Integration QA Engineer

Leadex Systems

QA Engineer focusing on backend integration testing for a UK-based fintech project. Collaborating with cross-functional teams on API testing and integration validation.

Posted 7/5/2026contractRemote • 🇬🇧 United KingdomMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in API testing, particularly with REST/SOAP APIs, and a strong ability to validate data accuracy within the MuleSoft/Salesforce ecosystem. Engages effectively with stakeholders to ensure alignment on integration requirements and quality metrics.

Highest-signal resume keywords

API TestingSQL SkillsPostmanMuleSoftSalesforce

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Back-End TestingSystem TestingIntegration TestingData VerificationError Handling

Soft Skills

Confident Spoken English

Tools & Technologies

PostmanSoapUI

Industry Keywords

Third-Party Service IntegrationsUK Fintech EcosystemData SecurityFinancial Transaction Flows

Tech Stack

Tools & technologies

SOAPSQL

About the role

Key responsibilities & impact

Plan and execute complex test scenarios for API flows, focusing specifically on how our system interacts with external third-party providers.
Validate data accuracy and transformation as it moves across various external services and the MuleSoft/Salesforce ecosystem.
Perform deep-dive testing of REST/SOAP APIs, ensuring error handling, rate limiting, and edge cases for third-party integrations are robust.
Identify, document, and track bottlenecks and bugs, working closely with MuleSoft developers and Salesforce architects to resolve integration gaps.
Help design and refine the end-to-end testing strategy, including regression suites and integration workflows.
Engage directly with UK-based client stakeholders to align on integration requirements and provide transparent reporting on quality metrics.

Requirements

What you’ll need

3+ years of QA experience with a heavy focus on Back-end, System, and Integration testing.
Proven track record of testing third-party service integrations (External APIs, Webhooks, etc.).
Expert-level proficiency with Postman, SoapUI, or similar API testing tools.
Strong SQL skills for data verification and backend state validation.
Understanding of data security and the high stakes of financial transaction flows.
Experience working on "zero-to-one" projects where processes need to be built, not just followed.
Confident spoken English (B2+ level) for active participation in meetings with the British client.
Familiarity with MuleSoft, Salesforce, or the UK Fintech ecosystem is a significant plus.

Benefits

Comp & perks

Flexible work schedule.
31 days of vacation.
5 sick days.
Sport compensation.
Support with purchasing the necessary equipment.