SDET at TradeStation – Heredia | Jobyssey

#WeAreTradeStation

Who We Are:

TradeStation is the home of those born to trade. As an online brokerage firm and trading ecosystem, we are focused on delivering the ultimate trading experience for active traders and institutions. We continuously push the boundaries of what's possible, encourage out-of-the-box thinking, and relentlessly search for like-minded innovators.

At TradeStation, we are building an AI-First culture. We expect team members to embrace AI as a core part of their daily workflow, whether that’s using AI to accelerate development, enhance decision-making, improve client outcomes, or streamline internal processes. We hire, grow, and promote people who can harness AI responsibly and creatively. We treat AI as a partner in problem-solving, not just a tool; following our governance standards to ensure AI is used ethically, securely, and transparently. If you join us, you’re joining a culture where AI is how we work.

Are you ready to make yourself at home?

What We Are Looking For:

Do you enjoy tackling interesting problems with other smart people? Have you ever wondered how a major player in the Financial Technology industry operates? At TradeStation, you'll enjoy working in a supportive environment with the latest in microservices and streaming technology — all from the comfort of your home office.

We are seeking a Software Development Engineer in Test (SDET) to join the Order Execution – Streaming (OXS) team. OXS builds low-latency, scalable, and extensible services that deliver order, position, and balance data to TradeStation and Monex clients across web, desktop, mobile, and third-party APIs.

This is a growth role on an established quality engineering group. OXS has already invested in a purpose-built C# regression framework that replaced the team's legacy Postman suites, and your work will center on extending that framework, broadening its coverage, and making it reliable enough that developers trust it and run it themselves. You will be paired with senior SDETs rather than left to figure out a complex distributed system alone. We are looking for someone with a genuine instinct for breaking software, the patience to chase down an intermittent failure, and the judgment to tell a real defect from a flaky test.

What You’ll Be Doing:

Test Automation and Framework Work

Write, extend, and maintain automated tests in the OXS C# regression framework covering many domains
Create and manage automated testing suites including unit, component, integration, and end-to-end regression tests
Create, automate, and execute test plans that generate artifacts validating proper functioning of OXS services and provide quality-related metrics
Turn user stories and acceptance criteria into concrete test cases, including negative and failure-path scenarios
Contribute to framework extensibility and reusable test libraries rather than one-off scripts
Help build and maintain mocks, stubs, and simulated upstream dependencies so tests can run without contending for shared environments
Partner with Engineering Managers and Technical Leads to improve software quality and testability
Evaluate and introduce new testing tools, methodologies, and automation capabilities to improve engineering efficiency and product quality

Validating a Streaming Platform

Test gRPC streaming interfaces, REST APIs, and event-driven message flows the way our customers actually consume them
Validate correctness of streamed state — ordering, duplication, staleness, and reconciliation between OXS state and what downstream consumers receive
Verify behavior across account provisioning, sharding, and multi-tenant scenarios
Participate in load, stress, and soak testing to confirm the platform holds its latency and throughput expectations

Quality in the Delivery Pipeline

Execute functional and regression testing across the environments as work moves toward production
Support the team's change management flow, including validating change requests and recording test evidence for releases
Maintain test runs, results, and evidence in TestRail so every ticket has a traceable quality record
Support and improve regression execution in GitLab CI pipelines, including scheduled and on-demand runs
Help developers outside the SDET group run the regression suite locally — improve setup tooling, documentation, and onboarding so quality shifts left
Manage test account pools and reservations responsibly in shared environments, and help identify where additional capacity is needed
Identify quality risks early in the software development lifecycle and recommend mitigation strategies to engineering leadership
Identify quality risks early in the software development lifecycle and recommend mitigation strategies to engineering leadership
Represent quality engineering during planning, architecture, and release readiness discussions

Defects, Documentation, and Support

Identify, document, reproduce, and track defects with enough detail that another engineer can act without a conversation
Investigate test failures to determine whether the cause is a product defect, a framework issue, an environment problem, or a data problem
Participate in code reviews and provide guidance to the team on designing for testability
Contribute to production support and post-incident verification, including validating fixes and adding regression coverage for anything that reached customers
Raise quality and risk concerns early — developers write tests too, but this role is completely focused on quality

The Skills You Bring:

Hands-on experience with C# and .NET; ability to read and write production-quality test code, not just scripts
Experience with at least one test framework (xUnit, NUnit, MSTest, or equivalent)
Ability to translate requirements and acceptance criteria into thorough test cases
Experience testing REST APIs, and familiarity with streaming or bidirectional protocols (gRPC, WebSockets)
Database experience sufficient to validate data and state (SQL Server, NoSQL, Redis)
One or more scripting languages suitable for automation, such as Bash, PowerShell, or Python
Source control with Git, and familiarity with continuous integration tooling (GitLab CI preferred; Azure DevOps or Jenkins acceptable)
Familiarity with containerization and cloud-native technologies (Docker, Kubernetes, AWS)
API and network debugging tools (Postman, curl, Wireshark, browser developer tools)
A genuine passion for analysis and testing, with strong organization and prioritization skills
Demonstrated oral and written communication skills, and the ability to adapt and learn quickly
Willingness to be responsive during US equity and futures market hours, when release and support activity is concentrated
Demonstrated ability to write automated tests in an object-oriented language, whether from professional experience, internships, or substantial personal projects
Practical asynchronous programming and multithreading understanding preferred
Familiarity with event streaming or messaging systems, especially Apache Kafka or AWS MSK, preferred
Experience with mocking, stubbing, or service virtualization to isolate upstream dependencies preferred
Exposure to performance, load, or stress testing tools (k6, JMeter, Gatling, Locust) preferred
Familiarity with observability tooling for diagnosing failures (Grafana, Datadog, OpenTelemetry) preferred
Experience with a test management tool such as TestRail preferred
Familiarity with audited change management processes (e.g. ServiceNow) preferred
Comfort using AI tooling as part of daily engineering workflow — test generation, failure triage, and documentation — preferred
Agile development and Test-Driven Development practices preferred
Brokerage/trading platform experience preferred
Experience testing distributed, event-driven, or microservice-based systems preferred
Experience validating streaming or real-time data flows rather than request/response APIs alone preferred
Exposure to Kafka topics, partitions, consumer groups, and lag troubleshooting preferred
Experience building or maintaining a test automation framework, not only writing tests within one preferred
Experience in financial services, brokerage, trading, or another regulated, high-availability domain preferred

Minimum Qualifications:

Bachelor's degree in Computer Science, Engineering, or a related technical field, or equivalent work experience
3+ years of application testing or development experience
Professional working proficiency in English and Spanish
Ability to work core hours aligned to US market hours (approximately 9:00 AM – 5:00 PM ET)

Desired Qualifications:

2+ years of professional SDET, QA automation, or software development experience

What We Offer:

Collaborative work environment
Competitive Salaries
Yearly bonus
Comprehensive benefits for you and your family starting Day 1
Unlimited Paid Time Off
Flexible working environment
TradeStation Account employee benefits, as well as full access to trading education materials

SDET

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