Senior Backend Engineer - FinTech Engineering (M/F/N)

InPost; Województwo mazowieckie; Hybrid; PLN 240,000 - 360,000; Full time

Job summary

InPost Pay is building its own fintech platform from the ground up. We’re creating a lean, AI-native engineering organization in Poland, with an emphasis on modern distributed systems and autonomy.

We’re looking for a Senior Backend Engineer to own payment domain features, design scalable services, and mentor the team. The role combines architecture, development, and production support in a hybrid setup with weekly office days in Warsaw or Kraków.

Qualifications

• At least 5 years in backend software engineering (Java/C#/NET, Rust, or Node.js).
• Experience designing/operating distributed systems and event-driven architectures.
• Proven production services, APIs, CI/CD, and observability solutions.
• Knowledge of data storage, relational DBs (PostgreSQL preferred).
• English proficiency at B2 level or higher.

Responsibilities

• Design and build event-driven backend services for payment authorisation and ledger management.
• Develop scalable APIs with reliability, security, performance, and maintainability.
• Contribute across the full software lifecycle from design to production support.
• Design and maintain domain events and integrations across distributed systems.
• Collaborate with managers and product teams to shape roadmaps and requirements.
• Mentor engineers, conduct code reviews, and promote best practices.

Skills

5+ years backend

Java

C#.NET

Rust

Node.js

Distributed systems

CI/CD pipelines

Testing (unit/integration/contract)

AI-powered tools

English (B2+)

Tools

PostgreSQL

Kafka

Docker

Kubernetes

OpenTelemetry

Prometheus

Grafana

Job description

InPost Pay is building its own fintech platform from the ground up. It’s a large-scale, international initiative where engineers will have the opportunity to shape the architecture, build core fintech components, and create solutions designed to operate at InPost’s scale.

We’re building a lean, highly effective engineering organization in Poland, with AI-native engineering at its core. We’re looking for strong engineers who are comfortable with agentic engineering, from experienced professionals building complex systems and engineering tooling to a new generation of engineers who have embraced AI-driven development from the start of their careers.

Hybrid working model: preferably 1 day per week in the Warsaw or Cracow office.

Job Description

We're looking for a Senior Backend Engineer to join our FinTech Platform team and help us build the next generation of payment and financial services solutions at InPost.

In this role, you'll take end-to-end ownership of payment domain features, designing and building distributed backend services that power critical financial operations. You'll work in a modern engineering environment where accountability extends from product requirements through architecture, development, production monitoring, and continuous improvement.

What will you work on?

• 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.

Qualifications

This cooperation may be a strong match if you:

• have at least 5 years of experience in backend software engineering using Java, C#/.NET, Rust, or Node.js,
• have hands-on experience designing and operating distributed systems and event-driven architectures,
• have 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,
• have practical experience with relational databases, preferably PostgreSQL,
• are 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.

Additional advantages

• experience within payments, fintech, or regulated environments,
• experience with Java and Spring Boot in production environments,
• knowledge of Kafka or other streaming technologies,
• familiarity with PCI DSS, PSD2, KYC/KYB, or risk decisioning systems,
• experience with Docker, Kubernetes, cloud platforms, and observability tooling such as Prometheus, Grafana, or OpenTelemetry.

Additional Information

What we offer

• the opportunity to build products that sit at the heart of InPost's growing financial services ecosystem,
• ownership of business-critical solutions operating at scale,
• a modern engineering environment focused on autonomy, accountability, and continuous learning,
• collaboration with highly experienced product, engineering, and business teams,
• access to cutting-edge technologies, event-driven architectures, and cloud-native solutions,
• opportunities to shape technical standards, mentor others, and influence platform evolution,
• full-time contract of employment.