ph3Join Vonage and help us innovate cloud communications for businesses worldwide! /h3 h3What You Will Do /h3 ul libDefine and lead /b the performance engineering strategy across high-availability, cloud-native telecom platforms. /li libLead, train, and coordinate a distributed guild of SDETs /b across multiple feature teams, guiding them to build, maintain, and execute performance scripts (k6) within their fractional sprint capacity. /li libDesign, develop, and evolve /b scalable backend performance frameworks using k6, Python, Java, or TypeScript, focusing entirely on APIs, databases, and infrastructure. /li libImplement and manage production traffic replay strategies /b (e.g., GoReplay) and complex multi-tenant test data generation to accurately recreate realistic production contention and load profiles. /li libOwn and drive /b performance, load, stress, endurance, scalability, and resilience testing, including chaos engineering practices (e.g., using AWS Fault Injection Simulator). /li libValidate real-time communication systems, event-driven architectures (Kafka, RabbitMQ), /b and high-throughput distributed systems under production-like conditions. /li libIntegrate performance testing into CI/CD pipelines /b , enabling continuous performance validation, shift-left practices, and automated PR blocking for latency degradation. /li libLeverage observability tooling /b (Grafana, CloudWatch, Coralogix, VictoriaMetrics, PMM) to monitor, analyse, and troubleshoot system performance. /li libEstablish performance benchmarks /b , SLAs, SLOs, and error budgets aligned with business and system requirements. /li libCollaborate with architecture and data teams /b to identify bottlenecks, validate database architectures (e.g., MySQL, Tungsten), and present evidence-based investment proposals. /li libAnalyse and optimise performance /b across both legacy monolith systems (requiring integrated load testing) and modern microservices architectures. /li /ul h3What You Will Bring /h3 ul libProven experience mentoring and coordinating /b testing efforts across large, distributed engineering teams (e.g.,



conducting code reviews, guiding SDETs through framework adoption, and managing cross-team test schedules). /li libStrong hands-on experience with AWS cloud services /b (EC2, ECS, RDS, API Gateway) with a focus on scalability and performance optimisation. /li libProven expertise in performance testing tools /b (specifically k6, along with JMeter or Gatling), including test design, execution, and analysis at scale. /li libHands-on experience with production traffic shadowing /b or replay tools (such as GoReplay). /li libDeep experience testing distributed systems, message brokers (Kafka, RabbitMQ), /b microservices architectures, and high-volume, low-latency APIs. /li libSolid backend programming and scripting skills /b in Python, Java, or TypeScript to build custom performance frameworks and tooling. /li libStrong understanding of system design /b , concurrency, throughput, latency, and fault tolerance principles. /li libExperience implementing performance testing within CI/CD pipelines /b (Jenkins, GitHub Actions) and enabling continuous performance feedback loops. /li libHands-on experience with observability and monitoring tools /b (Grafana, Coralogix, PMM) for performance analysis and diagnostics. /li libExperience working within Agile environments /b and translating performance insights into actionable engineering outcomes. /li /ul h3Required /h3 ul liDemonstrable hands-on experience in backend performance engineering and automation using bPython, Java, or TypeScript. /b /li liProven track record of performance, scalability, and resilience testing in AWS-based cloud-native systems.



/li liStrong experience designing large-scale performance test strategies and leading QA/SDET teams to execute them. /li liDeep understanding of API performance testing, integration testing, and system-level non-functional validation. /li liSolid grasp of system architecture, distributed systems behaviour, and non-functional testing methodologies. /li liExperience with observability, monitoring, and log analysis tools. /li liFamiliarity with RESTful APIs and event-driven systems. /li /ul h3Application Requirements /h3 ul liUpdated CV clearly demonstrating performance engineering leadership, cross-team coordination, AWS expertise, and backend automation frameworks. /li liSummary of performance testing frameworks, tools (e.g., k6, GoReplay), and CI/CD methodologies implemented. /li liDetailed examples of performance testing engagements (scale, environments, bottlenecks identified, business impact, improvements delivered). /li liEvidence of driving performance strategy, mentoring QA/SDET teams, and influencing architecture. /li /ul pThere's no perfect candidate. You don't need all the preferred qualifications to make a valuable impact on our team. Our employees and customers come from diverse backgrounds, so if you're passionate about what you could achieve at Vonage, we'd love to hear from you. /p pTo learn how we process your personal data during the recruitment process, please refer to our bPrivacy Notice /b . /p h3Who we are: /h3 pVonage is a general cloud communications leader. And your talent will further help brands - such as Airbnb, Viber, WhatsApp, and Snapchat - accelerate their digital transformation through our fully programmable-based unified communications, contact center solutions, and communications APIs. Ready to innovate? Then join us today. /p pNote: The purpose of this profile is to provide a general summary of essential responsibilities for the position and is not meant as an exhaustive list. Assignments may differ for individuals within the same role based on business conditions, departmental need or geographic location. /p /p #J-18808-Ljbffr

📌 Lead Performance Tester (SDET) (Madrid)
🏢 Vonage
📍 Madrid