Senior Software Development Engineer in Test, SDET

Topstep

. Drive test automation across API, UI, and end-to-end testing .

Posted 11/4/2026full-timeRemote • United StatesSenior💰 $155,000 - $190,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in test automation, framework development, and quality assurance practices, with a strong focus on API and real-time testing. Proficient in leveraging AI-assisted tooling for test generation and maintaining scalable CI/CD infrastructure.

Highest-signal resume keywords

Test Automation Framework DevelopmentTypeScript ProgrammingAPI Testing with RESTful ServicesCI/CD Integration with GitHub ActionsMentoring on Automation Patterns

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Test AutomationFramework DevelopmentTypeScriptPlaywrightCypressSeleniumAPI TestingReal-Time TestingDebuggingNon-Functional Testing

Soft Skills

Excellent CommunicationAdvocacy for Quality

Tools & Technologies

AI/LLM-Assisted ToolingGitHub ActionsArgoCDTerraformKubernetes

Industry Keywords

FintechLow-Latency SystemsContract TestingConsumer-Driven TestingObservability-Driven Testing

Tech Stack

Tools & technologies

CypressKubernetesReactSeleniumTerraformTypeScript.NET

About the role

Key responsibilities & impact

Drive test automation across API, UI, and end-to-end testing
Use and extend AI-assisted test-generation tooling to produce and maintain broad, verification-focused coverage
Build and maintain scalable test frameworks and CI/CD infrastructure for real-time paths, including order lifecycle, WebSocket market-data streams, and financially material calculations
Partner with product and engineering teams to define testability requirements and quality standards early
Lead by example on clean, maintainable, and well-documented test code
Triage test-suite failures quickly, reduce flakiness, and make results and quality metrics visible and trustworthy
Identify and drive resolution of quality gaps, systemic testing weaknesses, and test-related technical debt
Mentor engineers and SDETs on automation patterns, AI-assisted testing workflows, non-functional testing, and quality-first practices

Requirements

What you’ll need

5+ years in software testing with a strong focus on test automation and framework development
Expert programming skills and production-quality test code in TypeScript
Hands-on experience building test automation frameworks from scratch; Playwright preferred, with Cypress, Selenium, or similar also relevant
Experience using AI/LLM-assisted tooling for test creation and verification, with judgment to validate and curate generated output
Strong API and real-time testing experience with RESTful services and WebSocket/streaming systems
Solid grasp of React/TypeScript front end and C#/.NET backend services, databases, and service architecture
CI/CD experience integrating automated tests into deployment pipelines, including GitHub Actions
Ability to design test strategies balancing coverage, execution time, and maintenance overhead
Strong debugging across frontend, backend, database, and infrastructure
Excellent communication and ability to advocate for quality and influence engineering practice
Non-functional testing experience in performance, load, and resilience preferred
Familiarity with ArgoCD, Terraform, and Kubernetes preferred
Experience testing trading, fintech, or other low-latency/financially sensitive systems preferred
Contract/consumer-driven testing between services preferred
Observability-driven testing using logs, metrics, and traces preferred

Benefits

Comp & perks

Seven Company-paid Holidays and generous Family Leave
Paid time off is front-loaded
Competitive 401(k) matching
Health, dental, and vision insurance for full-time employees
Bonus for taking 5 consecutive vacation days
Food and groceries budget
Contributions towards health and wellness
Performance-based bonus