Senior AP Specialist

Security Equipment Supply; Earth City (MO); Hybrid; USD 30,000 - 47,000; Full time

Benefits offered by this job

SEP IRA & profit sharing

Health benefits

Career growth

Hybrid flexibility

Job summary

Security Equipment Supply, Inc. (SES) is seeking a Senior AP Specialist to own the desk end-to-end in a hybrid environment. You will manage the full AP lifecycle for the vendor portfolio and serve as a line of defense for cash.

You’ll process PO invoices with 3-way matching, handle non-PO invoices, code and resolve issues, onboard vendors, and maintain audit-ready documentation while ensuring timely payments.

Qualifications

• High school diploma or equivalent; accounting/business coursework a plus.
• ERP experience required; Microsoft Dynamics 365 Finance & Supply Chain preferred.
• 5+ years of AP experience with full invoice-cycle ownership.

Responsibilities

• Own your own vendor book as the single point of contact for inquiries and discrepancies.
• Process PO invoices, supported by an automated 3-way match.
• Process all non-PO invoices (professional services, utilities, ops vendors, subscriptions).
• Validate, code, and resolve invoice issues promptly.
• Handle vendor onboarding documentation and setup/change requests per policy.
• Prepare payment batches and maintain audit-ready documentation and approval trails.

Skills

Vendor management

Attention to detail

Independent worker

Problem solving

Education

High school diploma or equivalent

Accounting or business coursework a plus

Tools

ERP systems (Dynamics 365)

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Senior AP Specialist

Ap Spec Earth City, MO, US

Senior AP Specialist

Security Equipment Supply, Inc. (SES)

Job Title:Senior AP Specialist

Company:Security Equipment Supply, Inc. (SES)

Location:Earth City, MO

Job Type:Full-Time | Non-Exempt (Hourly) | Hybrid Work Model

About Security Equipment Supply (SES)

Security Equipment Supply (SES) is a second-generation, family-owned distributor of low-voltage electronics. Since 1982, we've grown to 16 locations across 11 states, delivering trusted solutions in access control, fire and life safety, surveillance, home entertainment, and more.

We're in a transformative phase-modernizing operations, investing in technology, and enhancing customer and employee experiences. SES is committed to growing talent from within and creating meaningful career paths across the organization. Most roles are hybrid, providing flexibility while driving impact.

At SES, we don't just work here - we care for what we've built and the people we work with.

Live the SES Way: Family

Respect

Celebration

Integrity

Work the SES Way: Curiosity

Fun-Loving Spirit

Commitment to Growth

About The Role

Security Equipment Supply is looking for a Senior AP Specialist who wants full ownership of a desk - not a seat processing someone else's workload.

Yes, invoices need to be processed and vendors need to be paid. But this is not a role where you wait to be handed a stack and told what to do with it. You'll own the complete vendor relationship and the full non-PO invoice lifecycle for the entire portfolio, working independently and using sound judgment within policy. Just as important, you'll be a line of defense for the company's cash - someone who catches what's off before it becomes a real problem, not just someone who processes what's in front of them.

What You'll Do

• Own your own vendor book as the single point of contact for inquiries and discrepancies
• Process PO invoices, supported by an automated 3-way match
• Process all non-PO ("cost") invoices - professional services, utilities, operational vendors, subscriptions, and anything without a PO
• Validate, code, and resolve invoice issues
• Handle vendor onboarding documentation and setup/change requests per policy
• Prepare payment batches and maintain audit-ready documentation and approval trails

Who You Are

If you're the kind of AP Specialist who runs your own desk, resolves problems before they're escalated to you, and doesn't need constant direction to keep a full vendor portfolio moving, we'd like to talk with you. You take ownership seriously-questioning something that looks off rather than waving it through just to clear your queue.

What We're Looking For

Education:High school diploma or equivalent; coursework in accounting or business a plus

Training & Certifications:ERP experience required; Microsoft Dynamics 365 Finance & Supply Chain preferred

Work Experience

• 5+ years of AP experience with full invoice-cycle ownership
• Track record of independent vendor communication and discrepancy resolution
• Working knowledge of Use Tax concepts, or ability to learn quickly

How We Measure Success

• Invoice processing accuracy and timeliness
• Vendor relationship quality and response time
• Documentation completeness and audit readiness
• Catching and flagging issues before they become payment or compliance problems
• Smooth handoff of approval routing as automated workflows come online

Why Join SES?

You'll have real ownership of your portfolio within a framework of clear policy and accountability. You'll be part of a team that values independence, expects accuracy, and respects people who can run their own desk with confidence.

• Profit sharing & retirement: SEP IRA contributions and annual profit-sharing bonuses
• Health benefits: affordable medical, dental, and vision plans
• Career growth: ongoing development, advancement opportunities, and a promote-from-within culture
• Hybrid flexibility: 3 days in-office, 2 days remote per week after an initial training period

Work Environment and Physical Demands

• Standard office setting
• Ability to lift up to 25 lbs occasionally

Ready to Own the Desk?

Be part of a growing company where your work matters, your growth is supported, and your success is celebrated.