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Full-stack software craftsman and technical leader with over 15 years of experience. Equally adept at system design, programming, technical leadership, mentorship, and business collaboration. Have a wide breadth of technical experience, but specialize in backend API development, relational databases, and web applications. Passionate about simplicity and efficiency.
I have worked at over a dozen companies large and small, in a handful of different domains. Also participated in hundreds of interviews, about half-and-half as the interviewer and the interviewee. I have given dozens of talks and training sessions on a variety of topics, mostly focusing on distributed systems, caching, and testing.
My top skills are Java, SQL, testing, and refactoring.
I have experience with formal academic and professional mentorship, and would love to help you skill up, solve a problem, or just nerd out with you today!
I'm a NET Core developer to the bones. My co-workers always describe me as a having integrity, reliable person and I am able to create a trustful environment where candid feedback can flow freely.
I took the biggest step from the last job, where I was hired to review and audit the code and the technical solution of the product under development. My contribution to this project was pushing the product from an intentional state into something that created pleasure and happiness for nearly every stakeholder.
In addition, In my free time, I'm engaged in an open-source community. My contribution ranges from explaining, PR reviews, fixing bugs, and creating new features with the result of creating one of the most loved solutions in that space (or niche).
With 13+ years in the HighTech industry, including 9 years in FinTech, I specialize in building scalable, high-performance backend systems for eCommerce and financial platforms. My expertise lies in Java, Spring Boot, Microservices, Domain-Driven Design (DDD), and Relational Databases, ensuring businesses have reliable, efficient, and secure infrastructures.
Beyond my technical role, I am passionate about mentorship and community impact. I led a Backend Guild, fostering knowledge sharing and best practices across engineering teams. I also co-managed the Tech-Blogging Program at Baot, helping women in tech publish their first technical articles, and served as an Intuit Women’s Network ERG Leader, advocating for career growth and inclusion in tech.
Over the years, I played a pivotal role in architectural transformations and financial integrations, including:
✅**Hybrid SDK for Sensitive Data Detection (Intuit)** – Designed a Hybrid SDK that enabled dynamic configuration updates without requiring SDK version upgrades. Extracted validation logic from the SDK and represented it as mathematical expressions. This approach was secured through a patented method: Secure, Dynamically Loaded Input Validation Using Mathematical Expressions.
✅ **Monolith to Microservices Transition (Behalf)** – Led the company’s first microservice transition, mentored other teams, and introduced an Anti-Corruption Layer (ACL) to bridge legacy dependencies and ensure a smooth migration.
✅ **Wells Fargo Integration** – Engineered a seamless connection to enhance payment processing.
✅ **Cross River Bank & PPP Integration** – Led the integration efforts during the pandemic, enabling SMBs to access critical funding through the Paycheck Protection Program (PPP).
Now, as a freelance backend engineer, consultant, and mentor, I help businesses architect scalable eCommerce platforms, optimize payment flows, and build robust backend infrastructures tailored to their needs.
💡 What I Offer:🔹 **Backend Development** – Scalable, high-performance Java & Spring Boot applications.
🔹 **Consulting & Mentorship** – Guiding teams on architecture, best practices, and code quality.
🔹 **Code Reviews** – Ensuring clean, efficient, and maintainable codebases.
🔹 **Public Speaking & Thought Leadership** – Sharing insights on backend development, FinTech, and eCommerce.
Let’s connect! Whether you need backend expertise, consulting, or mentorship, I’m happy to help. 🚀
* in 2000 as a founding engineer, I helped to build a local version of [Morningstar.com](http://morningstar.com/) from the idea to IPO and scale the development team from 1 to 10; I've administered Linux & FreeBSD servers, managed a complex PostrgreSQL database, wrote triggers and implemented a custom MVC web application using perl,
* in 2005-2010 worked as a senior Java developer for a large international supply chain solutions provider (Syncron - [https://www.syncron.com/](https://www.syncron.com/));
* since 2010 have worked on +100 various consulting projects, using Rails, Python, Django, Flask, PHP, Objective-C, Rust, C++, Typescript, Java, Scala, Odoo and more; clients include Alation (https://www.alation.com/), Lonza (https://www.lonza.com/), Vantage Surgical (https://vantage.healthcare/), FurnitureFinders (https://www.furniturefinders.com/), Tanzle (https://tanzle.com/)
* 25 years of software development experience; full-stack, devops but also focused on the product & user experience/value,
* I'm based in LA
I strongly believe that Code Quality Matters. I hold myself to high standards even in smaller projects, and in my spare time I keep learning about the latest technologies and architectural design patterns.
