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

InPost Group; Polska; Hybrid; PLN 210,000 - 280,000; Full time

Job summary

InPost Pay is building its own fintech platform from the ground up, offering engineers the chance to shape architecture and create scalable payment solutions at scale.

We’re building a lean, AI-native engineering team in Poland with hybrid work (1 day/week in Warsaw or Cracow). Senior Backend Engineer duties include end-to-end ownership of payment domain features and distributed backend services.

Qualifications

• 5+ years in backend engineering (Java/C#/Rust/Node.js).
• Design/operate distributed event-driven systems.
• Production services, APIs, CI/CD, observability.
• Know sagas, idempotency, outbox concepts.
• Relational DB skills, PostgreSQL preferred.
• Automated testing: unit/integration/contract.
• Use AI tooling (Copilot/ChatGPT) in daily dev.
• English B2+.

Responsibilities

• Design and build event-driven backends for payments.
• Develop scalable, secure APIs for financial ops.
• Participate in full SDLC from design to production support.
• Design domain events and cross-system integrations.
• Collaborate to shape roadmaps and tech direction.
• Investigate incidents and drive platform improvements.
• Mentor engineers and promote best practices.

Skills

Backend engineering

Distributed systems

CI/CD pipelines

Observability

English (B2+)

Tools

Docker

Kubernetes

PostgreSQL

OpenTelemetry

Kafka

Prometheus

Job description

• Full-time

Company 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.

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