Job Title
QA Tester- Senior (Hybrid)
Location
Denver, CO
Duration
4 months
Interview Type
Virtual / In-Person
Note
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.
Description
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 (GitLab 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
Deliverables
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.
Top Skills
| S.No Skill Requirement | |
| 1 | QA Tester |
| 2 | 5 10 years of QA/testing experience in backend or platform engineering |
| 3 | Hands-on experience with performance and load testing tools |
| 4 | Ability to analyze performance metrics such as P50/P95/P99 latencies, throughput, error rates, and CPU/memory utilization |
| 5 | Strong experience with API testing tools |
| 6 | Experience testing event-driven architectures and message queues |
| 7 | Familiarity with Docker, Docker Compose, and Kubernetes-based deployments |
| 8 | Experience with CI/CD pipelines |
| 9 | Comfortable reading and writing TypeScript/JavaScript |
| 10 | Experience with git workflows and branching strategies |
Recruiter
Contact: Kris - kris@gsksolutions.com
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