The Skills Junior Developers Are Missing (A Practical Checklist)

The skills most junior developers are missing have little to do with writing more code — they are collaboration skills: using git as more than a save button, writing tests for their own work, handling code review without taking it personally, and communicating clearly in writing. These are the skills that separate a hireable junior from one who can solve algorithm problems but struggles to work inside a real engineering team.

What skills do junior developers actually lack?

Most coursework and coding bootcamps optimize for the wrong thing: writing correct code alone, under no time pressure, with no one else's code to coordinate with. Real engineering work is collaborative — code sits in a shared repository, gets reviewed by other people, has to keep working after you change it, and gets discussed in writing more often than in person. The gap isn't ability to code; it's the surrounding habits that make code safe to merge, easy to review, and trustworthy months later.

• Git workflow — branching, commit hygiene, and resolving conflicts calmly.
• Testing — writing tests for your own code, not just making it run once.
• Code review — explaining your reasoning and accepting feedback without defensiveness.
• Written communication — bug reports, PR descriptions, and async status updates that stand on their own.

How well do you actually understand git?

Knowing the commands (`add`, `commit`, `push`) is not the same as understanding the workflow. A junior who commits directly to the main branch, writes commit messages like "fix" or "update stuff", and freezes the moment a merge conflict appears is a liability on a team, regardless of how good their code is. What actually matters is working in a feature branch so unfinished work never blocks anyone else, writing commit messages that explain why a change was made (not just what changed), and being able to open a conflicted file, read both versions, and resolve it deliberately instead of guessing and hoping it still runs.

Have you ever written a test for your own code?

A surprising number of junior developers can write code that works and have never once written a test for it. That's a bigger red flag than it sounds — it usually means someone has only ever verified the happy path, and hasn't built the habit of asking "what breaks this?" A developer who writes even a few basic tests is demonstrating something more valuable than syntax knowledge: they're thinking about edge cases, empty inputs, and wrong assumptions before a user or a teammate finds them first. It doesn't require mastering a testing framework — it requires the instinct to check your own work before someone else has to.

Can you give and receive code review well?

Code review is where a lot of junior developers stumble, on both sides of it. Giving useful review means leaving specific, actionable comments and being able to explain the reasoning behind a suggestion rather than just stating a preference. Receiving review means treating a challenged decision as a technical question, not a personal attack — asking a clarifying question before getting defensive, and being able to say "good catch, I'll fix that" without it feeling like a loss. Teams notice this fast, because it directly predicts how painful or smooth it is to work with someone day to day.

Is your written communication clear enough to work async?

A surprising share of real engineering work happens in writing, not in meetings or live coding: a bug report that either saves someone an hour or wastes it, a pull request description that explains what changed and why, a short async update that says exactly what's blocking progress. This is chronically underrated by students who spend all their prep time on algorithms and none of it on writing a clear paragraph. A bug report that says "the button is broken" is nearly useless; one with steps to reproduce, expected behavior, and actual behavior gets fixed same day.

How do you build these skills before you have the job?

• Open a handful of pull requests on a real open-source project — the review process there teaches git workflow and code review at once.
• Add a basic test suite to a personal project, even a small one, and write down the edge cases you thought to test.
• Practice writing a PR description and a bug report for your own side projects as if a stranger had to act on them with zero extra context.
• Ask a peer to review your code and genuinely apply at least one piece of feedback you disagree with, to build the habit of separating ego from output.