Senior Backend Engineer — Card Platform & Partners

Reap; Poland; Remote; PLN 240,000 - 360,000; Full time

Benefits offered by this job

High-ownership role

Strategic partner exposure

AI tools used at work

Professional growth

Healthcare

Team collaboration

Job summary

Reap is seeking a Senior Software Engineer to join the Card Engineering team, building the heart of the card platform, transactions, fraud detection, and developer-facing APIs.

You'll own critical services in a high-ownership, cross-functional setting, collaborating with PMs, design, compliance, and other engineers to deliver scalable, reliable, and compliant financial systems for clients worldwide.

Qualifications

• 6+ years of software engineering experience, ideally in fintech, infrastructure, or platform teams.
• Experience building backend systems in a typed language (e.g., TypeScript, Java, Go).
• Solid grasp of distributed systems concepts: async processing, retries, observability, eventual consistency.
• Strong judgment in balancing correctness, performance, and maintainability.

Responsibilities

• Design and build backend services for card transaction processing, fraud detection, and/or card program management.
• Contribute to system architecture and technical decision-making with a focus on performance, fault tolerance, and maintainability.
• Collaborate with cross-functional stakeholders (Product, Risk, Finance, Compliance) to deliver robust, compliant financial systems.
• Write clean, observable, and well-tested code in a service-oriented architecture.
• Participate in code reviews, incident response, and ongoing reliability improvements.
• Help evolve our engineering practices, tools, and system designs as we scale.

Skills

TypeScript

Java

Go

Distributed systems

Observability

Tools

Node.js

NestJS

AWS

Job description

Reap is seeking a Senior Software Engineer to join the Card Engineering team, building the heart of the card platform, transactions, fraud detection, and developer-facing APIs.

You'll own critical services in a high-ownership, cross-functional setting, collaborating with PMs, design, compliance, and other engineers to deliver scalable, reliable, and compliant financial systems for clients worldwide.