Senior SDET - Test Automation & Performance Engineering | Contract | Remote MX

Sobre el puesto

About us:

Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients. Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability.

The Role:

We are looking for a Senior SDET / Test Automation Engineer for a project based assignment to build the automated testing and release systems that ensure our products remain reliable as traffic, data volume, integrations, partners, and release velocity increase. This is a hands-on engineering role focused on test automation, API and integration testing, performance and scalability testing, and CI/CD quality gates within an AWS-based environment.
This is not a manual QA position. You will design and build reusable test infrastructure, automate critical product and partner workflows, create realistic performance scenarios, and provide engineering teams with clear evidence of whether a release is ready for production.
You will work closely with engineering teams and the Performance & Reliability Engineering Lead to ensure quality and scalability are built into the development lifecycle rather than treated as a final release checkpoint.

Key Responsibilities:

• Design and evolve the automated testing architecture across products and engineering teams

• Build and maintain automated API, integration, contract, end-to-end, regression, and UI tests where appropriate

• Develop reusable test frameworks, fixtures, synthetic data, mocks, and environment strategies

• Build automated testing for distributed services and integrations running within AWS environments

• Design and execute load, stress, spike, soak, scalability, degradation, and recovery tests

• Translate performance and capacity scenarios into repeatable automated test suites with measurable pass/fail thresholds

• Model realistic workloads, concurrency levels, traffic patterns, data volumes, and dependency behavior

• Integrate automated suites into CI/CD pipelines and establish enforceable quality and release gates

• Create automated release checks tied to quality, latency, reliability, and performance thresholds

• Establish practices for identifying, quarantining, diagnosing, and eliminating flaky tests

• Improve test observability and failure reporting so engineers can quickly understand and diagnose issues

• Build and maintain reliable test data and test environment strategies

• Debug failures across APIs, services, databases, infrastructure, and external integrations

• Partner with Performance & Reliability Engineering to validate scalability assumptions and production readiness

• Partner with Security Engineering on permissions, isolation, negative-path, and abuse-related test scenarios

• Track testing trends and help reduce escaped defects, flaky tests, manual release effort, and regression risk

• Coach engineers on testability, automation, quality ownership, and defect-prevention practices

Required Skills:

• Strong experience as an SDET, Software Engineer in Test, Test Automation Engineer, Quality Engineer, or similar engineering-focused testing role

• Strong software development and test automation skills

• Experience testing APIs, distributed services, integrations, and cloud-based applications

• Hands-on experience working within AWS environments

• Strong experience building automated API and integration test frameworks

• Hands-on performance and scalability testing experience using tools such as k6, Gatling, Locust, JMeter, or equivalent

• Experience designing realistic performance workloads rather than simply executing predefined load tests

• Experience with load, stress, spike, soak, and scalability testing

• Strong experience integrating automated tests into CI/CD pipelines

• Experience establishing automated quality gates and release criteria

• Experience with contract testing and testing across service boundaries

• Strong understanding of test-data management, synthetic data, fixtures, mocks, and environment reliability

• Experience using logs, metrics, traces, and other observability tools to diagnose test and system failures

• Strong debugging skills across applications, APIs, infrastructure, databases, and integrations

• Experience identifying and reducing flaky or unreliable automated tests

• Ability to influence engineering teams and promote shared ownership of quality without becoming a centralized testing bottleneck

Nice to have:

• Experience testing high-scale SaaS or distributed platforms

• Experience with AWS services supporting highly available or distributed applications

• Experience testing systems with significant traffic, concurrency, or availability requirements

• Experience with resilience, failure injection, dependency degradation, or recovery testing

• Experience with infrastructure-as-code and ephemeral or automated test environments

• Experience with security-adjacent testing, including permissions, authentication, authorization, isolation, and negative-path scenarios

• Identity, DNS, registry, or security domain experience

• Experience building quality or test platforms used across multiple engineering teams

What Success Looks Like
Within your first several months, you will have:

• Established a clear risk-based automation strategy across critical product and partner workflows

• Built reliable automated regression, API, integration, and contract test coverage

• Created repeatable performance and scalability tests for the platform's highest-risk journeys

• Established realistic test-data and environment strategies

• Integrated critical test suites…