Who We Are Freedx is a newly established cryptocurrency exchange focused on building a scalable, compliant, and liquidity driven trading platform. Our team brings deep experience across crypto exchanges, payments, market structure, and financial infrastructure. Freedx is built for serious traders and emerging markets, with a clear focus on unit economics, operational discipline, and sustainable growth.
Our Vision Freedx aims to be a trusted integral exchange by combining strong liquidity, efficient onboarding, and disciplined growth execution. We focus on long term retention and monetization rather than vanity metrics, ensuring that growth directly translates into trading volume, revenue, and profitability.
Role Overview We are looking for a Senior QA Engineer to ensure the quality, reliability, and accuracy of trading and related products for a centralized crypto exchange.
This role requires strong technical knowledge and an understanding of complex financial systems. You will test core trading operations, real-time data streams, financial calculations, APIs, system integrations, analytics, and user-facing dashboards.
You will work closely with Product Managers and Engineering teams throughout the full development lifecycle, from requirement analysis and test planning to release validation and production incident investigation.
The ideal candidate understands how trading systems behave under normal, edge-case, and failure scenarios and can identify risks related to incorrect calculations, delayed data, system synchronization, balance inconsistencies, and order execution.
Responsibilities Own the QA process for trading and analytics products
Review product requirements and identify missing scenarios, risks, and technical dependencies
Test order creation, execution, cancellation, rejection, and order status transitions




Test system integrity, real-time market data, WebSocket streams, and synchronization between services
Validate PnL, margin, liquidation, fees, balances, funding, and risk-control calculations
Test trading dashboards, system analytics, reports, and data consistency
Perform functional, integration, API, UI, regression, and end-to-end testing
Create test plans, test cases, checklists, test data, and regression suites
Verify that product delivery meets functional, technical, and quality standards
Test negative scenarios, edge cases, service failures, and recovery flows
Investigate production issues, reproduce defects, analyze logs, and support incident reviews
Work closely with Product Managers, developers, DevOps, data, and support teams
Improve release validation, defect prevention, QA processes, and test coverage
Cross device product support
Requirements 4+ years of QA experience
Experience with crypto or FX exchanges, brokerage, fintech, or trading platforms
Strong understanding of order books, order types, liquidity, margin, PnL, fees, and liquidation
Experience testing APIs, WebSockets, databases, analytics dashboards, and complex data flows
Experience with functional, integration, regression, and end-to-end testing
Ability to validate financial calculations and complex business logic
Ability to analyze system behavior across multiple connected services
Strong analytical, technical,



and communication skills
High attention to detail and a structured approach to problem-solving
Experience with test automation is a plus
Knowledge of authentication, payments, deposits, withdrawals, and balance operations is a plus
English level B2
Technical Skills And Tools Strong experience testing REST APIs using Postman or similar tools
Experience working with Swagger/OpenAPI documentation
Experience testing WebSocket connections and streamed data
Good knowledge of HTTP, JSON, authentication methods, request headers, status codes, and API error handling
Experience using browser developer tools for frontend and network debugging
Experience with log monitoring and analysis tools such as Kibana, Grafana, Datadog, or similar
Experience with performance-testing tools such as JMeter, k6, or similar
Experience with test management and issue-tracking tools such as Jira, TestRail, Zephyr, or similar
Understanding of microservice architecture, message queues, and asynchronous system communication
Experience with Kafka, RabbitMQ, or similar technologies is a plus
Ability to write SQL queries and validate data directly in databases is a plus
Experience with automation tools such as Playwright, Cypress, Selenium, or similar is a plus
Benefits Freedx is an equal opportunity employer. We stand for an open and inclusive work environment that fosters the well-being of everyone. We embrace and encourage differences in age, color, disability, ethnicity, family or marital status, gender identity or expression, language, national origin, physical and mental ability, race, religion, sexual orientation, socio-economic status, veteran status, and other characteristics that make our people unique.
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📌 Senior Qa Engineer - Trading & Analytics (Madrid)
🏢 FreedX
📍 Madrid