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My availability is as shown on my calendar. Feel free to book a time!
My focus is on Python/Django applications. I have theoretical and practical knowledge of computer systems engineering, including but not limited to: operating systems, databases and database design, version control, programming languages for server and client-side development and computer systems architecture.
I'm Matei, a full-stack developer with over 10 years of experience, specializing in JavaScript, React, and Node.js. I help developers at all levels overcome challenges, from debugging complex issues to understanding core concepts. My approach is patient and tailored to your needs, ensuring you gain confidence and clarity in your coding journey.
Format:
- regular (long term) or one-time
- for any level (beginner/intermediate/advanced)
- personalized take-home tasks & resources
- 45-90min sessions, up to 6hrs/day on request
Availability:
- 4:00-18:00 UTC on workdays
- irregular on weekends
- last minute or late night sessions on request (email matei@copot.eu)
Technologies:
- JavaScript: ESNext, NodeJS/Deno, TypeScript, React, Vue, NodeMCU, & more
- Front-end Web Dev: HTML5, CSS3, responsive design, PWAs, SPAs, & more
- Back-end Web Dev: Express/NextJS APIs, Python, AWS, Docker, SQL, PHP, & more
- App Dev: Mac/Linux & Android, Electron, Expo, Python, Stripe, UX, & more
- others: always curious about other technologies, e.g. haskell, ruby, WASM, WebGL...
= Why me?
I'm typically paid €100/hr by top companies, so the lower rate here means you're getting top-tier expertise at an accessible price. I enjoy mentoring because it brings variety and a more collaborative and relaxed dynamic.
I have a proven track record of guiding learners from zero experience to landing high-paying jobs. My teaching adapts to your pace and goals: you'll always get honest, actionable advice, including what's realistic and what's not.
If you're serious about growing your skills or career in tech, I'd be glad to support your journey.
CTO and technical architect who builds scalable platforms and the engineering teams behind them. Author of _React — The Road To Enterprise_ and _Vue — The Road To Enterprise_. Speaker at React Summit, React Advanced London, and Vue Amsterdam.
Currently serving as CTO in the energy sector, where I consolidated three separate codebases into a single multi-tenant white-label platform — designing the full architecture from tenant-isolated data and custom domain routing to a granular RBAC permissions system built from scratch. I personally conduct penetration testing, and identified and fixed SQL injection and path traversal vulnerabilities in production. I resolved a critical performance bottleneck where PDF generation blocked the entire server for 60+ seconds, and built Playwright e2e test suites that automated quarterly financial verification — replacing hours of manual QA.
I build the full stack — React, React Native, Next.js, Vue, Node.js, TypeScript, PostgreSQL, MySQL, Docker, AWS — but what I bring beyond the stack is the ability to make hard architectural calls and follow through on them in production. I've established engineering functions from scratch, hired and mentored teams, and led the structured adoption of AI-augmented development workflows with defined standards and guardrails.
### Credentials
I'm the author of "React - The Road To Enterprise" and "Vue - The Road To Enterprise," covering advanced patterns, scalability, and best practices for building production-grade applications ([https://theroadtoenterprise.com](https://theroadtoenterprise.com/))
I've spoken at and led workshops at major international conferences including:
* React Summit — Composition vs Configuration: How to Build Flexible, Resilient and Future-proof Components ([https://portal.gitnation.org/contents/composition-vs-configuration-how-to-build-flexible-resilient-and-future-proof-components](https://portal.gitnation.org/contents/composition-vs-configuration-how-to-build-flexible-resilient-and-future-proof-components))
* React Advanced London — Advanced Patterns for API Management in Large-Scale React Applications ([https://portal.gitnation.org/contents/advanced-patterns-for-api-management-in-large-scale-react-applications](https://portal.gitnation.org/contents/advanced-patterns-for-api-management-in-large-scale-react-applications))
* Vue Amsterdam — Vue Experts Panel & The Case Study of Findlay Web Tech ([https://www.youtube.com/live/El8Jw2CFj7g?si=EUVzHQgAbtPNUAwq&t=5507](https://www.youtube.com/live/El8Jw2CFj7g?si=EUVzHQgAbtPNUAwq&t=5507))
* React Wednesdays — Best Practices for Testing React Apps ([https://www.telerik.com/react-wednesdays/react-wednesdays-best-practices-for-testing-react-apps](https://www.telerik.com/react-wednesdays/react-wednesdays-best-practices-for-testing-react-apps))
* GDG React Workshop — How to Handle APIs in React Applications
### Technical Stack
Frontend: React, Next.js, Vue, Nuxt, React Native, TypeScript
Backend: Node.js, Express, Fastify, Python, PHP Databases: MySQL, PostgreSQL, Firebase Infrastructure: AWS Lambda, BullMQ, VPS, Docker, GitHub Actions, Datadog Testing: Playwright, Vitest, E2E & API test automation Security:
Penetration testing, RBAC design, SQL injection & path traversal remediation AI Tooling: Cursor, Claude Code, AI-augmented development workflows
### Who I Work With
Open to remote contract or permanent roles in senior full-stack engineering, technical architecture, tech lead, or CTO engagements. Also available for architectural consulting and technical due diligence.
