App development in Boston and across Massachusetts
Carvalho Karsten is an iPhone and Mac app studio with a commercial address on Cape Cod. It serves companies in Boston, on the Cape, in Providence and across New England. The work happens remotely, with video calls in your business hours.
This page explains how a local client works with the studio, and what you can and cannot expect. If you are on the Cape or the South Shore, the Hyannis line puts you in touch with a person who lives in the region.
Who you work with
Thiago Do Carmo, CEO. Thiago has lived on Cape Cod for 21 years. He runs six companies, including DockPlus AI, and is your US point of contact.
Gustavo Henrique Karsten, CTO. Gustavo is an engineer with more than 20 years in technology. He leads the architecture and code of each app.
The Swift team. The engineering team works remotely from Santa Catarina, Brazil. Brazil’s time zone (BRT, UTC−3) is 2 hours ahead of Boston in winter and 1 hour ahead during daylight saving time.
Address and phone. 207 Iyannough Rd, Hyannis, MA 02601. Phone +1 774-207-7924. Monday to Friday, 9 a.m. to 6 p.m. Carvalho Karsten has no office in Boston.
Mobile app development for Boston companies
Boston has large agencies that build web, Android, AI and iPhone apps under one roof. Carvalho Karsten does one thing: native apps for iPhone and Mac in Swift and SwiftUI.
That focus fits these projects:
- A first version (MVP) of an iPhone app for a startup or a new business line.
- A Mac app for an internal team or for sale on the Mac App Store.
- An existing iPhone app that needs a new developer, a rewrite in SwiftUI or regular iOS updates.
- An app built with an AI tool such as Lovable, Cursor, Rork or Bolt that needs to pass Apple’s review.
If you need Android at launch, a cross-platform studio is a better fit. The native vs cross-platform guide explains when.
What app development costs in Massachusetts
Prices vary widely among Boston-area studios. Rocket Farm Studios, in Needham, publishes a 12 to 16 week build at $250,000 to $500,000 and a 3-week prototype at $15,000 to $25,000.
As a market reference, a native iPhone MVP from a US-market studio usually costs $50,000 to $100,000. Carvalho Karsten sets your price after the project review, which lists the development stages, integrations and changes your app needs. Proposals and contracts are in USD. The app development cost guide explains what moves the number.
How a project with a Massachusetts client works
- Project review. A video call in your hours, Eastern Time. The team maps screens, integrations and risks.
- Proposal. Scope, price in USD and schedule, in writing.
- Development with TestFlight. You install each new build on your iPhone through TestFlight and comment on it.
- App Store submission. The team submits the app on your Apple Developer account and handles Apple’s review.
- Maintenance. Bug fixes and updates for each new iOS version.
In the market, a first version usually takes 3 to 4 months. The how Carvalho Karsten works page explains each step.
Questions to ask any Boston app developer
Use these questions to compare Carvalho Karsten with any studio in the Boston area:
- Which platforms do you build? A studio that builds everything may not go deep on iPhone.
- Where does the team work? Ask whether developers are in the office, remote or subcontracted.
- Whose Apple account is the app on? It should be yours.
- Who handles Apple’s review? Rejections are common, and someone must answer them.
- What does maintenance cost? Apple releases a new iOS every year, and your app must keep up.
Ask for the answers in writing, inside the proposal.
Remote team, local accountability
The commercial address and US phone line give you a contact in Massachusetts during your business hours. The time zone keeps your questions and the team’s answers on the same day. For more on this model, read about nearshore app development.
Next step
Call +1 774-207-7924 or send a short description of your app. The reply brings the next steps and the date of your project review.