Senior Performance QA Engineer

Responsibilities

Define and execute comprehensive performance test strategies, including load, stress, and endurance testing across various system architectures. Collaborate with development and SRE teams to identify bottlenecks, implement performance benchmarks, and integrate testing into CI/CD pipelines.

Requirements

Requires 4+ years of performance testing experience with hands-on proficiency in Gatling, k6, and scripting in Scala, Java, or TypeScript. Candidates must have a strong understanding of microservices, cloud platforms, and observability tools to analyze system performance and capacity.

Skills

• Performance testing
• Gatling
• K6
• JavaScript
• TypeScript
• Scala
• Java
• HTTP
• REST APIs
• WebSockets
• Microservices
• Kubernetes
• Docker
• CI/CD
• Grafana
• Prometheus

Benefits

• Medical insurance
• Mental health support
• Financial consultations
• Legal consultations
• Udemy access
• Language courses
• Company-paid certifications
• Internal events

About this role

Ciklum is looking for a Senior Performance QA Engineer to join our team
full-time in Ukraine.

We are a custom product engineering company that supports both multinational
organizations and scaling startups to solve their most complex business
challenges. With a global team of over 4,000 highly skilled developers,
consultants, analysts and product owners, we engineer technology that redefines
industries and shapes the way people live.

About the role:

As a Senior Performance QA Engineer, become a part of a cross-functional
development team engineering experiences of tomorrow. You will join a highly
motivated team and will be working on a modern solution for our existing client.
We are looking for technology experts who want to make an impact on new business
by applying best practices and taking ownership.

Responsibilities:

* Define performance test requirements and performance test strategy
* Design, implement and execute performance test plans and scenarios using
Gatling and k6
* Develop and maintain load testing scripts for APIs, microservices, front-end
and back-end systems
* Execute load, stress, volume, spike and endurance tests
* Analyze system performance, identify bottlenecks and capacity issues, and
recommend tuning strategies
* Define and implement SLAs, performance benchmarks and KPIs for services
* Integrate performance testing into CI/CD pipelines (e.g. GitLab CI, GitHub
Actions)
* Monitor and report performance metrics using Grafana, Prometheus, InfluxDB or
cloud- native observability stacks
* Create and maintain test artifacts (plans, reports, dashboards) and
communicate results to stakeholders
* Collaborate with development, SRE and QA teams to interpret results and drive
improvements
* Participate in incident analysis and postmortems where performance regression
is suspected

Requirements:

* 4+ years of experience in performance testing
* 2+ years of hands-on experience with Gatling (Gatling DSL; Gatling Cloud is a
plus)
* Hands-on experience with k6, including scripting in JavaScript/TypeScript
* Proficiency in Scala or Java for Gatling scripting
* Strong knowledge of HTTP, REST APIs, WebSockets and asynchronous event-driven
systems
* Understanding of end-to-end performance measures (response time, throughput,
latency, error rate) and scalability
* Solid understanding of load patterns, ramp-up strategies and test
environments
* Experience testing microservices architectures (e.g. Kubernetes, Docker,
Istio)
* Experience with APM and monitoring tools (e.g. Datadog, New Relic,
AppDynamics), including analysis of JVM-level metrics and logs
* Ability to set up the performance testing process from scratch and plan
performance testing activities
* Experience with setting up performance jobs in CI tools (GitLab CI, Jenkins)
* Experience with cloud platforms (AWS, GCP or Azure)
* Upper-Intermediate English or higher

Desirable:

* Experience with other performance testing tools (JMeter, Locust)
* Experience with Grafana Cloud k6 or distributed load generation
* Experience building performance dashboards in Grafana for Gatling/k6 results

Personal skills:

* Good analytical skills and strong interest in problem analysis and tuning
* Excellent problem-solving, communication and collaboration skills
* Good team player, motivated to solve complex tasks
* Self-motivated, self-disciplined and result-oriented
* Strong attention to detail and accuracy

What’s in it for you?

* Strong community: Work alongside top professionals in a friendly, open-door
environment
* Growth focus: Take on large-scale projects with a global impact and expand
your expertise
* Tailored learning: Boost your skills with internal events (meetups,
conferences, workshops), Udemy access, language courses, and company-paid
certifications
* Endless opportunities: Explore diverse domains through internal mobility,
finding the best fit to gain hands-on experience with cutting-edge
technologies
* Flexibility: Enjoy radical flexibility – work remotely or from an office,
your choice
* Care: We’ve got you covered with company-paid medical insurance, mental
health support, and financial & legal consultations

About us:

At Ciklum, we are always exploring innovations, empowering each other to achieve
more, and engineering solutions that matter. With us, you’ll work with
cutting-edge technologies, contribute to impactful projects, and be part of a
One Team culture that values collaboration and progress.

As one of Ukraine’s largest IT companies and a top employer recognized by
Forbes, we’ve spent over 20 years delivering meaningful tech solutions. We
proudly support diverse talent and military veterans, recognizing their unique
skills and perspectives they bring to shaping the future.

Explore, empower, engineer with Ciklum!

Interested already? We would love to get to know you! Submit your application.
We can’t wait to see you at Ciklum.

#LI-MH1

About Ciklum

IT Services and IT Consulting · 1,001-5,000 employees · headquartered in London, England · founded 2002