Performance Testing Specialist (m/f/d) at Sofico · Zwijnaarde

What the job is about

As a Performance Testing Specialist, you ensure the performance, stability, scalability, and reliability of our automotive software solutions through both proactive and reactive performance engineering. This includes identifying issues before they surface as well as diagnosing and resolving problems reported by internal teams or customers. You work across the full technical stack, conducting performance analysis on database (DB), API, and user interface (UI) layers.

Your responsibilities:

· Perform proactive performance testing across DB, API, and UI layers to identify potential bottlenecks before they impact users.

· Execute reactive performance investigations when issues arise, analyzing behavior across the full stack to quickly isolate and resolve root causes.

· Conduct performance and load testing to validate system scalability and resilience under stress.

· Provide technical guidance to development and product teams for improving performance at structural and code levels.

· Execute load and stress tests at DB, API, and UI levels to ensure end‑to‑end system resiliency.

· Assist customers in identifying, diagnosing, and resolving performance‑related issues using both proactive guidance and reactive troubleshooting.

· Manage and maintain dedicated performance/load environments to ensure accurate simulations at different stack layers.

· Analyze and optimize batch jobs for stability and throughput across varying load conditions.

Your interests and skills

You have a passion for solving complex performance challenges and improving software efficiency, combined with a critical and analytical mindset.

Requirements:

· Hands-on experience with DB, API, and UI performance testing & optimization.

· Strong analytical skills for identifying bottlenecks.

· Accuracy and diligence in fine-tuning complex systems.

· Collaboration skills for cross-functional teamwork.

· Proactive problem-solving mindset.

· Strong communication for translating performance insights.

· Eagerness for continuous learning.

· Experience in tools like JMeter, K6, Dynatrace, … is essential.

· ISTQB CTFL 4.0 certification mandatory, ISTQB CT-PT certification recommended

What we offer you

• Competitive salary package
• Group and hospitalization insurance
• Additional benefits: bike leasing and flexible working hours

Join an international, multicultural company with more than 35 years of experience, which doubles in size every 5 years. We encourage a horizontal, open corporate culture where career development and personal growth are central. You benefit from a comprehensive 6-month onboarding, including a dedicated job coach, and receive ongoing learning opportunities. Participate in fun team activities such as after-work drinks, barbecues, family days, and company weekends. Additionally, you work in a modern and easily accessible office, equipped with charging stations for electric cars and bikes, as well as free shared bikes.