Snap a list, get an order
A chef photographs a handwritten galley list, drops in a PDF or forwards an email. It comes back as a clean order with quantities and units.
"6 x milk, the oat one"Oat milk · 6 × 1 L
Design and engineering studio
Anyone can make software now. Making it simple is the hard part.
Argentera builds products with the reach of a big platform and the price of a small studio. Calm to use on the surface, quietly intelligent underneath.
Platform-scale software, priced like a studio.
The same building blocks the biggest apps run on, put together by a small senior team that cares how every screen feels.
Built to scale
Payments split across many sellers, native apps on both stores, background jobs that run every night. Ready for the day it takes off.
Priced like a studio
No layers of managers, no handoffs between agencies. The people you talk to are the people building it.
Simple on purpose
Designed for a tired crew member on a moving deck, not a demo on a big monitor. If it needs a manual, it isn't finished.
Quietly intelligent
AI that does the tedious work, so the screen can stay simple.
Every one of these is live in yuzu today. People never see a chatbot. They just notice the app already knows what they meant.
Quotes that price themselves
Each incoming line is matched against the seller's own price history, even when the wording differs, so most of a quote is filled in before they open it.
"Beef mince"Matched: Minced Beef, last priced 12 Oct
Support that answers itself
Good replies are saved, stripped of names and order numbers, and reused. A new ticket gets an instant answer only when a saved one fully fits, in the seller's own language.
"¿Cómo cambio mi horario de entrega?"Answered from the library, in Spanish
Paperwork, read for you
Upload a vessel registration or company certificate and the details fill themselves in while the file is still uploading.
registration.pdfVessel name, flag, IMO number
"Hey Siri, add to yuzu"
Crew add to the shopping list by voice, hands full, without opening the app.
"Two cases of sparkling water"Added to Monday's list
One voice, every language
Screens and emails are translated through a single brand-voice guide, so the product sounds like itself in French, Italian and Spanish.
"Your order is on its way""Votre commande est en route"
The same building blocks, pointed at your problem.
Reading invoices and receipts
Sorting a busy inbox
Product photography on demand
Drafting quotes and proposals
Catalogues imported from a PDF
Search that understands what people mean
Selected work
Three products we designed and built, live today.
yuzu
Superyacht crews ordered provisions through WhatsApp, PDFs and phone calls, and suppliers chased payment by hand. yuzu replaces all of it: a buyer store and native app, a seller portal, a driver app, an admin console, and quotes, invoices and delivery notes generated as PDFs.
- Payments straight to each seller, plus bank transfer and automatic credit notes
- AI that turns photos, PDFs and emails into orders and prices them
- 1,791 commits in seven months, fixes on phones the same day
villaFlow
Villa concierges in Tulum booked yoga and pilates teachers through scattered message threads, and nobody tracked commission. villaFlow lets concierges find an instructor by place and time, request a booking, and see what they've earned.
- Instructor profiles, prices and schedules, with clash handling
- Commission ledger, push notifications, add to home screen
- Empty repo to full product and redesign in three days
Gizmo
Habit apps are lonely, so people quit them. Gizmo puts a family's goals in one place and ties them to a shared pet that grows when you show up and gets sick when you don't.
- Family feed with reactions, comments and nudges
- A 52-week history grid styled as a retro screen
- Fair catch-up days, settled in each person's own time zone
How we work
01
Shape
A written plan and a design direction before a line of code. You know exactly what you're getting and what it costs.
02
Ship in slices
Something real in your hands every few days. No big reveal at the end, no surprises.
03
Run it
Monitoring, bug tracking and quick fixes after launch. Software is never just handed over.
Built with Next.js, React Native and Expo, TypeScript, Postgres, Stripe, Supabase, Vercel, Railway and Claude.
Got something to build?
Tell us what you're making and where you're stuck. We reply within [RESPONSE TIME].
