QA Tester- Senior; Hybrid

Job Title

QA Tester
- Senior (Hybrid)

Denver, CO

4 months

Virtual / In-Person

Local to Denver; local travel only/none beyond local area. The qualifying questions also indicate the candidate must have the required skills and be okay going into the office.

• Design and execute test plans for RESTful APIs, Kafka message processors, and Redis-based job schedulers
• Build and maintain automated test suites (unit, integration, functional, end-to-end)
• Design and execute performance and load tests to validate system behavior under peak traffic, sustained load, and stress conditions
• Establish performance baselines, define SLAs (throughput, latency, error rates), and track regressions across releases
• Conduct soak tests to identify memory leaks, connection pool exhaustion, and resource degradation over time
• Validate Node.js library upgrades and dependency changes across the shared library ecosystem (lantern-utils, lantern-nest-utils, lantern-logger, lantern-requester, lantern-scheduler)
• Test containerized services in Docker and Kubernetes (EKS) environments
• Validate CI/CD pipelines (Git Lab CI) - ensure builds, tests, and deployments function correctly
• Perform regression testing for Node.js runtime upgrades (e.g., Node 18 ? Node 24 migrations)
• Collaborate with developers to define acceptance criteria and testability requirements
• Monitor and validate application performance using Datadog APM (dd-trace)
• Test Redis cluster interactions, DynamoDB operations, and Kafka consumer/producer flows
• Identify, document, and track defects through resolution

• Process Flows
• Mentor and Knowledge transfer to client project team members
• Participate as primary, co and/or contributing author on any and all project deliverables associated with their assigned areas of responsibility
• Participate in data conversion and data maintenance
• Provide best practice and industry specific solutions
• Advise on and provide alternative (out of the box) solutions
• Provide thought leadership as well as hands on technical configuration/development as needed.
• Participate as a team member of the functional team
• Perform other duties as assigned.

• QA Tester
• 5 10 years of QA/testing experience in backend or platform engineering
• Hands-on experience with performance and load testing tools
• Ability to analyze performance metrics such as P50/P95/P99 latencies, throughput, error rates, and CPU/memory utilization
• Strong experience with API testing tools
• Experience testing event-driven architectures and message queues
• Familiarity with Docker, Docker Compose, and Kubernetes-based deployments
• Experience with CI/CD pipelines
• Comfortable reading and writing Type Script/Java Script
• Experience with git workflows and branching strategies