Senior Performance QA Engineer (API Performance Testing) at resilientco

<div> <p>We are seeking a <strong>senior Performance QA Engineer to lead API performance testing for an integrated ecosystem involving Salesforce,</strong> MuleSoft, and Oracle. This role is critical to ensure reliable, scalable API performance across boundary applications and to surface business-impacting risks before they reach production.</p> <p>The right candidate will design and execute a comprehensive performance testing strategy, translate complex test results into clear executive summaries, and drive remediation with engineering and leadership. This is an opportunity to own performance outcomes and improve cross-team visibility and decision making.</p> </div> Responsibilities • Design and implement API performance testing strategies (load, scalability, stress, endurance, volume). • Build and execute performance test plans that define users/transactions, duration, objectives, and success criteria. • Create and run tests using JMeter and/or Gatling to validate system behavior under load. • Analyze test results, identify bottlenecks, and recommend actionable remediation steps. • Collaborate with development, integration, and operations teams to reproduce issues and verify fixes. • Integrate performance testing into release cycles and provide guidance on performance gating. • Prepare concise, executive-ready summaries of findings, risks, and recommended next steps. • Leverage existing automation frameworks (Playwright, TypeScript, Cucumber) where applicable to augment testing coverage. • Mentor and provide technical guidance to other QA and performance team members. Requirements • 5+ years of hands-on experience in performance testing with a focus on APIs. • Proven, practical experience using JMeter and/or Gatling (at least one required). • Direct experience testing APIs within ecosystems that include Salesforce, MuleSoft, and Oracle. • Demonstrated ability to design full performance strategies beyond basic load testing. • Strong analytical skills with experience converting test data into actionable insights. • Excellent written and verbal communication skills, including presenting technical results to non-technical and executive audiences. • Ability to take independent ownership, operate with ambiguity, and define test approaches proactively. • Experience collaborating across distributed, integrated application environments. • Experience leveraging Playwright and TypeScript to support automation efforts. • Familiarity with Cucumber for behavior-driven testing and documentation. • Prior experience summarizing technical work into concise executive reports. Note • Strong preference for Colombia-based candidates • Preference for in-office presence most days, with flexibility when communicated in advance. • Location: Cra. 43A #6 sur 26, El Poblado, Medellín, Antioquia, Colombia