Linux / Systems Engineer – High-Volume Infrastructure

Description

Job Summary: We are seeking a professional to work on large-scale email delivery systems, optimizing interactions with providers and improving performance. Key Highlights: 1. Direct impact on real-world results through technical optimization. 2. Working on complex problems involving systems, networking, and data. 3. Training in deliverability applied to real-world infrastructures. **Contract Duration:** Indefinite **Job Description:** **Responsibilities:** **Candidate Requirements** ---------------------------- **Education Level:** Higher Vocational Training Cycle **Additional Training:** **Experience:** **Languages and Proficiency:** **Attitudinal Requirements:** **Essential Requirements:** ### **About the Role** If you’re comfortable working in Linux but tired of doing the same things 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 KPIs and system productivity. You’ll work on production systems at scale, where the focus is not just on making them run, but on understanding them, optimizing them, 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 interact with providers such as Gmail, Outlook, or Yahoo — combining systems, networking, and data analysis to continuously improve results. ### **Your Responsibilities** * 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 results * 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 * Previous 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 integrating systems, networking, and data analysis + Direct business impact: every technical improvement translates into real metrics + Training in deliverability applied to real-world infrastructures + Access to a highly sought-after technical domain with few specialists in the market + Integration into a technically experienced team with proven expertise in high-volume systems + An environment that prioritizes analysis and optimization—not just 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: Companies within the adSalsa Group. Purpose: Recruitment and Personnel Selection. Legal Basis: Performance of a contract or implementation of pre-contractual measures. Recipients: No data transfers are made. Rights: Access, rectification, erasure, and data portability; restriction and objection to processing; and the right not to be subject to decisions based solely on automated processing of your data. Additional Information: More information at: adcapital.es/legal/politicas/candidatos