Load Test Engineer

About the Position

Load Test Engineer

Greece

Cyrex, a Magic Media company, is a media and tech start-up powered by creativity and innovation. We work with leading developers and publishers in the games industry, providing support and solutions designed around individual needs and carried out by global experts.

For more than a decade, Cyrex has secured and stress-tested the products of some of the world’s most demanding technology companies, from global entertainment platforms to regulated financial and healthcare infrastructure. We’re a small team, but we’ve built a client list and track record that go well beyond our size.

Load testing is one of the things we’re best known for.

Studios and platform teams come to us ahead of a launch, major release, or marketing push, the point where years of work suddenly meets a very large number of simultaneous users, with no opportunity for a second attempt. Our job is to simulate that moment before it happens, find what breaks, understand why, and work alongside the customer to fix it.

We do this using a load-testing platform we built ourselves. It’s mature, proven, and already in production. Part of your role will be keeping it that way: maintenance, bug fixes, dependency and infrastructure upgrades, and targeted improvements when an engagement requires them.

The platform spans a Go backend, two React frontends, and AWS infrastructure capable of spinning up enough load generation to put serious systems under real strain.

Platform maintenance isn’t a full-time job, though, and we won’t pretend it is. The larger part of this role is the load testing itself.

That starts with test engineering: designing scenarios that accurately model how real users behave and implementing them in Python against whatever protocols the customer’s system happens to use.

It also means working directly with customers. Our load testing is expert-led; we don’t hand over a dashboard and disappear. We work through iterations with the customer’s engineering team: agree on what we’re trying to prove, build the scenario, run the test, analyse the results together, identify the bottleneck, make changes, and go again.

You’ll be part of those sessions and, as you grow into the role, expected to lead them.

That combination is why we’re looking for someone with range rather than a narrow specialist. This role sits somewhere between software engineering, performance engineering, systems analysis, and technical delivery, and you need to be comfortable moving between all four.

Responsibilities

• Designing and implementing load testing scenarios in Python
• Maintaining and improving the load-testing platform
• Collaborating with customers to identify and resolve performance bottlenecks
• Conducting expert-led load testing sessions

Requirements

• 4+ years of software engineering experience, with meaningful ownership of what you shipped.
• Strong Python skills. This is the core language for the role.
• Hands-on cloud experience, ideally with AWS, including infrastructure as code and containers, and an understanding of what happens technically and financially when infrastructure is scaled aggressively.
• Enough breadth to confidently maintain a typed backend and React frontend you didn’t originally build, even if neither is your primary specialism.
• A practical understanding of distributed systems and their failure modes, including timeouts, back-pressure, connection limits, resource contention, and the difference between a system that is slow and one that is actually failing.
• The communication skills to lead a technical session with a customer, explain what you’re seeing clearly, and make sound engineering recommendations.
• Excellent spoken and written English.

Nice to Have

• Experience with performance or load-testing tools such as Locust, k6, JMeter, Gatling, or tooling you’ve built yourself.
• Experience with games, real-time systems, or high-traffic consumer platforms.

We Offer

• The opportunity to work on systems behind products used by very large numbers of people, at the moments when reliability matters most.
• A role that combines hands-on engineering, deep technical problem-solving, and customer delivery rather than being purely a ticket queue or purely consultancy.
• Real ownership of a mature load-testing platform that is already built, proven, and working, with the freedom to improve it as our needs evolve.
• Room to grow with Cyrex. As you build expertise and take on more responsibility, there are opportunities to lead larger and more complex engagements, deepen your technical ownership, help shape how we approach performance engineering, and grow into broader technical or team leadership roles.
• Direct contact with the engineering teams you’re helping, with the opportunity to become a trusted technical counterpart to some of the world’s most demanding technology companies.
• Direct access to founders and leadership, with decisions made in days rather than quarters.
• Competitive compensation with straightforward, regular reviews.
• A small, multicultural team where your contribution is visible and where there is room to shape your role as the company evolves.

About the Company

Cyrex, a Magic Media company, is a media and tech start-up powered by creativity and innovation. We work with leading developers and publishers in the games industry, providing support and solutions designed around individual needs and carried out by global experts.