Maciej is available for hire
Hire MaciejMaciej Paprocki
Verified Expert in Engineering
Full-stack Developer
London, United Kingdom
Toptal member since August 23, 2022
Bio
Maciej is a full-stack developer with a background in mathematics and computer science. Throughout his career, he has led technical teams of various sizes and delivered everything from small websites to apps serving 50 million monthly users. He has supervised projects at all development stages, from design through architecture and implementation to user feedback. Maciej has developed close client relationships, helping scale their businesses, sometimes tenfold, with new technological solutions.
Portfolio
IF AND ONLY IF LTD
PHP, JavaScript, React, Node.js, WordPress, Symfony, Symfony 6, Webpack, Jest...
Worldfirst
PHP, Node.js, React, Cloudflare, Web UI, Web UX
Hardlyeverwornit
PHP, JavaScript, jQuery, Symfony, Sylius, Symfony 4, Symfony 5, Symfony 6, SCSS...
Experience
Availability
Part-time
Preferred Environment
PHP, Symfony, WordPress, React, JavaScript, Node.js, Back-end, Front-end, CakePHP
The most amazing...
...thing I've developed is a custom marketplace platform serving thousands of sellers and buyers daily.
Work Experience
Owner
2017 - PRESENT
IF AND ONLY IF LTD
- Sourced clients and managed the business, including contracts, billing, and payments.
- Built over 20 websites using WordPress, Symfony, Sylius, MySQL, React, SCSS, and APIs, setting up automatic deployments and code quality tools.
- Developed close relationships with clients over the years and helped scale their businesses, sometimes tenfold, by providing new technological solutions.
Technologies: PHP, JavaScript, React, Node.js, WordPress, Symfony, Symfony 6, Webpack, Jest, Advanced Custom Fields (ACF), Vagrant, Trellis, SCSS, Docker, Terraform, Encore, PHPUnit, Optimization, MySQL, Kubernetes, Puppeteer, HTML5, jQuery, Vanilla JS, Git, GitHub, Amazon RDS, APIs, Web Hosting, Hosting, Mobile, Software Architecture, Technical Leadership, eCommerce, Mobile Development, Startups, Scalability, Architecture, Planning, Agile, DevOps, Responsive Design, LAMP, Amazon Web Services (AWS), Tailwind CSS, Web Development, Full-stack, HTML, REST APIs, Subscriptions, Facebook API, WordPress Themes, WordPress Plugins, PHP Performance, Redis, Local Hosting, Cloud, PHP 7, SQL, Unit Testing, Object-oriented Programming (OOP), Zend Framework, Laminas, Full-stack Development, Team Leadership, Third-party APIs, Cron, Background Jobs, Back-end, Leadership, Google SEO, Front-end, Google Tag Manager, Google Analytics, Google Analytics 4, CakePHP, Linux, Apache, Technical Architecture, CTO, Project Management, Cloud Architecture, ESLint, Google Tag Manager API, Python, Feasibility, Feasibility Studies, A/B Testing, Landing Pages, UI Development, Contentful, AWS Lambda, Webhooks, Search Engine Optimization (SEO), Software Design, Technical Consulting, Software Implementation, Software Development Management, B2B, Engineering, Delivery Management, Engineering Management, People Management, Team Management, Agile Project Management, Software Troubleshooting, Project Scoping, Mentorship, CircleCI, Jenkins, Database Design, New Relic, Code Review, Estimations, API Integration, GraphQL, Lambda Functions, Excel 365, Product Management, User Experience (UX), User Interface (UI), Cloudflare, Web UI, Web UX
Team Lead
2022 - 2022
Worldfirst
- Developed the front end for the company's new greenfield project.
- Added test suits for existing projects, including unit and E2E tests.
- Developed new and improved CI/CD pipelines and moved the team to trunk development.
Technologies: PHP, Node.js, React, Cloudflare, Web UI, Web UX
CTO and Lead Developer
2020 - 2022
Hardlyeverwornit
- Redeveloped an old website and improved its UX and reliability.
- Built and managed a team of three back-end developers, a part-time DevOps programmer, a part-time designer, and a product owner.
- Achieved three times bigger stock acquisition by improving stock intake and user registration processes.
