Outsourcing Services International

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3.6/5 · Glassdoor
OA500 Global Outsourcing Firm Index, 2026 Source Partner - inactive badge
Company at a glance
Employee range
100-249
Company listing
Annual revenue
$10 mil. - $25 mil.
Company listing
Delivery countries
2
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Overview

Headquarters
Edificio Avante 4-01, 01502, Antiguo Cuscatlan, La Libertad, El Salvador
Ownership
Private
Industries
Financial Services, Healthcare, Insurance, Tech support, Telecoms, Travel

Details

Year founded
2010
Countries of fulfillment
El Salvador
Sectors
Admin Support, Back Office Support, Customer Service, Finance & Accounting, Human Resource & Legal, Inbound & Outbound, IT Services and IT Consulting, Technical Support

Contact information

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Services & delivery

Workforce & hiring

Scale & company milestones

Annual revenue

$10 mil. - $25 mil.

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About Outsourcing Services International: Review and comparison

Outsourcing Services International (OSI) is a nearshore business process outsourcing and customer contact provider headquartered in Antiguo Cuscatlán, El Salvador. Founded in 2010, it supports businesses in the United States, Canada and Europe with multilingual staff across front-office, back-office and technology functions.

OSI’s BPO services include knowledge process outsourcing, in which specialists handle core functions such as finance, marketing, graphic design and IT support, together with back-office work such as data management and payment processing and front-office customer relations. Customer service outsourcing places client customers with trained representatives, while sales outsourcing covers lead generation, appointment setting and closing sales.

In technology, OSI provides IT support, help desk support, security and system administration, DevOps and cloud engineering, software development and telecom engineering. The company says it runs a Network Operations Center staffed by trained and certified IT professionals, along with network monitoring and network engineering services.

The company also supports finance and people functions. Its accounting team handles accounts payable, revenue assurance, collections and customer billing. Human resources, administrative support, marketing, operations outsourcing and project coordination services complete the offer.

OSI describes its approach as creating a boutique environment for each client, with dedicated employees who are trained and managed by the client to fit its culture and work exclusively on its business. The company highlights El Salvador’s proximity to the United States, a two- to three-hour flight from many US cities, as a practical advantage for collaboration and site visits. Its stated focus areas include sales, telecom, finance, healthcare, insurance, travel and technical support. The company says its personnel are highly specialized in their chosen fields and truly become part of the client team.

OSI suits North American and European companies that want dedicated nearshore staff in a US-friendly time zone, particularly those combining customer contact and sales with IT support, accounting or back-office functions under a single provider.

Outsourcing Services International’s contact information

Outsourcing Services International’s main headquarters is located in:

Headquarters location Edificio Avante 4-01, 01502, Antiguo Cuscatlan, La Libertad, El Salvador

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