Backend developer in payment processing

We are a lean but growing engineering team working in the eCommerce payment processing space. As we expand, we are looking for a Senior Backend Developer to join our File Processing squad and take ownership of our pipeline migration. You will lead the transition from legacy Perl/crontab infrastructure to a modern, observable, and maintainable Python-based architecture.

• Migrate and re-architect legacy Perl batch jobs and crontab pipelines into modern Python-based services.
• Design and implement orchestration using Prefect or Airflow, including alerting, observability dashboards, and safe job re-run capabilities.
• Instrument services with structured logging and metrics (CloudWatch, or Grafana) to eliminate the need for direct production server access.
• Manage the data layer for file ingestion: landing raw scheme files to S3, parsing/transforming them, and persisting to PostgreSQL or RDS for reconciliation.
• Process and reconcile payment scheme files (clearing, settlement, chargebacks) from card schemes and acquirers.
• Contribute to architecture decisions, write technical documentation, and establish best practices across the team.

• 5+ years of production-grade Python expertise.
• Proven experience in job orchestration using Prefect or Airflow.
• Solid experience with AWS services, specifically S3, Lambda, SQS, and ECS.
• Strong experience with relational databases (MySQL/PostgreSQL) and processing large-scale file-based data.
• We value deep engineering logic over AI-generated snippets. You should be a "clean code" advocate who can explain the reasoning behind every line you ship.
• You care about the "why" behind a feature. You are interested in how a product works for the end-user and the business.
• Strong English communication skills—both written and verbal.
• Будет плюсом: Familiarity with payment scheme file formats (Visa BASE II, Mastercard IPM, or equivalent); Experience reading and refactoring Perl or legacy scripting languages; Knowledge of payment clearing, interchange, and reconciliation processes

• Future-Proof Your Finances: Once you’ve passed probation, we’ll kickstart your Provident Fund to secure your future.
• Grow with Us: Annual Learning Budget for professional development (eligible after probation)—because your growth is our growth.
• Wolt Your Way Through Lunch: €150 monthly Wolt allowance to keep you fueled and happy.
• Stay Active Your Way: Enjoy a SportsBenefits membership giving you access to a wide variety of gyms and sports facilities to support your active lifestyle.
• Drive in Style: After one year with us, you may be eligible for a company car—performance and availability permitting.
• Park with Ease: Complimentary parking space just steps from the office, so your commute is as smooth as your workday.
• Max Out Your Downtime: 25 days of vacation + public holidays + 10 days of sick leave.
• Shop & Save: Exclusive local discount card + tickets for exciting events like Beonix, basketball games, and more.
• Speak Like a Local: Join free Greek language classes, twice a week, open to all team members.
• Celebrate Together: We bring colleagues from all offices together for unforgettable company celebrations.
• Global Collaboration & Events: Opportunities to participate in international company events and initiatives, connecting with colleagues from all regions and contributing to a truly global community
• We offer a relocation package that will be discussed in the first interview with your Talent Acquisition Partner.