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Client Implementation Specialist

Esw

Madrid Remote permanent

Posted: February 18, 2026

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Quick Summary

Assist in implementing and testing business integration on our platform, working closely with clients and internal teams to ensure high-quality success.

Job Description

The Opportunity

We are looking for a proactive and detail-oriented Client Implementation Specialist to join our team. This role is essential to the successful onboarding of retailers onto our platform. You will work closely with both internal teams and external clients, acting as the key point of contact during the onboarding and testing phases of project delivery.

As an Implementation Specialist, you will manage and perform Business Acceptance Testing (BAT) and User Acceptance Testing (UAT), ensuring the quality and readiness of our platform integrations. You will also guide clients through the testing and launch process, troubleshooting any issues and driving successful outcomes.

Responsibilities

• Lead and execute Business Acceptance Testing (BAT) for retailers integrating with our platform.

• Conduct User Acceptance Testing (UAT) for projects in active deployment.

• Serve as the primary point of contact for client-facing onboarding and testing activities.

• Educate and guide retailers through our testing and launch processes, ensuring a smooth onboarding journey.

• Troubleshoot issues during testing phases and escalate as needed to internal teams.

• Collaborate cross-functionally with Product, Engineering, and Support teams to ensure client requirements are met.

• Document test results, feedback, and issues clearly and professionally for both internal and external audiences.

Requirements

• Prior experience in a QA or Testing role, ideally within an ecommerce or SaaS environment.

• Strong client-facing experience - you’re comfortable leading external conversations and managing expectations.

• Excellent communication skills- both written and verbal. Able to explain technical issues clearly to non-technical stakeholders.

• Confident troubleshooting issues and navigating ambiguity to identify root causes.

• A logical thinker with a problem-solving mindset - comfortable working through challenges independently.

• Experience using tools for test case tracking, bug reporting, and collaboration (e.g. Jira, Confluence, TestRail, Slack, etc.) is a plus.

About ESW

Our purpose is simple: to create moments that matter between people and the brands they cherish. We enable brands to expand their global reach, facilitating simple and seamless ecommerce experiences for consumers worldwide. Through our integration solutions, we deliver a complete international checkout experience, including local duties, taxes, fulfilment, delivery management, and global returns and payment processing capabilities.

Guided by our values - Own It, Champion Simplicity, Win as One, and Debate then Commit - we strive to foster innovation, accountability, and teamwork, creating solutions that inspire trust and drive impactful results.

Why join us?

• Competitive salary and benefits: Your financial well being is important to us. Join ESW and experience the satisfaction of being rewarded for your hard work, dedication and commitment.

• Professional and personal development: Find your spark and leave your mark. We will ensure your talent is nurtured and cultivated for growth and success throughout your career with ESW.

• Hybrid Working: Our Hybrid Working Model empowers you to embrace the flexibility of hybrid working and enjoy the best of office and remote work.

• Diversity, Belonging & Inclusion: When we win, we win together. You'll be part of a culture that values every individual for who they are, fostering an environment where uniqueness is encouraged.

ESW is an equal opportunity employer, and we’re proud of our ongoing efforts to foster diversity, equity, & inclusion in the workplace. Individuals seeking employment and employees at ESW are considered without regard to race, color, religion, national origin, age, sex, gender, gender identity, gender expression, sexual orientation, marital status, medical condition, ancestry, disability, military or veteran status, or any other characteristic protected by applicable law.

If you require any reasonable accommodations or adjustments throughout the hiring process, please let us know. We are dedicated to ensuring equal access and opportunity for all candidates.

#LI-hybrid #LI-AL1

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