Role Description We are seeking a highly technical, impact-driven Senior Systems Engineer to own, scale, and protect our core email transmission infrastructure. In this role, your golden rule will be Reputation Above All. You are not just managing email lists or monitoring dashboards; you will architect and maintain the high-availability server infrastructure, Mail Transfer Agents (MTAs), and automated defensive systems that ensure our legitimate traffic hits the inbox while bad actors are ruthlessly contained. The ideal candidate bridges the gap between deep Linux systems administration, network engineering, and advanced email deliverability strategy. You will have a massive impact on the company by safeguarding our global IP/domain reputation, minimizing blast radiuses, and ensuring zero-downtime mail operations across our entire infrastructure network. Core Responsibilities - Infrastructure Management & High Availability - MTA Optimization: Maintain and configure core MTAs (Postfix, Postal) and IMAP/POP3 servers (Dovecot), ensuring graceful reloads over restarts to prevent dropping active connections. - Traffic Routing & Load Balancing: Utilize HAProxy and network routing protocols (like BGP via FRRouting) to distribute outbound traffic and architect high-volume failover mechanisms. - Redundancy & Failover: Administer backend infrastructure databases (PostgreSQL replica setups) and maintain dedicated "Block" backup/archive servers to instantly take over the workload of a failed primary "Cube" server. - Architectural Segregation: Maintain strict workload isolation across our infrastructure network—separating standard nodes for mail stacks, specialized injection nodes (Postal), and separate archiving/backup systems to prevent high-volume senders from degrading performance. - Deliverability Engine & Authentication Protocol Architecture - Protocol Enforcement: Act as the absolute technical authority on DNS and authentication setups, maintaining flawless configurations for SPF, DKIM, DMARC, and BIMI. - Traffic Throttling: Implement automated, MTA-level dynamic throttling to handle 4xx deferrals instantly, preventing a single high-volume sender from triggering global rate limits across our shared IP pools. - Warm-up Strategy: Design and guide automated IP/Domain Warm-up Plans for new infrastructure, managing incremental volume scaling over 2–4 week cycles. - Edge Security, Anti-Abuse & Incident Response - Outbound Spam Filtering: Configure and optimize Rspamd to actively scan, flag, and quarantine highly spammy content before it exits our network. - Edge Defense: Deploy automated connection-dropping systems (Fail2Ban, custom SMTP blocker scripts) to mitigate authenticated attacks, brute-force attempts, and malicious traffic. - Blast Radius Mitigation: Program and maintain a dynamic IP pooling engine ("The Penalty Box") to instantly isolate accounts displaying poor metrics away from prime Tier-1 IP pools. - Blocklist Remediation: Act as the primary responder to major DNSBL listings. Leverage log analysis to locate the root cause account, plug the security leak, and submit expert delisting requests. - Observability & Monitoring - Log Shipping Architecture: Build and manage high-performance log aggregation pipelines using Vector to ship system and MTA data into a centralized repository for real-time auditing and incident response. - Network Auditing: Utilize IPAudit and custom tools to continuously scan for bandwidth anomalies, connection spikes, or compromised user credentials. - Dashboard Management: Actively monitor ISP infrastructure portals daily along with third-party tracking tools. Qualifications - 5+ years of experience as a Linux Systems Administrator, DevOps, or Infrastructure Engineer with deep networking knowledge (TCP/IP, routing, ports, DNS management). - Expert-level proficiency configuring, debugging, and optimizing enterprise mail tools such as Postfix, Dovecot, or Postal. - Hands-on experience writing rules and maintaining mail-filtering/anti-abuse applications like Rspamd and Fail2Ban. - Proven experience building or maintaining log pipelines using Vector or similar high-scale telemetry frameworks. - Experience implementing network routing layer tools (HAProxy, FRRouting) and relational databases (PostgreSQL replication). - Strong familiarity with automated SSL/TLS certificate rotation and multi-node compliance monitoring. Requirements - Deep comprehension of the difference between Delivery (server handoff) and Deliverability (inbox placement). - Expert parsing of aggregate DMARC reports using platforms like DMARCian, Valimail, or Postmark. - Strict commitment to Acceptable Use Policies (AUP): zero tolerance for purchased/scraped lists and a firm grasp on Feedback Loop (FBL) automated triage. Key Performance Indicators (KPIs) - Global Infrastructure Spam Complaint Rate: Maintained strictly under 0.1%. - Global Hard Bounce Rate: Kept consistently below 2.0%. - Infrastructure Uptime: 99.99% availability across all outbound MTAs and mail relays. - Incident Isolation Time: Transitioning high-risk or abusive senders to the "Penalty Box" or circuit-breaking campaigns within minutes of a threshold breach. This is a highly technical systems engineering role, not a marketing or email campaign management position. To be considered, you must have hands-on experience configuring Linux mail servers at the command-line level. Please confirm upon applying that the fixed compensation range of $50,000 to $72,000 USD per year aligns with your expectations.

