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Castillians

Remote Jobs

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73 open rolesTeam 51,200Since 2006H1B No SponsorLatest: Jul 9, 2026, 2:48 PM UTCCompany SiteLinkedIn
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73 Jobs

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Senior Virtualization Engineering

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ContractRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Design, implement, and maintain virtualized environments using platforms such as VMware vSphere, Hyper-V, or KVM. • Manage server consolidation, clustering, and resource optimization to ensure performance and scalability. • Integrate virtualization platforms with storage, networking, and backup solutions. • Monitor system health, capacity, and performance, proactively identifying and resolving issues. • Support disaster recovery and business continuity initiatives within virtual environments. • Implement and maintain security best practices for virtual machines, hypervisors, and management consoles. • Collaborate with infrastructure and security teams to streamline automation and improve deployment efficiency. • Provide technical support to customers and reseller partners on virtualization design and troubleshooting.

Ireland
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Senior AWS Cloud Engineer

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Cloud Engineer3 days ago
ContractRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Design, deploy, and manage AWS infrastructure using Infrastructure as Code (IaC) tools such as Terraform or AWS CloudFormation. • Build and maintain robust CI/CD pipelines using Jenkins, GitLab CI, GitHub Actions, or AWS CodeSuite to streamline application delivery. • Manage containerized applications using Amazon EKS (Kubernetes) or ECS (Fargate/EC2) in production environments. • Implement comprehensive monitoring, logging, and alerting strategies using CloudWatch, Prometheus, Grafana, or the ELK Stack to ensure system reliability and performance. • Enforce cloud security best practices including IAM least privilege, VPC security groups, encryption (KMS), and assist in compliance audits (SOC2, ISO). • Optimize AWS services (EC2, RDS, Lambda, S3) for high availability, scalability, and cost efficiency through right-sizing and purchasing strategies.

Ireland
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Network Engineer

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ContractRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Design, implement, and maintain Cisco-based network infrastructure. • Configure and support Cisco routers, switches, wireless solutions, and security devices. • Monitor network performance and ensure high availability of services. • Troubleshoot network connectivity, routing, switching, wireless, and security issues. • Manage VLANs, VPNs, QoS, STP, OSPF, EIGRP, BGP, and network segmentation. • Support Cisco Meraki, Catalyst, Nexus, and other Cisco technologies as applicable. • Conduct health checks and performance assessments of network environments. • Implement network security best practices and compliance requirements. • Collaborate with client stakeholders and third-party vendors. • Prepare technical documentation, network diagrams, and operational procedures. • Provide recommendations for network improvements and modernization. • Support migration, deployment, and infrastructure upgrade projects.

Ireland
ContractRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Providing technical guidance and expertise to the team. • Supporting architectural and technology-related decision-making throughout the project lifecycle. • Mentoring team members on a regular basis to promote professional growth and knowledge sharing. • Fostering a culture of empowerment, innovation, and effective problem-solving within the team. • Participating actively in code reviews to ensure high standards of code quality and maintainability. • Taking part in Agile ceremonies and contributing to continuous team improvement. • Identifying, assessing, and helping resolve technical risks, issues, and project impediments. • Delivering constructive technical feedback and conducting reviews to support team success. • Resolving technology-related challenges that may hinder development progress.

Worldwide
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Data Scientist

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Data Scientist3 days ago
ContractRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Design, develop, and deploy machine learning and data science solutions using Python. • Build and maintain reusable Python libraries and analytical frameworks. • Develop machine learning models, data visualization solutions, and analytical dashboards. • Build and deploy APIs and cloud-based applications. • Implement and maintain CI/CD pipelines for machine learning workflows. • Deploy, monitor, and optimize machine learning models on Microsoft Azure. • Collaborate with business stakeholders to translate business requirements into technical solutions. • Maintain technical documentation and follow software engineering best practices. • Stay up to date with emerging technologies and industry trends relevant to the role.

Ireland
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IT Administrator

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IT Support5 days ago
ContractRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Provide to users support and assistance on Windows and MacOS where required • Maintain, support and administer Internal IT infrastructure • Work in a Global IT Service Desk function, logging all incidents and requests, their acknowledgements and their resolutions • Ensuring that all support tickets are handled effectively • Work closely with other departments to maintain systems uptime • Proactively monitor and audit the health and availability of systems • Update the internal knowledgebase with technical documentation and manuals • Provide user management for different systems according to predefined profiles • Support roll-out of new applications and services • Test and evaluate new technologies (both hardware and software) • Work with Security teams to support with IT Systems and User audits

Ireland
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Senior Citrix Netscaler Engineer

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ContractRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Configure and manage Citrix NetScaler Gateway for secure remote access, SSL offloading, and traffic management. • Implement Global Server Load Balancing (GSLB) and high availability (HA) solutions across multiple data centers. • Deploy and maintain Secure Private Access hybrid environments, ensuring integration with Citrix Workspace and StoreFront. • Configure SSL/TLS certificates for NetScaler Gateway, ensuring compliance with enterprise FQDN and certificate policies. • Implement Application Firewall (AppFW) and traffic policies to protect against web application threats. • Manage authentication profiles and integrate with OIDC/SAML IdPs for secure identity management. • Monitor ADC performance, troubleshoot latency issues, and optimize traffic flows. • Maintain system requirements: NetScaler versions 13.1/14.1 or later, Windows Server 2019+, SQL Server 2019/2022 for logging and monitoring. • Ensure communication ports and callback URLs are correctly configured for Secure Private Access. • Work closely with network, security, and application teams to align ADC solutions with business needs. • Document configurations, policies, and provide training to operations staff.

Ireland
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AI Engineer

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AI Engineer15 days ago
Full TimeRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Develop documentation processes and guidelines for AI policy • Work on AI initiatives involving chatbots and document control • Design and maintain AI chatbot functionalities • Collaborate with stakeholders for requirement finalization • Automate internal operational pipelines

Ireland
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Senior QA Engineer

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QA Engineer15 days ago
Full TimeRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Perform manual and automated testing for server and client migration • Design, develop, and maintain automated testing scripts and frameworks • Identify and prioritize test cases for automation • Collaborate with teams to review test cases and align activities

Ireland
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DevOps Engineer

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DevOps Engineer15 days ago
Full TimeRemoteSeniorTeam 51-200Since 2006H1B No Sponsor

• Create a tailored portal for clients • Block traffic from specific regions • Implement and manage security measures • Conduct security assessments and audits • Train team on security best practices

Ireland

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