Power Global Markets with Code - Join StoneX

With 4,300 employees and over 400,000 retail and institutional clients from more than 80 offices spread across five continents, we’re a Fortune-100, Nasdaq-listed provider, connecting clients to the global markets – focusing on innovation, human connection, and providing world-class products and services to all types of investors.

Whether you want to forge a career connecting our retail clients to potential trading opportunities, or ingrain yourself in the world of institutional investing, The StoneX Group is made up of four segments that offer endless potential for progression and growth.

Business Segment Corporate Functions:

Now, we’re growing our Trading API Engineering team, and we’re looking for a skilled Automated Quality Assurance Engineer that will be a technical expert with a strong focus on software quality. They are great at designing software for testing and explaining it to both technological and business-oriented audiences and can work efficiently with a team of software and QA engineers to deliver projects

About the role (Position Purpose)

The candidate should actively evaluate new products and technologies to build solutions that can streamline business operations.  They must be delivery-focused with solid skills in automation of tests for API’s and windows services.  They will be required to be involved in technical discussions with the Team or Technical Lead. The candidate will be working on the company public REST API’s used by our platforms and partners to provide them with full trading functionality including authentication, trading, charting, and much more.

You’ll be an essential part of a highly skilled product team, collaborating with other engineers, tech leads, and QAs to build scalable, high-performing systems used by thousands of clients.

Tech Stack You’ll Work With

• Technologies, Languages & Frameworks: nUnit, C#, .NET Core, Postman, Swagger, RestSharp, Allure, NBomber, OpenSearch, Grafana, Jagger
• Architecture: Microservices, Event-driven (Kafka, AMQ), CQRS
• Cloud & Infra: Azure, Kubernetes, Docker, Rancher, TeamCity, Octopus, Grafana
• Databases: MS SQL Server (T-SQL), NoSQL, Postgres
• Tooling: GitHub, Visual Studio/Rider, ReSharper
• AI Tools: MS Copilot, GitHub Copilot
  
  

Primary duties will include

• Define automation-first test strategy and quality gates early with product, developers, and BAs, translating requirements into measurable coverage, risk-based priorities, and release criteria. 
• Own and evolve the automated test architecture (frameworks, patterns, reusable components), ensuring maintainability, scalability, and consistent engineering standards across repositories. 
• Design and implement robust automated tests (API/service, component, end-to-end, and contract/compatibility), including BDD specifications, test data management, and deterministic execution. 
• Establish and run performance and reliability testing (baseline, regression, load) and translate results into actionable engineering feedback to improve latency, stability, and user experience. 
• Integrate automation into CI/CD pipelines to provide fast feedback loops (reporting, trends, flaky-test detection, artifacts) and ensure failures block releases when quality thresholds are not met. 
• Lead defect prevention and rapid root-cause analysis, including log/telemetry review and failure triage, partnering with engineers to drive fixes and reduce recurrence through systemic improvements. 
• Own testing across environments and release readiness, coordinating with Service Delivery/Release teams, adhering to change processes, and validating production behavior post-release. 

Driving process/tooling improvements and influencing cross-team quality standards through documentation and knowledge sharing.

What We’re Looking For

• 3+ years of hands‑on experience in Test Automation, with strong proficiency in C# and automation frameworks.
• Solid experience testing distributed systems, including RESTful, SOAP, gRPC APIs, Windows services, and messaging platforms such as Kafka or ActiveMQ.
• Strong test automation skills, including BDD approaches (preferably SpecFlow/Reqnroll), debugging, code reviews, and building custom automation tools and utilities.
• Experience testing web and client‑server applications, with good understanding of databases and SQL.
• Practical knowledge of containerized and orchestrated environments, such as Docker, Kubernetes, or similar platforms, including deployment and release workflows.
• Deep understanding of the full software testing lifecycle, from requirements analysis through QA/UAT sign‑off and production release, within an Agile delivery model.
• Strong grasp of QA best practices, SDLC, and experience working with version control, build, deployment, and test management tools.
• Excellent communication and collaboration skills, with domain knowledge in financial systems (e.g. Trading platforms, CFDs, Forex, real‑time data) considered a strong plus.

Education

• Bachelor's degree in computer science, Software Engineering, or related field — or equivalent hands-on experience.