The coding platform where you find the bugs. Write pytest. Kill mutations. Prove your QA skills. Built for QA engineers and SDETs. Free to start.sdetcode.com sdetcode.comJoined March 2026
We ran an AI through 670 mutation testing challenges (195 sessions):
- Type bugs: 28.6% kill rate
- Validation bugs: 46.2%
- Logic bugs: 47.5%
- Boundary bugs: 63.8%
- Overall: 51.8%
That 28.6% number is not a typo.
sdetcode.com
QA engineers have no LeetCode equivalent.
LeetCode trains you to write code. QA work is the opposite — finding what's wrong with code someone
else wrote.
Mutation testing fills that gap:
dev.to/sdetcode/why-m…
100% line coverage ≠ your tests catch bugs.
A function can execute every line and still let an off-by-one ship.
The real metric: kill ratio — what % of injected bugs your tests detect.
That's mutation testing.
No account. No setup.
Just go to sdetcode.com and write a pytest test right now.
3 mutation testing challenges, free, in your browser.
If you've never killed a mutant before — this is the fastest way to start.
Something is launching tomorrow for QA engineers.
No algorithms. No linked lists.
Just bugs. Hidden in real code. Waiting for your tests to find them.
Tomorrow, 12:01 AM PT.
#SDET#MutationTesting#QAEngineering
How do you measure test quality?
A) Code coverage
B) Mutation score (kill ratio)
C) "It works on my machine"
D) We don't
Be honest.
#QAEngineering#SDET#SoftwareTesting
How do you measure test quality?
A) Code coverage
B) Mutation score (kill ratio)
C) "It works on my machine"
D) We don't
Be honest.
#QAEngineering#SDET#SoftwareTesting
The AI Benchmark is something I'm proud of.
You solve a challenge. Then you see how GPT-4o-mini, GPT-4o, and GPT-5.2 performed on the same problem.
If you catch a mutation that an AI missed — that's a real, measurable skill signal.
Introducing SDET Code: the first coding challenge platform built specifically for QA Engineers.
Write pytest tests. Kill code mutations. Prove your skills.
655+ challenges. AI coaching. Runs in your browser. Free to start.
sdetcode.com
6K Followers 1K FollowingSports columnist/assoc editor @Hearst CT Media | https://t.co/KeOS0RgV2P | Pizza chef | Great golfer 🙄 | Fan of 80s wrestling, banana bread and my 25-lb cat
6K Followers 495 FollowingThe Hartford Courant's UConn Insiders take you between the lines and on the beat with the state's premier college programs.
Instagram: https://t.co/6PjXWQN9P7
6K Followers 359 FollowingThe ISTQB ® is the leading authority for software testing certification world-wide, promoting the best practices for software testing
2K Followers 508 FollowingThe best developer experience for load testing | #opensource w/ CLI interface | built in #GoLang, uses #JavaScript for scripting | we're a @Grafana Labs Company
6K Followers 1K FollowingWelcome to #QAJedi squad! Here we're sharing insights, news, #QAhumor, ideas to grow, and even more stuff on #softwaretesting. Let the quality be with you!
105K Followers 1K FollowingBuild with AI or code, deploy instantly. One platform built for agent experience (AX).
Need support? https://t.co/bEIBAUzAwR
16K Followers 6K FollowingSmartBear delivers application integrity for modern tech stacks, ensuring continuous, measurable assurance that software works as intended.
21K Followers 874 FollowingWhen testing is easy, developers build better things faster and with confidence.
Join 25k testing professionals at CypressConf 2026: https://t.co/9IV29G78U6 🚀
46K Followers 435 FollowingThe nations source for high school 𝙜𝙞𝙧𝙡𝙨 basketball, coverage, rankings & analysis. | @pghcircuit | Text HOOPS to (612) 509-9992 for more ✨
17K Followers 3K FollowingA true driving force in the software testing and quality domain. I’m a tester, automator, speaker, writer, teacher, strategist, leader, and a friendly human.