPHPCAssemblyRuby