Senior Performance & Load Testing Engineer – NYC Onsite

REALIGN LLC; New York (NY); On-site; USD 130,000 - 190,000; Full time

Job summary

REALIGN LLC is seeking senior QA Engineers focused on performance and load testing for our high-scale platform. You will lead hands-on testing across HTTP/REST APIs, WebSockets, and event-driven components, ensuring scalability and reliability under heavy load.

Ideal candidates bring 7+ years in QA with 4+ years in performance, strong skills in k6, Locust, Gatling, or JMeter, and a deep grasp of observability tools to drive bottleneck remediation across distributed systems.

Qualifications

• 7+ years of QA Engineering experience with 4+ years focused on Performance Engineering and Load Testing.
• Hands-on Performance & Load Testing experience is non-negotiable.
• Deep expertise with k6 is preferred; experience with Locust, Gatling, or similar frameworks is required.
• Strong understanding of performance engineering principles including scalability, resiliency, throughput, latency analysis, and bottleneck identification.
• Experience with modern observability tooling including Grafana, Prometheus, Datadog, OpenTelemetry, distributed tracing, and APM platforms.
• Experience working with cloud-native, microservices-based, event-driven architectures.
• Proven ability to identify, analyze, and remediate complex performance issues across application, messaging, database, and infrastructure layers.

Responsibilities

• Design and execute performance, load, stress, spike, and endurance tests.
• Create realistic workload models and traffic patterns that reflect production usage.
• Analyze latency percentiles (P95/P99), throughput, error rates, and resource utilization.
• Collaborate with Engineering, Infrastructure, and Product teams to validate remediation efforts.
• Develop automated performance testing solutions integrated into CI/CD pipelines.

Skills

k6

Locust

Gatling

JMeter

Performance testing

Observability

Cloud-native

Distributed systems

APM tools

Load testing

Tools

Grafana

Prometheus

Datadog

OpenTelemetry

APM tools

Job description

REALIGN LLC is seeking senior QA Engineers focused on performance and load testing for our high-scale platform. You will lead hands-on testing across HTTP/REST APIs, WebSockets, and event-driven components, ensuring scalability and reliability under heavy load.

Ideal candidates bring 7+ years in QA with 4+ years in performance, strong skills in k6, Locust, Gatling, or JMeter, and a deep grasp of observability tools to drive bottleneck remediation across distributed systems.