[Hiring] Sr. SDET - Performance Testing @TradeStation

Role Description

We are looking for a Sr. SDET focusing on Performance is an engineer focused on quality at every layer — from functional correctness to system-level performance. In this role, you will champion high-quality deliverables by designing and building test frameworks, executing performance and load tests, and integrating quality gates across our CI/CD pipelines. You will focus on the reliability, scalability, and low-latency requirements of our brokerage and trading platform services, working closely with development and DevOps teams to ensure deterministic, developer-friendly test infrastructure.

What You’ll Be Doing

• Design and develop scalable automated test frameworks for validating complex web applications, RESTful/WebSocket APIs, microservices, and event-driven systems, with a strong emphasis on performance, load, and stress coverage.
• Create, automate, and execute test plans (functional, regression, performance, reliability) that generate artifacts to validate proper application behavior and provide quality-related metrics.
• Build and maintain performance test suites covering load, stress, spike, and soak scenarios; establish latency baselines and throughput SLAs and enforce them as quality gates in CI/CD.
• Build mocking and simulation frameworks that emulate upstream services and dependencies (Kafka, market data, order routing, etc.) to enable isolated, dependency-free testing.
• Integrate test execution seamlessly with GitLab CI/CD pipelines, enabling full automation and parallelized test runs.
• Enable developers to run complete regression and performance suites locally, independent of shared environments.
• Document and track program defects; conduct root cause analysis for test failures and production issues to identify system fragility and design risks.
• Participate in code reviews and provide guidance to the team on designing for testability and performance.
• Partner with DevOps on test environment automation, data provisioning, and performance result visualization using observability dashboards (Datadog, Grafana, or equivalent).
• Research and apply emerging test tools, trends, and methodologies. Raise risks early to engineering leadership and influence design decisions to improve quality and reliability.
• Mentor team members in advanced testing techniques, performance measurement, and latency profiling best practices.

Qualifications

• Strong experience with C# and .NET / .NET Core.
• Broad knowledge of JavaScript in the browser and in Node.js; familiarity with web technologies (HTML, CSS, HTTP, REST, WebSocket, JSON).
• Minimum 3 years of dedicated, hands-on performance testing experience using tools such as k6, Gatling, JMeter, NBomber, or Locust — including load, stress, spike, and soak testing.
• Demonstrated ability to profile, analyze, and tune system performance using APM and observability platforms (e.g., Datadog, Grafana, AppDynamics, Dynatrace) to identify latency regressions and throughput bottlenecks.
• Experience with REST/WebSocket APIs, and microservice architectures.
• Proficiency in mocking, and stubbing.
• Cloud-native technologies in AWS or Azure, including Kubernetes and Docker containerization.
• Continuous integration / build tools (GitLab CI, Azure DevOps, etc.).
• Moderate database experience (SQL Server, NoSQL, Redis).
• Experience with scripting languages such as Bash, or Python is a plus.
• Web application debug tools (Curl, Fiddler, Wireshark, Chrome Developer Tools, etc.).
• Strong communication and documentation skills; comfortable engaging with senior engineers and leadership.
• Performance testing of low-latency trading systems or high-throughput financial services, including latency profiling, throughput benchmarking, and SLA validation preferred.
• Experience using AI to test systems in financial services or similarly regulated, low-latency environments preferred.
• Agile Development and Test-Driven Development (TDD) practices preferred.
• Brokerage or trading platform experience preferred.
• Distributed source control tools (Git, Mercurial) preferred.
• Cloud architecture and deployment (AWS or Azure); knowledge of AWS MSK, ECS/Fargate, ElastiCache preferred.
• Multiple programming languages including Python for automation and integration testing preferred.
• Experience with Agile Development preferred.

Requirements

• Bachelor’s degree in Computer Science, Engineering, or equivalent work experience.
• 5+ years of experience in software quality engineering or test framework development.
• 3+ years of dedicated performance testing experience.

Benefits

• Collaborative work environment.
• Competitive Salaries.
• Yearly bonus.
• Comprehensive benefits for you and your family starting Day 1.
• Unlimited Paid Time Off.
• Flexible working environment.
• TradeStation Account employee benefits, as well as full access to trading education materials.