Mechanical Design Manager

📍 Job Overview

Job Title: Mechanical Design Manager

Company: DayOne

Location: Madrid, Spain (with potential for London)

Job Type: Full-time

Category: Engineering / Operations Management

Date Posted: 2026-09-02

Experience Level: 10+ Years

Remote Status: On-site

🚀 Role Summary

• Lead the end-to-end mechanical design for mission-critical data center projects across Europe, focusing on HVAC, plumbing, and drainage systems.

• Ensure mechanical infrastructure design meets stringent reliability, scalability, maintainability, and energy efficiency standards.

• Drive multidisciplinary coordination with internal teams, consultants, contractors, vendors, and regulatory authorities to deliver integrated and compliant design solutions.

• Provide expert technical leadership and quality assurance throughout the design lifecycle, from concept to handover.

• Uphold DayOne's commitment to sustainability and industry best practices in all mechanical system designs.

📝 Enhancement Note: This role is critical for DayOne's European expansion, requiring a seasoned Mechanical Design Manager to ensure the robust and efficient mechanical infrastructure of their new data centers. The emphasis on "mission-critical" and "hyperscale" environments signifies a need for a deep understanding of high-availability design principles and large-scale system operations.

📈 Primary Responsibilities

• Mechanical Design Oversight: Spearhead the development and execution of mechanical designs for data center projects, encompassing HVAC, plumbing, drainage, and related building services.

• Cooling and Thermal Performance Management: Dictate cooling architecture strategies, including heat rejection methods, chilled water systems, sophisticated airflow management, and ensuring appropriate redundancy levels for optimal energy efficiency and maintainability.

• Multidisciplinary Coordination and Integration: Facilitate seamless collaboration and integration of mechanical systems with electrical, architectural, civil, structural, fire protection, ELV, and controls engineering disciplines, as well as with operations, consultants, contractors, and vendors.

• Technical Leadership and Guidance: Offer expert technical direction to internal teams and external partners, ensuring all mechanical solutions are robust, scalable, energy-efficient, easily maintainable, and fully aligned with project objectives and operational requirements.

• Design Review and Quality Assurance: Conduct thorough reviews of all mechanical design documentation, including drawings, specifications, engineering calculations, equipment schedules, and technical proposals, to ensure completeness, accuracy, optimal coordination, constructability, and long-term maintainability.

• Standards, Regulations, and Compliance: Guarantee that all mechanical designs rigorously adhere to DayOne's internal standards, relevant European and local building codes, authority requirements, sustainability mandates, and specific end-user expectations.

• Vendor and Supplier Management: Evaluate and select mechanical equipment, systems, and technologies, assessing their suitability against project needs, reliability targets, energy performance metrics, maintainability, and total lifecycle cost.

• Risk Mitigation and Issue Resolution: Proactively identify potential design and construction risks, resolve complex technical issues, and provide informed support for critical decisions throughout the design, installation, commissioning, handover, and operational readiness phases.

📝 Enhancement Note: The responsibilities highlight a hands-on leadership role that requires not only technical design expertise but also strong project management and stakeholder engagement skills. The emphasis on "oversight," "coordination," and "risk resolution" suggests a need for a candidate who can manage multiple complex workstreams simultaneously and drive consensus among diverse groups.

🎓 Skills & Qualifications

Education:

• Bachelor’s degree in Mechanical Engineering, Building Services Engineering, HVAC Engineering, or a closely related technical discipline.

• A Master’s degree in a relevant engineering field is considered a significant advantage. Experience:

• A minimum of 8–10 years of progressive experience in mechanical, HVAC, cooling, hydronic, or building services design.

• Prior experience within hyperscale, colocation, cloud infrastructure, or other mission-critical data center environments is highly preferred. Required Skills:

• Data Center Mechanical Systems Expertise: In-depth knowledge of data center mechanical systems, including advanced HVAC design, cooling infrastructure, chilled water loops, hydronic networks, efficient heat rejection strategies, sophisticated airflow management, ventilation principles, and plumbing/drainage systems.

