Senior SDET - Voice

Join Vonage and help us innovate cloud communications for businesses worldwide! As an emerging leader in the $10B+ communications API market, we empower global brands to connect better with their customers, employees, and partners through transformative communications experiences. Vonage API solutions empower organisations to build their custom omnichannel communications structure, allowing them to reach and engage customers on their preferred schedule and channel, including voice, video, and messaging.

Think of a rideshare service instantly connecting with customers, hospital staff conducting remote monitoring, customers verifying their identity before completing a purchase, AI virtual agents servicing customers around the clock, and much more. Why this role matters As a Senior Software Development Engineer in Test (SDET IV) on the Voice Test Engineering team, you embed quality, reliability, and observability into every stage of our voice platform's software development lifecycle. You partner closely with engineering teams to design, build, and ship robust, testable voice infrastructure, and you architect, develop, and maintain the automated test frameworks, suites, and tooling that power continuous integration, delivery, and deployment across Vonage's globally distributed voice platform.

Your work ensures reliability at scale across SIP signaling, media processing, emergency calling, and voice API services, covering functional, integration, performance, chaos, and regression testing, while accelerating developer productivity and reducing defect escape in production. You will be a key technical leader within our Python-based voice test automation framework, driving its evolution and expanding its coverage across SIP proxy APIs, inbound/outbound call flows, Asterisk, FreeSWITCH, Kamailio, and Kubernetes-hosted voice services across six global AWS regions. As a senior technical leader, you will influence architectural decisions within the test framework, introduce best-in-class testability patterns, mentor engineers in automation and quality engineering practices, and drive continuous improvement across CI/CD pipelines.

Your impact will be measured not only in test coverage and defect reduction, but in the platform reliability, operational confidence, and engineering culture you help create. If this sounds like you, continue reading below...

Key Responsibilities

Influence architecture and design reviews with a focus on testability, SIP call flow coverage, performance, and the long-term automation strategy for the voice platform Architect and evolve our voice test automation framework, including API client layers, Pydantic-typed service abstractions, pytest fixture hierarchies, and Jenkins seed-based CI orchestration, to support continuous onboarding of new voice features and services Build and maintain scalable CI/CD-aligned test suites (smoke, regression, performance, chaos, non-functional) across all supported AWS regions; assess feature impact, close coverage gaps, and own quality gates for production deployments Author and own SIPp scenario XML files for complex SIP call simulations: inbound/outbound routing, SIP proxy API validation, emergency calling, domain auth (ACL/dauth), and multi-region failover scenarios Lead chaos and non-functional test strategy, designing fault injection scenarios (chaos-mesh, AWS FIS) targeting Asterisk, FreeSWITCH, Couchbase, Redis, PSLB, and INPS to validate platform resilience and failover behavior Drive quality operations: track, triage, and escalate defects and enhancements in JIRA; communicate risks, required test hooks, and release readiness to engineering and product stakeholders Mentor SDET III engineers in SIP testing, Python framework design, pytest best practices, and Kubernetes-based test environment management What you'll bring Self-motivation, creativity, and proactiveness to work successfully in a fast-paced environment spanning diverse voice technologies, cloud infrastruct