Software Quality Engineer - Performance & Load Testing in New York

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

Job Description

Location: New York City, NY-Onsite

Openings: 2 positions

Experience: 10+ years of professional software engineering experience

Interview Mode: In-person

Job Summary

We are seeking a Software Quality Engineer specialising in Performance and Load Testing to build tooling and infrastructure that generate realistic, production-like workloads for large-scale testing. This software-engineering-focused role involves developing traffic-replay systems, processing API and event logs, and transforming large datasets into reusable test scenarios. The engineer will enable teams to reproduce performance issues, investigate bottlenecks, and validate remediation.

Key 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.
• Use approved LLM-assisted workflows to analyse appropriately protected exports, identify traffic patterns, and accelerate test-scenario and workload modelling.
• Automate conversion of raw traffic data into reusable load-test configurations and scripts.
• Control traffic volume, concurrency, request sequencing, timing, dependencies, and event relationships during replay.
• Build scalable data-processing pipelines for large production datasets.
• Integrate replay tooling with performance-testing platforms and CI/CD pipelines.
• Analyse replay results, investigate root causes, and partner with application engineers on remediation.
• Collaborate with developers, QA, SRE, DevOps, and infrastructure teams to reproduce performance issues.
• Develop debugging and diagnostic capabilities and automate performance-regression testing across releases.
• Document tooling, workflows, test scenarios, and performance findings.

Required Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or a related technical field.
• 6+ years of professional software engineering experience.
• Strong programming skills in Python, Java, Go, C++, or a similar .
• Strong understanding of HTTP, REST APIs, JSON, WebSockets, event-driven architectures, and distributed systems.
• Experience building automation, developer tooling, or data-processing systems.
• Experience working with large datasets, logs, or high-volume production telemetry.
• Strong understanding of latency, throughput, concurrency, resource utilisation, and scalability.
• Experience with databases and SQL.