Integration QA Engineer

About Leadex Systems:

Leadex Systems is a niche software consulting company and a long-time MuleSoft partner. We provide best-in-class API Management solutions in the Middle East and Europe. Our team of 66 like-minded professionals combines technical expertise with domain knowledge in digital banking, finance, and e-commerce. We embrace proactiveness, continuous learning, team spirit, and commitment to customer success

About the role:

We are looking for a Back-end specialist who lives and breathes integrations. Your focus will not be on UI or internal microservices communication, but on the complex orchestration between our core platform and external third-party services (payment gateways, KYC providers, banking APIs, etc.).

Responsibilities:

• End-to-end integration testing: Plan and execute complex test scenarios for API flows, focusing specifically on how our system interacts with external third-party providers.

• Data integrity and mapping: Validate data accuracy and transformation as it moves across various external services and the MuleSoft/Salesforce ecosystem.

• Backend validation: Perform deep-dive testing of REST/SOAP APIs, ensuring error handling, rate limiting, and edge cases for third-party integrations are robust.

• Defect orchestration: Identify, document, and track bottlenecks and bugs, working closely with MuleSoft developers and Salesforce architects to resolve integration gaps.

• Process architecture: Since this is a "from-scratch" project, you will help design and refine the end-to-end testing strategy, including regression suites and integration workflows.

• Stakeholder collaboration: Engage directly with UK-based client stakeholders to align on integration requirements and provide transparent reporting on quality metrics.

Requirements:

• 3+ years of QA experience with a heavy focus on Back-end, System, and Integration testing.

• Integration specialist: Proven track record of testing third-party service integrations (External APIs, Webhooks, etc.).

• Technical toolkit: Expert-level proficiency with Postman, SoapUI, or similar API testing tools.

• Data proficiency: Strong SQL skills for data verification and backend state validation.

• Fintech mindset: Understanding of data security and the high stakes of financial transaction flows.

• Self-starter: Experience working on "zero-to-one" projects where processes need to be built, not just followed.

• Communication: Confident spoken English (B2+ level) for active participation in meetings with the British client.

• Bonus: Familiarity with MuleSoft, Salesforce, or the UK Fintech ecosystem is a significant plus.

We offer:

• Flexible work schedule.

• 31 days of vacation.

• 5 sick days.

• Sport compensation.

• Support with purchasing the necessary equipment.

Feel free contact with me via tg @ksusha_happy_hr