Staff Backend Engineer: Scale, Reliability & Architecture

Trading 212; Poland; On-site; PLN 300,000 - 550,000; Full time

Job summary

Trading 212 is seeking a Staff Backend Engineer to shape technical direction across services in a high-scale platform used by millions of clients. You will influence architecture, drive critical decisions, and mentor engineers to improve reliability, performance and data integrity.

Work with a modern stack including Java 21 (Spring), Go, Node.js (TypeScript), PostgreSQL, Redis, Kafka, Docker, AWS, Kubernetes and more to solve ambitious backend challenges at scale.

Qualifications

• Evidence of technical impact across multiple teams or a substantial product domain.
• Deep ownership of distributed backend systems operating at meaningful scale.
• Strong judgement in service boundaries, asynchronous communication, data ownership, consistency and failure modes.
• Deep knowledge of relational databases, transactions, concurrency and high‑performance design.

Responsibilities

• Own high-consequence backend problems that span services, teams or product domains.
• Establish clear system boundaries and architectural direction without creating unnecessary central control.
• Lead technical decisions by making constraints, alternatives, risks and trade-offs explicit.
• Improve performance, resilience, data integrity, operability and failure handling across production systems.
• Resolve recurring structural problems rather than treating symptoms team by team.
• Remain hands-on where implementation, diagnosis or prototyping is the fastest way to create clarity.
• Mentor senior engineers, raise review quality and make strong engineering judgement easier to reproduce across teams.
• Partner with engineering and product leaders on sequencing, risk and long-term technical investment.

Skills

Distributed backend systems

System design

Performance optimization

Observability

Relational databases

Technical ownership

Mentoring engineers

Tools

Java 21

Go

Node.js

PostgreSQL

MariaDB

Redis

Kafka

ClickHouse

Elasticsearch

Docker

Grafana

AWS

Kubernetes

Kibana

Job description

Trading 212 is seeking a Staff Backend Engineer to shape technical direction across services in a high-scale platform used by millions of clients. You will influence architecture, drive critical decisions, and mentor engineers to improve reliability, performance and data integrity.

Work with a modern stack including Java 21 (Spring), Go, Node.js (TypeScript), PostgreSQL, Redis, Kafka, Docker, AWS, Kubernetes and more to solve ambitious backend challenges at scale.