Senior Backend Engineer - Build Scale & Reliability

Trading212; Poland; On-site; PLN 220,000 - 320,000; Full time

Job summary

Trading212 is seeking Senior Backend Engineers to join 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. Proven ownership of backend services within a microservices architecture, strong protocols (HTTP/WebSockets/AMQP), and deep relational database knowledge are essential.

Qualifications

• 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.

Responsibilities

• 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.

Skills

Backend ownership

Microservices

HTTP

WebSockets

AMQP

Backend framework

Relational databases

System design

High availability

Problem solving

Learning new technologies

Job description

Trading212 is seeking Senior Backend Engineers to join 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. Proven ownership of backend services within a microservices architecture, strong protocols (HTTP/WebSockets/AMQP), and deep relational database knowledge are essential.