Linux / Systems Engineer – High-Volume Infrastructure

Description

Job Summary: We are seeking a professional to work on large-scale email delivery infrastructure, optimizing production systems with direct impact on business outcomes. Key Highlights: 1. Direct business impact: every technical improvement is reflected in real metrics. 2. Deliverability training applied to real-world infrastructures. 3. Join a technical team with experience in high-volume systems. **Contract Duration:** Indefinite **Job Description:** **Responsibilities:** **Candidate Requirements** ---------------------------- **Education Level:** Higher Vocational Training Cycle **Additional Education:** **Experience:** **Languages and Proficiency:** **Attitudinal Requirements:** **Essential Requirements:** ### **About the Role** If you feel comfortable working in Linux but are tired of doing the same thing over and over — maintaining systems, applying changes, and little else — here you’ll work on something different. In our case, every technical decision has a direct impact on real outcomes: if you do it better, you improve key performance indicators (KPIs) and system productivity. You will work on production systems at scale, where the focus is not just on keeping them running, but on understanding, optimizing, and pushing them further. ### **What We Do** At Doctorsender, we operate large-scale email delivery infrastructure, handling millions of messages daily for performance- and affiliate-oriented clients. Our work involves optimizing how these systems behave with providers such as Gmail, Outlook, or Yahoo — combining systems, networking, and data analysis to continuously improve results. ### **What You’ll Do** * Work on high-volume email delivery infrastructure (MTAs, routing, traffic control) * Analyze large volumes of logs to detect patterns and issues * Understand and optimize how our systems interact with ISPs * Design technical improvements with direct impact on performance and outcomes * Translate technical decisions into real metrics ### **Work Modality** ### **This is an on-site position because the work is highly collaborative and technical. Much of the analysis, learning, and decision-making happens in teams, directly on production systems, where face-to-face interaction delivers significantly more value than remote work.** ### **Requirements** * Experience working with Linux systems and regular use of the command line * Ability to analyze logs and understand what is happening within a system * Scripting knowledge (Bash, Python, or similar) * Basic experience with databases (MySQL or similar) * Ability to leverage AI tools to automate tasks, analyze information, and improve technical productivity * Analytical mindset and problem-solving orientation ### **Preferred Qualifications** * Experience in high-volume environments or distributed systems * Knowledge of networking or protocols (SMTP, TCP/IP, etc.) * Prior experience with email or deliverability * Backend development experience (PHP, Symfony, or others) * Regular use of AI tools for scripting, analysis, or automation * Interest in metrics, performance, and optimization ### **What We Offer** * + Work on complex problems that combine systems, networking, and data analysis + Direct business impact: every technical improvement is reflected in real metrics + Deliverability training applied to real-world infrastructures + Access to a high-demand technical field with few specialists in the market + Join a technical team with proven experience in high-volume systems + An environment where analysis and optimization are prioritized over mere maintenance **Preferred but Not Required Qualifications:** **Residence Area:** Alcoi or surrounding areas **Other Relevant Information** -------------------------- **Attitudes:** **Compensation Level:** **Other Information:** ### **Basic Data Protection Information** Data Controller: ADCAPITAL NETWORKS, S.L. Joint Controllers: adSalsa Group companies. Purpose: Recruitment and personnel selection. Legal Basis: Performance of a contract or implementation of pre-contractual measures. Recipients: No data transfers occur. Rights: Right to access, rectify, erase, and port your data; right to restrict or object to processing; and right not to be subject to decisions based solely on automated processing of your data. Additional Information: More details at: adcapital.es/legal/politicas/candidatos