Karim Sakhibgareev, Software Developer in Porto, Portugal
Karim Sakhibgareev

Software Developer in Porto, Portugal

Member since August 22, 2016
Karim combines deep back-end development expertise using PHP and Node.js with a wide range of skills from front-end with React to DevOps with Docker, Kubernetes, and cloud providers, which enables him to build scalable, highly available, and fault-tolerant applications. With over 15 years of experience, passion for coding, and attention to details, Karim strives to exceed client expectations and deliver bug-free code within every deadline.
Karim is now available for hire




Porto, Portugal



Preferred Environment

Git, PhpStorm, MacOS

The most amazing...

...project I've worked on is a driving regulations training platform that had unique examples and useful tips for users.


  • Full-stack Developer

    2019 - 2020
    HeresMyInfo (via Toptal)
    • Worked on all aspects of the product, from the back and front end to the mobile application.
    • Created a front-end application from scratch with React, Redux, and Bootstrap.
    • Fixed the bugs and added new features to a React Native mobile application.
    • Developed a resilient and extensible Deeplink handling mechanism.
    • Implemented OAuth authentication and integrated it with the existing back-end authentication system.
    • Fixed bugs, handled security issues, and added new features to the Parse Server back-end API.
    Technologies: Google Cloud Platform (GCP), Express.js, OAuth, REST APIs, JavaScript, Docker, PostgreSQL, Parse, Node.js, Redux, React Native, React
  • Laravel Developer

    2017 - 2019
    Media.net (via Toptal)
    • Developed a next-generation highly automated SaaS platform in the adtech area.
    • Implemented a framework for fault-tolerant long-running async jobs. An async job can safely run for several days, gracefully recover after server restart and deployment, and continue from the same position where it was interrupted.
    • Led the team and made PR reviews. Spotted security breaches, performance issues, and potential runtime errors, and guided the code design in general. Reviewed over 400 PRs.
    • Designed and launched an inbound and outbound SMTP server with specific logic using Node.js.
    • Implemented multiple API endpoints and services with complex logic behind the API.
    • Created compound Elasticsearch queries and components to simplify communication with Elasticsearch.
    • Wrote unit, integration, and end-to-end tests, adopting several testing techniques across the team.
    • Sped up the running of unit test cases by up to 5x.
    Technologies: Amazon Web Services (AWS), Express.js, Test-driven Development (TDD), REST APIs, APIs, Supervisor, Beanstalkd, AWS SES, AWS, SMTP, JavaScript, MySQL, Elasticsearch, Node.js, Laravel, PHP
  • Symfony Developer

    2018 - 2018
    e-Hub Health (via Toptal)
    • Implemented a resilient report generation tool designed to handle any amount of records and fault-tolerant to work for several days.
    • Created an admin interface to work with report generation tasks, including scheduling, timezone adjustments, and report generation feedback, task pausing, ETA, and all other metrics.
    • Designed and launched an admin dashboard for live stats across different application subsystems. Fully flexible and adjustable for each user.
    Technologies: Amazon Web Services (AWS), Test-driven Development (TDD), Symfony 2, JavaScript, Supervisor, Amazon SQS, AWS, Symfony, PHP
  • Back-end Symfony Developer

    2016 - 2016
    IntoFilm (via Toptal)
    • Developed an API to integrate internal services with Salesforce using AWS SNS.
    • Created build and deploy plans along with AWS Elastic Beanstalk configurations.
    • Implemented a bunch of API resources for internal and public use, updated and refactored others, and fixed performance issues.
    • Built a PHP SDK for implemented API resources.
    • Worked in a team using Scrum methodology as well as participated in daily Scrum meetings and weekly planning meetings.
    • Created well-structured documentation in Confluence with schemes and diagrams.
    Technologies: Amazon Web Services (AWS), Test-driven Development (TDD), REST APIs, Ant, AWS Push Notification Service (AWS SNS), Amazon SQS, AWS, AWS Elastic Beanstalk, PHPUnit, PHP, Salesforce API, Symfony 2
  • CTO

    2014 - 2016
    Corpguru, LLC
    • Maintained the group of thematic sites with more than 10 million monthly users.
    • Created and implemented a cross-site registration and authentication system for the company’s projects.
    • Integrated unit and web tests.
    • Moved carsguru.net from PHP 5.2 to PHP 5.6, including deprecated libraries and dependencies (about 6500 changes in 150 files) and successfully launched it within six weeks to an operational site with over a million page views per day.
    • Led the project development from scratch—created an eCommerce solution with a single basket integrated with multiple online stores.
    • Integrated task tracker Redmine, CRM system, Git version control (and moved fifty projects there), Git workflow, and Scrum methodology.
    Technologies: OAuth, Test-driven Development (TDD), Symfony 2, JavaScript, Linux, Symfony, NGINX, MongoDB, Memcached, Sphinx Search Engine, MySQL, PHP
  • Senior PHP Developer

