ISTQB® Specialist Trainings – Your Path to Becoming a Testing Expert

What are ISTQB® Specialist certifications, and when are they worthwhile?

ISTQB® certifications are divided into three levels: Foundation as an entry point, Advanced as a professional qualification for experienced testers, and Specialist as a topic-specific specialization. Specialist certifications are not another hierarchical level—they are positioned horizontally alongside the Advanced level. This means you can pursue Specialist certifications right after completing the Foundation level, without having to go through the entire Advanced track. In practice, however, most Specialist candidates are experienced testers with several years of professional experience who have consciously chosen a specific area of expertise. You can find more basic information about ISTQB levels in our overview of the ISTQB® Syllabus.

Specialist certifications are particularly worthwhile if you work in an industry or with a technology for which a relevant certification is available—and if you want to set yourself apart from generalists. For example, an automotive tester with a CT-AuT certification has a clear advantage in the OEM and supplier market over a general Foundation-level tester. A tester with a CT-AI certification is measurably more attractive to AI-intensive startups and corporations. In terms of salary, Specialist certifications typically lead to a premium of 5,000 to 15,000 euros per year, depending on their rarity and market demand.

ISTQB® Specialist Certifications at a Glance

CT-AI: Testing AI Systems

The ISTQB® CT-AI is aimed at testers who test AI-based systems themselves—that is, machine learning models, computer vision applications, and NLP systems. The course covers the specific quality dimensions of AI (bias, fairness, robustness, explainability), the methodological differences from traditional testing, and the practical validation of ML pipelines. Relevant for companies that develop their own AI products or AI-based products, or that use AI in regulated industries.

CT-GenAI: Testing with Generative AI

The ISTQB® CT-GenAI is the sister course to CT-AI. While CT-AI focuses on testing AI systems, CT-GenAI teaches you how to actively incorporate generative AI tools (LLMs such as GPT or Claude, prompt engineering, and LLM-supported test infrastructure) into your own testing process. The five modules cover prompt engineering, risk management for GenAI, integration into test infrastructure, and organizational adoption. CT-GenAI is currently one of the fastest-growing ISTQB certifications worldwide.

CT-AuT: Automotive Software Tester

The Automotive Software Tester certification is specifically tailored to the automotive industry. It covers standards such as ISO 26262, ASPICE, and AUTOSAR, as well as typical automotive-specific testing methods (e.g., back-to-back testing, MC/DC, and MiL, SiL, and HiL testing). For E/E testers at OEMs, Tier 1 suppliers, or software companies who test embedded software systems, communication bus systems (CAN, LIN, FlexRay), or other automotive-specific system components, the CT-AuT certification is standard in the industry and often a prerequisite for employment.

CT-MAT: Mobile Application Testing

The ISTQB Mobile Application Testing certification covers the specific characteristics of mobile applications: native iOS/Android testing, hybrid apps, cross-platform frameworks, device diversity, network conditions, and app store release processes. It is relevant for anyone who tests mobile apps—and has become a widely sought-after skill set, as the “mobile-first” trend shows no signs of slowing down.

CT-STE: Security Test Engineer

The ISTQB Security Test Engineer certification qualifies you in security testing: vulnerability analysis, penetration testing methods, OWASP Top 10, threat modeling, and security testing strategies. The certification is in high demand due to EU directives (NIS2, DORA, Cyber Resilience Act) and growing security requirements. In terms of salary, CT-Security is among the highest-paying specialist certifications.

Other Specialist Certifications

The ISTQB® offers several other Specialist certifications, but we won’t describe them in detail here due to their small target audience. These include, for example,  CT-QDO (Quality in DevOps), CT-MBT (Model-Based Tester), CT-TAS (Test Automation Strategy), CT-ATLaS (Agile Leadership at Scale), CT-AcT (Acceptance Testing), CT-PT (Performance Testing), CT-UT (Usability Testing), CT-DAT (Digital Accessibility Testing), CT-FT (Finance Testing), CT-Game (Game Testing), and CT-GT (Gambling Tester).

Which specialist certification fits your career path?

As a rule of thumb: Choose a Specialist certification that fits your current or desired field of work—don’t just go for the highest one across the board. Outside the automotive industry, a CT-AuT is only useful for those who also work with MiL, SiL, or HiL, or who want to gain an understanding of how industry-specific standards influence the work of testers. A CT-STE, on the other hand, is in demand in almost every safety-critical environment. If you’re unsure, start with CT-AI or CT-GenAI, because the AI trend is reaching virtually every testing field.

Specialist Certification as In-House Training

For teams with multiple testers, in-house training is usually the most efficient option. We bring the training to you—either as a traditional in-person session on-site or as a live online training course. The advantage: All participants work with the same project experience and the same examples from your company’s day-to-day operations. The course content can be tailored to your specific priorities—for example, CT-AI with a focus on your specific ML models, or CT-AuT with your concrete embedded stack examples.

From an organizational standpoint, in-house training also saves on travel costs and downtime, since no one has to travel to off-site locations. We come to you or join you remotely—with the same quality as in open training sessions. Contact us if you want to get an entire team up to speed at the same time.

Here’s how a Specialist training course at trendig works

All Specialist training courses at trendig follow a proven format. The duration is typically three to five days—depending on the certification. The content is divided into theoretical fundamentals, practical exercises based on real-world (tool) scenarios, and exam preparation. The exam takes place on the last day; it’s multiple-choice and optional. The exam fee is billed separately from the training. Our pass rates are significantly above the ISTQB average—thanks to targeted exam simulations and the practical focus of the exercises.

Before the training, we’ll work with you to ensure your prior knowledge is sufficient: the ISTQB requires the Foundation Level. After the training, we’ll stay in touch with you and support you in applying what you’ve learned in your projects—so you’ll receive not only a certificate but also long-term support. You can find more about exam preparation and pass rates in our exam preparation blog.

Conclusion: Specialist Certification as a Career Booster

ISTQB® Specialist certifications aren’t mandatory, but they’re the clearest way to set yourself apart from generalists in the market. In a world where software quality is becoming increasingly complex—driven by AI, automotive transformation, security compliance, and mobile-first trends—specialists are in higher demand than ever. Those who choose the right Specialist certification now will position themselves in the top third of the market for the next five years.

At trendig, we’ll guide you along this path—whether as an individual through open-enrollment training or as a team through in-house training. Contact us, and together we’ll determine which Specialist certification will benefit you the most.