Java Backend Engineer — AWS & Microservices (Trading)

HL TECH Poland; Warszawa; Hybrid; PLN 153,000 - 218,000; Full time

Job summary

HL Tech Poland is building and modernising trading platforms for millions of investors, with a focus on reliable, end-to-end services. You will own backend components, design scalable REST APIs, and operate cloud services in AWS within a Poland/UK engineering collaboration.

The role emphasizes ownership beyond delivery, strong production discipline, and collaboration across teams. Remote/hybrid location is supported with potential Warsaw office access.

Qualifications

• Strong commercial experience building backend applications in Java using Spring Boot.
• Production AWS experience.
• Experience designing and integrating REST APIs and microservices.
• Experience owning services in production, including monitoring, incident investigation and reliability improvements.
• Experience working with distributed, event‑driven or highly available systems.
• Understanding of observability practices, including metrics, tracing, logging and monitoring.
• Understanding of testing, maintainability, security and engineering best practices.
• Experience with containers and Kubernetes.
• English at C1 level and Polish at B2 level or higher.

Responsibilities

• Build and improve backend services using Java and Spring Boot.
• Design and implement REST APIs and multi-service flows.
• Develop and operate cloud services in AWS.
• Write secure, maintainable and testable code, supported by automated tests.
• Support business‑critical production systems and investigate incidents.
• Use metrics, tracing, logging and monitoring to improve reliability.
• Contribute to solution design, technical discussions and code reviews.
• Collaborate with Product and engineering colleagues across Poland and the UK to design, build and improve trading services.

Skills

Java

Spring Boot

AWS

REST APIs

Microservices

Kubernetes

Observability

Testing

Security

Distributed systems

Tools

Terraform

Hibernate/JPA

Docker

Node.js

React

Job description

HL Tech Poland is building and modernising trading platforms for millions of investors, with a focus on reliable, end-to-end services. You will own backend components, design scalable REST APIs, and operate cloud services in AWS within a Poland/UK engineering collaboration.

The role emphasizes ownership beyond delivery, strong production discipline, and collaboration across teams. Remote/hybrid location is supported with potential Warsaw office access.