Senior Backend Engineer - Payments & Event-Driven Platform

InPost; Warszawa, Kraków; Hybrid; PLN 180,000 - 270,000; Full time

Benefits offered by this job

Hybrid work model

Office in Warsaw or Cracow

Career growth in fintech tech

Job summary

InPost Pay is building its own fintech platform from the ground up, offering a hybrid workplace with 1 day per week in the Warsaw or Cracow office. We seek a Senior Backend Engineer to own payment domain features and build distributed backend services powering financial operations.

You'll work on event-driven services for payment authorisation, ledger management, settlement, and more, collaborating with managers and product teams to shape roadmaps while driving platform improvements.

Qualifications

• At least 5 years of backend software engineering experience using Java, C#/DOTNET, Rust, or Node.js.
• Hands-on experience designing and operating distributed systems and event-driven architectures.
• Delivered and maintained production services, APIs, CI/CD pipelines, and observability solutions.
• Understand distributed systems concepts such as consistency models, saga patterns, idempotency, and outbox patterns.
• Practical experience with relational databases, preferably PostgreSQL.
• Comfortable with automated testing at multiple levels, including unit, integration, and contract tests.
• Actively use AI-powered engineering tools such as GitHub Copilot, ChatGPT, Claude, or similar solutions in everyday development work, based on engineering best practices promoted within the team.
• Communicate in English at B2 level or higher.

Responsibilities

• designing and building event-driven backend services supporting payment authorisation, ledger management, settlement, and other financial domain processes
• developing scalable and resilient APIs with a strong focus on reliability, security, performance, and maintainability
• participating in the full software development lifecycle, from requirements and technical design through testing, release, and production support
• designing and maintaining structured domain events and event-driven integrations across distributed systems
• collaborating with engineering managers and product teams to shape roadmaps, refine requirements, and influence technical direction
• investigating incidents, performing root cause analysis, and driving continuous platform improvements
• mentoring engineers, conducting code reviews, and promoting engineering best practices across the team

Skills

Java

C#/.NET

Rust

Node.js

Event-driven

Distributed systems

English proficiency

Tools

Kafka

PostgreSQL

Docker

Kubernetes

Prometheus

Grafana

OpenTelemetry

Job description

InPost Pay is building its own fintech platform from the ground up, offering a hybrid workplace with 1 day per week in the Warsaw or Cracow office. We seek a Senior Backend Engineer to own payment domain features and build distributed backend services powering financial operations.

You'll work on event-driven services for payment authorisation, ledger management, settlement, and more, collaborating with managers and product teams to shape roadmaps while driving platform improvements.