Performance Architect

Helsinki, Finland Full-time

Performance Architect - In Memory Computing


RELEX is a fast-growing software company developing its own products that help retail companies plan and operate more efficiently. By accurately forecasting consumption of goods, we reduce inventory costs, increase availability and cut waste. One example of this is helping retailers eliminate spoiled food. RELEX is trusted by leading brands including WHSmith, Morrisons,, Coop Denmark and Rossmann, and has offices across North America and Europe. 

Relex produces a high-performance solution for supply chain management with a custom in-memory database. Our core business runs on applications with terabytes of heap memory and hundreds of threads. Our customers are the leading retailers around the world. We run a thousand instances of our software both on our own servers in multiple data centers on multiple continents, as well as on multiple public clouds.

Why we need you

Examples of areas in need of testing and tuning:

  • High performance computing related server hardware & BIOS/UEFI settings
  • Linux kernel versions & kernel options
  • JVM versions & JVM options (e.g. garbage collection algorithms)
  • Software options and optimizations

What we expect from you

You would need solid understanding on how modern server CPU and memory architectures work deep down. Things like cache hierarchies and X86 and similar architectures, volatile reads, NUMA areas, etc.


  • Interest in how to take the most out of hardware 
  • Experience in utilizing hardware vendor offering, CPU accelerations, etc.
  • Ability to communicate results and actions to infrastructure and product development teams
  • Software developer background is big plus (the core product is built with Java, so understanding Java development is relevant)

What we bring to the table

Relex is a flexible company. You can choose your own tools.

We are a rapidly growing company (over 50% YoY average) so there are constantly lots of new opportunities and technologies. Since we develop our own database and business logic as well as run our own servers, we have a lot of vertical technical competence in house.

We provide extensive healthcare, mobile benefit and broadband for your home. We have lots of sports activities, visiting office dogs, a brewing club, bicycle, music, retrocomputing and DIY enthusiasts etc.

We organize and attend meetups and go to conferences.

When hiring, we prefer people who are willing to relocate to the Engineering sites in Helsinki or Stoke. We might consider people working remotely in one of our country offices.

How to apply

Please submit your application and CV in English at . For more information on the position please contact Heini Matero by email at heini.matero[at] .

Apply for this opening at