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I am a **Multi-talented** professional adept in **Full Stack Web Development**, **Web Security Research**, and **Robotics Engineering**. As a dedicated Web Security Researcher and ethical hacker, I uncover vulnerabilities and mitigate security risks, bridging the gap between development and cybersecurity. Additionally, as a Robotics Engineer, I design and build sophisticated robotic systems, applying my deep understanding of mechanics, electronics, and programming. Passionate about crafting clean, scalable code and innovative robotics solutions, I contribute to projects that prioritize both robust development, cybersecurity practices, and cutting-edge robotic technology.
Experienced (17+ years) developer and friendly Ruby on Rails and React/Next.js/Redux Developer/Mentor (with passion for helping others learn) | β 3,615+ 5 β sessions/jobs. 8+ years on top of the Codementor Ranking β
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 (17+ years coding experience in total).
I have helped more than 800 individuals here at CodeMentor (with 3,615+ 5 β 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 3,615+ 5 β 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 18+ 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!
Hey! I am Johnny B. π
(Actually, my Romanian friends call me IonicΔ, which in English is basically: Johnny).
...and I π emojis!
I started coding around 2010, starting with simple static websites, WordPress applications, and then tried Node.js for the first name around 2012. Since then, I have been working with Node.js. I like it a lot.
Currently, I do the best in:
β Node.js π
β β β Command line tools
β β β Express.js
β β β Passport
β β β Raw/minimal code, without frameworks (e.g. simple HTTP server)
β β β Using npm
β β β Creating npm packages for Node.js (and for the front-end as well)
β β β Scraping the web
β β β Automation of repetitive tasks
β β β Image processing
β JavaScript β¨
β β β Creating and importing libraries
β β β jQuery (creating plugins, using them etc)
β β β Scraping
β β β Automation of repetitive tasks
β β β Publishing npm packages
β β β SVG (SVG.js, d3.js)
β HTML & CSS π¨
β β β Fixing CSS quick issues
β β β Implementing mockups
β β β Making the page responsive
β β β SEO tips & tricks
β Command line π»
β β β Shortcut tips
β β β Creating command line tools
β β β Using VIM & Tmux
β Code Review π
β β β I do code review offline, for Node.js, JavaScript, eventually CSS.
β β β Can be done in a live session as well.
β β β Security checks
β β β I point things that can be done in a better way
β Using Git & GitHub/GitLab/BitBucket etc. πΈ
β β β Introduction to how Git works
β β β Using Git hosting services (e.g. GitHub, GitLab, BitBucket etc)
β β β Top Git commands
β β β Shortcuts
If I can help, I will definitely do it, as long your app is not promoting things that tend to be potentially immoral. For example, I'm happy to help you build an e-shop, but I will probably not build an e-shop designed specifically for selling wine since I am against the use of alcohol for drinking.
β¦ π Node.js: 9 years of experience, ~700 packages published on NPM
β¦ π JavaScript: 9 years of experience, lots of libraries you can download freely (https://goo.gl/ewoQsK)
β¦ π£ Fluent in speaking English & Romanian, and comfortable in Spanish & Portuguese
β¦ πΈ GitHub Enthusiast (follow me: https://github.com/IonicaBizau)
β¦ π» Git & GitHub power user
β¦ π Comfortable with MongoDB (especially, the native driver for Node.js)
β¦ βοΈ I will not charge you if I can't fix your issue.
Why you can trust me:
β I am a vegetarian. I have never eaten meat. ππ₯π₯
β I have never drunk wine, beer, etc. Water is the best. π§
β I work for 6 days, and I rest on the 7th day. That's why I am *not* available on Saturdays (specifically between Friday's sunset and Saturday's sunset, my location at the timeβyou can my timezone a little bit below). π
β I sleep between 9:18 PM and 4:42 AM. Depending on your timezone I can wake up earlier if you book a session with me. π€
β I am a musician (pianist and organist). πΉ
β I use VIM on macOS and Linux. π§π
Started programming at age 12 in 1988 on a Commodore VIC-20. Extremely adept at debugging of all kinds, performance optimization, databases, embedded systems, operating systems, networking, testing and automation across a wide variety of languages, APIs and frameworks, high level as React/Typescript and as low level as knowing several CPUs assembly languages and designing microcontroller PCBs. It is way too much to just enumerate. Formerly worked at Microsoft in Windows Protocols and Engines team.
