Mobile apps
High-performance iOS and Android apps with React Native and Expo, with native-grade polish and fluidity — from prototype to the app stores.
Software engineering studioHigh-performance
High-performance
digital products.
Fast, scalable mobile, web, and desktop apps — from first prototype to operation at scale. Engineering that has shipped products used across the US, Europe, and the UAE, in healthcare, e-commerce, AI, and esports.
Products our code runs in — used by millions
Gopuff
E-commerce · US
dubizzle
Marketplace · UAE
Riot Games
Games · via Znipe.tv
ESL
Esports · via Znipe.tv
DreamHack
Esports · via Znipe.tv
Goodword
AI · Networking
Engineering work on products that scaled globally
Stack
Mobile
- React Native
- Expo
- Reanimated
- Nitro Modules
Native
- Swift
- Kotlin
- C++ / JSI
Web
- Next.js
- React
- TypeScript
- TanStack
- Node.js
Desktop & data
- Electron
- Tauri
- PostgreSQL
- NoSQL
What we do
End-to-end engineering, on any platform.
From first prototype to operation at scale. A team that knows the stack inside out — and delivers as if the product were ours.
Web applications
Modern platforms and dashboards with Next.js and React: fast, accessible, SEO-optimized, and ready to scale.
Desktop apps
Applications for Windows, macOS, and Linux from the same codebase, integrating native capabilities when the product demands it.
Performance & native modules
Startup time, 120fps animations, and custom native modules (JSI/Nitro) to make existing apps genuinely fast.
AI & data
LLM integration, on-device AI, and data-intensive products — with reliable pipelines and offline support when needed.
Consulting & code review
Technical audits, architecture, and mentoring with React Native, web, and native specialists to unblock your team.
Work
Apps we helped build.
Real products, published in the stores and used every day — from AI and healthcare startups to large-scale operations in the US. Mobile engineering from concept to the App Store.
Featured project
Goodword
RelateAI · AI · Networking
AI networking copilot that syncs contacts, suggests the right connections, and generates actions at the right moment.
What we delivered
Mobile development of the product in React Native, with AI integrations and a fluid interface.
React NativeAIiOS · Android
Post Op
Post Op Ltd · Healthcare · Post-op care
Digital post-operative care service with insights, wound images, and continuous clinician-patient interaction.
What we delivered
Engineering of the patient app — image capture, clinical data, and secure communication.
React NativeHealthcareImaging
PO Clinician
Post Op Ltd · Healthcare · Clinical teams
App for healthcare teams to manage patients' post-operative care from anywhere.
What we delivered
Built the clinician app, with workflows and data in a responsive mobile experience.
React NativeHealthcareSecurity
Gopuff
Gopuff · E-commerce · Delivery
Instant delivery of thousands of items — groceries, drinks, and more — in minutes.
What we delivered
Feature and performance engineering on a large-scale e-commerce app in the US.
React NativeE-commerceScale
Gopuff Driver
Gopuff · Logistics · Drivers
Driver app: pickup of ready orders at hubs and fast deliveries, without complicated routes.
What we delivered
Development of the driver app — pickup flows, maps, and field operations.
React NativeLogisticsMaps
Triggy Live Score
Triggy AB · Betting · Live score
White-label live score and betting apps for major operators — real-time scores and odds, with push-driven conversion.
What we delivered
Engineering of the iOS and Android mobile apps: live scores, odds widgets, multi-language, and dynamic content.
React NativeLive scoreiOS · Android
Web projects
Web platforms in production.
dubizzle.com
dubizzle
Marketplace · UAE
The #1 classifieds marketplace in the UAE — real estate, cars, jobs, and more, with millions of users.
WebMarketplaceScale
znipe.tv
Znipe.tv
Streaming · Esports
Esports streaming with synchronized multi-POV, real-time stats, and monetization — used by Riot Games, ESL, and DreamHack.
WebStreamingReal time
medify.co
Medify
Edtech · Healthcare
Leading medical admissions prep platform (UCAT, GAMSAT, interviews) — used by 250k+ students.
WebEdtechPlatform
We also create and maintain open-source libraries used by apps around the world.
nitro-markdownnitro-authnitro-storagenitro-qrcodecalendar-ui
Proof, not promise
Engineering you can verify.
No claims without evidence. WebNexus's track record is published in the stores, in open source, and in the markets where it has run.
Published apps
iOS and Android in the stores — Goodword, Post Op, PO Clinician, Gopuff, and more
US · Europe · UAE
Products in production across three markets, with millions of users
Active open source
Libraries in the React Native ecosystem, used by apps around the world
Production code
Typed, testable, and maintainable — not a fragile prototype disguised as a deliverable
Where we've delivered
Engineering that works in any industry.
