In This Blog

TL;DR

  • Code challenges are a common part of software developer and database administrator interviews.

  • The most common mistakes include failing to read requirements, writing overly complex code, not solving the problem completely, poor formatting, and ignoring best practices.

  • Hiring managers often evaluate code quality, readability, maintainability, and problem-solving ability just as much as technical correctness.

  • Simple, well-structured solutions usually perform better than overly complicated ones.

  • Preparation, communication, and attention to detail can significantly improve your chances of success.

For many software developers, database administrators, and technical professionals, the words "code challenge" can immediately raise stress levels.

Technical interviews are already challenging enough. Adding a coding exercise to the process can make candidates feel even more pressure.

The good news is that code challenges are designed to help employers understand how you think, solve problems, and approach real-world technical work. They're not meant to trick you.

At Emergent Software, we use take-home code challenges as part of our software developer and SQL Server DBA interview processes. Over the years, we've reviewed countless submissions and noticed several recurring mistakes that often prevent otherwise qualified candidates from moving forward.

To better understand these patterns, we spoke with two of our technical leaders who regularly review code challenges:

  • Mike Allen, Principal Software Engineer

  • Kevin Martin, Director of Database Development and Administration

Here are five of the most common code challenge mistakes they see and how you can avoid them.

Mistake #1: Not Fully Reading the Requirements

The most common mistake often happens before a candidate writes a single line of code.

Many candidates skim the requirements and jump straight into development.

That approach creates unnecessary risk.

Before starting any coding exercise, take time to read the entire challenge carefully. Understanding the full scope of the problem helps you:

  • Identify key requirements

  • Avoid missing functionality

  • Plan your approach

  • Estimate complexity

  • Identify areas that may require clarification

Technical interviews can create anxiety, and it's natural to want to start coding immediately. However, slowing down and understanding the problem first often saves significant time later.

A few extra minutes spent reviewing requirements can prevent hours of rework.

Mistake #2: Using Hard-to-Follow Logic

Another common issue occurs when candidates create solutions that are technically functional but difficult to understand.

Complexity is not always a sign of skill.

In fact, many hiring managers prefer simple, elegant solutions over unnecessarily complicated ones.

Mike Allen explains it this way:

"Some developers do their challenge as if it's an enterprise-grade project and I don't ding them for it. It's more of a problem when the code is convoluted and hard to follow."

Remember that other developers may eventually need to maintain your code.

Good solutions demonstrate:

  • Clear organization

  • Logical flow

  • Readable structure

  • Appropriate complexity

Your goal is not to impress reviewers with complexity. Your goal is to solve the problem effectively while demonstrating sound engineering practices.

Mistake #3: Not Solving the Entire Problem

Surprisingly, some candidates submit code that simply doesn't solve the problem they were asked to solve.

This usually happens for one of several reasons:

  • The requirements weren't fully read

  • The candidate misunderstood the prompt

  • Clarifying questions weren't asked

  • Time management became an issue

Regardless of the reason, incomplete solutions create major concerns during the review process.

If part of a challenge is unclear, ask questions.

Most employers would much rather answer a few clarification questions than review a submission that misses important requirements.

Strong candidates demonstrate that they fully understand the problem before attempting to solve it.

Mistake #4: Submitting Sloppy or Poorly Formatted Code

Code formatting may seem minor compared to functionality, but it matters more than many candidates realize.

Kevin Martin frequently notices formatting issues in SQL submissions.

"A lack of code formatting shows a low level of craftsmanship for a candidate's work."

For SQL professionals, Kevin recommends learning proper formatting habits early, including:

  • Consistent casing

  • Proper indentation

  • Logical spacing

  • Readable query structure

On the software development side, Mike notes that sloppy formatting, excessive copy-pasted code, and inconsistent whitespace often create red flags during reviews.

Well-formatted code improves:

  • Readability

  • Maintainability

  • Collaboration

  • Source control history

Review your submission before turning it in. Small formatting improvements can have a surprisingly positive impact.

Mistake #5: Ignoring Industry Best Practices

The final common mistake is failing to demonstrate familiarity with modern development practices.

Technical interviews are not just about whether code works.

