01
Software & management systems
Admin panels, records, workflows, reports and integrations. Employee management, squads, demands, candidates and screening — whatever your operation needs.
Since 1996 · São Paulo · Brazil
Technology, products and digital operations end to end.
3n20 is an applied innovation lab — analysts, tech leads and developers since 1996. We build software, products from scratch (patent, production, shelf), full stores, Uber partnership for deliveries, social media management and enterprise integrations. Everything we have built so far is continuous learning for the next project.
Java · SpringNode.jsProducts & patentsUber · CorreiosSocial mediaCloudflareApplied AI
Real productsFrom prototype to patent, packaging and store
Uber partnershipDelivery integrated into e-commerce ops
Social mediaInstagram, TikTok, YouTube — content & ops
Apps & APIsPanels, workers, automation & integration
Technologies we use daily
Modern stack for management systems, e-commerce, banking integration and high-performance websites.
Back-end
Java · Spring Boot · NestJS · Node.js · TypeScript · Python · REST · GraphQL
Front-end
Angular · React · HTML5 · CSS3 · JavaScript · PWA · responsive
Data & messaging
PostgreSQL · MongoDB · Redis · Kafka · TypeORM · SQL
Cloud & DevOps
Cloudflare Workers · GitHub Actions · CI/CD · DNS · KV · APIs
Payments, store & logistics
PIX · Mercado Pago · Asaas · PayPal · Correios · Uber Direct partnership · Resend · marketplaces
Social media & content
Instagram · TikTok · YouTube · WhatsApp · embeds · editorial calendar · analytics
AI & automation
Chatbots · IBM Watson · generative AI · transactional email · analytics
Enterprise
Lotus Notes · SAP · Oracle · legacy integrations · agile squads
Physical product
Prototype · optics · packaging · INPI/PCT patent · supply chain
What we build with you
Seven service lines — software, products, stores, Uber logistics, social media and websites from R$ 799.90.
02
Custom e-commerce and sales platforms
A core 3n20 service: custom serverless e-commerce (Cloudflare Workers + KV/D1), ultra-fast load and infra cost near zero. Sensor Tattoo Fix is the live proof — same architecture, admin, checkout, shipping and payments. We also deliver curation (Capitão Fantástico) and trust platforms (Gobtween).
- Custom admin: products, categories, variants, prices, stock and orders
- Fluid checkout · Asaas, Mercado Pago, Stripe, PayPal
- Shipping + labels: Correios, Super Frete, Jadlog, Uber Direct/courier
- SEO, domain email, phased delivery, code 100% yours
03
Websites & landing pages
Professional presence, SEO, bilingual PT/EN, forms and WhatsApp. Catalog of 12 segment templates — from R$ 799.90; custom sites at R$ 999.90.
04
Integrations & enterprise
Agile squads, business PIX, account opening, portability, Kafka messaging, CI/CD and systems that cannot go down — large financial institutions experience.
05
AI, chatbots & automation
Chatbots, voicebots and cognitive flows (IBM Watson) evolved into applied generative AI — support, screening and operations without noise. Includes Harvey.ai, a web legal assistant at 3n20.com.br/harvey that organizes case PDFs and drafts Word/PDF filings.
06
Product creation & patents
From idea to shelf: prototype, engineering, optics, materials, INPI/PCT patent, packaging, brand, supply chain and digital go-to-market. Sensor Tattoo Fix came from this process — and feeds what we learn in software and operations.
07
Social media & digital presence
Management of Instagram, TikTok, YouTube and WhatsApp — planning, publishing, site embeds, editorial calendar and ops aligned with the store or launch. Content integrated into the funnel we already build.
Portfolio & cases
Own products, enterprise systems, stores and websites built for clients — a technology portfolio, not business consulting.
Product · patent · e-commerce
Sensor Tattoo Fix
Optical lens for smartwatches on tattooed skin — and the full store that sells the kit. Patent, production, checkout, admin, PIX/cards/PayPal, shipping and marketplaces. The case that shows the custom e-commerce 3n20 builds.
StoreAdminCheckoutML · Shopee · AmazonPayPal INT
E-commerce · ops · software
Sensor Tattoo Fix store
What clients see in the stack: responsive storefront, cart, checkout, customer area, admin panel, Workers/KV, labels, shipping, orders, email and analytics — software 3n20 replicates to order.
E-commerce offerCuration · e-commerce · 3n20
Capitão Fantástico
Curated store we built for buyers who want a filter, not an endless catalog or anonymous dropshipping. The Captain tests and approves only products that truly solve a problem. Tracked delivery, clear warranty and 3n20 (CNPJ) support, with PIX and card via Mercado Pago. Same commerce stack as Sensor Tattoo Fix — different purpose: trust before volume.
CurationApproved sealDeliveryWarrantyPIX · card
View store
Platform · escrow · 3n20
Gobtween
The Trusted Go-Between — optional escrow layer: the buyer pays, funds stay in the vault until delivery or confirmation; then we release to the seller — or refund if the dispute goes the buyer's way. Marketing site, API, mobile app and dispute panel. Reuses the validated Sensor Tattoo Fix stack (payments, webhooks, admin) and adds hold/release. A 3n20 product.
VaultHold · releaseDisputeAPI · embedMobile app
View platform
App · mobility · 3n20
Radares
Travel app with speed-camera alerts along the route: set your path, get warnings on the way, and finish with a report of cameras you passed above the limit. HTTPS web pilot for phone testing — a 3n20 product, separate from Sensor Tattoo Fix.