Technologies: PHP, JavaScript, jQuery, Symfony, Sylius, Symfony 4, Symfony 5, Symfony 6, SCSS, Docker, Webpack, Encore, PHPUnit, Optimization, MySQL, Kubernetes, Jest, Puppeteer, HTML5, Vanilla JS, PayPal API, PayPal, Git, GitHub, Amazon RDS, AWS Elastic Beanstalk, APIs, Behat, Web Hosting, Hosting, Mobile, Software Architecture, Technical Leadership, eCommerce, Mobile Development, Startups, Scalability, Architecture, Planning, Agile, DevOps, Responsive Design, LAMP, Amazon Web Services (AWS), Tailwind CSS, Web Development, Full-stack, HTML, REST APIs, Subscriptions, Facebook API, WordPress Themes, WordPress Plugins, PHP Performance, Redis, Local Hosting, Cloud, PHP 7, SQL, Unit Testing, Object-oriented Programming (OOP), Full-stack Development, Team Leadership, Third-party APIs, Cron, Background Jobs, Back-end, Leadership, Google SEO, Front-end, Google Tag Manager, Google Analytics, Google Analytics 4, Linux, Apache, Technical Architecture, CTO, Project Management, Cloud Architecture, ESLint, Google Tag Manager API, Python, Feasibility, Feasibility Studies, A/B Testing, Landing Pages, Django, UI Development, AWS Lambda, Webhooks, Search Engine Optimization (SEO), Software Design, Technical Consulting, Software Implementation, Software Development Management, B2B, Engineering, Delivery Management, Engineering Management, People Management, Team Management, Agile Project Management, Software Troubleshooting, Project Scoping, Mentorship, CircleCI, Database Design, New Relic, Code Review, Estimations, API Integration, GraphQL, Lambda Functions, Product Management, User Experience (UX), User Interface (UI), Cloudflare, Web UI, Web UX
Tech Lead
2019 - 2020
Culturetrip
- Designed and implemented the event-driven architecture for multiple teams.
- Moved the development to Docker, Kubernetes, and Terraform.
- Implemented testing tools and automated code quality checks.
- Developed a WordPress proxy service to drastically increase API reliability and response times.
Technologies: PHP, WordPress, React, Trellis, Ansible, Terraform, Symfony, Caching, Microservices, Docker, Cypress, Puppeteer, Advanced Custom Fields (ACF), Jest, SCSS, JavaScript, Webpack, PHPUnit, Optimization, MySQL, Kubernetes, Node.js, HTML5, jQuery, Vanilla JS, Git, GitHub, Amazon RDS, APIs, Web Hosting, Hosting, Mobile, Software Architecture, Technical Leadership, eCommerce, Mobile Development, Startups, Scalability, Architecture, Planning, Agile, DevOps, Responsive Design, LAMP, Amazon Web Services (AWS), Next.js, TypeScript, Web Development, Full-stack, HTML, REST APIs, Facebook API, WordPress Themes, WordPress Plugins, PHP Performance, Redis, Local Hosting, Cloud, PHP 7, SQL, Unit Testing, Object-oriented Programming (OOP), Full-stack Development, Team Leadership, Third-party APIs, Cron, Background Jobs, Back-end, Leadership, Google SEO, Front-end, Google Tag Manager, Google Analytics, Google Analytics 4, Linux, Apache, Technical Architecture, Project Management, Cloud Architecture, Google Tag Manager API, Feasibility, Feasibility Studies, A/B Testing, Landing Pages, UI Development, AWS Lambda, Webhooks, Express.js, Search Engine Optimization (SEO), Software Design, Technical Consulting, Software Implementation, Software Development Management, B2B, Engineering, Delivery Management, Engineering Management, People Management, Team Management, Agile Project Management, Software Troubleshooting, Project Scoping, Mentorship, CircleCI, Jenkins, Database Design, New Relic, Code Review, Estimations, API Integration, GraphQL, Lambda Functions, Finance, Product Management, User Experience (UX), User Interface (UI), Cloudflare, Web UI, Web UX
Lead Back-end Developer
2017 - 2017
Shortlist/Stylist Magazines
- Built an API in PHP and WordPress and provided documentation and front-end libraries to consume the API.
- Created automation for code quality, testing, and deployment.
- Implemented caching, prewarming, and invalidation tools to serve thousands of articles for multiple sites with minimal response times.
