Senior Engineering Development Expert

Job Description About the Team The .NET Application Integration Services (AIS) squad provides critical engineering capabilities supporting integration, security, middleware, cloud platforms, and application modernization across Euroclear. The Team Delivers And Supports Security token servicesAuthentication and authorization platformsEnterprise integration componentsCloud-native and hybrid hosting platformsReusable .NET engineering frameworksApplication modernization initiativesTechnical platform services used by hundreds of developers As the Krakow engineering hub continues to grow, we are looking for a senior expert capable of combining deep technical expertise with coaching and leadership responsibilities. Role Overview We are seeking a highly experienced Senior Engineering Development Expert to drive complex technical integration initiatives and strengthen the squad's expertise in application security, authentication, identity management, and cloud-native engineering. The role includes supporting and managing existing Microsoft Service Fabric on-premises environments that host business-critical applications. It also involves contributing to the evolution of these applications towards modern cloud and container hosting solutions, including Azure AKS, Azure App Service, and OpenShift. The successful candidate will act as a senior technical authority, helping development teams design, implement, troubleshoot, and secure business-critical solutions while coaching and mentoring engineers across the organization. This role requires strong hands-on expertise and the ability to engage effectively with developers, architects, security specialists, analysts, and operations teams. Key Responsibilities Service Fabric and On-Premises Platform Engineering Operate, administer, and support Microsoft Service Fabric clusters hosted in an on-premises environment.Support Service Fabric cluster lifecycle activities, including installation, configuration, upgrades, patching, monitoring, capacity management, resiliency, and operational maintenance.Support the deployment and lifecycle management of applications hosted on Service Fabric.Investigate and resolve complex Service Fabric platform and application incidents.Analyse cluster health, application health, performance, availability, and resource consumption.Support Service Fabric security, certificate management, access controls, and communication between cluster components.Develop and maintain PowerShell-based automation for Service Fabric administration and operational activities.Provide technical guidance to application teams on Service Fabric deployment, diagnostics, reliability, and operational best practices.Act as a senior escalation point for issues affecting Service Fabric clusters and the applications hosted on them. Advanced Security & Identity Integration Design and support enterprise authentication and authorization solutions.Implement and troubleshoot OAuth 2.0, OpenID Connect, SAML, WS-Federation, and related protocols.Support security token services used by business-critical applications.Lead complex token migration and identity integration initiatives.Integrate applications with corporate identity providers and external identity systems.Support PKI, certificates, cryptographic keys, and trust chains. Technical Integration Design and implement complex application-to-application integrations.Support API security patterns and secure service-to-service communication.Guide teams on enterprise integration best practices.Support hybrid environments spanning on-premises and cloud platforms.Drive modernization of legacy integration components. Cloud & Platform Engineering Design and operate secure cloud infrastructures.Support Azure-based services and containerized workloads.Contribute to platform engineering initiatives.Implement infrastructure-as-code and automation practices.Define operational excellence and resiliency standards. Technical Leadership Coach junior and mid-level engineers.Participate in architecture and engineering reviews.Influence technical strategy and engineering standards.Contribute to Communities of Practice and knowledge-sharing initiatives.Act as an escalation point for complex incidents and investigations. Mandatory Skills Security & Identity OAuth 2.0OpenID ConnectSAMLMicrosoft Entra ID / Azure ADADFSKerberosActive DirectorygMSA accountsPKI and certificate managementSecurity token services Software Engineering C#.NET Framework.NET 8+ASP.NET CoreWeb APIsDistributed architecturesSecure application designStrong hands-on experience with Microsoft Service Fabric.Service Fabric cluster administration in an on-premises environment.Service Fabric cluster installation, configuration, operation, maintenance, and upgrades.Service Fabric application deployment and lifecycle management.Service Fabric monitoring, diagnostics, health management, and troubleshooting.Service Fabric security and certificate management.Understanding of Service Fabric reliability, availability, partitioning, replication, and failover concepts.Experience supporting business-critical applications hosted on Service Fabric.PowerShell automation for Service Fabric administration and operational activities. Microsoft Service Fabric Cloud & DevOps AzureAzure DevOpsGitCI/CDInfrastructure AutomationPowerShellMonitoring and Observability Integration API integrationService-to-service authenticationEnterprise middlewareMessaging and event-driven patterns Nice to Have Kubernetes / OpenShiftService Mesh technologiesDaprIdentityServer / DuendeLinux administrationJava integration experienceSplunkZero Trust security conceptsCloud security architectures Experience 8+ years of software engineering experience.5+ years in security, identity, application integration, or platform engineering.Proven experience mentoring engineers and providing technical leadership.Experience operating in large-scale regulated environments. Why Join Us Work on business-critical security and integration platforms.Influence strategic technology decisions.Engage with architects, security experts, and senior engineering leaders.Help shape the future cloud and identity landscape.Mentor the next generation of engineers in a growing Krakow hub. Please note that this is a permanent position, and we do not offer freelance/contract arrangement for the role. About Us Why join us Embark on your new adventure at Euroclear, and work at the heart of the global capital markets. We connect over 2,000 financial institutions across the globe. As an open and resilient infrastructure, we contribute to the stability of the financial markets. We help clients cut through complexity, lower costs, and mitigate risks of financial transactions. At Euroclear, we have the clear ambition to use our key role to facilitate and accelerate a sustainable global financial system. What We Offer Work closely with inspiring, supportive and engaged colleagues from more than 80 different countries. Practice your talents in a highly professional international environment. Join a learning and development environment with an emphasis on knowledge sharing and training.Competitive salary and comprehensive benefits. Ways of working Find your own optimal balance within our hybrid working model, where you can connect at the office 8 days a month and also benefit from remote working. Great Place to Work for All We are committed to creating an inclusive culture that celebrates diversity and strives to be a Great Place to Work for All. All qualified applicants will be considered for employment, regardless of any aspect that makes them unique (including race, religion, national origin, gender, sexual orientation, age, marital status, pregnancy, disability, ...). If you need any specific accommodation due to disability or any other reason, you can let the recruiter know during your application process. Our values guide how we work together and shape our future: Our mission and values - Euroclear