Senior Backend Engineer – FinTech/Payments (Hybrid)

Traffit; Kraków; Hybrid; PLN 240,000 - 340,000; Full time

Benefits offered by this job

Hybrid work model

Private medical care

Sports card

Training courses

Job summary

People More is seeking a Senior Backend Engineer – FinTech / Payments to design and maintain distributed backend services for payment authorisation, ledgers, and settlements. You will build scalable APIs, focus on performance and resilience, and work across the full SDLC with product teams.

The role requires 5+ years of backend experience with Java, C#.NET, Rust, or Node.js, plus strong knowledge of distributed systems and testing. Hybrid work and international projects are offered.

Qualifications

• 5+ years of commercial backend development experience.
• Hands-on with distributed systems and event-driven architectures.
• Strong knowledge of distributed systems: consistency, Saga, idempotency, Outbox.
• Experience building production-grade backend services and APIs.
• Familiar with CI/CD pipelines, production monitoring and observability.
• Relational DB knowledge, preferably PostgreSQL.
• Experience with automated testing: unit/integration/contract tests.
• Proficiency with AI-assisted development tools in daily work.
• Ability to write clean, well-tested code.
• Very good English and Polish.

Responsibilities

• Design, develop, and maintain distributed backend services for payments and ledgers.
• Build scalable, secure APIs with performance and resilience in mind.
• Develop event-driven architectures and inter-service integrations.
• Own backend solutions through design, implementation, testing, and production support.
• Design domain events and ensure reliable data exchange between systems.
• Collaborate with engineering and product teams on requirements and architecture.
• Monitor production, investigate incidents, perform root cause analysis, implement improvements.
• Review code, mentor developers, and contribute to engineering standards.

Skills

Java

C#.NET

Rust

Node.js

Distributed systems

CI/CD

PostgreSQL

Testing

English

Polish

Job description

People More is seeking a Senior Backend Engineer – FinTech / Payments to design and maintain distributed backend services for payment authorisation, ledgers, and settlements. You will build scalable APIs, focus on performance and resilience, and work across the full SDLC with product teams.

The role requires 5+ years of backend experience with Java, C#.NET, Rust, or Node.js, plus strong knowledge of distributed systems and testing. Hybrid work and international projects are offered.