Justin Mann
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Justin Mann Email & Phone Number

Senior Accountant at Castellum Inc.
Location: Columbia, Maryland, United States 4 work roles 3 schools
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✓ Verified Jul 2026 3 data sources Profile completeness 100%

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Current company
Role
Senior Accountant
Location
Columbia, Maryland, United States
Company size

Who is Justin Mann? Overview

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Quick answer

Justin Mann is listed as Senior Accountant at Castellum Inc., a with 2 employees, based in Columbia, Maryland, United States. AeroLeads shows a matched LinkedIn profile for Justin Mann.

Justin Mann previously worked as Staff Accountant at Rose Financial Solutions and Accounting Associate II at Rose Financial Solutions. Justin Mann holds Bachelor'S Degree, Accounting, 3.5 from University Of Maryland Global Campus.

Company email context

Email format at Castellum Inc.

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Castellum Inc.

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Profile bio

About Justin Mann

Seasoned financial professional with 5+ years of solid and progressive experience in all facets of accounting, accounts payable, accounts receivable, billing, cash receipts, labor distribution, time and expense entry, bank, credit card, and other account reconciliations, and general ledger work. Excels independently and collaboratively to manage competing projects and deadlines with excellent attention to detail.

Listed skills include Microsoft Office, Microsoft Excel, and Accounting.

Current workplace

Justin Mann's current company

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Castellum Inc.
Castellum Inc.
Senior Accountant
bethesda, maryland, united states
Website
Employees
2
AeroLeads page
4 roles

Justin Mann work experience

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Senior Accountant

Current

Columbia, Maryland, United States

- Executes general accounting and financial reporting in accordance with Generally Accepted Accounting Principles (GAAP).- Implements accounting activities including:o Prepares journal entries, month-end accruals, month-end closing entries, account reconciliations, and the preparation of financial statements. o Ensures all deadlines under a tight month-end close schedule are completed. o Maintains high quality standards for all transactions.- Coordinates multiple resources to ensure proper recording of intercompany activity. - Evaluates accounting processes for improvements and efficiencies.- Collaborates closely with the accounting team for proper coding, bookings, re-classes, and adjustment.- Supports Accounting system setup and configuration.- Independently built and managed my company’s treasury system whereby hundreds of our clients’ monthly bank and credit card statements and thousands of transactions are automated into our internal systems- Assist clients with creating view-only users for their bank and credit card accounts

Aug 2023 - Present

Staff Accountant

Rockville, Maryland, United States

- Prepared thousands of billing invoices on behalf of dozens of clients.- Researched all discrepancies between client and customer records over multiple years.- Managed competing billing deadlines throughout the month to ensure timely delivery.- Submitted invoices across multiple platforms including WAWF, BillQuick, and IPP.- Ensured AR aging reports tied out over multiple systems.- Reconciled over 50 bank accounts per month.- Requested transaction support throughout the month to ensure month end closes were delivered on time.- Coordinated with different departments to accurately track expenses and deposits.- Two-time “Solid as a Rock” Award-winner, as voted on by colleagues and management.

Jul 2020 - Dec 2021

Accounting Associate Ii

Rockville, Md

- Coded and processed thousands of vendor invoices on behalf of dozens of clients.- Reconciled AP aging reports across multiple systems.- Submitted weekly payment batches.- Alerted clients when off cycle payments were necessary.- Responded to client and vendor inquiries and conducted various accounting research. - Proactively called vendors when invoicing errors were discovered.- Trained new employees on procedures.- Managed the installment of a high-volume AP client to sync with internal workflow.- “Solid as a Rock” Award-winner, as voted on by colleagues and management.

Apr 2019 - Jun 2020

Purchasing Coordinator

Crofton, Md

I work primarily in the purchasing department where I process variance purchase orders. I also work with accounts payable by entering invoices and assisting with check runs.

Dec 2018 - Apr 2019
Team & coworkers

Colleagues at Castellum Inc.

Other employees you can reach at castellumus.com. View company contacts for 2 employees →

3 education records

Justin Mann education

FAQ

Frequently asked questions about Justin Mann

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What company does Justin Mann work for?

Justin Mann works for Castellum Inc..

What is Justin Mann's role at Castellum Inc.?

Justin Mann is listed as Senior Accountant at Castellum Inc..

Where is Justin Mann based?

Justin Mann is based in Columbia, Maryland, United States while working with Castellum Inc..

What companies has Justin Mann worked for?

Justin Mann has worked for Castellum Inc., Rose Financial Solutions, and Caruso Homes, Inc..

Who are Justin Mann's colleagues at Castellum Inc.?

Justin Mann's colleagues at Castellum Inc. include James Murphy, Laura Seader, Emily Mosso, Vienny Le, and Alan M..

How can I contact Justin Mann?

You can use AeroLeads to view verified contact signals for Justin Mann at Castellum Inc., including work email, phone, and LinkedIn data when available.

What schools did Justin Mann attend?

Justin Mann holds Bachelor'S Degree, Accounting, 3.5 from University Of Maryland Global Campus.

What skills is Justin Mann known for?

Justin Mann is listed with skills including Microsoft Office, Microsoft Excel, and Accounting.

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