Senior Performance Test Engineer

Nix; Boston (MA); Hybrid; USD 120,000 - 160,000; Full time

Benefits offered by this job

Flexible working format

Competitive salary

Career growth

Education reimbursement

Tech talks and trainings

Job summary

N-iX, a global software development company, is seeking a Non-Functional Test Engineer in Boston, MA. You will design, implement, and maintain automated tests to evaluate performance, stability, scalability, and resilience across distributed systems.

You will collaborate with development, QA, platform, and DevSecOps teams to embed non-functional testing into our release process, run load and stress tests, and translate findings into automated regression scenarios for CI/CD pipelines.

Qualifications

• Strong experience with performance and load testing across distributed systems.
• Ability to design tests for throughput, bottlenecks and reliability.
• Experience with CI/CD pipelines and test automation.

Responsibilities

• Design, develop, and execute non-functional test scenarios (load, stress, scalability).
• Simulate real-world traffic to validate system performance and resilience.
• Identify bottlenecks across API, database, infra, and network layers.
• Collaborate with developers, DevSecOps, QA, product, and infra teams on test objectives.
• Prepare detailed test reports with metrics, risks, and recommendations.
• Support performance testing within CI/CD pipelines.

Skills

Performance testing

Load testing

Kubernetes

Observability

CI/CD integration

Scripting

Reproducing issues

Tools

k6

Gatling

JMeter

Locust

Prometheus

Grafana

OpenTelemetry

Job description

N-iX is a global software development company founded in 2002, connecting over 2,400+ tech professionals across 40+ countries. We deliver innovative technology solutions in cloud computing, data analytics, AI, embedded software, IoT, and more to global industry leaders and Fortune 500 companies. Join us to create technology that drives real change for businesses and people across the world.

We are looking for a Non-Functional Test Engineer who can design, implement, and maintain automated tests that evaluate the performance, stability, scalability, and resilience.

The role will focus on reproducing realistic enterprise workloads and failure conditions to identify bottlenecks and reliability issues before they reach customers. The engineer will work closely with development, QA, platform, and DevSecOps teams to define measurable performance expectations and integrate non-functional testing into our release process.

Key Responsibilities:

• Design, develop, and execute non-functional test scenarios covering load, stress, scalability, endurance, failover, and resilience testing.
• Simulate real-world user traffic and peak load conditions to validate system performance.
• Identify performance bottlenecks across application, database, API, infrastructure, and network layers.
• Work closely with developers, DevSecOps, QA, product, and infrastructure teams to define test objectives and acceptance criteria.
• Prepare detailed test reports including observations, bottlenecks, metrics, risks, and recommendations.
• Support performance testing as part of CI/CD pipelines where applicable.

Skills required:

• Strong experience with performance and load testing, preferably using tools such as k6, Gatling, JMeter, Locust, or similar.
• Experience designing load, stress, scalability, endurance and resilience tests.
• Good understanding of HTTP APIs, distributed systems, concurrency, queues and asynchronous processing.
• Experience with Kubernetes / containerized environments.
• Ability to analyse CPU, memory, JVM heap, disk, network and application metrics.
• Experience with observability tools such as Prometheus, Grafana, OpenTelemetry or similar.
• Experience integrating non-functional tests into CI/CD or scheduled test pipelines.
• Scripting/programming skills in a language suitable for test automation.
• Ability to work with developers to reproduce production/customer performance problems and turn them into automated regression scenarios.

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers