System Administrator - AWS & Windows (SRE/BI)

At Leadtech, we’ve been redefining digital businesses since 2009, creating innovative online solutions that reach millions of users every month. With a diverse team of over 700 members from 23+ nationalities, we’re united by a passion for creativity and collaboration.

We specialize in delivering user-centric experiences across web and mobile platforms, where people can connect with our products like never before.

We’re proud of our global reach and committed to fostering an inclusive workplace where every individual contributes to our shared vision of bringing cutting-edge projects to life. Learn more about our journey and mission on our About Us page!

As a Windows & Cloud (AWS) SRE, you’ll play a key role in managing and optimizing our cloud infrastructure (mainly AWS), automating core processes, and ensuring the stability, security, and performance of our systems—with a strong focus on Windows Server environments. You’ll work closely with fellow team members and other departments (such as Development and BI), making a significant impact on our products and internal processes. We're looking for someone proactive, with a strong technical foundation in the Microsoft ecosystem and a drive for continuous improvement.

Key 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.
• Linux administration experience (CentOS/Ubuntu) is a plus.

Requirements

Required Qualifications:

• 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).

Nice-to-Have Skills (Bonus Points!):

• 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.

Desired Personal Competencies:

• 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

WHY SHOULD YOU JOIN US?

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.

Join us in an environment where you’re free to innovate, learn, and grow alongside passionate professionals. At Leadtech, you’ll tackle exciting challenges and be part of a vibrant team dedicated to delivering exceptional user experiences

Sounds good? Apply now! We’re looking forward to getting to know you.

Equal Employment Opportunity Employer:

Leadtech is an Equal Employment Opportunity (EEO) Employer, which means we encourage applications from people with different backgrounds, interests, and personal circumstances. Our team welcomes applicants regardless of their race, gender, age, religion, nationality, sexual orientation, gender identity, gender expressión and/or disabilities. All we need is your high energy, skills, and willingness to be a part of a great project!

Location

You'll have the flexibility to choose whether you'd like to come to the office every day, from time to time, or work fully remote. We want you to find the best combination for you.

If you prefer to be surrounded with amazing people, our exceptional office is in Barcelona’s Blue Building, located right on the city's seafront. Besides our stunning views, you’ll enjoy our office perks such as free fruit, snacks, and coffee and you’ll also be able to take part in our Mario Kart and table tennis competitions.

The personal data you provide will be processed in order to manage your candidacy for the corporate selection processes that fit your profile. If you wish, you can exercise your rights of access, rectification or cancellation by writing to our address (Avenida Litoral, 12-14, 5ta planta. Barcelona. 08005) or to the email address [email protected], attaching to your request a document that can validate your identity.