The same quality bar across products already live — from clinical apps to marketplaces with millions of users. If your product demands real performance, this is our terrain.
01
Healthcare & digital health
Clinical and patient apps with sensitive data, image capture, and secure communication. Including post-op care and remote monitoring.
ProvaPost Op · PO Clinician · Medify
02
E-commerce & logistics
High-volume apps with checkout, catalog, and field operations. Performance at scale and a fluid experience under load.
ProvaGopuff · Gopuff Driver
03
AI & consumer products
LLM integration, copilots, and consumer products with on-device AI. From prototype to the app stores.
ProvaGoodword
04
Streaming, games & media
Platforms with multi-POV video, real-time data, and monetization — used by major esports brands.
ProvaZnipe.tv · Triggy
05
Marketplaces & classifieds
Web platforms with millions of users, search, listings, and transaction flows at scale.
Provadubizzle
06
Your industry
Not on the list? What matters is the technical bar, not the label. If the product needs real engineering, let's talk.
ProvaTailor-made
How we deliver
A transparent process, from briefing to go-live.
01
Discovery
We understand the product, business goals, and technical constraints before any line of code.
02
Architecture & design
We define the technical foundation and the user experience, ensuring scale and quality from the start.
03
Engineering
Iterative development with frequent deliveries, tests, and production quality in every release.
04
Launch & evolution
Publication, monitoring, and continuous optimization after the product goes live.
Principles
Standards we don't compromise on.
01
Performance is not optional
Every interaction should feel instant. We optimize rendering, memory, and startup as a priority, not a detail.
02
Transparent communication
Open process, frequent deliveries, and full visibility of progress. No black box.
03
Production code, always
No fragile prototypes disguised as deliverables. We write testable, typed, maintainable code.
04
Open source in our DNA
We live in the ecosystem and maintain tools used by teams worldwide. Engineering exposed to daylight.
How we work
Clear engagement models.
Projects from ~4 weeks. Pick the format that fits your moment — and we scale as the product grows.
Sprint / fixed scope
For a well-defined feature or MVP: scope, timeline, and price locked before we start. Ideal to validate an idea or ship the first version.
Ideal paraMVPs and isolated features
Dedicated / continuous sprints
Engineering allocated in cycles, with frequent deliveries and priorities adjusted every week. Ideal for products in continuous evolution.
Ideal paraGrowing products and long roadmaps
Consulting & code review
Technical audits, architecture, and targeted mentoring to unblock your team. Ideal when you need a specialist, not a whole team.
Ideal paraTeams that need technical direction
NDA-ready. The code and the IP are yours.English and Portuguese, in your time zone.
Who's behind it
Engineering led by the person who writes the code.
WebNexus is a studio led by João Paulo Marra, a software engineer with a track record in mobile products used across the US, Europe, and the UAE. Larger projects draw on a network of trusted partners — always with the same quality bar.
João Paulo Marra
Software engineer · Founder
Years of mobile engineering on internationally scaled products, from instant delivery in the US to esports streaming for Riot Games, ESL, and DreamHack. Maintains open-source libraries in the React Native ecosystem and applies that experience to products in any industry.
Technical leadership that writes the code — not a manager who delegates
Trusted partners to scale, with the same quality bar
Open source in the React Native ecosystem, exposed to daylight
- Markets we operate in
- BR · US · EU · UAE
- Platforms delivered
- Mobile · Web · Desktop
Frequently asked questions
What we usually get asked.
01
Do you work with existing apps and systems?
Yes. We take on projects at any stage — from an idea on paper to a production product that needs performance, new features, or modernization.
02
Which platforms do you cover?
Mobile (iOS and Android), web, and desktop. We use React Native, Expo, Next.js, and React, with Swift, Kotlin, and C++ when native matters.
03
Do you serve any industry?
Yes. We've delivered in healthcare, e-commerce, AI, esports, and marketplaces — but what defines the fit is the product's technical bar, not the industry. If it needs real engineering, we're in.
04
How does the team work?
WebNexus is led by João Paulo Marra, an engineer who writes the code. Larger projects draw on a network of trusted partners, always with the same quality bar.
05
How do we start a project?
Send a message through the form with a summary of what you need. We reply with next steps and a scope proposal.
Let's talk
Let's build something excellent.
Tell us about your product. We reply fast — usually within one business day.
NDA-ready. The code and the IP are yours.English and Portuguese, in your time zone.