Global API Integration Engineer - Payments Tech

Worldline; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Private medical & life insurance

MyBenefit Platform

Holiday allowance

Public transportation allowance

Meal allowance

Annual bonus

Job summary

Worldline is seeking an API Integration Engineer to join our global technical team. You will ensure seamless communication between internal systems and external clients, enabling secure payments via Terminal API and Tap on Mobile (ToM).

The role offers an international environment and close collaboration with engineering, QA, and customer teams. You will work on next-generation API integrations, contribute to robust documentation, and help optimize integration performance.

Qualifications

• Master's degree or equivalent in a relevant field.
• 4–5 years of experience in a similar API integration role.
• Experience with API integrations in financial services or POS/ECR environments is a strong asset.

Responsibilities

• Onboarding focus: deliver a structured onboarding package with Documentation, Integration Kits, Kickoff Meetings, and Test Equipment.
• Collaborate with integrators and partner developers to embed Worldline’s ECR API into partner ECR environments for secure payments via Terminal API and ToM.
• Produce and maintain developer documentation, sample code, tutorials, and API references; keep guides updated for API product use cases.
• Advise on best practices for API usage, error handling, and monitoring to accelerate time-to-value and production readiness.
• Troubleshoot and resolve API connectivity and interoperability issues.

Skills

API integration

English communication

System integration

Team player

Education

Master's degree

Tools

ECR API

Terminal API

ToM API

Job description

Worldline is seeking an API Integration Engineer to join our global technical team. You will ensure seamless communication between internal systems and external clients, enabling secure payments via Terminal API and Tap on Mobile (ToM).

The role offers an international environment and close collaboration with engineering, QA, and customer teams. You will work on next-generation API integrations, contribute to robust documentation, and help optimize integration performance.