Senior Backend Python Engineer (Core Gateway)

payabl.; Warszawa; On-site; PLN 257,842 - 343,790; Full time

Benefits offered by this job

Provident Fund after probation

Annual Learning Budget for professional development

€150 monthly Wolt allowance

SportsBenefits membership

Company car after one year

Complimentary parking near the office

25 days of vacation plus public holidays and 10 days of sick leave

Local discounts and event tickets

Free Greek language classes

Company celebrations across offices

Opportunities for international company events

Job summary

payabl. is expanding its engineering team and is seeking a Senior Backend Developer for the Core Gateway team. In this critical role, you will maintain and modernize a Perl-based payment gateway and lead the development of a next-generation Python microservices platform.

The ideal candidate should possess 5+ years of backend engineering experience, with a strong mastery of Python as well as flexibility in legacy systems. You'll collaborate within agile teams while ensuring high performance and scalability.

Qualifications

• 5+ years of backend engineering experience with strong Python mastery.
• Experience with Perl or eagerness to learn legacy Perl code.
• Solid experience integrating third-party APIs and understanding of webhooks.

Responsibilities

• Support and extend the existing Perl-based payment gateway.
• Design, develop, and maintain server-side components in Python.
• Integrate third-party APIs into legacy and modern platforms.

Skills

Python Expertise

Perl Flexibility

API Integration

CI/CD Pipelines

Event-Driven Architecture

Clean Code Advocacy

Curiosity for Product

English Proficiency

Tools

Docker

AWS

Job description

Overview

We are expanding our engineering capabilities and looking for a Senior Backend Developer to join our Core Gateway team. This is a unique, dual-track role where you will play a central part in both the present and future of our infrastructure. You will support, maintain, and extend our existing Perl-based payment gateway ensuring stability and high performance in a live financial production environment while simultaneously leading the architecting and building of our next-generation Python microservices platform. In this role, you will work in a fast-paced environment where system performance, scalability, and 99.9% reliability are critical to our core transaction flow.

Responsibilities

• Dual-Track Maintenance: Support and extend the existing Perl-based payment gateway debugging production issues and adding features while the migration is ongoing
• Modernization: Design, develop, and maintain modern server-side components in Python, ensuring high performance and scalability
• Integrations: Integrate third-party APIs and external payment services into both legacy and modern platform layers
• Agile Collaboration: Maintain clean and strong English communication to effectively collaborate with multiple stakeholders across departments working in agile sprints
• Product Thinking: Go beyond the "what" and "how" of the code bring a product-focused mindset to understand the business logic and user impact of what you build
• Engineering Standards: Participate in code reviews, uphold high code quality standards, and contribute to a culture of continuous improvement
• Infrastructure: Work closely with DevOps on CI/CD pipelines, containerization, and cloud deployments

Requirements

• Python Expertise: 5+ years of backend engineering experience with strong Python mastery (AsyncIO and FastAPI preferred)
• Legacy Flexibility: Experience with Perl (or a genuine eagerness to learn and work within Perl production code). We value polyglot engineers who can read and refactor legacy code
• API Mastery: Solid experience integrating third-party APIs and a deep understanding of webhooks, callbacks, and retry policies
• Tech Stack: Experience with CI/CD pipelines (GitLab preferred), Docker containerization, and familiarity with AWS (Lambda, cloud services)
• Architecture: Exposure to event-driven architectures (Kafka, message queues, etc.)
• Clean & Intentional Code: 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
• Curiosity for Product: You care about the "why" behind a feature. You are interested in how a product works for the end-user and the business
• English Proficiency: Strong English communication skills—both written and verbal—to collaborate across multi-functional teams

Benefits

• Future-Proof Your Finances: Provident Fund after probation
• Grow with Us: Annual Learning Budget for professional development (eligible after probation)
• Wolt Your Way Through Lunch: €150 monthly Wolt allowance
• Stay Active Your Way: SportsBenefits membership
• Drive in Style: Company car after one year (availability and performance permitting)
• Park with Ease: Complimentary parking near the office
• Max Out Your Downtime: 25 days of vacation plus public holidays and 10 days of sick leave
• Shop & Save: Local discounts and event tickets
• Speak Like a Local: Free Greek language classes, twice a week
• Celebrate Together: Company celebrations across offices
• Global Collaboration & Events: Opportunities to participate in international company events

The benefits listed above are for our Cyprus office location only, a list of benefits and contract type will be assessed subject to your location and discussed in the first interview with your Talent Acquisition Partner.

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