We build dependable software for mobile, desktop and the cloud.
Castleworks designs, develops and licenses software products, and partners with companies to build custom applications from first prototype to production.
Engineering for teams that need it done right
Our founders bring more than 20 years of experience building software at global technology companies. We put that experience to work on your product.
Mobile apps
Native-quality iOS and Android applications, from design and development through App Store and Google Play release.
Desktop applications
Fast, efficient macOS and cross-platform desktop software built with Go and modern web UI frameworks.
Cloud & backend
APIs, distributed services and edge deployments that scale, with observability and security built in from day one.
AI integration
Practical use of large language models and speech recognition: transcription, assistants and intelligent automation.
Software licensing
Ready-made software products licensed to businesses and individuals, with ongoing updates and support.
Technical consulting
Architecture reviews, performance work and hands-on help for engineering teams facing hard problems.
Software we make and maintain
Alongside client work, Castleworks builds its own products focused on productivity and developer experience.
UnLoad Notes
A voice note app that lets you capture thoughts the moment you have them: just speak, and UnLoad turns it into organized, searchable notes.
- One-tap voice capture
- Automatic transcription
- Sign-in and sync across devices
Meeting transcription for Mac
A private, on-device meeting recorder that captures system and microphone audio, with no bot joining your calls, and produces accurate transcripts.
- Local processing on Apple silicon
- High-quality Brazilian Portuguese
- Works with any meeting app
Kubernetes log viewer
A lightweight desktop app for tailing and searching logs across Kubernetes pods and namespaces in real time.
- Multi-pod live tailing
- Fast filtering and search
- Native desktop performance
From idea to app store
Discover
We learn your goals, users and constraints, and agree on a clear scope and plan.
Prototype
A working prototype early, so decisions are made with real software in hand.
Build
Iterative delivery with tests, code review and continuous integration.
Ship & support
Store submission, deployment, monitoring and ongoing maintenance.
A small studio with deep experience
Castleworks Ltda was founded in 2026 in Olinda, Pernambuco, by Marcelo Lapa Cyreno and Adolpho Mafra Neto. Our work spans custom software development, the licensing of our own software products, and technical consulting.
We keep the team small and senior. Every project is handled directly by experienced engineers who care about reliability, privacy and craft.
- Company
- Castleworks Ltda
- Founded
- 2026
- Headquarters
- Olinda, PE, Brazil
- Focus
- Software development and licensing
- Platforms
- iOS, Android, macOS, web, cloud
Let's talk about your project
Tell us what you're building. We usually reply within one business day.
Office
Rua Prof. Francisco Xavier Paes Barreto, 234, Sala 106
Casa Caiada, Olinda – PE
53130-240, Brazil