Senior Automation Tester in Python (Agentic Gateway testing)

We are looking for a Senior Automation Tester in Python to join our team and build an Enterprise Agent Development Platform — a production-grade, cloud-native ecosystem that enables engineering teams to define, orchestrate, deploy, and observe AI agents at scale. The platform standardizes agent development across the organization using LangGraph and Strands Agents on AWS AgentCore Runtime. The initiative spans agent framework design, runtime architecture, marketplace integration, CI/CD automation, and enterprise-grade observability — reducing agent development from months to days while enforcing consistent security, quality, and governance standards. You will own functional, security, and performance test suites for the agentic gateway. Responsibilities Design and execute test suites for agentic workflows, including tool discovery, tool invocation, and multi-step agent workflowsValidate MCP protocol behavior, including tool list aggregation, tool call routing, and streaming response handlingVerify agent authorization mechanisms, including unauthorized tool access attempts and policy enforcement validationConduct agent performance testing covering tool discovery latency, concurrent agent sessions, and agent-to-agent latencyBuild Python-based test automation using pytest with async support, mock MCP servers, and agent workflow simulationValidate agentic observability, including trace completeness, agent step logging, and audit trail verificationCollaborate with engineering teams to define quality standards for agent framework design and runtime architectureSupport CI/CD automation efforts by integrating test suites into deployment pipelines Requirements 3+ years of QA engineering experience for AI/ML or agent systemsHands-on experience testing AI agent systems in a production agentic AI project, such as MCP protocol testing, agent authorization/policy-enforcement testing, or multi-step agent workflow test automationExperience testing LLM agent workflows, including tool calling and multi-step reasoningExpertise in security testing for authorization and authenticationSkills in performance benchmarking for cloud services Nice to have Familiarity with MCP protocol testingBackground in agent framework testing (LangChain, LangGraph, Crew)Knowledge of AWS Bedrock Agents testingUnderstanding of chaos engineering for agentic systemsFamiliarity with audit log validation (CloudTrail, OpenTelemetry traces) We offer We gather like-minded people:Top tech minds driving innovation in AI, cloud and digital platform modernizationSupportive team and agile, startup-like cultureHybrid by design mode and opportunity to work remotely within PolandChance to work abroad for up to 60 days annuallyBusiness-driven relocation opportunitiesWe provide growth opportunities:Career development programsThought leadership, mentoring, soft skills and well-being programsCertification (Anthropic, Gemini, GCP, Azure, AWS)English classesWe cover it all:Stable payParticipation in the Employee Stock Purchase Plan with a 15% discountBenefits package (health insurance, multisport, shopping vouchers)Referral bonuses up to $2,000Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and moreCorporate, social and well-being eventsPlease, note:Benefits listed above are available to employees onlyWe are open for working with Contractors. Terms of B2B cooperation agreements are agreed individuallyWe will reach out to selected candidates exclusively EPAM is global leader in AI transformation engineering and integrated consulting, serving Forbes Global 2000 companies and ambitious startups. With over thirty years of expertise in custom software, product and platform engineering, we empower our clients to become AI-Native enterprises, driving measurable value from innovation and digital investments.