QA Engineer - Performance & Load Testing

Motion Recruitment; New York (NY); On-site; USD 83,000 - 124,000; Full time

Job summary

Motion Recruitment in New York, NY is seeking a hands-on QA Engineer for Performance & Load Testing to help a financial services division during a major platform merger.

You will write modular test code in JavaScript/TypeScript, build protocol clients, and execute high-volume load tests across HTTP, APIs, and websocket traffic, partnering with engineering to eliminate bottlenecks.

Qualifications

• Deep hands-on experience creating scalable load tests.
• Expertise with JavaScript/TypeScript testing.
• Strong knowledge of protocols: protobuf, gRPC, WebSockets.
• Experience with k6 for performance testing.

Responsibilities

• Develop modular test code and load scenarios.
• Build protocol clients (protobuf, gRPC, WebSockets) and drive tests.
• Run load tests across HTTP/API and event traffic.
• Analyze latency percentiles, error rates, and throughput.
• Collaborate with engineers to optimize platform performance.

Skills

JavaScript/TypeScript

Hands-on IC

Performance testing

Load testing

Tools

k6

HTTP APIs

WebSockets

gRPC

protobuf

Job description

Job Title: QA Engineer - Performance & Load Testing

Location: New York, NY (Hybrid - 2-3 days onsite)

Type: Long-Term Contract (1+ years, potential to extend or convert)

The Opportunity

We are helping a global financial services giant scale their premium dining division through a massive platform merger. If you want to build highly scalable, real-time infrastructure that powers millions of daily transactions, this is your chance. We need a 100% hands-on Performance & Load Testing expert to drive system stability and tackle massive high-volume traffic challenges.

What You'll Do

• Write maintainable, modular test code in JavaScript or TypeScript.
• Build custom protocol clients (protobuf, gRPC, websockets) and design complex, data-driven load test scenarios.
• Execute robust load tests across HTTP/API and event/websocket traffic.
• Perform deep performance analysis by tracking latency percentiles, error rates, and throughput limits.
• Trace, pinpoint, and resolve complex infrastructure and application bottlenecks.
• Partner directly with engineering teams to optimize performance for a premier global platform.

What You Need

• Extensive, hands-on expertise with k6 and strong coding skills (JavaScript/TypeScript).
• Deep background in testing custom protocols (protobuf, gRPC, WebSockets) and HTTP/APIs.
• Demonstrated ability to build scale-scenarios and isolate performance bottlenecks.
• A strict commitment to working entirely as a hands-on individual contributor.

This is a long-term, highly visible role offering a flexible pay rate based on your exact expertise. You will be directly responsible for the performance of a premier global platform during a critical merger.