qa English-speaking jobs in Leidschendam

Cottonwood Technology Fund seeks a technical intern to support investment activities, including scouting opportunities, analyzing market trends, and preparing investment memorandums.

Full Stack Developer (MERN Stack) to design, develop, and maintain SaaS platform. Collaborate with product, design, and engineering teams to build features. 5+ years experience in MERN stack required.

Leads product strategy, roadmap, and organization for a Marketing Measurement SaaS product. Owns the end-to-end product function and guides the evolution toward a flexible, AI-supported marketing measurement system. Reports to the CEO and works closely with Engineering, Data Science, Commercial, and Operations leaders.

Test Engineer will design and build hardware and software test setups for innovative products. Collaborate with customers on test procedures and analyze test results to improve production processes. Requires a bachelor's degree in Electrical Engineering or Mechatronics and strong communication and analytical skills.

Finance Professional will manage financial administration for three entities, including general ledger, month-end close, accounts payable/receivable, and financial reporting. Requires fluency in German and Dutch, 2-5 years of financial administration experience, and proficiency in ERP systems.

Provide customer support via phone and email, manage tickets, investigate issues, and escalate complex cases. Guide customers through software workflows and settings. Maintain accurate documentation and contribute to knowledge base updates.

Marketing and Events intern to support business growth within an international organization. Contribute to campaign development, content creation, and marketing projects with real business impact.

.NET Developer fluent in English to implement web services, extract internet data, and work with front-end frameworks. Requires 6+ years of software development experience, 4+ years in .NET (C#, ASP.NET Core), and knowledge of web components, REST APIs, and databases.

Shape global inventory optimization at BDR Thermea Group. As Group Inventory Manager, you will define and implement inventory strategy, policies, and governance, driving efficiency across multiple markets and sites. You will own inventory performance, optimize inventory levels, and collaborate with stakeholders to balance service, cost, and risk.

As a Customer Success Manager, you will manage a portfolio of customers, focusing on satisfaction, loyalty, and growth. You will conduct business reviews, identify upsell and cross-sell opportunities, and collaborate with internal teams to ensure smooth customer experiences.

Business Development Associate will join a Partner Success Team to accelerate Klarna's multi-product business in the Netherlands. Collaborate with strategic merchant partners to identify growth opportunities and support new business initiatives.

Drive new business sales and develop key relationships for a global Enterprise Relationship Management platform designed for law firms and professional services firms.

Senior Engineering Manager for Applied Machine Learning & Research will design, develop, and deploy machine learning models. The role involves managing a team of data scientists and ML engineers, ensuring project delivery, and staying current on AI advancements. Requires a Master's or Ph.D. in a relevant field, 4+ years in machine learning, and 2+ years leading engineering teams.

Drive innovation in model compression and efficient deployment for multimodal AI systems. Apply techniques like quantization, distillation, and pruning to reduce model footprint and computational cost while preserving accuracy. Research and analyze trade-offs between model efficiency and accuracy. Publish findings in top-tier AI conferences.

The Risk Officer will design, implement, and maintain internal control frameworks aligned with industry best practices and regulatory requirements. This role requires a blend of business and technical acumen, and sharp communication skills. The Risk Officer will partner with business and tech teams to implement a robust internal control framework, translating complex business and IT risks into practical business solutions.

Support the KYC & Compliance Manager on projects implementing a new KYC package and global power of attorney. Maintain KYC documentation, design a Treasury Regulatory database, and educate the business on compliance requirements.

This role handles the business operations of a growing SaaS company. Responsibilities include enterprise sales calls, contract negotiations, compliance, invoicing, and security questionnaires. The ideal candidate has B2B SaaS experience, legal familiarity, compliance experience, and Stripe experience.

Full-stack software engineer to design, build, and maintain production software across the stack. Develop backend systems, frontend applications, and cloud infrastructure. Collaborate with AI engineers, clinicians, and product colleagues.

Senior HR Business Partner will act as a strategic partner to senior leaders in the Netherlands, supporting business performance through people strategy, workforce planning, and operational excellence. This role balances strategic responsibilities with hands-on delivery across the employee lifecycle, ensuring compliance with Dutch employment law.

UX/UI Designer will optimize user journeys, design landing pages, and wireframes, and collaborate with cross-functional teams. Must have 2-4 years of experience, proficiency in Figma, and a data-driven approach.