Technologies: PHP, WordPress, APIs, React, SCSS, Docker, JavaScript, Webpack, PHPUnit, Optimization, MySQL, Jest, Node.js, HTML5, jQuery, Vanilla JS, Git, GitHub, Amazon RDS, Behat, Selenium, Web Hosting, Hosting, Mobile, Software Architecture, Technical Leadership, Mobile Development, Scalability, Architecture, Planning, Agile, DevOps, Responsive Design, LAMP, Amazon Web Services (AWS), Web Development, Full-stack, HTML, REST APIs, Subscriptions, WordPress Themes, WordPress Plugins, PHP Performance, Redis, Local Hosting, Cloud, PHP 7, SQL, Unit Testing, Object-oriented Programming (OOP), Full-stack Development, Team Leadership, Third-party APIs, Cron, Background Jobs, Back-end, Leadership, Google SEO, Front-end, Google Tag Manager, Google Analytics, Google Analytics 4, Linux, Apache, Project Management, Cloud Architecture, ESLint, Google Tag Manager API, Feasibility, Feasibility Studies, Landing Pages, UI Development, Webhooks, Search Engine Optimization (SEO), Software Design, Technical Consulting, Software Development Management, B2B, Engineering, Delivery Management, Engineering Management, People Management, Team Management, Agile Project Management, Software Troubleshooting, Project Scoping, Mentorship, CircleCI, Jenkins, Database Design, New Relic, Code Review, Estimations, API Integration, GraphQL, Product Management, User Interface (UI), Cloudflare, Web UI, Web UX
Senior Developer
2014 - 2017
Bureau for Visual Affairs
- Gained multiple website mentions on Siteinspire, Httpsternet, and traditional press.
- Developed a website for the Alexander McQueen: Savage Beauty exhibition at V&A, which became the most visited exhibition in the UK.
- Contributed to developing websites for the most prominent UK and international artists and art organizations, such as V&A, National Theatre, Alexander McQueen, Marc Quinn, Thames & Hudson, and Sharjah Art.
Technologies: PHP, WordPress, ExpressionEngine, JavaScript, React, Microservices, SCSS, Docker, Webpack, Optimization, MySQL, HTML5, jQuery, Vanilla JS, Git, GitHub, Amazon RDS, APIs, Selenium, Web Hosting, Hosting, Mobile, eCommerce, Mobile Development, Scalability, Architecture, DevOps, Responsive Design, Gatsby, Laravel, LAMP, Amazon Web Services (AWS), Web Development, Full-stack, HTML, REST APIs, WordPress Themes, WordPress Plugins, PHP Performance, Redis, Local Hosting, Cloud, PHP 7, SQL, Unit Testing, Object-oriented Programming (OOP), Zend Framework, Laminas, Full-stack Development, Third-party APIs, Cron, Background Jobs, Back-end, Leadership, Front-end, Google Tag Manager, Google Analytics, Google Analytics 4, Linux, Apache, Cloud Architecture, Google Tag Manager API, UI Development, WebGL, AWS Lambda, Webhooks, Search Engine Optimization (SEO), Software Troubleshooting, Project Scoping, Jenkins, Database Design, New Relic, Estimations, API Integration, Cloudflare, Web UX
Experience
Hewi | Complete Redesign of an Old Website
A complete redevelopment of Hardlyeverwornit (Hewi), a Sylius/Symfony-based marketplace, using new technologies. I developed the platform's front and back end and designed most of the functionalities of the minimum viable product. Later I built and managed an internal team to improve the site and develop new features.
Vogue and Hewi | Website and Architecture for a Charity Collaboration
https://www.vogue.co.uk/article/british-vogue-hewi-the-way-we-wore-auctionA charity collaboration between Vogue and Hewi, which included social campaigns by the most known models in the world. I developed a SlimPHP-based bidding app. There was minimal time due to the nature of the project, and it had to be highly scalable. I consulted on designs and developed the website and architecture. The website was a large success. It survived the spikes in traffic and collected a lot of money for charities.
Culture Trip | Development of a WordPress-based Travel Advice Website
https://theculturetrip.com/Development of Culture Trip, a WordPress-based site with travel advice. I led the WordPress team during the development and provided architecture design for other teams. Over my tenure, we drastically increased the back-end response times by offloading specific WP responsibilities to microservices. We also extended WordPress to work with event-based architecture.
My team supported over 100 writers, working closely with internal support and the editorial team to solve bugs and improve publishing processes. At this same time, our app served 50 million monthly users across multiple channels.
My team supported over 100 writers, working closely with internal support and the editorial team to solve bugs and improve publishing processes. At this same time, our app served 50 million monthly users across multiple channels.
