Software Development Engineer in Test (SDET) (Mexico)

Job Summary: 

We're hiring an Software Development Engineering in Test (SDET) to embed with our Platform team. Platform builds the shared services every Neumo application consumes: reporting, payments, search, authentication, messaging, file handling, and more. Our guiding principle is build once, use everywhere -- and that means quality has to scale the same way.

This is not a QA-at-the-end role. You'll be in the room when we design services, shaping what 'done' means before a line of code is written. You'll execute against an established QA strategy and set of frameworks, with QA leadership provided by a senior team member who has deep context on how everything fits together. Your focus is on building and running great tests -- across unit, integration, contract, and end-to-end layers. Because Platform services are consumed by many products simultaneously, a defect here is a defect everywhere. You'll own quality as a first-class concern, not an afterthought.

Duties and Responsibilities:

• Design, build, and maintain automated test frameworks across unit, integration, contract, and end-to-end layers for Node.js shared services.
• Participate in service design and API reviews from day one, contributing a quality-engineering perspective before implementation begins.
• Build and maintain CI/CD test pipelines that give the team fast, reliable feedback on every commit.
• Own test coverage for multi-tenant scenarios: tenant isolation, data separation, per-tenant configuration, and cross-tenant security boundaries.
• Write and maintain automated tests against AWS-native infrastructure -- Lambda, EventBridge, SQS/SNS, API Gateway -- including event-driven and async patterns.
• Define and enforce API contract testing so downstream product teams can integrate with confidence.
• Instrument test runs for observability: flakiness tracking, coverage trends, and test health dashboards.
• Monitor and track quality metrics -- test coverage trends, defect escape rates, flakiness -- and surface insights to the team regularly.
• Validate rollback and recovery behavior: ensure services degrade gracefully and recover correctly under failure conditions.
• Apply privacy and data protection considerations in test design: avoid using real PII in test data, validate data handling on sensitive paths, and flag compliance gaps.
• Identify and drive resolution of systemic quality gaps; bring data, not just opinions.
• Use AI coding tools (Claude Code, Cursor) as part of your daily workflow, and apply the same rigor to reviewing AI-generated test code as any other code.
• Partner with back-end engineers to raise the quality bar across the team -- pairing, code reviews, and shared ownership of what we ship.

Education and Experience:

• 4+ years of SDET or quality engineering experience working on production back-end systems.
• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
• Experience testing microservices and event-driven systems -- you know how to test async flows, not just synchronous request/response.
• Solid experience with CI/CD pipelines and integrating test suites into them (GitHub Actions, CircleCI, or similar).
• Experience testing against cloud infrastructure, ideally AWS.
• Experience testing multi-tenant SaaS platforms, especially around isolation and security boundaries.
• Hands-on experience with AWS serverless specifically: testing Lambda functions, EventBridge rules, and SQS/SNS workflows.
• Experience with performance and load testing frameworks (k6, Artillery, or similar).
• Experience testing payments integrations or familiarity with PCI compliance requirements.
• Experience with infrastructure-as-code and testing infrastructure changes (SAM, CloudFormation, or similar).
• Experience working with AI-assisted development tools in a production codebase.

Knowledge, Skills and Abilities:

• Strong understanding of relational databases (we use PostgreSQL) and how to test data integrity and migrations.
• Excellent written and verbal communication. Much of our team is distributed, so clear async communication matters.
• Highly motivated, self-guiding, and a constant learner who still loves contributing to team design and discussion.
• Solid experience writing tests in JavaScript or TypeScript, with frameworks like Jest, Mocha, Playwright, or Selenium; familiarity with the Page Object Model (POM) pattern is a plus.
• Hands-on experience with API testing and contract testing (Pact or equivalent).

Work Environment:

• Office setting with a moderate noise level.
• The employee will work at an individual workstation, using a telephone and computer.

 Physical Demands:

• Must be able to remain seated for extended periods.
• Regular use of a computer and other office machinery, such as printers and copy machines.
• Occasional movement around the office.
• Frequent communication via telephone.

Neumo Summary:

With the backing of four decades of public sector expertise and corporate capability, Neumo has successfully supported government services. Neumo was honored and recognized for four (4) consecutive years as a GovTech 100 Company representing the top 100 companies focused on making a difference in and selling to state and local government agencies across the United States.

Neumo is committed to helping communities thrive and brings a wealth of experience combined with innovation. Today, Neumo offers more administrative and financial support to government officials than any other organization. And with a responsive, client-focused approach, we foster partnerships that give our customers the certainty they need to accomplish more.

Neumo offers a competitive benefits and compensation package and are looking for team members who will thrive in our dynamic environment.

Neumo is an Equal Opportunity Employer. Selection for a position will be made without regard to race, religion, national origin, sex, political affiliation, marital status, non-disqualifying physical handicap, and age.