Senior QA Engineer

About JuiceX
JuiceX is a rapidly growing prediction markets exchange. Our company is building the infrastructure to offer a fully compliant, transparent, and innovative marketplace for event driven contracts under U.S. regulatory frameworks.
The Opportunity
We are hiring a Senior QA Engineer to own quality across the full delivery lifecycle, from business requirement through production sign off. At a regulated exchange where trading, clearing, and the payments that fund them all have to be correct, quality protects our customers' money and our regulatory standing. You will work across distributed backend services in Rust, web and mobile front ends in React and TypeScript, a cloud native platform on Kubernetes, and integrations with payment, identity, and market infrastructure partners.
Professional Experience
Owning quality across the full delivery lifecycle, from requirements through production sign off
Risk based test strategy and test design across unit, integration, end to end, performance, and exploratory testing
Hands on test automation and the frameworks behind it, integrated into CI/CD
Testing distributed backend services and modern web and mobile front ends
Reading and writing code and validating data directly, not testing only through the UI
Using AI coding and testing tools to accelerate work without lowering the quality bar
Qualifications
5+ years in QA or quality engineering, including owning release sign off for production systems
Strong test design and risk analysis skills
Hands on test automation, ideally Playwright with TypeScript, plus API testing
Comfortable reading and writing code in at least one backend language (Rust is a plus)
Working SQL for data validation
Real, regular use of AI coding and testing tools, with examples you can share
CI/CD experience
Clear written communication
Preferred: financial services experience, including trading, payments, or fintech
Preferred: experience in regulated environments
Preferred: performance and load testing
Preferred: experience building AI agents, tooling, or LLM evaluations
Preferred: mobile testing
Position Responsibilities
Turn business requirements into clear, testable acceptance criteria before development starts
Define a risk based test strategy for each initiative, balancing unit, integration, end to end, performance, and exploratory testing
Design, build, and maintain automated test suites and frameworks, and integrate them into CI/CD
Review changes for test quality and coverage, and drive flaky or failing tests to root cause
Own the go or no go decision for production releases, with clear, auditable evidence of what was tested
Track escaped defects, feed the lessons back into requirements and tests, and raise the quality bar across the team
Use AI to turn requirements into test scenarios, edge cases, and automation
Run agent driven exploratory and UI testing
Build AI assisted tooling for test maintenance and failure triage, and reusable QA workflows the team can apply
Test and evaluate AI powered product features, verifying AI output against real system behavior before sign off

Work arrangement
Yes