Title: Registration Systems Specialist Location: Fenton, MO Job Description: Where Human Connection Fuels Possibility ​ At Maritz, decades of innovation and perseverance have built more than just a strong reputation — they’ve shaped a culture where human connection and collaboration are at the heart of everything we do. ​ Joining Maritz means becoming part of a workplace grounded in a critical truth; people and their potential is our greatest resource. ​ Maritz helps companies achieve their business goals by inspiring people to perform their best. We design experiences, incentives, and recognition programs that spark action and deliver measurable impact.​ And we’ve brought this human-first design inward – intentionally building teams that care for each other and collaborate powerfully. In our most recent employee survey, nearly 90% of respondents said that their managers care about their concerns and 82% said they feel genuinely appreciated. We know that when employees feel seen, supported, and celebrated for who they are, they thrive and so does our business. ​ That’s why we’ve created a flexible, environment that empowers you to do your best work without sacrificing what matters most to you. In fact, in that same survey, nearly 90% of respondents said they have the flexibility they need to balance work and personal life and nearly 80% said Maritz does a great job prioritizing employee well being.​ We have a passion for excellence and genuine care for the people making it possible. Top meeting planners, sales operations and procurement teams at Fortune 100 companies trust Maritz Global Events as their event management services partner. We’re here to help deliver business meetings and incentive travel programs that make an impact with customers, employees and stakeholders. Unlike other event management companies, we take a science-based approach to corporate event management. We use the latest findings from neuroscience researchers to design and execute events that transform businesses and people. We focus on individual business objectives that drive business results and improve engagement with customers, employees and channel partners. But it's our team that really set up apart. The drive behind our power is our team's passion. We aren't just passionate about corporate event management. We're also passionate about our team and our culture. A great work culture doesn't happen by accident. Guided by our Signature Core Value - First, Take Good Care of Each Other - the Maritz Global Events culture has been consciously designed to connect every single one of our people to the purpose and beliefs that we are working toward every day. What You’ll Be Doing - Manage guest phone calls and communicate travel itineraries, hotel confirmations, and cancellation policies via phone and email. - Maintain documentation of all email correspondence regarding guest changes and coordinate program activity within the back‑office system (registrations, hotel room inventory, activity selection, reporting). - Ensure client expectations and guidelines are met and provide onsite teams with supporting documentation and information. - Maintain and monitor client email boxes and winners’ lists within client SLA, communicating updates to the Meeting Event Manager and team members. - Secure pre/post‑hotel extensions and communicate guest hotel changes to hotel contacts. - Review and test websites prior to launch and conduct regular quality reviews of applicable reports. - Support the Deviation/Exception Grid process and complete accounting functions per client specifications. - Research and resolve customer inquiries, including accounting issues, FOP questions, vendor issues, and hotel no‑shows. - Attend ongoing training, department meetings, and program meetings; perform special assignments, including potential onsite program operations. - Provide guidance and leadership during emergencies or high‑volume periods, supporting crisis procedures as needed. What You’ll Bring - Bachelor’s degree or equivalent travel industry experience (Hospitality or Event Management degree a plus). - Proven record of strong customer service skills. - High attention to detail and strong problem‑solving skills to research and resolve customer inquiries. - Professional oral and written communication skills, along with effective listening abilities. - Strong MS Office skills (Outlook, Excel, Word) and the technical aptitude to learn new technology. Nice to Have - Experience supporting onsite program operations. - Background working with travel vendors, hotels, or event management systems. - Familiarity with crisis procedures or high‑volume travel operations. Working Logistics & Things You Should Know - This is a Hybrid role. - Onsite expectations can be defined based on team or program needs. - This position operates on CST. DISCLAIMER: This job description is designed to indicate the general nature and level of work performed by associates within this classification. It is not designed to confirm or be interpreted as a comprehensive summary of all duties, responsibilities and qualifications required of associates assigned to this job. Maritz offers a comprehensive benefits package for full-time employees including medical, dental, vision, life insurance, disability, paid parental leave, 401k, tuition reimbursement, paid time off, year end holiday closure, and more! View all details at: www.MaritzBenefits.com Maritz will only employ applicants who have authorization to work permanently in the U.S. This is not a position for which sponsorship will be provided. Those who need sponsorship for work authorization now or in the future are not eligible for hire. No calls or agencies please. Maritz is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to sex, race, color, religion, national origin, age, marital status, political affiliation, sexual orientation, gender identity, genetic information, disability or protected veteran status. We are committed to providing a workplace free of any discrimination or harassment. If you have a disability and are having difficulty accessing or using this website to apply for a position, you can request help by calling 1-636-827-0380 or by sending an email to recruitment@maritz.com.

• Partner with our Account teams to provide pre-sales technical systems engineering support for our enterprise/commercial customers • Act as a trusted advisor for our customers to gather requirements and identify opportunities with existing and new customers • Conduct white board network architectural reviews • Deliver Arista product presentations of Arista’s networking solutions portfolio • Architect, design and propose Arista Data Center solutions using leaf-spine architectures and (VxLAN, EVPN) network overlays to capture additional sales • Work with the Proof of Concept team to perform hands-on tests to validate customer proof-of-concept setups • Provide feedback to Product Management and Engineering • Represent Arista at customer and industry events and conferences • Maintain proficiency in competitive solutions, products, and services

• Act as a trusted advisor to our customers, gathering requirements, qualifying opportunities, and designing solutions. • Collaborate with Arista Account Managers for an in-depth understanding of enterprise and commercial clients. • Conduct architectural designs to develop solutions that improve network performance, efficiency and customer TCO. • Conduct product presentations of Arista's networking solutions. • Utilize expertise in network design and implementation to create scalable network solutions. • Work with customers and proof-of-concept teams to validate network designs and deployments. • Collaborate with the sales team to respond to RFP/RFQs and provide feedback to Product Management and Engineering. • Author and collaborate on customer-facing content highlighting Arista technology and products.