Senior QA Engineer – Performance & API Automation

US Tech Solutions; Denver (CO); On-site; USD 65,000 - 87,000; Full time

Job summary

US Tech Solutions is seeking a QA/testing professional to design and execute test plans for RESTful APIs, Kafka processors, and Redis job schedulers in a fast-paced backend environment.

You will build automated test suites, run performance loads, and define SLAs while collaborating with developers on acceptance criteria and testability, ensuring robust CI/CD and containerized deployments for scalable systems.

Qualifications

• 5–10 years of QA/testing experience in backend or platform engineering.
• Hands-on experience with performance and load testing tools (k6, Artillery, JMeter, Gatling, or Locust).
• Ability to analyze performance metrics — P50/P95/P99 latencies, throughput, error rates, CPU/memory utilization.
• Strong experience with API testing tools (Postman, REST clients, curl, supertest).
• Experience testing event-driven architectures (Kafka, message queues).
• Familiarity with Docker, Docker Compose, and Kubernetes-based deployments.
• Experience with CI/CD pipelines (GitLab CI, Jenkins, or equivalent).
• Comfortable reading and writing TypeScript/JavaScript.
• Experience with git workflows and branching strategies.

Responsibilities

• 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.

Skills

QA/testing experience

Performance testing

API testing

Event-driven testing

Docker & Kubernetes

CI/CD pipelines

JavaScript/TypeScript

Git workflows

Tools

k6

Artillery

JMeter

Gatling

Locust

Postman

REST clients

curl

supertest

Job description

US Tech Solutions is seeking a QA/testing professional to design and execute test plans for RESTful APIs, Kafka processors, and Redis job schedulers in a fast-paced backend environment.

You will build automated test suites, run performance loads, and define SLAs while collaborating with developers on acceptance criteria and testability, ensuring robust CI/CD and containerized deployments for scalable systems.