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 test

📌 Senior SDET (Ciudad de México)
🏢 Tech Holding
📍 Ciudad de México