System Administrator - AWS & Windows

Summary

Join Leadtech as a Windows & Cloud (AWS) SRE and play a key role in managing and optimizing cloud infrastructure, automating core processes, and ensuring system stability, security, and performance. You will work with AWS, Windows Server environments, and collaborate with other teams. The position requires a strong technical foundation in the Microsoft ecosystem and a drive for continuous improvement. Leadtech offers growth opportunities, flexible work arrangements (including remote options), comprehensive benefits, and a unique office environment in Barcelona. The ideal candidate will have at least 4 years of experience in system administration with a strong focus on Windows environments and proven experience with AWS. Leadtech is an equal opportunity employer.

Requirements

• Experience: Minimum of 4 years of proven experience in system administration or similar roles (SysAdmin, SRE, DevOps), with strong specialization in Windows environments
• Operating Systems: Advanced and proven experience with Windows Server administration (Configuration, AD, GPOs, troubleshooting, hardening, clustering, etc.). This is a core requirement
• Cloud: Demonstrated experience working with AWS and key services (EC2, ECS, S3, VPC, Route 53, Security Groups, Lambda, CloudFront, WAF, API Gateway, OpenSearch, etc.)
• IaC: Experience with Terraform
• CI/CD: Proficient in Jenkins for building and maintaining pipelines
• Scripting: Strong PowerShell skills
• Networking: Solid understanding of TCP/IP, VPCs, Subnetting, Route tables, Security Groups, DNS (Route 53)
• Databases: Experience administering MySQL/MariaDB
• Containers: Experience with Docker and AWS ECS
• Service Administration: Proven experience managing Pentaho – Kettle and N8N
• Security: Experience with SSL/TLS certificates, KMS, etc
• Languages: Fluent Spanish and English (international work environment)

Responsibilities

• Design, implement, and manage AWS infrastructure following best practices for Infrastructure as Code (IaC), security, and high availability (HA)
• Administer and optimize Windows Server operating systems (including Active Directory, GPOs) at an advanced level
• Develop and maintain CI/CD pipelines using Jenkins to automate deployments and testing
• Create and maintain automation scripts (mainly in PowerShell; Bash is a plus)
• Support and manage key platforms and applications, including BI tools like Pentaho and automation platforms like N8N
• Monitor system performance, troubleshoot issues, and perform root cause analysis, mainly in Windows environments
• Collaborate with development teams to set standards, improve processes, and support DevOps practices
• Manage cloud infrastructure security (certificates, KMS, WAF, Security Groups, etc.)
• Administer relational databases like MySQL/MariaDB

Preferred Qualifications

• Experience with Linux administration (preferably CentOS, Ubuntu)
• Experience with Bash scripting
• Familiarity with other orchestration/configuration tools (Ansible, Kubernetes/K8s)
• Knowledge of Python or other programming languages (beyond scripting)
• Experience with other BI tools (Qlik, Knime)
• Experience administering web servers (Nginx, IIS)
• Familiarity with monitoring tools (Grafana, InfluxDB, CloudWatch, System Center)
• Experience with other databases (PostgreSQL, DynamoDB, Redis, ElasticSearch, MS SQL Server)
• Experience with packaging tools (Maven, npm)
• Background in high-traffic web environments
• Ability to work independently and proactively, as well as collaboratively in a team
• Strong problem-solving skills, especially within the Microsoft ecosystem
• Excellent communication skills (both written and verbal)
• Ability to clearly document technical processes
• Continuous improvement mindset, with a focus on automation

Benefits

• Growth and career development
• At Leadtech, we prioritize your growth. Enjoy a flexible career path with personalized internal training and an annual budget for external learning opportunities
• Work-Life balance
• Benefit from a flexible schedule with flextime (7 - 9:30 a.m. start, 3:30 - 6 p.m. end) and the option of working full remote or from our Barcelona office. Enjoy free Friday afternoons with a 7-hour workday, plus a 35-hour workweek in July and August so you can savor summer!
• Comprehensive benefits
• Competitive salary, full-time permanent contract, and top-tier private health insurance (including dental and psychological services)
• 25 days of vacation plus your birthday off, with flexible vacation options—no blackout days!
• Unique Perks
• If you wish to come, in our office in Barcelona you’ll find it complete with free coffee, fresh fruit, snacks, a game room, and a rooftop terrace with stunning Mediterranean views
• Additional benefits include ticket restaurant and nursery vouchers, paid directly from your gross salary