Certified Tester Advanced Level Agile Technical Tester (CTAL-ATT)

Overview: The ISTQB® Advanced Level Agile Technical Tester (CTAL-ATT) certification provides a thorough introduction to the technical testing skills which are fundamental in organizations using an Agile development approach. These skills include testing and agile techniques, test automation approaches, and continuous deployment and delivery.
To gain this certification, candidates must hold either a valid Certified Tester Foundation Level certificate 4.0 (CTFL 4.0) certification OR a valid Certified Tester Foundation Level certificate prior to the CTFL 4.0 plus a valid Certified Tester Foundation Level Agile Tester certificate, and have sufficient practical experience. Refer to the relevant Exam Board to determine any specific practical experience criteria.. (Source ISTQB.org)

Certified Tester Agile Test Leadership at Scale (CT-ATLaS)

Overview: The ISTQB® Agile Test Leadership at Scale (CT-ATLaS) certification focuses on how to organize and improve quality and testing across multiple teams in an agile organization. It also covers how to approach quality and testing at a strategic level in order to achieve higher business agility in an organization. CT-ATLaS covers how to scale testing and quality assurance efforts by fostering a quality mindset and culture across the organization. This includes shifting from a traditional test management approach typically used in sequential development models to a quality assistance approach which builds on Lean and Agile principles and values. It also includes how to adopt common Lean and Agile techniques and processes for analyzing and solving problems and how to use them to improve testing and quality in the organization. (Source ISTQB.org)

Certified Tester Foundation Level Agile Tester (CT-AT)

Overview: The ISTQB® Foundation Level Agile Tester (CTFL-AT) certification provides the key testing skills necessary to successfully contribute to an Agile project. CTFL-AT covers agile testing in alignment with the principles of agile software development as outlined in the Agile Manifesto. A tester on an Agile project will work differently than one working on a traditional project. Testers must understand the values and principles that underpin Agile projects, and how testers are an integral part of a whole-team approach together with developers and business representatives.
To gain this certification, a candidate must hold the Certified Tester Foundation Level certificate (Version 4 or earlier). However, since Agile testing specificities are addressed in CTFL Syllabus version 4, it does not appear to be useful for a candidate to take the AT exam if he/she is CTFL 4 certified. (Source ISTQB.org)