Senior Backend Engineer, Python – Core Gateway

payabl.

Senior Backend Developer for Core Gateway team in a remote role from Poland. Responsible for extending Perl-based payment gateway while building Python microservices platform.

Posted 6/22/2026full-timeRemote • 🇵🇱 PolandSeniorWebsite

Tech Stack

Tools & technologies

AWSCloudDockerKafkaPerlPython

About the role

Key responsibilities & impact

Support and extend the existing Perl-based payment gateway debugging production issues and adding features while migration is ongoing
Design, develop, and maintain modern server-side components in Python, ensuring high performance and scalability
Integrate third-party APIs and external payment services into both legacy and modern platform layers
Collaborate with multiple stakeholders across departments working in agile sprints
Maintain high code quality standards and contribute to a culture of continuous improvement
Work closely with DevOps on CI/CD pipelines, containerization, and cloud deployments

Requirements

What you’ll need

5+ years of backend engineering experience with strong Python mastery (AsyncIO and FastAPI preferred)
Experience with Perl (or eagerness to learn and work within Perl production code)
Solid experience integrating third-party APIs and understanding of webhooks, callbacks, and retry policies
Experience with CI/CD pipelines (GitLab preferred), Docker containerization, and familiarity with AWS (Lambda, cloud services)
Exposure to event-driven architectures (Kafka, message queues, etc.)
Advocate for clean code and able to explain the reasoning behind every line shipped
Interested in how a product works for the end-user and the business
Strong English communication skills—both written and verbal

Benefits

Comp & perks

Annual Learning Budget for professional development (eligible after probation)
Company celebrations
Opportunities to participate in international company events and initiatives

ATS Keywords

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Hard Skills & Tools

PythonPerlAsyncIOFastAPIAPI integrationCI/CDDockerAWSKafkaevent-driven architecture

Soft Skills

collaborationcommunicationclean code advocacycontinuous improvementstakeholder engagementproblem-solvingagile methodologyattention to detailuser-centric thinkingexplanation of technical concepts