    2010 - 2014
    Corpguru, LLC
    • Developed and supported a group of thematic sites with more than 10 million monthly users.
    • Solved the high-load problem at onlineguru.ru, which had 1,000 RPS on the PHP back-end at peak.
    • Launched several new projects from scratch, including single login environment for free-to-play online games and gamers mmoguru.ru.
    • Developed and launched an advert targeting system for better rotation of clients’ banners on partners’ and our sites, which increased our profit up to 30%.
    • Integrated Sphinx Search in gameguru.ru and carsguru.net to increase page load speed.
    • Refactored key parts of projects with hundreds of thousands of daily users carsguru.net and onlineguru.ru.
    Technologies: OAuth, JavaScript, NGINX, Memcached, Sphinx Search Engine, MongoDB, Symfony, MySQL, PHP
  • Senior PHP Developer

    2009 - 2010
    iFLY – Loyalty SaaS
    • Designed and implemented a back-end solution for processing loyalty cards from scratch.
    • Integrated loyalty SaaS to several companies, including food delivery, taxi, pharmacy, and retailers.
    • Collected requirements for the loyalty system.
    • Updated a desktop C++ client application.
    • Developed the company site with a built-in online store for the clients.
    • Led the team of four developers.
    Technologies: C++, JavaScript, MySQL, PHP
  • C++ Developer

    2007 - 2008
    The Sea Code, LLC
    • Developed the MMORPG game with C++.
    • Designed a network protocol for client-server communication.
    • Implemented online fight system with a complex path search algorithm.
    • Finished the game up to the beta stage.
    Technologies: Guichan, TCP, C++
  • Developer

    2003 - 2007
    • Created a custom CMS system and used it for the digital design site with 500+ daily users.
    • Implemented and launched an eCommerce marketing service, which landed more than a hundred paying users.
    • Created a multisite catalog designed to be launched on hundreds of domains, defining the category by the domain.
    • Designed and implemented a mix of task tracker and CRM system for handling agency clients and employers.
    • Developed a car tire online shop.
    • Developed and launched climate systems online store.
    Technologies: CSS, HTML, JavaScript, MySQL, PHP


  • HeresMyInfo

    What business cards would have been if they were invented today. Contact sharing app for the mobile age.

  • ShareTask

    Service for smooth task sharing during a technical interview. Used by Toptal's screening team on a daily basis.

  • e-Hub Health

    Online mental health training

  • MMOGuru

    Single login environment for free-to-play online games and gamers.

  • CarsGuru Commercial Transport

    A catalog of commercial transport focused on flexible search. It supports various types of transport categories and builds pages structure using knowledge about items on sale.

  • PHP Frameworks: Choosing Between Symfony and Laravel (Publication)
    Many popular languages for web development have their 'default' framework, such as Ruby on Rails for Ruby, or Django for Python. However, PHP has no such single default and has multiple popular options to choose from. In this article, Toptal Freelance Developer Karim Sakhibgareev compares the two most popular PHP frameworks, Symfony and Laravel, explores their features, and establishes guidelines for how PHP developers should choose between them.


  • Languages

    ECMAScript (ES6), PHP 7, JavaScript, PHP, CSS, HTML, C++, TypeScript, GraphQL
  • Frameworks

    Laravel 5, Symfony 2, PHPUnit, Symfony 3, Laravel, Redux, Mockery, Jest, Bootstrap, Express.js, Koa, Symfony, OAuth 2, React Native
  • Libraries/APIs

    React, Node.js, REST APIs, React Router, jQuery, Socket.IO, Guichan, PubNub, Salesforce API, Google Analytics API, Facebook API, Vue
  • Tools

    Redmine, PhpStorm, Amazon SQS, AWS Push Notification Service (AWS SNS), XHProf, NGINX, Slack, Git, Xdebug, Trello, Redux Thunk, GitLab CI/CD, AWS SES, Supervisor, Beanstalk, Ansible, Graylog, Zabbix, Jira, Confluence
  • Paradigms

    Model View Controller (MVC), Test-driven Development (TDD), Agile Software Development, Scrum, Agile, Microservices
  • Storage

    Sphinx Search Engine, Memcached, MySQL, Elasticsearch, Redis, MongoDB, NoSQL, PostgreSQL
  • Other

    Back-end, APIs, Freelance, Beanstalkd, SOLID Principles, WebDAV, GitFlow, Full-stack, OAuth, WebSockets, AWS, Ant, SMTP, TCP, Customer Relationship Management (CRM), Lean Development
  • Platforms

    Linux, Amazon Web Services (AWS), Docker, MacOS, Parse, AWS Elastic Beanstalk, Kubernetes, Google Cloud Platform (GCP)


  • University Degree (Specialist) in Mathematics and Computer Engineering
    2005 - 2010
    Ufa State Aviation Technical University - Ufa


  • Toptal React Academy - Certificate of Completion

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