• Thermal Performance Analysis: Strong understanding of thermal dynamics and performance metrics (e.g., PUE) within data center environments.

• Design and Documentation Proficiency: Proven ability in mechanical equipment selection, specification writing, engineering calculations, conducting comprehensive design reviews, developing detailed technical documentation, and coordinating complex, multidisciplinary design workstreams.

• Standards and Regulatory Knowledge: Familiarity with key mechanical and HVAC industry standards, building services best practices, sustainability initiatives, energy efficiency standards (e.g., LEED, BREEAM principles), data center reliability and redundancy criteria, and relevant European/local regulations and authority requirements.

• Multidisciplinary Coordination: Demonstrated ability to effectively coordinate mechanical design interfaces with electrical, architectural, civil, structural, fire protection, ELV, and controls engineering teams, as well as project managers, contractors, and vendors.

• Leadership and Organizational Skills: Strong leadership capabilities with excellent organizational skills to manage multiple projects and stakeholders effectively.

• Communication Skills: Excellent verbal and written English communication skills are essential for clear and concise technical dialogue and reporting.

• Analytical and Problem-Solving: Robust analytical capabilities and a proactive approach to problem-solving, with a proven track record of identifying and resolving technical issues in design and construction.

Preferred Skills:

• Professional Certifications: Holding a Professional Engineer (PE), Chartered Engineer (CEng), or equivalent professional certification in mechanical engineering or building services.

• Second European Language Proficiency: Fluency in a second European language is advantageous for enhanced communication across DayOne's European operations.

• Experience with Design Software: Familiarity with industry-standard CAD and BIM software (e.g., AutoCAD, Revit MEP).

📝 Enhancement Note: The requirements emphasize a blend of deep technical specialization in data center mechanical systems and strong project leadership capabilities. The 8-10 year experience benchmark, particularly in mission-critical environments, indicates a need for a candidate who can operate with a high degree of autonomy and provide strategic direction. Professional certifications are preferred, suggesting the company values formal recognition of expertise.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Data Center Mechanical Design Case Studies: Showcase detailed examples of past data center mechanical design projects, illustrating the scope, complexity, and challenges addressed.

• Process Optimization Examples: Present instances where you successfully improved mechanical system efficiency, reliability, or maintainability through innovative design or process implementation.

• Coordination and Collaboration Demonstrations: Include examples demonstrating your ability to effectively coordinate mechanical designs with other engineering disciplines and stakeholders, highlighting successful integration strategies.

• Compliance and Standards Adherence: Provide evidence of how you ensured designs met specific regulatory requirements, industry standards, and company mandates, perhaps through design checklists or compliance reports.

• Problem-Solving Scenarios: Highlight specific technical challenges encountered in previous roles and detail the analytical and problem-solving steps taken to achieve a successful resolution.

Process Documentation:

• Design Workflow Documentation: Demonstrate your ability to document and standardize mechanical design workflows, from initial concept development through to detailed design and documentation.

• Technical Specification Development: Showcase examples of well-structured and comprehensive technical specifications for mechanical equipment and systems, reflecting best practices.

• Performance Analysis and Reporting: Present examples of how you measured and reported on the performance of mechanical systems, including energy efficiency metrics and reliability data.

📝 Enhancement Note: For a role at this level, a strong portfolio is crucial. Candidates should be prepared to present detailed case studies that not only showcase technical design but also their strategic thinking in areas like efficiency improvements, risk management, and cross-functional collaboration. The emphasis on "process documentation" suggests an expectation for candidates who can contribute to establishing and refining design methodologies.

💵 Compensation & Benefits

Salary Range:

Based on industry benchmarks for a Mechanical Design Manager with 10+ years of experience in a high-demand sector like data centers, and considering the location of Madrid, Spain, with potential for London involvement, the estimated annual salary range is:

• Madrid, Spain: €70,000 - €100,000 per year.

• London, UK: £75,000 - £110,000 per year.

📝 Enhancement Note: The salary range is an estimation based on general market data for similar roles in these European capital cities, factoring in the seniority and specialized nature of data center mechanical design. Specific compensation will depend on the candidate's exact qualifications, experience, and the final negotiation based on the specific location of employment within DayOne's European operations. This estimation uses data from various salary aggregators and recruitment insights for engineering management roles in Spain and the UK.

