AtKlorie, we're building a next-generation payment platform tailored for European businesses. We're looking for a Senior Back-End Engineer to join our core engineering team. You’ll play a critical role in designing and maintaining the systems that power secure and scalable payment processing across multiple integrations.
As a Senior Engineer, you’ll architect and build robust APIs, maintain infrastructure, and help shape engineering practices that support compliance, resilience, and performance.
Core Responsibilities
Design, implement, and maintain back-end services using Node.js, AWS Lambda, and Docker.
Manage scalable infrastructure on AWS, focusing on cost efficiency and uptime.
Build and optimize relational data models using SQL .
Collaborate closely with front-end engineers, product managers, and compliance teams to ship reliable features.
Implement secure, auditable, and compliant backend flows for payment operations.
Create internal tools and APIs to support operations and integrations.
Own your work end-to-end, from architecture to production monitoring.
Review code, mentor peers, and contribute to system design decisions.
Requirements
5+ years of professional experience in backend engineering, ideally with Node.js .
Deep understanding of AWS services, especially Lambda, S3, API Gateway, and CloudWatch .
Strong SQL skills and experience working with transactional data.
Proficient with Docker and containerized development.
Experience designing and maintaining RESTful APIs.
Familiar with CI/CD pipelines and infrastructure as code (Terraform or AWS CDK is a plus).
Comfortable working in a startup-like, remote-first environment.
Strong communication and collaboration skills.
Nice-to-Haves
Experience in payment systems, fintech, or handling sensitive financial data.
Familiarity with event-driven architectures and message queues (e.g., SNS/SQS, Kafka, etc.).
Knowledge of TypeScript .
Understanding of security and compliance standards (e.g., PCI-DSS).
Monitoring and observability experience (Grafana, Prometheus, or similar).
Familiarity with Clean Architecture or DDD principles.
Why Join Klorie?
Impact: Join early and shape the future of a modern PSP.
Growth: High ownership, high responsibility environment.
Purpose: Help build fair, transparent, and reliable payment infrastructure.
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