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September 8, 2026

Senior Back-end Developer - Microservices Architecture

Senior • Remote

110 - 130 PLN/yr

Warsaw, MZ, Poland

Senior Backend Developer – Microservices & AS4We are looking for a Senior Backend Developer to join a project focused on secure B2B/B2G document and data exchange.You will work with microservices architecture, API-driven development and AS4, a modern standard for secure and reliable business document exchange widely used in European digital ecosystems such as Peppol and eDelivery.Requirements6+ years of experience in software developmentStrong experience with Microservices ArchitectureExperience with API-driven development and system integrationHands-on experience with AS4 or related technologies such as SOAP, Web Services, AS2, eDelivery or PeppolGood understanding of distributed systems and enterprise integrationThe projectA technically challenging, international integration project involving modern microservices, APIs and secure B2B/B2G communication at enterprise scale.

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