Senior Backend Engineer

trading212; Poland; On-site; PLN 180,000 - 240,000; Full time

Job summary

Trading 212 is seeking Senior Backend Engineers to own end-to-end backend solutions within a microservices architecture. You will design scalable services, ensure data integrity, and work across product and engineering to translate complex requirements into durable solutions.

You will collaborate to diagnose production issues, review code, and raise engineering standards. The role emphasizes ownership, performance, and reliability in a fast-moving platform serving millions of clients.

Qualifications

• Experience owning backend services in a microservices architecture.
• Strong grasp of HTTP, WebSockets and AMQP and when to apply each.
• Production fluency in at least one modern backend framework.
• Deep knowledge of relational databases, indexing, transactions and high-performance design.
• Track record designing systems for high availability and scalability.
• Clear, structured problem-solving and explaining technical decisions.

Responsibilities

• Own backend solutions end to end from problem definition to production.
• Design and evolve services for performance, scale, resilience, data integrity.
• Make clear technical decisions with awareness of constraints and trade-offs.
• Keep code and systems maintainable as requirements evolve.
• Diagnose production problems and address root causes.
• Collaborate with product and engineering teams to turn requirements into solutions.
• Review work, share knowledge, and raise engineering standards.

Skills

Microservices

HTTP/WebSockets/AMQP

System design

Production troubleshooting

Code review

Team collaboration

Tools

Java 21 (Spring)

Go

TypeScript

PostgreSQL

Kafka

Docker

Kubernetes

Redis

Job description

Our mission is to enable everyone to build wealth We reinvent how trading and investing work by creating exceptional products people love. That takes high standards, high velocity and engineers who own what they ship. Today, we serve over 6 million clients, with more than €38 billion in assets under management. At that scale, performance, reliability and data integrity are part of the product.

Our platform is powered by a modern, high-performance engineering stack designed for scale and reliability: Java 21 (Spring), Go, Node.js (TypeScript), PostgreSQL, MariaDB, Redis, Kafka, ClickHouse, Elasticsearch, Docker, Grafana, AWS, Kubernetes and Kibana.

About the role

Senior Backend Engineers work across our backend organisation. Your team match will reflect your strengths, interests and where you can contribute most. Across every team, the model is the same: small, autonomous groups, short release cycles and ownership from problem definition through production.

What you'll do

• Own backend solutions end to end: understand the business problem, shape the requirements, design the solution, build it, test it, deploy it and run it in production.
• Design and evolve services for performance, scale, resilience and data integrity.
• Make clear technical decisions with a full understanding of the constraints, alternatives and trade-offs.
• Keep code and systems maintainable as products and requirements evolve.
• Diagnose difficult production problems, address their underlying causes and prevent recurrence.
• Work closely with product and engineering colleagues to turn complex requirements into simple, durable solutions.
• Review work critically, share knowledge and raise the engineering standard across the team.

What you need to have

• Proven ownership of backend services built and operated within a microservices architecture.
• A strong grasp of communication protocols such as HTTP, WebSockets and AMQP, including when to apply each.
• Production fluency in at least one modern backend framework.
• Deep knowledge of relational databases, including indexing, transactions, isolation levels, locking mechanisms and high-performance design.
• A track record of designing systems for high availability, scalability and resilience.
• Clear, structured problem-solving and the ability to explain technical decisions and trade-offs.
• Strong engineering fundamentals, sound judgement and confidence learning unfamiliar technologies.
• Depth in one backend ecosystem and sound tool choice matter more than familiarity with every technology listed.

What to expect

• Recruiter conversation
• Code Review
• System Design
• Managerial interview
• Your recruiter will explain each stage clearly and follow up after every conversation.

Bring your ambition to Europe's fastest-growing mobile broker!