I teach Operating Systems to CS students and guide fellow professionals through legacy codebase maintenance, practical software architecture, and new language/framework learning skills.
For students, I offer two types of sessions - one is a lecture-style session where I can go over course notes/slides on a particular topics and offer additional explanations and examples to improve your understanding of the material. Another type is an assignment take-up session where I can go over a past assignment and guide you through steps to solving it.
For working professionals, I offer the following options:
* Focused problem-solving sessions - if you have a particular issue that you're stuck with in a project you're working on, I can pair with you over Zoom screen-sharing
* Code review - if you cannot understand how to work with part of your codebase or if you'd like a second opinion on work that you've just completed, I can pair with you over Zoom and do a live code review and/or prepare ahead of time and go over my findings on a call
* Long-term mentorship - if you would like to learn some more fundamental skills or pick up a framework/design pattern/best practices, I can develop a custom-tailored learning plan that fits your skill level and schedule and offer regular teaching sessions with optional take-home exercises
A bit about me
---
I am a tech founder and a senior polyglot/full-stack developer, with a passion for teaching and mentorship. In a bit of spare time from my work, I am looking to help fellow software developers get more comfortable with our craft and exercise my teaching skills while I'm at it.
So far, I've done a wide range of work - web app front-end and back-end, data pipelines at scale, DevOps/infrastructure, mobile (quite a bit of iOS and previously some Android) and some security. I have a reasonable taste for UI design and user experience, despite that not being my primary specialization.
The industries I've worked in so far were heavily concentrated around finance/banking/FinTech and GovTech, although I've also been a founding developer at a couple of B2C startups and learned a lot throughout that experience.
My personal research interests include operating systems and programming language theory.
As cliche as it sounds, I try to learn something new all the time and I consider this of vital importance to my professional skillset. I always prioritize systems understanding and learning how to learn over memorizing APIs - and it's a philosophy that I try to share with my students as well.
Teamwork and constant exchange of expertise with my peers is a close second most important value to me. A software product can be almost meaningless without a team that welcomes learning from failures, encourages curiosity and fosters true human friendships, and empathy both towards each other and towards the customers of the software we create.
New client intake process
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1. Intro/triage call [free of charge] [15 min] - this is a Zoom video call where I try to understand your background, the problem you're looking to solve and whether I believe we'd be a good fit for a productive mentor/mentee relationship.
2. Supplemental terms acceptance - as an independent contractor and not an employee of Arc, I ask my clients to accept a few additional terms that make session time measurement, scheduling and work product acceptance more precise, and further clarify the extent of our mentorship relationship.
3. Creation of Freelance Job/Scheduled Session on Codementor - if you haven't done that yet, I will ask you to create and assign me a freelance job and/or a scheduled session with a precise description of the topics we would be covering.
For certain sessions, preliminary preparation may be required - if that is the case, we would discuss the details and estimated time ahead of time and a Freelance Job would be required to cover the effort of the preparation.
Availability
---
Please take a look at my Codementor calendar to plan intro calls and sessions. Generally, I am available between 3:30pm and 8pm Eastern Time (New York/Toronto), Monday to Saturday, but I try to schedule all of my teaching engagements between 6pm and 8pm whenever possible.
*IMPORTANT: Urgent sessions are unfortunately not available at this time.* I am currently working through Codementor as a mentor, and unable to work as an on-call freelance developer.
Please also note that I cannot provide consultations over chat - in my experience, it's generally more time-consuming for everyone, and copy-pasting code over chat can get messy. For those reasons, I only work through Zoom video calls with screen sharing.
If you have any questions about the process or would like to book a call, I am happy to chat on Codementor - I should be usually available Monday-Saturday, 1pm - 8pm Eastern Time, subject to my other engagements. While I try to respond as soon as I can, I may take up to one business day or longer depending on how busy my schedule might get.
As a seasoned full-stack developer and certified cloud developer with over 14 years of diverse IT experience, I bring knowledge and expertise to every project. My proficiency spans Java 21, SpringBoot, Spring Cloud, Python, OSGi, Node.js, Angular, and TypeScript, ensuring robust and scalable solutions tailored to client needs.
