Office Administrator & Accounting Support at 3rd Millennium Classrooms – San Antonio, Texas

3rd Millennium Classrooms is on a mission to change behavior through education. Since 1999, we have partnered with higher education institutions, court systems, secondary school districts, and organizations nationwide to deliver engaging, evidence-based courses that make a real difference. When you join our team, you’re not just selling a product — you’re helping people change their lives.

• Innovative — forward-thinking, agile, and unafraid to take smart risks that drive meaningful impact.
• Team-oriented — drama-free, respectful, and accountable; we collaborate across teams to make things right and deliver results.
• Tenacious — persistent and determined, we approach challenges with resilience and a growth mindset.
• Ethical and emotionally intelligent — we act with honesty, empathy, and professionalism in every interaction.

We’re looking for a highly organized, proactive, and detail-oriented Office Administrator to support day-to-day operations and help keep our team running efficiently. This role is ideal for someone who enjoys administrative responsibilities with light accounting functions, thrives in a fast-paced environment, and takes pride in accuracy, organization, and follow-through.

As an Office Administrator at 3rd Mil, you’ll play a key role in office operations, customer support, and accounting billing/receiving processes. You’ll serve as a central point of coordination for Help Desk support and internal operations, working closely with teams across the company to support a well-organized, productive workplace.

• Answer incoming Help Desk support calls and ensure timely assistance
• Expedite resolution of support requests through JIRA to maximize customer satisfaction
• Identify patterns or recurring issues and proactively alert technical staff
• Share insights from frontline support with internal teams to improve processes
• Support Client Success with kit assembly and shipping as needed
• Manage office inventory, including mailing, print, and conference supplies
• Coordinate conference logistics and preparation
• Handle shipping and deliveries (USPS, UPS, FedEx, etc.)
• Run errands and provide general support to the physical office team
• Process and deposit checks; assist with invoice payments
• Investigate and resolve customer chargebacks
• Maintain office cleanliness and coordinate cleaning/maintenance services
• Plan and organize team events, outings, and celebrations
• Manage digital systems including HubSpot basics and Vonage phone system
• Maintain shared calendars and organize paper/digital files
• Support cross-functional teams by taking on additional tasks as needed
• Continuously improve through feedback and professional development

• Understanding of A/R and A/P processes
• Experience with Google Workspace and Microsoft Office tools
• Excellent organizational, prioritization, and time management skills
• Strong communication skills (verbal and written)
• Attention to detail and strong proofreading ability
• Ability to multitask and manage competing priorities effectively
• Comfort working independently in a fast-paced environment
• Proactive, problem-solving mindset
• Ability to quickly learn new systems and technologies
• Openness to feedback and a growth-oriented attitude

• Answer Help Desk calls promptly and return voicemails within one hour
• Respond to or reassign all JIRA tickets within one hour
• Escalate critical issues to the appropriate team members quickly
• Maintain adequate office and mailing supply levels at all times
• Process mail, shipments, and deposits daily
• Ensure office cleanliness and coordinate maintenance as needed
• Successfully plan and execute team events and office activities
• Contribute to process improvements through proactive communication
• Dedicate at least 5 hours per month to professional development

• Health, dental, and vision insurance
• Health savings account (HSA) with company match
• 401(k) with company match
• Long-term Disability insurance
• Paid time off and holidays
• Opportunities for professional growth and advancement
  
  

Ready to make an impact?

Apply today and help us make an impact nationwide through meaningful, behavior-changing education.