RouteAlertsReportWeb · mobilePoC
View project
AI · legal · 3n20
Harvey.ai
Local legal assistant (formerly “Assistente Jurídico”) for Windows and Mac: organizes labor-law case PDFs, drafts Word and PDF filings, and keeps per-case learning. Runs in the browser on your machine — no mandatory cloud — with free Groq or optional Gemini/OpenAI.
PDF · OCRWord filingsGroqLocalLabor law
Open Harvey.ai
Management · enterprise
Squad management system
NestJS + Angular + PostgreSQL panel for professionals across every tech profile — squad intake, screening, HR and coordination at enterprise scale.
- DemandsSquad intake, grade, profile and status
- ProfessionalsEvery tech profile — dossier, screening and approval
- UsersProfiles, authentication and settings
- EmailAutomatic notifications for HR and coordinators
Websites · 12 segments
3n20 template catalog
Auto shops, healthcare, legal, food, gyms and more — from R$ 799.90, live within 48 hours after the brief is approved.
View catalogLanding · client
Recupera Tributos
Landing page, SEO and lead capture form we built for a tax credit recovery company. 3n20 delivers the technology; tax analysis is the client's business.
Website · client · sports
ES Sports Consulting
Bilingual website, service pages and lead capture we built for a sports consulting firm. Technology and digital presence — athlete advisory is the client's service, not 3n20's.
Website · client · health
Bruna Bononi
Professional website for dentist Bruna Bononi: profile, specialties, WhatsApp and booking. 3n20 delivers the digital presence; clinical care stays with the dentist.
View siteOperations · timesheets
Hours comparison
Local timesheet check: cross-matches allocations, Jira/Tempo worklogs and the CertPoint export, deducts lunch on weekdays and flags gaps over one hour. Each run is stored for operations.
Jira · TempoCertPointAllocationsVariance
AI · legal · 3n20
xThemis
3n20 Legal Intelligence: reads case PDFs and drafts Word and PDF filings. Our own product, live on its domain — the legal AI 3n20 builds and runs.
PDFWord filingsAIPT · EN
View xThemis
Professional websites
12 templates ready to customize
Pick a layout, we adapt your brand, copy and WhatsApp. Delivery within 48 hours — ideal for local businesses, clinics and offices.
Templates from R$ 799.90 · custom R$ 999.90 · delivery within 48 hours
Demo
Visual demo · content and identity are customized in the real project.
How we work
Every delivery — software, product, store, Uber or social — becomes learning for the next. Validate, build, operate and evolve.
01 — Understand
Problem & scope
Initial call, requirements, timeline and budget. No empty jargon: what needs to work on Monday.
02 — Build
Iterative development
Code, integrations, tests and deploy. Each project adds to our playbook — AI, APIs, logistics, physical product or social media.
03 — Protect & patent
IP when it matters
For inventions and physical products: technical drawings, reports, INPI/PCT filing and protection strategy — as with Sensor Tattoo Fix.
04 — Operate
Delivery & support
Launch, team onboarding, monitoring and evolution. A store that sells, a system the team uses, a site that converts.
Featured case · e-commerce
Sensor Tattoo Fix — product + full store
Live proof of the custom e-commerce 3n20 builds: not just the lens — the digital operation that sells the kit.
Millions of tattooed people get inaccurate heart rate and workout readings on smartwatches. We built the optical lens (patent), production and the full e-commerce — storefront, checkout, admin, payments, shipping and six sales channels. The software a client glances at and recognizes: “this is what 3n20 delivers in an online store”.
- EngineeringOptics, materials, 30+ models
- StoreCheckout, cart, customer area
- AdminProducts, prices, stock, orders
- PaymentsPIX, cards, international PayPal
- LogisticsCorreios, Uber Direct, INT shipping
- InfraWorkers + KV, low operating cost
FAQ
Does 3n20 offer sports or business consulting?
No. We are a software house: websites, stores, systems, APIs, apps and patented products (such as wearables). When sports or tax segments appear in the portfolio, that is technology we built for clients — not a consulting service 3n20 provides.
Does 3n20 only make the Sensor Tattoo Fix lens?
No. 3n20 is a software house — management systems, online stores, websites, integrations and AI. Sensor Tattoo Fix is one portfolio product: we developed the optical lens, patent, digital operations and store, but that is only part of what we do.
Do you manage social media?
Yes — planning, publishing and operations for Instagram, TikTok, YouTube and WhatsApp, integrated with the website or store we build. Content, embeds, calendar and analytics are part of digital operations.
Can you build a full online store for my business?
Yes — custom e-commerce: storefront, checkout, admin, PIX/cards, shipping (Correios, Super Frete, Jadlog, Uber Direct), SEO, domain email and code 100% yours. Stack validated on the Sensor Tattoo Fix store. Details and quote at 3n20.com.br/en/ecommerce.
What about the R$ 799.90 template websites?
Yes. Pick one of 12 catalog models — we customize your brand, copy and WhatsApp and publish. From R$ 799.90.
How long for R$ 999.90 websites?
Up to 48 hours after the brief is approved and materials are sent (logo, copy and photos). May vary with revisions and content volume.
Do you build internal management systems?
Yes — records, workflows, panels, reports and integrations. Experience with squad systems, HR and enterprise operations.
Let's build something together?
Custom e-commerce, website, product, social media or a new system — initial chat with no commitment.
Contact
Tell us what you need — we reply within a few hours.