Performance Load Test Engineer - Traffic Replay Tooling

Energy Jobline ZR; New York (NY); On-site; USD 150,000 - 190,000; Full time

Job summary

Energy Jobline ZR in New York City is seeking a Software Quality Engineer specializing in Performance and Load Testing to design tooling that generates realistic workloads for large-scale tests. You will build traffic-replay systems, analyze logs, and transform data into reusable test scenarios to help teams reproduce performance issues.

The role collaborates with developers, QA, SRE, DevOps, and infrastructure teams, leveraging LLM-assisted workflows to analyze protected exports and accelerate

Qualifications

• Bachelor’s degree in CS or related field.
• 6+ years of professional software engineering experience.
• Strong programming in Python, Java, Go, or C++.
• Strong understanding of HTTP, REST APIs, JSON, WebSockets, and distributed systems.

Responsibilities

• Design and build traffic-replay and workload tooling for performance and load testing.
• Develop systems that replay realistic HTTP/API requests, event traffic, WebSocket interactions, and asynchronous workloads.
• Parse API, application, event, and telemetry logs to identify representative production traffic patterns.
• Transform large log exports into structured, parameterised, replayable test scenarios.
• Build tooling to clean, normalise, anonymise, correlate, and enrich production traffic data before replay.
• Automate conversion of raw traffic data into reusable load-test configurations and scripts.

Skills

Python

Java

Go

C++

Performance testing

Load testing

Distributed systems

Education

Bachelor’s degree in Computer Science / Software Engineering

Tools

Traffic replay tooling

Data processing pipelines

Job description

Energy Jobline ZR in New York City is seeking a Software Quality Engineer specializing in Performance and Load Testing to design tooling that generates realistic workloads for large-scale tests. You will build traffic-replay systems, analyze logs, and transform data into reusable test scenarios to help teams reproduce performance issues.

The role collaborates with developers, QA, SRE, DevOps, and infrastructure teams, leveraging LLM-assisted workflows to analyze protected exports and accelerate