Strong understanding of programming concepts, including algorithms, complexity, and data structures., Good knowledge of the data structures in the Java standard library - both breadth and internals., Experience building distributed service-based applications based on message queues., Strong analytical and problem-solving skills, to effectively diagnose production performance issues measured in microseconds., Open mind, curiosity, and a strong desire to learn new technologies and business domains., Ability to clearly explain non-trivial systems and algorithms., Ability to follow and understand technical conversations., Know when and how to ask questions that speed up learning., Ability to align your working schedule to US Eastern business hours., Experience with financial markets and trading systems., Knowledge of AWS systems., Experience with Spring boot (some teams)., Experience with JVM tuning (some teams)., Experience working remotely with North American firms., A computer science degree from a top Polish school.