Senior QA Automation Engineer - Remote Eligible

Maintain Automated Test Suite

Maintain an automated test suite for a large legacy JavaScript/TypeScript codebase for an application designed to run on embedded Linux devices and cloud containers for industrial applications. Automate tests that ensure robust Modbus RTU/TCP communications and stable behavior for unstable networks for an application running on resource-constrained hardware.

Extend existing test suite to work with new replacement application written in .NET, ensuring consistency of behavior and feature parity. Additionally, maintain an automated test suite for the companion Nuxt-based operational/configuration web UI.

Key Responsibilities

• Maintain and extend automated test coverage for a large legacy JavaScript/TypeScript codebase targeting embedded Linux devices and cloud containers.
• Integrate automated tests into the continuous integration and delivery (CI/CD) pipelines
• Set up and manage test environments to accurately represent the production environment
• Troubleshoot and resolve bugs as they arise from the globally deployed population of devices and users
• Stabilize legacy Javascript/TypeScript product quality, add & perform characterization tests where needed
• Support the transition to a new .NET-based application by ensuring feature parity and consistent behavior through automated regression testing.
• Manage and maintain test data, including generating or acquiring representative data sets.
• Define and track quality assurance test metrics and report outcomes. Update test cases in requirement tracking tools for traceability.
• Write and maintain detailed test documentation, including test plans, test cases, and test scripts explanation.

Edge Web UI

• Maintain, extend and optimize automation test suite for Nuxt web UI admin screens for configuration, monitoring, and diagnostics; optimize rendering and bundle size for low-power devices.
• Validate UI performance and rendering efficiency on resource-constrained edge devices.

Field Communications

• Use knowledge of TCP/IP networking to troubleshoot issues that arise from high-latency, small-MTU, high-packet-loss metered networks and, when necessary, modify code to better handle these networks
• Maintain automated tests to validate Modbus RTU/TCP communications and ensure stability under high-latency, low-bandwidth, and high-packet-loss network conditions.
• Maintain automated tests for legacy communication interfaces (e.g., OSISoft/Aveva PI, KepServerEX)
• Use deep knowledge of TCP/IP networking to simulate and troubleshoot issues in metered or unstable network environments
• Contribute to protocol compliance and reliability testing across industrial integration points

Embedded Linux Operations

• Support and validate optimization efforts for CPU and memory utilization and refactor code to minimize flash wear
• Support and validate device health/status "scraping" code that collects device temperature, signal strength, memory and CPU usage, docker stats, etc.
• Support and validate device health/status "scraping" code that monitors network status, internal modem status (mmcli, nmcli) and external modem status (JSON-RPC or SSH-based status retrieval)
• Support and validate integration with external industrial routers (e.g., Teltonika RUT series) when internal modems aren't applicable; align with project-specific approvals and wiring practices.
• Testing with real hardware and physical devices

Security & Reliability

• Consider and support security best-practices; least privilege, secret handling, signed artifacts
• Analyze and validate implementation for unplanned power loss and degraded communication links, targeting graceful recovery and minimal data loss

Required Skills

12+ yrs experience as QA working with Node.js/TypeScript; 4+ yrs with command-line applications/services; 12+ yrs with automated testing suites/frameworks

• Experience in developing and maintaining test automation frameworks and scripts using industry-standard tools and libraries. Ability to write efficient, scalable, and maintainable code for automated tests.
• Excellent problem-solving skills and ability to work independently and collaboratively
• Excellent communication skills, both written and verbal:
• Strong English proficiency and the ability to clearly communicate and understand abstract concepts
• Ability to effectively interact with team members and stakeholders.
• Ability to work collaboratively in cross-functional teams and contribute to problem-solving processes.
• Passionate about troubleshooting and debugging issues
• Experience with common test frameworks and proficiency in Python, JavaScript, C# for test automation.
• Modbus RTU/TCP expertise; serial bus troubleshooting (RS-485/RS-232)
• Networking knowledge, dealing with high-latency networks, small MTUs, packet loss, and metered networks
• Experience with IoT device testing and validation, including hardware, firmware, and software components. Developed automated test cases/scripts based on requirements or acceptance criteria.
• Proficiency in test management and bug tracking tools. Understanding of test case management, test execution tracking, and defect lifecycle processes.
• Experience in testing distributed applications and their interactions across microservices architecture.
• Experience with build process automation, CI/CD pipelines and tools such as Jenkins, Artifactory, and Bitbucket.

Desired Skills

• Experience working with Agile toolsets and technologies such as Jira, Confluence, and Bitbucket.
• Ability to independently deploy and install cloud-native microservices on platforms.
• Familiarity with industry IoT standards and protocol such as MQTT/SparkplugB, ZeroMQ, ProtoBuf, Kafka, and HTTP
• Strong experience of Linux, Bash, Shell scripting, Docker, TCP/IP Networking, Kubernetes, and excellent debugging skills
• Cellular on Linux: hands-on with mmcli (modem state, APN/profile, SIM/PIN ops) and nmcli (connections, metrics, metered profiles, link selection). (Internal playbooks reference nmcli for link testing.)
• 3+ years working with Docker or other containerization technologies
• CI/CD & Release: multi-OS runners, artifact signing, SBOMs/vuln scanning
• Proficiency in JavaScript/TypeScript and .NET is plus