How do you choose between test automation tools and justify the decision?
60-second answer
I run a structured evaluation rather than following trends. First I list requirements: application technology, browsers and devices, languages the team knows, CI integration, parallelism, reporting, licensing and support, community and hiring market, and long-term vendor risk. I shortlist two or three tools and build the same proof of concept with each, covering a hard real scenario, measuring stability, speed and developer experience. I document the decision as an ADR with trade-offs, and plan migration or coexistence if we're replacing something. The cheapest tool that the team will actually maintain usually wins.
Explanation
Evaluation matrix criteria (weighted): fit for tech stack, team skills, speed and reliability, debugging tools, ecosystem, cost (licence + infra + training), vendor lock-in, scalability, security and compliance, community.
Common decisions:
- Selenium vs Playwright vs Cypress for web.
- Open source vs commercial (Tosca, UFT, Katalon, testRigor).
- Build vs buy for test management and reporting.
- Device cloud vs own device lab.
Example
A bank with a .NET stack and a mostly manual team chose Playwright .NET over Selenium C# after a two-week PoC showed 40% fewer waits and built-in tracing, with a plan to upskill through pairing.
Sample code
Criterion (weight) Selenium Playwright Cypress
Tech fit (3) 4 5 4
Team skills (3) 5 4 3
Reliability/speed (3) 3 5 4
Debugging (2) 3 5 5
Multi-browser (2) 5 4 3
Cost/lock-in (2) 5 5 4
Weighted total 63 71 58