We Help JavaScript Developers Level Up Their Skills And Careers 🔥

Clarity & Custom Plan
Find your technical gaps, and put in place a systematic plan to fix them for you to level up as a JavaScript developer.
Master The Fundamentals 
Use a step-by-step process to master "the Fundamentals" and grasp of the big picture so you can deliver at Senior level.
Deliver Confidently End-to-end
Master the end-to-end software lifecycle and deliver independently like a Senior Developer.

Our Mentees work at

Mentorship With Results

Custom Plan.

Find your skill gaps
You will find out exactly where you stand right now as a developer and what is the gaps for you to make the jump to the next level.
Strategy and Mindset.
With our help you will clearly define what to do next, so you know exactly where you are going as a developer from now on.
Systematic Approach
Timing is everything. You will make sure that you fill your technical gaps in the right order.
Get into the top 5%
By implementing our system you will be the one choosing what companies to work for and how much you make.

Fundamentals Over Frameworks.

Bottom Up Approach
We will help you shift your focus from frameworks to principles and patterns, and develop a solid technical foundation that will serve you for a lifetime.
Goodbye Side Projects 
Side Projects take a life on their own and repeat things you already know. You must focus on the ins and outs of building production level software instead.  
Mental Models
You will leverage mental models and proven principles instead so no matter the trends or frameworks going around, you are on top of your game. 
No more “Courses”
Together we will focus on doing, on collaboration and feedback instead of binge watching content that you will forget shortly after. 

Feedback and Accountability.

Personal Coaching
You will get daily personalized individual feedback from Dragos & Bogdan (as code reviews and live Q&A calls).
An exclusive group with 150+ software developers, 30+ Senior Engineers and FAANG alumni that you can connect and share experiences with instantly.
You will have weekly/monthly check ins with us to hold you accountable and make sure you are hitting your goals. 
Get 24/7 support via the community or email/chat/calls with us as you implement through the program.

Your Journey To Success


Find your technical gaps

Through our 360 Technical Mastery assessment you will know what are the exact things you need to put in place to get to the next level.

Step-by-step custom plan 

Put in place a systematic step-by-step plan to eliminate all the guessing and jumping around.

Master the Fundamentals

You can’t build a castle on sand. Before jumping on learning new things, you will first make sure the things you know you know deep. To get to senior, delivering in the Sprint is not enough.

Deliver End-To-End

Be able to deliver independently without constantly asking for help by moving up the stack and mastering the complete software lifecycle.

Big Picture

Transition from the JavaScript developer to a Software Engineer by putting in place timeless mental models critical when making technical decisions.
developers in program
***average salary increase after the program
+2mil $
in salary increases for the developers we worked with

Student Results

  • Nabil Eldirsi

    Senior Frontend Developer - London, UK
    Senior Title, 33% salary increase
    “You guys are always there. That has been highly beneficial.”
  • Arti Mathanda

    Full-stack Engineer - London, UK
    No Impostor Syndrome, Better Position
    “I filled the gaps in my knowledge with a clear direction and guidance.”
  • Lucian Mot

    Full-stack Developer - London, UK
    80% salary increase, Senior position
    "My salary improved by around 80%. This is amazing."
  • Constantin Linsic

    Frontend Developer - Bristol, UK
    From Junior To Confident Mid-level
    “I got so many offers. You learn how to express yourself technically.”
  • Izaak Chater

    Frontend Developer - Australia
    New Job, Senior Level Position
    "Things were not looking good, but after I found you, things turned around."
  • Mohammed Edun

    Senior Full-stack Developer - Canada, Remote
    New Job, More Confidence, Better Salary
    "I improved my technical skills in a very short amount of time. I got good at interviewing. For me the weekly calls were the best. I would be able to get immediate feedback and act on it."
  • Zoe Thexton

    Full-stack Developer - Bristol, UK
    New Job, Better Tech Stack
    "Having you guys in the corner has been really great."
  • Jana Kunft

    Principal Engineer - London, UK
    Technical Leadership, Confidence, Salary
    "Having you guys in the corner has been really great."
  • Jarek Wyprzal

    Full-stack Developer - Bristol, UK
    New Job, Full-stack, Better Salary
    "I got two job offers and my salary increased over 50%."
  • Steffen Häfelinger

    Frontend Developer - Hamburg, Germany
    Early Promotion, Full Stack
    "I got a promotion and clear focus."
  • Shanzar Kanapin

    Senior Frontend Developer - Hamburg, Germany
    New Position After Layoffs, Better Salary
    "It helped me to have a structure and get a new job with a very tight deadline. "
  • Guido Carruci

    Frontend Developer - Italy, Remote
    More Confidence, Better Salary
    "At work I feel much more confident. I feel I am on the right path. I got much better at technical interviews. I also got a new job."
  • Chris Joiner