Experienced senior Java developer with expertise in integrating Azure OpenAI services and large language models (LLMs) to build AI-driven solutions. Proficient in leveraging gRPC, Java 21, and Python for real-time AI applications, especially in the healthcare domain.
My hands-on experience with Docker and Kubernetes enables me to create efficient, containerized applications that streamline development and deployment processes. Furthermore, I have vast DevOps experience, expertly utilizing Azure ADO, Git, and CI/CD pipelines to enhance development workflows and ensure seamless integration and delivery.
As a certified Azure Cloud Developer, I specialize in designing and implementing cloud infrastructure that drives innovation, operational efficiency, and scalability. I have successfully architected and deployed numerous cloud-based solutions, leveraging the power of Azure to deliver high-performance, secure, and cost-effective systems.
I possess strong communication skills and excel in distributed environments, ensuring clear and effective collaboration with distributed teams and clients. My ability to articulate complex technical concepts simply has been instrumental in driving project success.
I have significant experience in Kafka, building RESTful services, and working within a microservices environment, which allows for scalable, resilient, and maintainable software architecture.
See the power of our Application Security tutors through glowing user reviews that showcase their successful Application Security learning journeys. Don't miss out on top-notch Application Security training.
βEli was very genuine about his experience and suggested the right direction for my needs. Very knowledgable in application design.β
Rajasekhar Rongala / May 2020
Eli Dupree
Application Security tutor
βAmazing support, guidance and overal mentorship from Anup. A true expert with Power BI - I've learned so much in our call, and progress more than weeks worth of solo effort in a short span of time. I plan to reach out and ask for mentorship again for any and all Power BI troubeshooting.β
Amir Ali / Nov 2024
Anup Mistry
Application Security tutor
βI spent 7 hours with a team over two days trying to figure out an issue that Olaide kindly, and easily fixed in 30 minutes. We still have not heard back from WebFlow support and are so grateful Olaide was able to hop on quicky and get it resolved.β
Naima Nawabi / Nov 2024
Olaide Alaka Afolayan
Application Security tutor
βDejan was an amazing instructor who really went in depth on the material and helped me prepare for my interviews. I really felt a lot better after our sessions and that I understood the topics. He does not just give you the solutions but really helps you understand everythingβ
Fernando Guimaraes / Nov 2024
Dejan B.
Application Security tutor
How to find Application Security tutors on Codementor
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Step 3 Book Application Security tutoring sessions
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We'll help connect you with a Application Security tutor that suits your needs.
Find the most suitable Application Security tutor by chatting with Application Security experts.
Arrange regular session times with Application Security tutors for one-on-one instruction.
Frequently asked questions
How to learn Application Security?
Learning Application Security 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 Application Security. 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 Application Security, 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 Application Security 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 Application Security through forums and online communities. This engagement offers support, new learning resources, and insights into industry practices.
Build real-world projects: Apply your Application Security skills to real-world projects. This could be anything from developing a simple app to contributing to open source projects. Using Application Security in practical applications not only boosts your learning but also builds your portfolio, which is crucial for career advancement.
Stay updated: Since Application Security 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 Application Security?
The time it takes to learn Application Security 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. Hereβs a general framework to help you set realistic expectations:
Beginner level: If you are starting from scratch, getting comfortable with the basics of Application Security 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 Application Securityβs more advanced features and best practices.
Advanced level: Achieving proficiency or an advanced level of skill in Application Security generally requires at least 2 years of consistent practice and learning. This includes mastering sophisticated aspects of Application Security, contributing to major projects, and possibly specializing in specific areas within Application Security.
Continuous learning: Technology evolves rapidly, and ongoing learning is essential to maintain and improve your skills in Application Security. Engaging with new developments, tools, and methodologies in Application Security 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 Application Security tutor on Codementor?
The cost of finding a Application Security 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 Application Security 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 Application Security tutorsβ 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 Application Security with a dedicated tutor?
Learning Application Security 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 Application Security, 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 Application Security 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 Application Security 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 Application Security in a structured, supportive, and effective environment.
How does personalized Application Security mentoring differ from traditional classroom learning?
Personalized Application Security 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 studentβs 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 Application Security.