Castteli Technology
Engineering for what comes next.
Software, infrastructure and technology for systems that need to work.
TechnologyCloudSecurity
PositioningEngineering for software, infrastructure, security, the cloud and products. And for you.
Positioning
We don't build technology to look complex. We build it to work.
We design every system as infrastructure: to last, to be observed and to stay secure.
Precision before volume.
Who it's for
If you feel that:
Every deploy becomes an event.
Automated delivery, with separate environments and verification before publishing.
Nobody touches the system for fear of breaking it.
Typed, tested code, built to evolve without a rewrite.
Security only shows up after the incident.
Security treated as architecture, from the very first decision.
The business runs on spreadsheets and memory.
Systems built on your business rules, connected through APIs.
The website exists, but it doesn't work for the business.
Fast, accessible interfaces, designed for visitors to take action.
What we build
Disciplines of a single system.
Typed, tested web applications and backend systems, designed to evolve without a rewrite.
- Software engineering
- Systems architecture
- APIs and integrations
- Digital products
Separate environments, automated deployment and declarative configuration.
- Infrastructure and delivery
Payments
In developmentSoftware and integrations for payment flows. Technology, not the provision of financial services.
Authentication, authorization and validation treated as architecture, not as a fix.
- Security by design
- Supply chain
Continuous delivery and observability as part of the product, not as a final step.
- Observability
Products
In developmentOur own products, presented only when they are ready for public use.
Technology
Engineering that can be verified.
Explicit decisions, typed contracts and a pipeline that blocks regressions before any release.
- Security by design
- Validation at the edge, least privilege and secrets kept out of the code from the very first decision.
- CSP · Zod · gitleaks
- Typed systems
- Explicit contracts and types derived from a single source.
- TypeScript strict · Zod
- Automated tests
- Relevant logic covered by tests. The pipeline blocks regressions.
- Vitest · Playwright
- Accessibility
- Interfaces navigable by keyboard and screen reader, verified with every change.
- WCAG 2.2 AA · axe
- Performance
- Static rendering, minimal JavaScript and experience measured as a requirement.
- Core Web Vitals
- Observability
- Systems in production need to explain their own behavior.
- Logs · métricas · traces
Products
Our own products, when they are ready to be presented.
How we build
From understanding to continuous evolution.
Understand
The problem, the context and the constraints before any solution.
Design
Boundaries, contracts and recorded decisions.
Build
Typed, reviewable code that is simple to change.
Test
Automated tests and accessibility checks.
Release
Automated delivery, with separate environments.
Evolve
Observe the system in use and improve it from there.
Infrastructure
Structure before scale.
Layers with clear responsibilities and a single path to production, verified with every change.
Interface
Server-side rendering, minimal JavaScript.
Contracts
Input validated at the edge, types from a single source.
Services
Isolated domains, dependencies flowing in one direction.
Platform
Separate environments, secrets kept out of the code.
pnpm check
- lint
- typecheck
- test
- check:domains
- depcruise
- build
pnpm e2e
- playwright
- axe · WCAG 2.2 AA
ci
- gitleaks
- osv-scanner
- lighthouse
Any step that fails blocks the release.
How does a project with Castteli start?
Through the contact page: tell us the context and the problem. The conversation starts with engineering: understand first, then propose.
Go to contactWhat happens after I send a message?
The message reaches the responsible channel and the reply comes to the email address you provide. Sending a message does not create an account or any commercial commitment.
What practices and technologies do you use?
TypeScript in strict mode, data validation with Zod, automated tests with Vitest and Playwright, accessibility checks with axe and a pipeline that blocks regressions before publishing. These are the same practices behind this site.
Explore the technologyIs Castteli a payment institution?
No. Payments is technology for payments, meaning software and integrations, and it is being structured. Castteli does not provide financial services.
Do you already have your own products?
They are being structured and will be presented only when they are ready for public use.
Is the data I send stored on the site?
No. The site does not save messages in a database and does not use cookies. The message is forwarded to the support channel and used only to reply to you.
Privacy PolicyOrigin
A new identity for a new phase.
Castteli Technology represents the evolution of CarterDev into a broader identity, prepared for a new phase of products, technology and innovation.
Ready to build?
Let's turn complex problems into technology.
Tell us the context and the problem. The conversation starts with engineering.
Talk to Castteli