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Senior MuleSoft Integration Developer – Managed Services Miejsce pracy: Warszawa Technologies we use Expected Mule ESB Mulesoft Salesforce About the project Join our Managed Services team as a Senior MuleSoft Integration Developer, supporting enterprise-grade integrations and API solutions. You will work closely with Service Delivery Managers, Architects, and clients to maintain, enhance, and optimize MuleSoft-based integration landscapes. This role focuses on ensuring high availability, performance, and scalability of integrations across cloud, hybrid, and on-premises environments while adhering to ITIL processes and managed service standards. Your responsibilities Drive technical support, maintenance, and enhancement of MuleSoft integrations and APIs in collaboration with the Service Delivery Manager, ensuring alignment with business objectives. Support platform upgrades (Mule runtime, Anypoint Platform) including impact analysis, development/configuration, testing, and deployment. Create and maintain technical documentation, runbooks, and operational procedures. Mentor junior developers and promote a culture of learning, quality, and technical excellence. Identify and lead initiatives to improve performance, reliability, cost-efficiency, and developer productivity across the integration landscape. Collaborate with clients, architects, and stakeholders to translate business requirements into scalable API-led MuleSoft solutions; provide estimates and design guidance. Troubleshoot complex incidents, conduct root cause analysis, and implement preventive measures to enhance system stability. Improve observability of integrations through logging, metrics, tracing, dashboards, and alerts. Our requirements Proven experience integrating Salesforce with MuleSoft and understanding Salesforce-MuleSoft integration patterns. MuleSoft certifications: MCD Level 1, Integration Architect, Platform Architect, API Design Associate. Expertise in Mule 4 and Anypoint Platform, with strong DataWeave skills. Deep understanding of API-led connectivity and integration patterns. Experience with REST/SOAP, RAML/OpenAPI, messaging (JMS/Kafka), and connectors/protocols. Strong knowledge of security best practices: OAuth 2.0, JWT, mTLS/TLS, client credential management, and API gateway policies. Hands-on experience with deployment topologies: CloudHub, Runtime Fabric, hybrid/on-prem; familiarity with VPCs, VPNs, Private Spaces, and environment promotion strategies. Proficiency in monitoring and debugging tools, performance tuning, and resiliency patterns. Proven track record in managed services or IT support projects in an international environment. Leadership skills with a collaborative and team-oriented mindset. Optional Experience managing a small project team, including task assignment, progress supervision, and end-to-end solution quality ownership. Willingness to learn and adopt new technologies and integration solutions. This is how we organize our work This is how we work at the clients site SQUARE ONE RESOURCES sp. z o.o. At Square One Poland we link IT experts with the business. With over 25 years of experience, we specialize in recruitment processes on a global scale. Despite years of experience, we still have a startup DNA and this is our advantage. Our offices are located in London and Warsaw, however, we can reach clients from all over the world, from start-ups to big worldwide corporations.