Benefits:

• Comprehensive Health Insurance: Robust medical, dental, and vision coverage for employees and eligible dependents.

• Retirement Savings Plan: Competitive company-sponsored pension or retirement savings scheme.

• Paid Time Off: Generous annual leave, public holidays, and sick leave allowances.

• Professional Development: Opportunities for continued learning, training, certifications, and attending industry conferences.

• Performance Bonuses: Potential for annual bonuses tied to individual and company performance.

• International Mobility: Opportunities to work on projects across DayOne's European locations.

• Relocation Assistance: Support for candidates who need to relocate to Madrid or London.

Working Hours:

• Standard working hours are typically 40 hours per week, Monday to Friday.

• Flexibility may be required to accommodate project deadlines, international calls across different time zones, and critical commissioning or handover phases.

📝 Enhancement Note: The benefits package is typical for a managerial role in a growing international tech infrastructure company. The inclusion of relocation assistance and potential for international mobility is particularly relevant given the company's expansion and the role's European scope.

🎯 Team & Company Context

🏢 Company Culture

Industry: Data Center Development and Operations. DayOne operates within the rapidly expanding digital infrastructure sector, providing the physical backbone for cloud computing, AI, and large-scale data processing. This industry is characterized by high growth, technological innovation, and critical uptime requirements.

Company Size: DayOne is described as one of the fastest-growing companies in the data center industry, indicating a dynamic and expanding organization. While exact numbers aren't provided, "global leader" and "international markets" suggest a significant, though potentially still agile, operational footprint.

Founded: While the founding date is not specified, the company's current emphasis on rapid expansion and international market entry suggests it is in a growth phase, likely established enough to have developed core standards but still agile enough to be scaling aggressively.

Team Structure:

• Operations & Engineering Focus: The Mechanical Design Manager will likely be part of a larger Engineering or Project Delivery team, working closely with Electrical Design, Project Management, Construction Management, and Data Center Operations teams.

• Cross-Functional Collaboration: Expect regular interaction with site operations personnel to ensure designs are practical for ongoing maintenance and operational efficiency.

• Reporting: The role likely reports into a senior engineering leadership position, such as Director of Engineering or Head of Data Center Design, within the European or Global Engineering division.

Methodology:

• Data-Driven Design: Emphasis on performance metrics like PUE, reliability, and maintainability, suggesting a data-driven approach to design validation and optimization.

• Agile Expansion: The company's rapid growth implies a need for agile planning and execution in design and construction to meet market demands quickly.

• Standards-Based Development: Adherence to DayOne's specific standards, alongside industry best practices and local regulations, indicates a structured approach to design and quality assurance.

Company Website: https://dayonedc.com/

📝 Enhancement Note: DayOne's positioning as a fast-growing global leader in data centers suggests a culture that values innovation, efficiency, and a proactive approach to challenges. For a Mechanical Design Manager, this means being part of a team that is constantly pushing boundaries and adapting to new technologies and market demands in a critical infrastructure sector.

📈 Career & Growth Analysis

Operations Career Level: This is a senior management position within the engineering and design function, specifically focused on mechanical systems for mission-critical facilities. It requires significant technical depth combined with leadership and project management capabilities. The role is crucial for ensuring the foundational mechanical integrity of DayOne's expanding data center portfolio.

Reporting Structure: The Mechanical Design Manager will likely report to a Director or VP of Engineering or Data Center Design, overseeing a team of mechanical engineers and designers or acting as the primary technical authority for mechanical aspects on assigned projects. Collaboration will extend across project management, construction, and operations teams.

Operations Impact: The Mechanical Design Manager's work has a direct and significant impact on the operational reliability, energy efficiency, cost-effectiveness, and scalability of DayOne's data centers. Poor mechanical design can lead to costly downtime, high energy consumption, and operational inefficiencies, directly affecting the company's profitability and reputation.

