5 Massive Red Flags to Watch for When Hiring a Freelance Developer

• The Nightmare Interview Scenario
• Know Your Enemy: The Excuse Generator
• The 5-Point Screening Checklist
• Stop Testing Code, Start Testing Character
• How to Protect Your Escrow

The Nightmare Interview Scenario

In late 2025, you are interviewing developers to build a custom booking dashboard. One candidate is incredibly enthusiastic. When you ask if they can integrate a complex, undocumented legacy API, they immediately reply, "Yes, no problem! I can do anything you need."

You are thrilled. Finally, an easy hire! You release the $1,000 upfront milestone.

Three weeks later, the dashboard is completely broken. When confronted, the developer shifts the blame: "I already spent 40 hours on this, it's not my fault the API is weird. You need to pay me for my time."

Here's the truth: You ignored the most critical red flag in hiring: The Desperate Yes-Man. In my experience interviewing hundreds of developers for US and UK startups, technical skills matter far less than behavioral red flags during the initial screening.

Know Your Enemy: The Excuse Generator

When you hire on open marketplaces, you aren't just looking for talent; you are actively dodging the Excuse Generator. This is a freelancer who masks their incompetence with a never-ending stream of external blame.

But it gets worse: It's never their code—it's "the theme," "the server," or "your requirements." Once they get your money into escrow, they will hold your source code hostage until you pay them to fix the bugs they created.

Read more: The 'UX Issue' Excuse: How Bad Developers Hide Critical Bugs

The 5-Point Screening Checklist

If you see even one of these during the interview or discovery phase, walk away immediately. Copy and paste this checklist into your hiring workflow:

1. [ ] Do they say "Yes" to everything? Pitch them a terrible, technically impossible idea (e.g., machine learning running offline on a 10-year-old iPhone). A real expert will say, "That's actually impossible, and here's why."
2. [ ] Did they ask clarifying questions? If they read a two-paragraph brief and immediately quote £5,000 without asking about user flow, they are an amateur.
3. [ ] Did they ask to go off-platform immediately? If they ask to bypass Upwork and be paid directly via wire transfer on Day 1, run. Only move off-platform with freelancers you trust.
4. [ ] Do they shift pre-emptive blame? Ask about a failed past project. If they say, "The client didn't know what they wanted," they lack accountability.
5. [ ] Do they refuse milestone estimates? If a developer demands 50% upfront for a massive, multi-month project and refuses to break the work into two-week deliverables, they are planning to disappear.

Stop Testing Code, Start Testing Character

Most hiring guides tell you to give developers a coding test. This is backward in the era of Generative AI. A developer who passes a coding test using ChatGPT but possesses a toxic, excuse-driven work ethic will still destroy your project.

Instead, look for the behavioral red flags that indicate a lack of professional maturity. You want a developer who acts like a technical partner, not a subordinate. Professional developers frequently contribute to open-source projects on GitHub because they care about community and code quality, not just a quick paycheck.

How to Protect Your Escrow

Hiring a freelancer is inherently risky. By watching for these five red flags, you can filter out the desperate amateurs and find the professional partners your business actually needs.

Never release a single dollar/euro/pound of escrow until you have fully vetted their communication style.

Read more: Why You Should Never Pay a Developer for Missing Their Own Deadline