A mobile developer is a programmer who writes applications for mobile devices. These include not only smartphones and tablets, but also smartwatches, fitness trackers, e-readers, GPS navigators and all other things with a screen and keyboard that you can carry with you. More links: https://triare.net/service-mobile-apps/

Web applications are becoming more pervasive and increasingly complex, making them critical to almost all large Internet companies.
Each application should be handled not only by a developer but also by a QA engineer.
Testing is a method to evaluate the security of a computer system, a smart contract or a network by simulating an attack.
A smart contract penetration test aims to evaluate the security of a web application. The process involves active analysis and search for smart contract vulnerabilities, application weaknesses and technical flaws through which a hacker can gain access to critical information.
https://hacken.io/researches-and-investigations/smart-contract-vulnerabilities/
Therefore, penetration testing is essential.

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