Reviewers also evaluate how candidates approach software development and whether they understand current industry standards.

For SQL professionals, Kevin emphasizes the importance of learning established T-SQL best practices and continuously improving technical skills through ongoing education.

For software developers, Mike recommends demonstrating knowledge of:

  • Modern design patterns

  • Current frameworks and technologies

  • Maintainable architecture

  • Industry-standard development approaches

Mike explains:

"Design patterns make it easier to follow the flow of your code and collaborate with other developers. If you choose to use older technologies, you'll need to be able to defend your decision."

Technology evolves constantly.

Strong candidates show that they actively invest in learning and staying current.

How to Prepare for a Technical Code Challenge

While every employer uses different interview processes, most technical code challenges reward the same core behaviors.

Before submitting your solution:

  • Read the requirements carefully

  • Ask clarification questions when necessary

  • Focus on solving the actual problem

  • Keep your code clean and readable

  • Follow modern development practices

  • Review your submission before turning it in

Remember that reviewers are not simply evaluating whether your code compiles.

They're evaluating how you think, communicate, and approach technical challenges.

A thoughtful, well-organized solution often performs better than a highly complex one.

If you're interested in joining a team that values craftsmanship, collaboration, and continuous learning, visit our careers page.

How Emergent Software Can Help

Emergent Software helps organizations build and support high-performing technology teams through custom software development, database administration, cloud services, and staffing solutions. We invest heavily in technical excellence, mentorship, and continuous learning to ensure our teams deliver exceptional results for clients while continuing to grow professionally. If this sounds familiar, we can help.

Final Thoughts

Technical code challenges can feel intimidating, but they don't need to be.

Most candidates who struggle during code reviews aren't failing because they lack technical ability. They're often making avoidable mistakes involving communication, preparation, formatting, or problem understanding.

By focusing on clarity, craftsmanship, and thoughtful problem-solving, you'll put yourself in a much stronger position to succeed in technical interviews.

And who knows? Your next code challenge could be the first step toward your next great career opportunity.

Frequently Asked Questions

What is a code challenge in a job interview?

A code challenge is a technical assessment used by employers to evaluate a candidate's programming, database, or problem-solving abilities. The challenge may be completed during an interview or as a take-home assignment. Employers use code challenges to better understand how candidates approach real-world technical problems. The goal is often to evaluate both technical skill and thought process. Many software development and database administration roles include some form of coding assessment.

What do hiring managers look for in a code challenge?

Hiring managers typically evaluate more than just whether the solution works. They often assess readability, maintainability, organization, formatting, design decisions, and overall problem-solving ability. Communication and attention to requirements also play a major role. Strong candidates demonstrate technical competency while keeping their solutions practical and understandable. The quality of the code often matters as much as the final result.

Should I ask questions during a code challenge?

Yes. If any part of the requirements is unclear, asking clarifying questions is usually encouraged. Employers generally prefer candidates who seek clarification over those who make incorrect assumptions. Asking questions demonstrates communication skills and attention to detail. It also helps ensure you solve the correct problem. Good communication is an important part of most technical roles.

How important is code formatting?

Code formatting is very important because it affects readability, maintainability, and collaboration. Well-formatted code is easier for other developers and reviewers to understand. Poor formatting can create negative impressions even when the solution works correctly. Consistent indentation, naming conventions, spacing, and structure all contribute to code quality. Many organizations view formatting as a reflection of technical craftsmanship.

Should I use advanced techniques to impress interviewers?

Not necessarily. Overly complex solutions can sometimes create more problems than they solve. Most reviewers prefer solutions that are clean, understandable, and appropriate for the challenge. Complexity should only be introduced when it provides meaningful value. The goal is to demonstrate good judgment and sound engineering practices. Simplicity is often a strength, not a weakness.

How can I prepare for a software developer code challenge?

The best preparation includes practicing coding problems, reviewing modern development practices, improving code formatting habits, and strengthening problem-solving skills. Candidates should also become comfortable reading requirements carefully and explaining their decisions clearly. Familiarity with design patterns, testing approaches, and current technologies can be helpful. Consistent practice tends to improve both confidence and performance. Preparation is often the difference between a stressful experience and a successful one.

Author

Jacqui Vreeland