Self-taught full stack developer. Helped over thousands of clients to build their small to large scale websites. I love building high performance and scalable websites.
Over the past few years, I have been heavily working on WordPress and Laravel. My top skills are: WordPress (oh, not to mention I used many popular plugins like: ACF, Gravity Forms, etc.), Laravel, MongoDB, MySQL, ElasticSearch, jQuery, Bootstrap, Redis, RETS integration, Plesk, WHM and many more! I occasionally do system admin tasks as I am managing plenty of servers running on CentOS. If you are lost in coding, need a hand or running out of ideas, feel free to reach out to me. I am not available for a full time hire but happy to help you with any kind of help you need with your projects.
I love to solve issues and debug problems that might arise into smaller solutions that make it well clear and more meaningful for anyone. I have vast knowledge with over 6 years of experience in programming with different technologies
See the power of our Responsive Design tutors through glowing user reviews that showcase their successful Responsive Design learning journeys. Don't miss out on top-notch Responsive Design training.
“MY HERO!!!
Philip redefines "EXPERT". No one can come close to this guy. (No Joke.)
Call it a miracle. Devine Introvention. Or Destiny.
Within 15 minutes Philip fixed everything the 13 prior "experts" could not.
No way. 15 minutes? How could that be?
I Googled him --- "Track record spans Apple, PayPal, Medallia, Pipefy, and ArcTouch, where --- he helped revolutionize design systems, web accessibility, data visualization, and interactive experiences--.!!!
Wait. What?!!
Two Words for Philip:
THE MASTER.
“
april masini / Jan 2026
Philip Warkentien II
Responsive Design tutor
“I had a great experience working with Alan. He was knowledgeable in CSS and was able to get to the root of the issue I was facing. He was able to to iterate through solutions efficiently until we found the right fix, and was friendly, communicative, and easy to collaborate with throughout the process. Highly recommend!“
Jessica Alberto / May 2025
Alan Santos
Responsive Design tutor
“Olaide is AMAZING with Webflow! She is great and super fast and knowledgeable. She knew how to fix all my little problems in Webflow. I will definitely use her help again.“
Madison Dunaetz / Dec 2024
Olaide Alaka Afolayan
Responsive Design tutor
“Calvin was very helpful with a HTML/CSS project I needed to fix, so if you need HTML/CSS help, he's definitely knowledgeable in that area!! It was a great session!“
Brie W / Jul 2024
Calvin T
Responsive Design tutor
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We'll help connect you with a Responsive Design tutor that suits your needs.
Find the most suitable Responsive Design tutor by chatting with Responsive Design experts.
Arrange regular session times with Responsive Design tutors for one-on-one instruction.
Frequently asked questions
How to learn Responsive Design?
Learning Responsive Design effectively takes a structured approach, whether you're starting as a beginner or aiming to improve your existing skills. Here are key steps to guide you through the learning process:
Understand the basics: Start with the fundamentals of Responsive Design. You can find free courses and tutorials online that cater specifically to beginners. These resources make it easy for you to grasp the core concepts and basic syntax of Responsive Design, laying a solid foundation for further growth.
Practice regularly: Hands-on practice is crucial. Work on small projects or coding exercises that challenge you to apply what you've learned. This practical experience strengthens your knowledge and builds your coding skills.
Seek expert guidance: Connect with experienced Responsive Design tutors on Codementor for one-on-one mentorship. Our mentors offer personalized support, helping you troubleshoot problems, review your code, and navigate more complex topics as your skills develop.
Join online communities: Engage with other learners and professionals in Responsive Design through forums and online communities. This engagement offers support, new learning resources, and insights into industry practices.
Build real-world projects: Apply your Responsive Design skills to real-world projects. This could be anything from developing a simple app to contributing to open source projects. Using Responsive Design in practical applications not only boosts your learning but also builds your portfolio, which is crucial for career advancement.
Stay updated: Since Responsive Design is continually evolving, staying informed about the latest developments and advanced features is essential. Follow relevant blogs, subscribe to newsletters, and participate in workshops to keep your skills up-to-date and relevant.
How long does it take to learn Responsive Design?
