There's a specific failure mode that shows up with a job application API. It works great in the demo, handles the three test cases you tried, and then six weeks into production it silently starts failing on a form it used to handle fine. Nobody notices until a candidate complains that their application never went through. That's not a hypothetical, it's the default outcome unless you know what to actually check before committing.
Here's what's worth evaluating, based on what separates the job application APIs built to last from the ones built to look good in a sales call.
Start with coverage, but ask how it's measured
Every job application API will tell you it "supports" a list of applicant tracking systems. The number that matters more is how that support is tested. A system that lists Workday as supported but hasn't run a real application through it in three months is telling you a fact that used to be true. Look for a live coverage checker rather than a static list, and ask directly whether adapters are tested against real submissions on an ongoing basis or just built once and left alone.
The Boring Project, for example, publishes a coverage checker where you type in an ATS name and get a straight answer, and states that anything missing becomes their backlog rather than yours. That framing matters. It tells you what happens the day you need an ATS that isn't supported yet, not just what's supported today.
Ask what comes back when a submission happens
A job application API that returns a plain "success" and nothing else is giving you almost no useful information. What you actually want is proof: a status that distinguishes between submitted, needs more input, and failed, plus something to show for it, like a screenshot of the confirmation page. Without that, you're trusting a black box with something that has real consequences for a real person's job search.
This is worth testing directly before you commit to anything. Send a real application through and see what the response actually contains. If it's a boolean, that's a red flag. If it's a status plus a receipt, that's infrastructure you can build a product on top of.
Find out what happens with a question it can't answer
Every application form eventually hits a screening question the API can't answer from the candidate's stored profile. "Are you willing to relocate?" "Do you require visa sponsorship?" These aren't fields to fill in with a best guess, they're decisions that affect whether a real person gets an interview or gets filtered out.
Ask directly: what does the system do when it doesn't know the answer? The honest answer is that it should stop and ask, returning something like a needs_input state, rather than fabricating a response to push the application through. Any provider that can't give you a clear answer to this question, or worse, treats guessing as a feature, is optimizing for completion rate over actual accuracy. That's the wrong thing to optimize for when the applications are real.
Ask about Workday specifically
If a job application API supports Workday, ask them how. It's the hardest platform in this category by a wide margin, multi-step, tenant-specific, sometimes requiring an account to be created before an application can even start. A provider that's honest about this will tell you it takes longer and involves more moving parts than a simpler ATS like Greenhouse or Lever. A provider that claims Workday is just as fast and simple as everything else is either not actually supporting it well, or not being straight with you about the difference.
Understand the cost model before volume changes it
Some job application APIs charge per seat, some per application, some bundle it into a flat platform fee. Think through what happens to your actual costs as usage scales up, not just what the intro pricing looks like at low volume. A per-application model, like The Boring Project's Managed Applies product, can make sense for a team with volume and no engineering bandwidth, while a direct API integration makes more sense for a team that wants full control and already has developers to build against it. Neither is universally right, but the wrong one for your situation gets expensive fast.
Check what they say about their own limitations
This might be the single most useful signal in the entire evaluation. Read the documentation section, if there is one, about what's genuinely hard. A provider willing to say "Workday is our largest adapter and it's slower" or "screening questions we can't verify get paused, not guessed" is telling you they've actually run this in production and hit the hard cases. A provider whose entire pitch is "it just works, effortlessly, every time" either hasn't hit those cases yet, or isn't telling you about them.
The short version
A job application API is infrastructure, not a feature toggle. Evaluate it the way you'd evaluate any infrastructure you're about to depend on: how it's tested, what it returns, what it does when it doesn't know something, and whether the people who built it are honest about where it struggles. The ones that pass all four are rare enough that when you find one, it's worth noticing.
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