A Boston-area logistics company has officially announced plans to open a branch in Belfast.

OnProcess Technology will open a "service delivery center" in a 35,000-square-foot wing of the Bank of America complex on Route 3. The company is initially planning to hire 50 full- and part-time employees in positions ranging from entry-level to managerial, and could add up to 350 more, according to a May 17 press release.

CEO Ed Barry noted the growth of OnProcess Technology, which doubled its workforce in 2014 to more than 2,200 people, according to the company.

“As a Massachusetts-based company, we wanted to expand in New England, and Belfast was the ideal location," Barry said in a statement accompanying Monday's announcement. "Not only were we attracted by Belfast’s vibrant business community and highly skilled workforce; its proximity to major universities, several of which have supply chain curricula, also makes the area great for recruiting employees. With the help of Maine & Company, the support of the Maine government, and the great local cooperation and support from the city of Belfast, we were able to secure a facility that meets all our capacity, commutability and environment needs.”

Company literature describes OnProcess Technology as "a managed services provider specializing in complex, global service supply chain operations — the flow of people, parts and services following the sale of a product."

"If a company is selling a medical device, say an insulin device, once the sale happens, there's all these other services that need to happen," said Janice Bedsole, a spokeswoman for the company. Bedsole said OnProcess might arrange pick-up and delivery to the customer, handle customer support or take care of the "reverse logistics" of returns.

"They manage and have people in call centers that are trained in all those post-sale processes," she said.

In another example, Bedsole said OnProcess might handle service calls for a cable company. This might include making arrangements with a technician to visit a home or business and making sure that person had any specialized equipment needed for the job.

Bedsole said communications (cable, broadband), medical and technology companies make up a large part of OnProcess Technology's clientele. The company provides services in 26 languages and has eight facilities, including its Massachusetts headquarters and branches in India and Bulgaria.

"Lots of companies are beginning to outsource that because it's not their core business," she said. "They want to focus on making a good product."

Bedsole said renovations will start immediately and the new facility will likely open at the end of June.

Monday's announcement ends a pregnant pause during which city officials were almost certain that OnProcess was coming but were reluctant to speak in advance of official word from the company.

Plans that normally might have been hatched behind closed doors were partially forced into the open when the city applied for $1.1 million in Community Development Block Grant funding on behalf of OnProcess in January. Peter DelGreco of the private nonprofit economic development group Maine & Company represented OnProcess for the application. At the time, city officials had much of the same information released on Monday and expected that a final decision hinged on the grant.

On March 11, the city was conditionally awarded $800,000 in CDBG grant funding for OnProcess. A week earlier, the company had held a job fair in Belfast. City officials scheduled an announcement for April 3 but cancelled when the time came and OnProcess had yet to make a public statement.

In the two months since, OnProcess representatives have kept quiet about the company's Belfast plans. City officials were left shrugging and saying they were pretty sure it was going to happen.

"It maybe took a little longer than we expected, but it's great that they can move forward with opening their shop," said Belfast Economic Development Director Thomas Kittredge.

Kittredge commended the work of Maine & Company the organization was instrumental in bringing another Boston-area company, athenahealth, to Belfast in 2008 and said the deal speaks well for the city in a time when attracting businesses is a challenge.

Gov. Paul LePage echoed a similar sentiment in a statement. He noted the growth of OnProcess over the past year and said the company "could have chosen anywhere in the world for an expansion."

"Its decision to start an operation in Maine is a testament to our ongoing commitment to become better partners with the private sector in attracting new investment and career opportunities for the Maine people," LePage said.

OnProcess will be holding a job fair in Belfast to interview for positions at the new facility on May 20 and 21 at the University of Maine Hutchinson Center.