Growth Opportunities:

• Technical Specialization: Opportunity to become a subject matter expert in advanced data center cooling technologies, sustainable design, and high-density computing infrastructure.

• Leadership Progression: Potential to advance into roles such as Director of Mechanical Engineering, Head of Data Center Design, or broader leadership positions within the European operations or global engineering teams.

• Project Portfolio Expansion: Opportunity to manage increasingly complex and larger-scale data center projects across diverse international markets.

• Cross-Disciplinary Development: Exposure to other critical infrastructure disciplines (electrical, structural, automation) can lead to a more holistic understanding of data center operations and design.

📝 Enhancement Note: This role offers a clear path for career advancement within the specialized and high-growth data center industry. The emphasis on international projects and rapid scaling provides a unique opportunity for professionals seeking significant impact and leadership development in a critical infrastructure domain.

🌐 Work Environment

Office Type: The role is primarily based at DayOne's Corporate Office in Madrid, Spain, with potential travel and collaboration with the London office. This implies a professional office environment conducive to design work, team meetings, and strategic planning.

Office Location(s):

• Madrid, Spain: Corporate Office, serving as the primary work location.

• London, UK: Potential for collaboration, meetings, or site visits, indicating a need for flexibility in location engagement.

Workspace Context:

• Collaborative Design Hub: The office environment likely fosters collaboration with engineering peers, project managers, and other stakeholders, facilitating efficient design reviews and problem-solving sessions.

• Technology-Enabled: Access to necessary design software, communication tools, and potentially VR/AR technologies for design visualization and review.

• International Team Interaction: Opportunities to connect and collaborate with a global team, leveraging diverse perspectives and expertise in real-time.

Work Schedule:

• The standard 40-hour work week is expected, with potential for extended hours during critical project phases such as design deadlines, intensive commissioning periods, or urgent operational support needs. Flexibility is key in this high-stakes industry.

📝 Enhancement Note: The work environment is structured to support complex engineering design and international project management. While based in an office, the nature of data center projects means there will be a need for on-site visits to project sites during construction and commissioning phases, requiring adaptability.

📄 Application & Portfolio Review Process

Interview Process:

1. Initial Screening: HR or Talent Acquisition will conduct an initial review of your resume and qualifications to ensure alignment with the basic requirements.

2. Hiring Manager Interview: A detailed discussion with the Hiring Manager (likely the Director of Engineering or equivalent) to assess technical expertise, leadership experience, and cultural fit. Be prepared to discuss specific projects and challenges.

3. Technical Assessment/Portfolio Review: This may involve a technical interview with senior engineers or a formal presentation of your portfolio. Expect to walk through case studies, explain design decisions, and discuss your approach to problem-solving and coordination.

4. Cross-Functional Interviews: Interviews with key stakeholders from other departments (e.g., Operations, Construction) to evaluate collaboration skills and understanding of end-to-end project lifecycle.

5. Final Interview: Potentially with a senior executive for a final assessment of strategic alignment and leadership potential.

Portfolio Review Tips:

• Structure for Impact: Organize your portfolio logically, perhaps by project type or by key skills demonstrated. Start with your most relevant and impressive data center projects.

• Quantify Achievements: For each project, clearly state the problem, your role, the solution, and quantifiable results (e.g., % improvement in energy efficiency, reduction in cooling costs, successful commissioning on time, avoidance of specific risks).

• Highlight Design Philosophy: Be ready to articulate your approach to mechanical system design, emphasizing reliability, scalability, maintainability, and energy efficiency.

• Showcase Coordination Skills: Use examples to illustrate how you managed interfaces with electrical, architectural, and operational teams, demonstrating your ability to foster collaboration.

• Address Challenges: Be prepared to discuss complex technical challenges you faced and how you overcame them, showcasing your problem-solving acumen.

Challenge Preparation:

• Design Scenario: You might be presented with a hypothetical data center mechanical design challenge and asked to outline your approach, key considerations, and potential solutions.

• Process Improvement Exercise: You may be asked to analyze a current mechanical design process or operational issue and propose improvements.