[YOUR EMAIL] · [YOUR LOCATION]
- Role
- Product design and engineering
- Platforms
- iOS, Android and web
- Timeline
- April 2026 to now
- Built with
- Next.js, Expo, Hono, Postgres, Stripe, Claude
The problem
Yacht crews provision in a hurry, often in a port they've never been to. Orders went out over WhatsApp, emailed PDFs and phone calls. Suppliers retyped every list into a quote, then chased payment by hand, and nobody had one place to see what was ordered, approved, delivered or paid.
What we built
- A marketplace where crew browse local suppliers, build lists and order, on the web and in a native app
- A seller portal for catalogues, quotes, invoices and deliveries
- A driver app for proof of delivery, and an admin console to run the whole platform
- Quotes, pro formas, invoices and delivery notes generated as PDFs
- Card payments straight to each seller, bank transfer, and credit notes issued automatically when an issue is resolved
Decisions that made it simple
Approvals that match the boat
Only crew need sign-off. Heads of department and vessel admins order straight away, the way a yacht actually runs.
No passwords anywhere
Everyone signs in with a six-digit code by email. One less thing for rotating crew to forget.
Try it without risk
Demo sellers run on test payments with a clear notice, so a prospect can place a real-feeling order and nothing is charged.
AI where it saves typing
Photos, PDFs and forwarded emails become orders, and quotes fill in from each seller's own price history.
Fixes the same day
Small fixes reach phones over the air, without waiting for an app store review.
Next case study
villaFlow- Role
- Product design and engineering
- Platform
- Installable web app
- Timeline
- Three days, October 2026
- Built with
- Next.js, Drizzle, Postgres, Web Push
The problem
Concierges at Tulum's villas arrange yoga, pilates and boxing for their guests. That meant messaging a handful of instructors, waiting for replies and keeping track of commission in a notebook. Instructors had no simple way to show their prices or when they were free.
What we built
- Two sides in one app: concierges search and book, instructors manage their profile, prices, schedule and photos
- Search by villa address and time, with results the concierge can adjust without starting over
- Booking requests that instructors confirm, decline or cancel, with emails, push notifications and calendar invites
- A commission ledger, so concierges see what every class earned them
- An admin area where new instructors are approved before they can be booked
Decisions that made it simple
Always Tulum time
Every class time shows in Tulum's time zone, whatever the guest's phone is set to. Nobody misses a 7am class because they flew in from Madrid.
Clashes caught early
Requests check the instructor's schedule, so the same hour can't be booked twice.
A look of its own
Warm sand, terracotta and sage, with quiet motifs: doorway arches for villas, an ensō around the balance, a horizon over bookings.
No app store needed
It installs to the home screen and sends push notifications, so concierges can start the same day.
Next case study
Gizmo- Role
- Product design and engineering
- Platform
- Installable web app
- Timeline
- August to September 2026
- Built with
- Next.js, Supabase, Web Push
The problem
Habit trackers are solitary. Miss a few days and the streak, and the motivation, are gone. Families wanted to cheer each other on without a group chat full of nagging.
What we built
- A family space joined with an invite code, where everyone sets daily, weekly or effort-based goals
- A shared pet that hatches, grows with consistency and gets unwell when goals slip, and that another family member can revive
- A family feed with reactions, comments and gentle nudges
- A 52-week grid comparing everyone's consistency, styled like an old handheld screen
- Push notifications and an app that installs to the home screen
Decisions that made it simple
Fair catch-up
Goals count as missed until you log them, with a grace window to catch up on yesterday. One busy evening doesn't wreck a streak.
Days end where you live
Each person's day closes at their own midnight, so a family spread across time zones is treated fairly.
Partly done counts
Effort goals have a partly done state, because something is better than nothing.
No spoilers
Notifications never reveal the pet's final form. You find out by keeping your goals.
Private by default
Every record is locked to the family it belongs to, enforced by the database itself.
Next case study
yuzu