// software studio — ai · saas · erp · mobile
Software built like a fortress.
Binary Castle designs and ships AI agents, SaaS platforms, ERP systems, and native mobile apps — end to end, with the stack that fits your problem.
// what we build
One studio, every layer of your product.
Strategy, design, engineering, and operations — a senior team that takes products from first commit to production and beyond.
AI Agents
Production-grade agents wired into your data and tools: automation, copilots, and workflows that hold up outside the demo.
SaaS Products
From idea to recurring revenue: multi-tenant architecture, billing, onboarding, analytics — the whole platform, engineered to scale.
Custom Software
Purpose-built products shaped around your workflows, not the other way round. We own delivery from first wireframe to production.
ERP Systems
Inventory, finance, HR, and operations unified in one system your team actually enjoys using — integrated with the tools you already run.
Mobile Apps
Truly native with SwiftUI and Jetpack Compose, or cross-platform with Flutter and React Native — we pick what serves the product best.
Open Source
We maintain and contribute to open source across the Flutter and Django ecosystems — the same craft we bring to client work.
// selected work
Proof, not promises.
Field Services · 14 weeks to launch
A field-service SaaS from zero to paying teams
We took a founder's validated idea for field-team scheduling and built the multi-tenant platform, mobile app, and billing — from first wireframe to first paying customer.
14 wks
idea to paying customers
Manufacturing · 9 months, module by module
Replacing spreadsheet chaos with a custom ERP
A manufacturer running production, inventory, and purchasing across dozens of spreadsheets got a unified ERP — rolled out one module at a time without stopping the factory floor.
hours
month-end close, down from days
Consumer / Logistics · 16 weeks to both stores
A native consumer app built for platform feel
A consumer brand whose cross-platform app was bleeding ratings got fully native iOS and Android apps — SwiftUI and Jetpack Compose — with live order tracking that feels like the platform it runs on.
2×
native apps, one shared design system
// the stack
Right tool, every time.
We're polyglot by design. Your product gets the technology that fits its constraints — performance, timeline, team, and budget.
Agents that plug into your real data, tools, and workflows.
Claude & frontier models
Tool use & multi-step reasoning
Grounded in your knowledge
Production-safe behavior
// open source
We build in the open.
Our engineers maintain and contribute to open source packages across the Flutter and Django ecosystems. It keeps our craft sharp — and it means the code we write for you follows the same standards the community holds us to.
Find us on GitHub$ flutter pub add our_packages
Resolving dependencies... done.
$ pip install our-django-tools
Successfully installed ✓
$ git shortlog -sn
Contributions across Flutter, Django & more
— shipped with care, maintained for the long run▊
// how we work
A process that ships.
Discover
We dig into your business, users, and constraints before a single line of code — so we build the right thing, not just a thing.
Design
Architecture and interface take shape together: system design, data models, and prototypes you can click through and react to.
Build
Short cycles, working software every week, and honest demos. You see progress in the product, not in slide decks.
Ship
CI/CD, observability, and a launch plan. We treat go-live as an engineering discipline, not a leap of faith.
Evolve
Products are never done. We stay on for iteration, scaling, and support — your long-term engineering partner.
// from the blog
Notes from the workshop.
Aug 6, 2026 · 2 min read
Native, Flutter, or React Native: how we actually choose in 2026
The mobile stack decision framework we use with clients — when SwiftUI and Jetpack Compose are worth two codebases, and when cross-platform wins.
Jul 30, 2026 · 3 min read
What building a custom ERP really takes (and when you shouldn't)
Custom ERPs fail for predictable reasons. Here's what the successful projects have in common — and the cases where off-the-shelf is honestly the right call.
Jul 22, 2026 · 3 min read
Shipping AI agents to production: what survives contact with real users
Most AI agent projects die between the demo and the deployment. The engineering practices that get them across — evals, guardrails, tool design, and cost control.
// let's talk
Have a product in mind?
Let's build your castle.
Tell us what you're building. We'll come back within one business day with honest thoughts on scope, stack, and timeline.