• Stakeholder Management Scenario: Be ready to discuss how you would handle a disagreement or conflict with another department regarding mechanical design requirements.

📝 Enhancement Note: The interview process emphasizes both technical depth and the ability to collaborate and lead. A strong, well-prepared portfolio that clearly articulates achievements and demonstrates a strategic approach to mechanical design in critical environments will be essential for success. Be ready to discuss not just what you designed, but why and how it delivered value.

🛠 Tools & Technology Stack

Primary Tools:

• CAD/BIM Software: Proficiency in industry-standard tools such as AutoCAD, Revit MEP, or similar for detailed mechanical design and documentation.

• CFD Analysis Tools: Experience with Computational Fluid Dynamics (CFD) software (e.g., ANSYS Icepak, Autodesk CFD) for detailed airflow and thermal analysis is highly advantageous.

• Project Management Software: Familiarity with project management platforms (e.g., MS Project, Asana, Jira) for tracking design progress and coordinating tasks.

Analytics & Reporting:

• Data Analysis Tools: Ability to interpret data from Building Management Systems (BMS), SCADA, and sensor networks to analyze mechanical system performance.

• Reporting Tools: Proficiency in generating comprehensive technical reports, specifications, and performance analyses using standard office suites (e.g., Microsoft Office Suite).

CRM & Automation:

• While not directly managing CRM in this role, understanding how mechanical system data integrates with broader building management or operational platforms is beneficial.

• Familiarity with Building Management Systems (BMS) and DCIM (Data Center Infrastructure Management) software for monitoring and controlling mechanical systems.

📝 Enhancement Note: The technology stack focuses on core engineering design tools and data analysis relevant to mechanical systems performance. While specific CRM or automation tools for sales/revenue operations are not primary, knowledge of BMS and DCIM systems is crucial for understanding how mechanical designs impact overall data center operations and efficiency.

👥 Team Culture & Values

Operations Values:

• Reliability and Uptime: A fundamental commitment to ensuring the highest levels of reliability and availability for critical data center infrastructure.

• Efficiency and Sustainability: Driving energy efficiency in mechanical designs to reduce operational costs and environmental impact, aligning with global sustainability goals.

• Innovation and Continuous Improvement: Encouraging the adoption of new technologies and methodologies to enhance design quality, performance, and cost-effectiveness.

• Collaboration and Teamwork: Fostering a cooperative environment where diverse teams (engineering, construction, operations) work together seamlessly to achieve common goals.

• Accountability and Ownership: Taking responsibility for design outcomes and ensuring successful project delivery from conception through to operational handover.

Collaboration Style:

• Cross-Functional Partnership: Expect a collaborative environment where mechanical engineers work hand-in-hand with electrical engineers, construction managers, project managers, and data center operations teams.

• Open Communication: A culture that values clear, direct, and respectful communication, encouraging feedback and constructive debate to refine designs and resolve issues.

• Knowledge Sharing: Encouraging the sharing of best practices, lessons learned, and technical insights across project teams and departments to foster collective growth and expertise.

📝 Enhancement Note: DayOne's culture appears to be built around the core demands of operating critical infrastructure: unwavering reliability, continuous innovation, and strong teamwork. For a Mechanical Design Manager, this means being part of a highly professional and results-oriented group that values both technical excellence and collaborative problem-solving.

⚡ Challenges & Growth Opportunities

Challenges:

• Rapidly Evolving Technology: Keeping pace with advancements in cooling technologies, high-density computing demands, and energy-efficient solutions in the fast-moving data center industry.

• International Regulatory Landscape: Navigating diverse and potentially complex building codes, environmental regulations, and authority requirements across different European countries.

• Balancing Performance and Cost: Optimizing mechanical designs to meet stringent performance requirements (reliability, efficiency) while adhering to project budget constraints.

• Global Project Coordination: Managing design and implementation across multiple international projects simultaneously, requiring strong organizational and communication skills to bridge geographical and cultural divides.

Learning & Development Opportunities:

• Advanced Cooling Technologies: Deep dive into cutting-edge cooling solutions like liquid cooling, advanced economizers, and adiabatic cooling systems.