My favorite topics are performance optimization and concurrency, but I am keen on and proficient in a wide variety of technologies (especially if it has something to do with C# or React which I love). Even though most of my work experience revolves around building ASP.NET Core Web APIs and React/Redux(/TypeScript) frontends, I have had projects involving Windows Forms, WPF, Xamarin Forms / Android, numerous console apps, etc.
Besides learning, I also love to share my knowledge with others. My favorite part of leading the development team at my current workplace is being able to mentor junior devs who share my passion in ever improving their design, code quality and performance.
Check out my self-built blog where I document my developer journey: https://marcelltoth.net
• More than 19 years of overall software development experience having expertise in all stages of the whole software development life cycle.
• Microsoft Certified Solution Developer in .Net
• Proficient in Object Oriented Analysis and Design(OOAD), Object Oriented Programming (OOP), ,design patterns, software development best practices, Agile development Methodology, and TDD
• Excellent interpersonal, communication and organizational skills, productive relationships by working effectively with team members at all levels; easily adapt to new environments and with great potential to learn.
• Have a great passion about technology and always try to keep up by reading tech blogs, checking out developer podcasts and webcasts, and attending developer training classes
See the power of our Domain-Driven Design tutors through glowing user reviews that showcase their successful Domain-Driven Design learning journeys. Don't miss out on top-notch Domain-Driven Design training.
“It was an awesome chat, I really enjoyed it! We did solve the problem I had, and I was satisfied with the solution. It seemed that Lucas also enjoyed the discussion and committed as much as possible to it.“
Danijel Obradovic / Sep 2023
Lucas Meine
Domain-Driven Design tutor
“Dejan is one of the best system design instructors I've ever come across. He offered a socratic teaching style which made me understand not just what components to use, but why they're optimal for given features of a system. We even went into the history of understanding certain challenges of systems. I'm looking forward to my next lesson and now feel more confident after working with him!“
Lerena Holloway / Mar 2025
Dejan B.
Domain-Driven Design tutor
“Very patient, knowledgeable and understanding. We were appreciative of his insights. Best of all his on-demand available during U.S. working hours was mission critical. Having Rahul as a mentor was the best investment that we made in our businesses, empowering us to complete our project efficiently but most importantly learn the skills required to become self sufficient and self sustaining. Code Mentor is the best for mentors and freelance developers.“
Rhonda Coleman / Mar 2025
Rahul Choudhary
Domain-Driven Design tutor
“I had a fantastic mentoring session with Dejan. He demonstrated a deep understanding of Data Structures and Algorithms and, more importantly, shared valuable advice on how to effectively present my knowledge to the interviewer throughout the interview. I particularly appreciated his advice on the importance of jotting down notes about different approaches to solving the problem and the trade-offs of each, and how that could help me stay organized and make me stand out as an interviewee.“
Anirudh / Mar 2025
Dejan B.
Domain-Driven Design tutor
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Frequently asked questions
How to learn Domain-Driven Design?
Learning Domain-Driven 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 Domain-Driven 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 Domain-Driven 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 Domain-Driven 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 Domain-Driven Design through forums and online communities. This engagement offers support, new learning resources, and insights into industry practices.
Build real-world projects: Apply your Domain-Driven Design skills to real-world projects. This could be anything from developing a simple app to contributing to open source projects. Using Domain-Driven Design in practical applications not only boosts your learning but also builds your portfolio, which is crucial for career advancement.
Stay updated: Since Domain-Driven 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 Domain-Driven Design?
The time it takes to learn Domain-Driven 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 Domain-Driven 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 Domain-Driven Design’s more advanced features and best practices.
Advanced level: Achieving proficiency or an advanced level of skill in Domain-Driven Design generally requires at least 2 years of consistent practice and learning. This includes mastering sophisticated aspects of Domain-Driven Design, contributing to major projects, and possibly specializing in specific areas within Domain-Driven Design.
Continuous learning: Technology evolves rapidly, and ongoing learning is essential to maintain and improve your skills in Domain-Driven Design. Engaging with new developments, tools, and methodologies in Domain-Driven 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 Domain-Driven Design tutor on Codementor?
The cost of finding a Domain-Driven 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 Domain-Driven 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 Domain-Driven 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 Domain-Driven Design with a dedicated tutor?
Learning Domain-Driven 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 Domain-Driven 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 Domain-Driven 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 Domain-Driven 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 Domain-Driven Design in a structured, supportive, and effective environment.
How does personalized Domain-Driven Design mentoring differ from traditional classroom learning?
Personalized Domain-Driven 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 Domain-Driven Design.