The time it takes to learn Responsive Design depends greatly on several factors, including your prior experience, the complexity of the language or tech stack, and how much time you dedicate to learning. Here’s a general framework to help you set realistic expectations:
Beginner level: If you are starting from scratch, getting comfortable with the basics of Responsive Design typically takes about 3 to 6 months. During this period, you'll learn the fundamental concepts and begin applying them in simple projects.
Intermediate level: Advancing to an intermediate level can take an additional 6 to 12 months. At this stage, you should be working on more complex projects and deepening your understanding of Responsive Design’s more advanced features and best practices.
Advanced level: Achieving proficiency or an advanced level of skill in Responsive Design generally requires at least 2 years of consistent practice and learning. This includes mastering sophisticated aspects of Responsive Design, contributing to major projects, and possibly specializing in specific areas within Responsive Design.
Continuous learning: Technology evolves rapidly, and ongoing learning is essential to maintain and improve your skills in Responsive Design. Engaging with new developments, tools, and methodologies in Responsive Design is a continuous process throughout your career.
Setting personal learning goals and maintaining a regular learning schedule are crucial. Consider leveraging resources like Codementor to access personalized mentorship and expert guidance, which can accelerate your learning process and help you tackle specific challenges more efficiently.
How much does it cost to find a Responsive Design tutor on Codementor?
The cost of finding a Responsive Design tutor on Codementor depends on several factors, including the tutor's experience level, the complexity of the topic, and the length of the mentoring session. Here is a breakdown to help you understand the pricing structure:
Tutor experience: Tutors with extensive experience or high demand skills in Responsive Design typically charge higher rates. Conversely, emerging professionals might offer more affordable pricing.
Pro plans: Codementor also offers subscription plans that provide full access to all mentors and include features like automated mentor matching, which can be a cost-effective option for regular, ongoing support.
Project-based pricing: If you have a specific project, mentors may offer a flat rate for the complete task instead of an hourly charge. This range can vary widely depending on the project's scope and complexity.
To find the best rate, browse through our Responsive Design tutors’ profiles on Codementor, where you can view their rates and read reviews from other learners. This will help you choose a tutor who fits your budget and learning needs.
What are the benefits of learning Responsive Design with a dedicated tutor?
Learning Responsive Design with a dedicated tutor from Codementor offers several significant benefits that can accelerate your understanding and proficiency:
Personalized learning: A dedicated tutor adapts the learning experience to your specific needs, skills, and goals. This personalization ensures that you are not just learning Responsive Design, but exceling in a way that directly aligns with your objectives.
Immediate feedback and assistance: Unlike self-paced online courses, a dedicated tutor provides instant feedback on your code, concepts, and practices. This immediate response helps eliminate misunderstandings and sharpens your skills in real-time, making the learning process more efficient.
Motivation and accountability: Regular sessions with a tutor keep you motivated and accountable. Learning Responsive Design can be challenging, and having a dedicated mentor ensures you stay on track and continue making progress towards your learning goals.
Access to expert insights: Dedicated tutors often bring years of experience and industry knowledge. They can provide insights into best practices, current trends, and professional advice that are invaluable for both learning and career development.
Career guidance: Tutors can also offer guidance on how to apply Responsive Design in professional settings, assist in building a relevant portfolio, and advise on career opportunities, which is particularly beneficial if you plan to transition into a new role or industry.
By leveraging these benefits, you can significantly improve your competency in Responsive Design in a structured, supportive, and effective environment.
How does personalized Responsive Design mentoring differ from traditional classroom learning?
Personalized Responsive Design mentoring through Codementor offers a unique and effective learning approach compared to traditional classroom learning, particularly in these key aspects:
Customized content: Personalized mentoring adapts the learning material and pace specifically to your needs and skill level. This means the sessions can focus on areas where you need the most help or interest, unlike classroom settings which follow a fixed curriculum for all students.
One-on-one attention: With personalized mentoring, you receive the undivided attention of the tutor. This allows for immediate feedback and detailed explanations, ensuring that no questions are left unanswered, and concepts are fully understood.
Flexible scheduling: Personalized mentoring is arranged around your schedule, providing the flexibility to learn at times that are most convenient for you. This is often not possible in traditional classroom settings, which operate on a fixed schedule.
Pace of learning: In personalized mentoring, the pace can be adjusted according to how quickly or slowly you grasp new concepts. This custom pacing can significantly enhance the learning experience, as opposed to a classroom environment where the pace is set and may not align with every student’s learning speed.
Practical, hands-on learning: Mentors can provide more practical, hands-on learning experiences tailored to real-world applications. This direct application of skills is often more limited in classroom settings due to the general nature of the curriculum and the number of students involved.
Personalized mentoring thus provides a more tailored, flexible, and intensive learning experience, making it ideal for those who seek a focused and practical approach to mastering Responsive Design.