• Sustainable Design Certifications: Pursuing certifications like LEED AP or BREEAM Assessor to enhance expertise in green building practices.

• Data Center Infrastructure Management (DCIM): Developing a deeper understanding of how mechanical systems integrate with broader DCIM platforms for optimized operations.

• Leadership Training: Opportunities for formal leadership development programs to hone management and strategic planning skills.

• Industry Conferences and Networking: Attending major data center and engineering conferences to stay abreast of trends and build professional networks.

📝 Enhancement Note: This role presents significant challenges due to the dynamic nature of the data center industry and international operations. However, these challenges are directly linked to substantial growth and learning opportunities, making it an attractive position for ambitious engineering leaders.

💡 Interview Preparation

Strategy Questions:

• Design Philosophy & Approach: "Describe your design philosophy for mission-critical data center mechanical systems. How do you balance reliability, efficiency, and maintainability?" (Be ready to cite specific examples and industry standards).

• Problem-Solving Scenario: "Walk me through a complex mechanical design challenge you faced on a previous data center project. What was the problem, what steps did you take, and what was the outcome?" (Focus on your analytical process and decision-making).

• Coordination & Collaboration: "How do you ensure effective coordination between mechanical design and other disciplines (electrical, structural, operations) to avoid clashes and optimize integration?" (Provide examples of successful cross-functional projects).

• Standards & Compliance: "How do you stay current with evolving mechanical engineering standards, energy efficiency regulations, and data center best practices in Europe?" (Mention specific sources and your process for adherence).

Company & Culture Questions:

• Alignment with DayOne: "Why are you interested in DayOne, and how do your skills and experience align with our mission to build global data infrastructure?" (Research their recent projects, news, and values).

• Team Contribution: "What do you believe are the key contributions a Mechanical Design Manager makes to a growing data center company like DayOne?" (Highlight impact on reliability, efficiency, and scalability).

• Handling Ambiguity: "In a fast-paced, growing company, there can be ambiguity. How do you approach situations where project requirements or timelines are not fully defined?" (Showcase adaptability and proactive problem-solving).

Portfolio Presentation Strategy:

• Concise Storytelling: For each case study, tell a clear story: the challenge, your role, the solution, and the impact. Keep it focused and relevant to the job description.

• Visual Aids: Use clear diagrams, schematics, or photos (if permissible) to illustrate your designs and the systems you worked with.

• Quantify Results: Emphasize measurable outcomes – energy savings, cost reductions, uptime improvements, successful commissioning – to demonstrate ROI.

• Highlight Collaboration: Explicitly mention how you worked with other teams and stakeholders, showcasing your cross-functional capabilities.

• Prepare for Q&A: Anticipate questions about your design choices, alternative solutions considered, and lessons learned.

📝 Enhancement Note: Thorough preparation for this interview process is key. Candidates should be ready to demonstrate not only their technical prowess but also their strategic thinking, leadership potential, and ability to integrate into a high-growth, demanding environment. The portfolio presentation is a critical opportunity to showcase practical application of skills.

📌 Application Steps

To apply for this Mechanical Design Manager position:

• Submit Your Application: Navigate to the provided Workday job portal link and complete the online application.

• Tailor Your Resume: Ensure your resume clearly highlights your 8-10+ years of experience in mechanical design, specifically within mission-critical environments like data centers. Use keywords from the job description (e.g., HVAC, cooling infrastructure, PUE, reliability, compliance, multidisciplinary coordination).

• Prepare Your Portfolio: Curate a professional portfolio that showcases 2-3 key data center mechanical design projects. Focus on demonstrating your ability to lead design, manage complex coordination, achieve efficiency targets, and ensure compliance. Be ready to present this during the interview process.

• Research DayOne: Familiarize yourself with DayOne's mission, recent projects, industry standing, and company values. Understand their focus on international expansion and data center infrastructure.

• Practice Your Responses: Prepare answers to common interview questions, focusing on behavioral examples that demonstrate your technical expertise, leadership, problem-solving skills, and collaborative approach. Rehearse your portfolio presentation.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.