Software Development Engineer in Test – SDET

Zefr

. Plan testing for each feature by joining grooming, asking clarifying questions, and writing test plans covering happy paths, edge cases, and negative cases .

Posted 10/13/2026full-timeMarina del Rey • California • United StatesJunior💰 $90,000 - $120,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in test automation, particularly for REST and GraphQL APIs, with strong coding skills in Python or similar languages. Proficient in validating data quality and integrating test suites into CI/CD pipelines while collaborating effectively with cross-functional teams.

Highest-signal resume keywords

Test AutomationPython ProgrammingAPI TestingCI/CD IntegrationData Validation

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Test AutomationPythonJavaTypeScriptGoAPI TestingSQLPlaywrightCypressSelenium

Soft Skills

Clear Written CommunicationCollaboration

Tools & Technologies

CI/CD PipelinesGitTest PlansDashboardsAlerts

Industry Keywords

QA EngineerSDETData QualityTest PyramidBug Reports

Tech Stack

Tools & technologies

CloudCypressGraphQLJavaPythonReactSeleniumSQLTypeScriptGo

About the role

Key responsibilities & impact

Plan testing for each feature by joining grooming, asking clarifying questions, and writing test plans covering happy paths, edge cases, and negative cases
Build and maintain automated tests for REST and GraphQL APIs, backend services, web UIs, and third-party partner APIs
Review teammates' test code
Validate data pipelines and data quality through schema, row-count, freshness, and business-rule checks
Help define data SLAs
Test AI and ML features by comparing model or prompt versions, validating shadow deployments, and testing AI agents and MCP servers
Integrate test suites into CI/CD pipelines to gate merges and deployments
Triage failures, fix flaky tests, and reduce test run time
Validate releases in preview, staging, and production; prepare test data, run regression, sign off, and verify after deployment
Build synthetic checks, dashboards, and alerts to monitor production quality
Reproduce issues, identify root causes, write bug reports, verify fixes, and assist with high-severity incidents
Collaborate with engineers, product managers, data scientists, and customer-facing teams
Turn findings into well-scoped tickets and share quality status

Requirements

What you’ll need

1–3 years of experience, ideally as a QA engineer or SDET, with hands-on test automation
Solid coding skills in at least one language used for test automation; Python preferred, or Java, TypeScript, or Go
Experience automating API tests, including request and response validation, schema checks, and negative cases
Experience with Playwright, Cypress, or Selenium
Working SQL and ability to query across tables
Knowledge of edge cases, boundary values, negative cases, and the test pyramid
Comfort with Git, pull requests, code review, and CI/CD pipelines
Ability to read logs, inspect network calls, and query databases for debugging
Clear written communication for bug reports, test plans, and async status updates
Applicants must be willing and able to work 2–3 days per week in Marina del Rey, CA
Nice-to-have qualifications are explicitly not required: cloud and containers, data pipeline tools, ML/LLM testing, AI agents or MCP servers, observability tools, performance testing, ad tech or digital media APIs, React, and test-environment security basics

Benefits

Comp & perks

Flexible PTO
Medical, dental, and vision insurance with FSA options
Company-paid life insurance
Paid parental leave
401(k) with company match
Professional development opportunities
13 paid holidays off
Summer Fridays (we leave early)
In-office, hybrid, and fully-remote work options available
In-office lunches and lots of free food
Optional in-person and virtual events