From design to a live app.
Douglas Dias researches and designs. Thiago Felipe codes the app, the web and the API. You talk directly to both, with no handoffs between teams.
9 years of product design and 6 of full stack and mobile development, across banking, retail, food service, telemedicine and SaaS.
Cases
What each of us did before dtxtech.
Four projects, two each: the problem, what was done and who did it.
- 01 / Product design · 2023–2024
Rural credit in clear flows for rural producers
Credit and loan journeys at a large bank for rural producers: dense business rules became clear flows, with product and engineering close by to ensure technical feasibility.
Read the case → - 02 / Front-end engineering · 2023–2025
Table orders straight from the waiter's POS terminal
A React Native app for waiters, embedded in POS terminals from different acquirers and banks: orders go from the table to the backoffice, which triggers preparation in the kitchen, and cards are paid on the terminal itself.
Read the case → - 03 / Product design · 2024–2026
SaaS redesign with research and generative AI
Redesign of SaaS platforms with an international team, focused on usability, scalability, and standardized flows: user research, generative AI prototypes, and business rules documented for delivery.
Read the case → - 04 / Full stack engineering · 2020–2023
End-to-end telemedicine with a WhatsApp CRM
End-to-end work on a telemedicine platform, from database to app: real-time video consultations, APIs for patients and doctors, and a CRM with WhatsApp support.
Read the case →
Services
Research, design and code in one place.
Hire one, two or all three.
Research and discovery
Before any screen, we understand the problem: interviews with users and stakeholders, field research and business rules documented with product and engineering.
- User and stakeholder interviews
- Field research
- Qualitative and quantitative research
- Documented business rules
Product design
Journeys, flows and high-fidelity interfaces for apps, SaaS platforms and financial systems, built on a design system and tested with users.
- Journeys and flows
- Wireframes and high fidelity
- Generative AI prototypes
- Usability testing
- Design system and components
Full stack and mobile development
React Native apps for iOS and Android, web in React and Next.js and the APIs behind them, focused on critical journeys: payments, cards, credit and authentication.
- iOS and Android apps
- Web in React and Next.js
- APIs and BFFs in Node.js and Java
- Payment and WhatsApp integrations
- Deploy on AWS and Azure DevOps
- Code with Claude Code, reviewed change by change
Studio
Two specialties. One flow.
You work directly with the people who research, design and code the product.
Douglas Dias
Specialist Product Designer · 9 years of experienceHe designed credit journeys, onboarding and back-office interfaces for large banks and redesigned SaaS platforms with an international team, using generative AI to prototype and validate ideas. He plans research and usability tests, in person and remote, and works close to engineering through delivery. He works in Portuguese and English.
- User research
- Usability testing
- Field research
- Journeys and flows
- Design systems
- Generative AI prototypes
- Financial products
- B2B and B2C
Thiago Felipe
Full Stack & Mobile Developer · 6 years of experienceHe builds from the app in the user's hand to the API behind the journey, with React Native, React, Next.js, TypeScript, Node.js and Java/Spring Boot. He has shipped bank slip and QR Code payments, biometrics, adding the card to Apple Wallet from the app and card transactions on POS terminals, in banking, retail, food service and telemedicine. He uses Claude Code across his whole workflow: he designs the solution, directs the agent and reviews every change before testing.
- React Native (iOS and Android)
- React and Next.js
- TypeScript
- Node.js and Express
- Java and Spring Boot
- MySQL
- Payments and cards
- WebRTC and WebSocket
- AWS and Docker
- Claude Code
Process
Understand before designing, test before building.
We don't jump straight to the interface. Research, collaboration and testing lower the risk before investing in code.
- 01context comes first
Discovery
We start with context: business rules, requirements and conversations with stakeholders and users to map pain points and opportunities.
- Business rules
- Interviews
- Field research
- 02think together, decide better
Co-creation
Product, design and technology in the same conversation, in co-creation sessions, to turn what research showed into journeys and flows.
- Co-creation sessions
- Journeys
- Flows
- 03evidence before code
Validation
Wireframes and prototypes, some made with generative AI, tested with users in person and remotely before they become code.
- Wireframes
- Prototypes
- Usability tests
- 04from prototype to live app
Build
App, web and APIs in the same team, with unit tests, feature flags and staging builds for QA. Design stays involved through delivery.
- App and web
- APIs and BFFs
- Deploy
- 05launch is the start
Evolution
After launch, metrics and feedback from the people using it point to the next improvement.
- Metrics
- Feedback
- Improvements
Any step can go back to the one before when new evidence shows up.
Articles
Notes from the people who design and code.
Short pieces on research, design and code, by Douglas and Thiago.
Contact
Let's build.
Tell us what you're building. Douglas or Thiago will reply with an honest opinion, even if the project isn't a fit for us.
Email the studiohello@dtxtech.studio