Junior vs Senior Developers, and Why They Both Matter

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Junior vs Senior Developers, and Why They Both Matter

Any developer looking for a job is bound to come across postings for a “senior developer” or “junior/entry-level developer” —  perhaps without really understanding the difference between the two. At the same time, many hiring managers seeking a developer may not understand the difference either, and they may assume by default that they always need a senior developer to help solve their problems. 

When it comes down to it, in the battle of junior vs. senior developer, which one is most qualified to take on the big job? Really, the core difference between senior and junior developers is that senior developers are in general more skilled in their field than junior developers. But right off the bat, I want to bust a couple of big myths between junior and senior developers:

Being a senior developer doesn’t mean that you’ve had a longer career as a programmer than a junior developer, nor does it mean that a senior developer has to be older than a junior developer.


It all comes down to skill, 100%. How do you get that skill? Well, career length is usually a big player in that, which is why many senior developers have been coding longer than junior developers — but it also comes down to passion and drives. A developer who spent 4 years getting by in Computer Science classes in college will have skills, but there’s a good chance that someone who has taught themselves programming for over 2–3 years might be considerably more talented, just because they had more passion and dedication while learning during that time.

Being a senior developer doesn’t mean you have to be an expert in everything.

No one is an expert at everything; however, it is true that a senior developer should be reasonably good at at least one language. That could be JavaScript, C#, Ruby, Java, R  —  it doesn’t matter because, under the hood, most of these languages use similar concepts, and understanding those concepts is what’s important. But no, you certainly don’t have to be a jack-of-all-trades to be considered senior-level.

Let’s dig deeper: what does it really mean to be a senior vs junior developer?


I would expect a senior developer to be able to completely develop an application entirely on their own. And in all honesty, that’s where I draw the line. I’m purposely being vague with my use of “application” there because that can mean different things in different fields of programming. Notice how I never said that senior developers wouldn’t have questions. Every developer has hundreds of questions every single day, and that never changes no matter how skilled you get. What being a senior developer really comes down to is knowing how to ask the right questions and then taking actions based on those questions. Here’s a sample thought process that a senior-level developer might work through.

“Hmm, I’ve been tasked to build a web application in Python using Django, and I don’t know Django; I barely know Python! But I do know C#, which is an object-oriented language like Python, and I do know ASP.NET MVC, which follows similar patterns as Django, so I have a solid foundation to start with. I’ll read the docs on how to get started with Django, watch a few tutorials, and go from there.”


See  —  never in that thought process was there a sense of “I’m lost and don’t know where to go from here.” That’s what being a senior developer means. You won’t ever have all the answers, but you’ll know the questions to ask and how to learn more to be able to accomplish your tasks. Sometimes that does involve asking other developers for help, but that’s never the only option you have.

Let’s move onto how this compares with being a junior developer.


As a junior developer, you’re new to the world of coding  —  but you do need a base foundation of skills. Someone who just decided that they want to start coding isn’t automatically a junior developer. You need to understand the fundamentals such as variables, loops, functions, conditionals, data types, etc.  —  and how to actually use them to accomplish tasks.

A junior developer should be given small to medium-sized programming tasks from their superiors with the expectation of accomplishing them, assuming that they are provided the necessary resources (i.e. documentation, coworkers, etc.). I would not expect a junior developer to completely solo a project, and I would expect them to work directly with a senior developer to a large extent so that they could work through code reviews and other collaborative learning experiences together.

Where junior developers really shine is the ability to take the frequent, uninteresting, and often annoying tasks off of the shoulders of senior developers so that the senior developers can focus more on complex tasks, such as architecting new projects, building data persistence layers, translating programming progress to higher-ups, deploying applications, etc. 

To junior developers, the small tasks they’re given aren’t annoying at all; in fact, they’re very important in the growth of a junior developer. They allow the developer to latch onto something small that they feel comfortable “owning,” which helps them not only learn more skills but also build confidence as a developer.

Junior developer salaries are also significantly lower than those of senior developers so that means it costs less to the business to have these less technically challenging tasks performed by junior developers instead of senior developers.


When you’re out in a workshop, you don’t need a power drill for everything; sometimes, a simple screwdriver will work. Likewise, with programming, when it comes down to hiring a junior vs. senior developer, each has their own strengths and weaknesses  —  and understanding when and how to use each is the key to forming a strong developer community within your organization.

Clevyr builds cutting-edge, scalable technology software solutions, including artificial intelligence for IT operations, digital twinning, predictive analytics, and cognitive computing — plus much more! Check us out at clevyr.com or drop us a line at hello@clevyr.com.

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