    Frontend Developer - York, UK
    Back to Writing Code As A Senior Developer
    "I wanted to fill my gaps to the Senior level and have already done side projects and online courses. I was looking for something more efficient, that's when I found you."
  • Michael Williams

    Frontend Developer - London, UK
    More Confidence, New Position
    "I was confident I can answer any interview question."
  • Andy Gummer

    Senior Frontend Developer - Dublin, Ireland
    From coding  to leading a team
    “The peace of mind of knowing you have someone to ask has already made it worth doing.”
  • David Lazar

    Frontend Developer - London, UK
    Confidence, Pay Increase, New Position
    “You guys really helped me with the interview process.”
Alex Zahar
Fontend Engineer

Enrolling in your mentoring program is one of the best decision I have taken in my software career so far, I would always repeat this experience!

18 Aug, 2021
Jana Kunft
Senior Software Engineer

This program has been and still is absolutely invaluable for me, and I highly recommend it to everyone

Jul 27, 2022
Ilaria Corda
Backend Engineer

Within one month of enrolling into the program, I managed to land a fantastic job and place myself in a salary range I could not remotely hoped for before.

Jan 31, 2022
Fahed Arshad
Full-stack Engineer

Working with Dragos and Bogdan has been an amazing experience where I have been able to not only increase my salary by 40% but also have the technical skills of a true senior software engineer.

17 Aug, 2022
Keith Waters
Fontend Engineer

The most helpful part was all of the motivation and mindset work. Without that, I would not have been able to go from a Mid level to a Senior position at a new company.

Apr 29, 2022
Håvard Andersen
Fontend Engineer

Dragos and Bogdan were instrumental in landing me close to a six figure (USD) salary at a world-renowned consultancy.

Feb 4, 2022
Kirsten O'Farrell
Fontend Engineer

Joining theSeniorDev is truly the best decision I could have made for my career.

Feb 3, 2022
Arti M

If you're tired of hopping from one tutorial to another, tired of trying to keep up with the endless new frameworks and just want to get your fundamentals right and learn how to learn, then this is the place for you!

Aug 14, 2022
 Goksen Gorgulu
Fontend Engineer

A unique software mastery program with great mentors. I recommend this course to any mid-level software developer who wants to become an expert.

May 4, 2022
Martynas Kuznecovas
Front-end developer

Since joining his program I grew so much not just as developer, but as individual. I understood where I stand, where I need to be, and what I need to do.

Jul 6, 2022
Ergun Cuneyt

In the middle of the program, I was offered a new role with a 25% salary increase and after three months in the role, I had another 20% increase.

Jul 3, 2022
 Jaime Pinto
Fontend Engineer

They honestly give you the best of themselves and put all their effort to help you in whatever you need, in a technical and personal way. Every time I can, I still connect to those sessions because you can learn so much in there.

Jun 7, 2022

A Global Community

Join a group of like-minded software developers and take part in the Software Revolution!

Unlock your full potential

Fast and scalable hosting, advanced security, dedicated partnership, and much more.
Privacy Tip
This is some text inside of a div block.
This is some text inside of a div block.
This is some text inside of a div block.
Search off
This is some text inside of a div block.
Lock Clock
This is some text inside of a div block.
Dynamic Form
This is some text inside of a div block.
This is some text inside of a div block.
Send and archive
This is some text inside of a div block.
This is some text inside of a div block.
Display Settings
This is some text inside of a div block.
Text Rotation
This is some text inside of a div block.
History edu
This is some text inside of a div block.

The Stages Of Your Development

1. Software Mastery

For Junior & Mid-level Engineers
Personalized Training
Group Coaching
Dedicated Learning Platform
Continuous Feedback
Ready made cheat sheets

2. Software Excellence

For Senior Developers looking to level up
1:1 Mentoring
VIP Level of Service
The Blueprint to Technical Leadership
Proven Path To Principal/Architect
Premium offer not available to general public*

Codebase Basic


No credit card required
Unlimited hosted projects
Use custom fonts
Interactions & animations
100+ responsive templates
Global swatches
Unlimited hosted projects

Codebase Business


billed annually  •  cancel anytime
Unlimited hosted projects
Use custom fonts
Interactions & animations
100+ responsive templates
Global swatches
Unlimited hosted projects
team memberS

Meet the team

Dragos Nedelcu
Dragos Nedelcu
Senior Developer & Co-founder at theSeniorDev
Bogdan Nedelcu
Bogdan Nedelcu
Principal Engineer & Co-founder at theSeniorDev
Our Offices

Our Offices

Also referred to as the "Silicon Valley" of Germany, Berlin is home to many European Tech giants such as Zalando, Hello Fresh, and Delivery Hero.
This unique position in one of the world's most competitive places within the software industry gives us access to the best information in the sector.