Arjun Iyer

Signadot SmartTests - AI Powered Contract Testing

Catch contract violations on every Pull Request without writing contracts or mocks. SmartTests runs your code against real services side-by-side, AI learns from live traffic and intelligently scores diffs for relevancy. Pure confidence to merge code.

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Arjun Iyer

Huge thanks to @garrytan and @ycombinator for the hunt! 🙏

👋 Hey Product Hunt Fam! I'm Arjun, co-founder of Signadot. Excited to introduce SmartTests—a new way to catch API breaking changes without maintaining traditional contracts!

📜 Why we built SmartTests

After talking to hundreds of engineering teams, we discovered something surprising: automated testing was an afterthought for most microservices teams.

Many had looked into contract testing but adoption was shockingly low. The problem? Traditional approaches put all the burden on developers—writing contracts, maintaining mocks, integrating with CI systems. Too much toil.

We decided to flip this: what if AI could handle the heavy lifting? SmartTests automatically detect breaking API changes by comparing real traffic—no contracts or mocks to maintain.

🧐 The problem with traditional contract testing

Current approaches create development friction:

- Manual contract maintenance that's time-consuming and goes stale quickly

- Mock-based testing that misses real-world issues

- Team coordination overhead that slows everyone down

🤯 How SmartTests work differently
SmartTests compare real API responses between your current and new code versions running side-by-side. AI-powered analysis spots only the changes that actually matter.

✅ Simple tests in Starlark - focus on critical API calls, not contract files

✅ Smart AI diffs - highlights meaningful changes, reduces noise

✅ Runs on Pull Requests - fast feedback before merging code

🥰 Try it out!

1. Sign up free - create your first SmartTest in under 2 minutes!

2. 20% off our Team plan for a whole year for PH users ❤️ - email us at info@signadot.com

What questions do you have about testing microservices? Would love to hear your thoughts!

Masum Parvej

@garrytan  @ycombinator  @arjuniyer The Starlark format is easy to read and quick to test.
How does SmartTests deal with dynamic fields like timestamps and session IDs in API responses?

foxish

@masump I'm foxish, co-founder and CTO of Signadot. Thanks for the question! What we do is to learn from the traffic and classify the diffs we find based on their relevance (https://www.signadot.com/docs/concepts/smart-tests-and-jobs#smart-diff). The idea is that things like timestamps and session IDs change very often and independently of the test, so they quickly become "low relevance" findings.

Alex Cloudstar

Hey Arjun! SmartTests sounds like a game-changer for microservices teams. The burden of traditional contract testing definitely needs an innovative shake-up, and your AI-driven approach to reducing dev toil is very exciting. Kudos to you and the team for tackling this challenge! 🙌

Arjun Iyer

@alex_cloudstar appreciate your kind words. Would be great if you could sign up and give us your feedback thx

Kay Kwak
Launching soon!

Exactly in microservices team, even automated testing often gets pushed aside because of how resource intensive it is. If Signadot can solve these kinds of problems, that would be amazing! Congrats on the launch!

Arjun Iyer

@kay_arkain couldn’t agree more! Would be great if you could try SmartTests and give us your thoughts. Thanks

Malka Parveen

Was talking to a colleague last week about the exact issue this solves. Showed it to them today and they’re just as curious as me to try it on our dev branches.

Arjun Iyer
@malka_parveen that’s terrific to hear! Feel free to join our slack community.
Supa Liu

Its AI learns from live traffic to smartly highlight relevant code changes, giving devs real confidence to merge without second-guessing. Truly a next-level testing boost!

Arjun Iyer
@supa_l appreciate your vote of confidence!
Arjun Iyer
@supa_l thanks
Shivanshu Raj Shrivastava

Congratulations on the launch! 🚀 It looks like a real time-saver. Also it could be potentially be useful for sharing diffs with the UI team whenever there's some intentional change in API


Arjun Iyer

@shivanshu1333 Thanks for the screenshot :-)

Najish

Had no idea AI could be used this way in testing. Most of what I’ve seen until now was all about generating tests, not scoring actual traffic.

Nimesha Jinarajadasa

Really impressive approach—catching contract violations without writing mocks or contracts saves tons of effort. Running side-by-side against real services and scoring diffs based on live traffic makes this feel like a smarter, safer CI step. This could seriously boost confidence when merging PRs.

Arjun Iyer
@nimesha_jinarajadasa thanks appreciate it
Vivek Kumar

@arjuniyer SmartTests sound like a real boost for microservices teams. AI-powered way to cut down on all that 'dev toil' is super cool.

Big props to you and the team for tackling this! 🚀

Arjun Iyer
@v1vek thanks!
Kamruzzaman Mayed

Great work Arjun! SmartTests looks like a game-changer for dev teams working with microservices. You should consider listing it on Aixyz .Co — it’s free and helps more people discover innovative AI tools like yours. Keep it up!

Arjun Iyer
@kamruzzaman_mayed thanks. Will take a look.