Customer Integration Specialist

OneRail is a technology company innovating solutions for multi-modal delivery. We have built and continue to develop a delivery orchestration platform that connects shippers to an extensive courier ecosystem to automate, optimize, and control the entire delivery supply chain, from the demand signal to the proof of delivery. Our OmniPoint SaaS platform uses proprietary algorithms and artificial intelligence to power efficient same-day delivery programs for major companies like Lowe’s, Pepsi, American Tire Distributors, and Advance Auto Parts.Now we're seeking a dedicated Integration Specialist responsible for designing, configuring, testing, and supporting customer integrations during the implementation lifecycle. This role serves as the technical bridge between customers, Implementation Managers, Product, and Engineering to ensure seamless connectivity between customer systems and the OneRail platform. The ideal candidate is highly technical, customer-focused, and enjoys solving integration challenges while working in a fast-paced SaaS environment.ResponsibilitiesCustomer IntegrationsDesign, configure, and implement customer integrations using APIs, webhooks, SFTP, EDI, and flat-file exchanges.Lead technical discovery sessions to understand customer system architecture and business workflows.Configure integration mappings, authentication methods, and data transformations.Validate end-to-end data flow prior to production launch.Technical DeliveryPartner with Implementation Managers to develop technical implementation plans.Build and execute integration test plans.Troubleshoot API connectivity, data validation, and workflow issues.Document technical configurations and implementation decisions.Create extensive and detailed process and integration flows of customers' existing infrastructure and how it will connect to OneRail.Ensure integrations meet security and performance requirements.Cross-Functional CollaborationServe as the technical liaison between Customer Success, Product, Engineering, and customers.Escalate product defects and enhancement requests with clear technical documentation.Collaborate with Engineering during complex implementations requiring custom development.Assist Support with complex post-go-live integration issues when necessary.Process ImprovementDevelop reusable integration templates and documentation.Improve implementation processes through automation and standardization.Create internal knowledge base articles and customer-facing technical guides.Identify opportunities to reduce implementation timelines through repeatable solutions.QualificationsBachelor's degree in Computer Science, Information Systems, Engineering, or equivalent experience.2–5 years of experience implementing SaaS software or enterprise integrations.Experience working with REST APIs.Familiarity with JSON, XML, CSV, and data transformation.SQL knowledge for data validation.Understanding authentication methods such as OAuth and API Keys.Experience with Postman or similar API testing tools.Familiarity with middleware/iPaaS platforms (MuleSoft, Boomi, etc.).Ability to manage multiple implementation projects simultaneously.Experience with logistics, transportation, supply chain, or retail technology.Understanding webhooks and event-driven architecture.Experience working in a customer-facing SaaS environment.Strong troubleshooting and analytical skills.Advanced proficiency in English & Polish, both written and spoken (B2+). Office location: Kraków, PolandWork Style: Hybrid (3-4 days from the office/week)Salary levels: 13 000 – 16 000 PLN/month