Shortlist/Stylist Magazines | Back-end Development of Multiple Sites
https://www.stylist.co.uk/A WordPress multisite-based React app for the Stylist and Shortlist websites and other sites for a large UK publisher. I was the lead back-end developer on the project. I provided some of the DevOps work and helped on the React side of things.
Over my four-month stint in the company, we published four different sites. They all had varying amounts of customization but ran under one back end and from a singular server. We completed all the development on time, and website stats were considerably better from the first month.
Over my four-month stint in the company, we published four different sites. They all had varying amounts of customization but ran under one back end and from a singular server. We completed all the development on time, and website stats were considerably better from the first month.
Thames & Hudson | Back- and Front-end Web Development
https://thamesandhudson.com/A Magento 2 and WordPress website for Thames & Hudson, one of the world's largest art publishers. I led the back-end development and developed a large part of its front end.
Using Magento 2 for the transactional part, we provided clients with a good base for eCommerce development. On the other hand, integrating WordPress and the Advanced Custom Fields plugin provided easier content editions and more flexibility in editing content than the Magento tools could offer.
Using Magento 2 for the transactional part, we provided clients with a good base for eCommerce development. On the other hand, integrating WordPress and the Advanced Custom Fields plugin provided easier content editions and more flexibility in editing content than the Magento tools could offer.
Aquascutum | Custom Solutions for a Magento-based Website
A Magento 1 website for one of the most known English fashion brands. I was a tech lead on a project, which was generally a straightforward transactional site that required few custom solutions, including a localized Chinese UX and Weibo integration, custom stock management, order processing, and reporting integrations. I also managed the horizontal scalability for high-profile collaborations with other brands.
Education
2009 - 2011
Undergraduate Coursework in Mathematics
Adam Mickiewicz University - Poznan, Poland
2009 - 2011
Undergraduate Coursework in Computer Science
Adam Mickiewicz University - Poznan, Poland
Skills
Libraries/APIs
React, Node.js, jQuery, WordPress API, WordPress REST API, REST APIs, Facebook API, Google Tag Manager API, Puppeteer, PayPal API, Stripe, WebGL
Tools
Cron, Google Analytics, CircleCI, Vagrant, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS), Git, GitHub, Apache, Ansible, Terraform, Webpack, Behat, Advanced Custom Fields (ACF), Jenkins
Languages
PHP, JavaScript, SCSS, CSS, PHP 7, TypeScript, HTML, SQL, HTML5, GraphQL, Java, Python
Frameworks
Symfony, Sylius, Symfony 6, Vanilla JS, Symfony 5, Tailwind CSS, Express.js, PHPUnit, Jest, Symfony 4, Laravel, Next.js, Cypress, Selenium, Zend Framework, CakePHP, Django
Paradigms
Microservices, Object-oriented Programming (OOP), Search Engine Optimization (SEO), Hosting, Mobile Development, Agile, DevOps, Unit Testing, B2B, Agile Project Management, Database Design
Platforms
WordPress, Mobile, LAMP, AWS Lambda, Docker, Amazon Web Services (AWS), Linux, New Relic, Kubernetes, AWS Elastic Beanstalk, Magento 2, Magento 1, Contentful
Storage
Redis, MySQL
Industry Expertise
Project Management
Other
Optimization, Caching, Local Hosting, Cloud, Software Architecture, Technical Leadership, eCommerce, Scalability, Architecture, Responsive Design, Web Development, Full-stack, Subscriptions, WordPress Themes, WordPress Plugins, PHP Performance, Full-stack Development, Team Leadership, Third-party APIs, Background Jobs, Back-end, Leadership, Google SEO, Front-end, Google Tag Manager, Technical Architecture, Cloud Architecture, Feasibility, Feasibility Studies, Landing Pages, UI Development, Webhooks, Software Design, Technical Consulting, Software Implementation, Software Troubleshooting, Project Scoping, Mentorship, Code Review, Estimations, API Integration, User Experience (UX), User Interface (UI), Web UI, Web UX, Trellis, PayPal, Amazon RDS, APIs, ExpressionEngine, Web Hosting, Startups, Planning, Google Analytics 4, CTO, ESLint, Growth Strategy, A/B Testing, Software Development Management, Engineering, Delivery Management, Engineering Management, People Management, Team Management, Lambda Functions, Finance, Excel 365, Product Management, Cloudflare, Encore, Gatsby, Laminas
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