We'll build & launch your mobile app in 6-10 weeks using Flutter

If we don't build it in time, you pay only half and we work for free until we launch it.

Some of our clients

You may be struggling with...

Slow Development Time

Many startups struggle with development agencies that lack a streamlined process, resulting in prolonged timelines and delayed market entry.

Lack of Personalized Attention

Startups often find themselves treated as just another project in the queue, lacking the focused and customized approach they need for their unique app vision.

Technical Challenges

Navigating the complexities of building a cross-platform app that is both scalable and high-quality can be daunting for startups without the right technical expertise.

Why choose us

Expertise in Flutter Development

Many startups struggle with development agencies that lack a streamlined process, resulting in prolonged timelines and delayed market entry.

Guaranteed Timelines with Risk Reversal

We promise to launch your mobile app in 6 to 10 weeks. If we exceed this timeframe, you pay only half, and we continue working for free until launch.

Partner-Focused Approach

Unlike typical development agencies, We view each project as a partnership, ensuring your vision is perfectly translated into the final product.

Proven Track Record

With successful projects across diverse sectors, from luxury travel apps to practical solutions for real estate businesses, our work consistently drives user engagement and business growth.

Words from a recent client

How we'll build and launch your mobile app in 6-10 weeks

Discovery

During the Discovery Stage, we map out your software and decide together which features should be included in your Version 1 Launch.

UI / UX Design

This is where your app starts to come to life! First, we create flowcharts for every user type. Then, we begin designing all pages of the app.

Coding

We'll build your app following our plan. Each week, you'll receive a deliverable showcasing the progress, along with reports detailing what's been completed, what's in progress, and if there are any issues.

Discovery

During the Discovery Stage, we map out your software and decide together which features should be included in your Version 1 Launch.

Version 1 Launch

Here we go! Now it's time to release Version 1 of your app to the public. If it's a mobile app, then we will submit it to Apple and Google for review. Usually, there's some back and forth with them before they approve the app, and then it's available worldwide for download.

Maintenance and Upgrades

Now that your app is live, we will host and maintain everything you need. You can count on us to handle any bugs, develop Version 2 features, and ensure your users have exactly what they need.

What´s Included

Initial Consultation

Many startups Upgrades deep dive into your startup's needs and goals to tailor the app's features and functionality.

Custom App Design and Development

A complete design-to-development service using Flutter and Figma, ensuring a high-quality, scalable app.

User Feedback Integration

Post-launch, We'll assist in iterating the app based on user feedback to continually improve the user experience.

Clear Communication

Regular updates and open lines of communication throughout the development process.

Take a look at some of our case studies

Ras Transport's Mobile App for Streamlined Freight Management

Ras Transport, a freight transportation company, identified a need for a mobile app integrated with their Odoo ERP system to better manage their drivers' work. This integration aimed to reduce data loss and redundancy.

Medical Clinic Custom Mobile App

Dr. Shannon Mackey, an experienced solo practitioner at a family medical clinic, had previously used various medical software systems.
Despite these, he struggled with time-consuming administrative tasks, especially in document management.

Mytra Control Industrial Automation App

Mytra Control, specializing in industrial automation, partnered with us to develop a mobile app for a client project.
They needed an app integrated with IoT technology for efficient job management and data measurement.

Luxury Travel Mobile App

Odyssey Travel App, catering to the luxury travel sector, faced several challenges despite being established in the market.
Hindered by poor UI/UX design, bad coding practices, and critical bugs (including a six-month-long issue with travel bookings), the app struggled to be profitable.

Our Tools

We specialize in these tools because we prioritize building high-quality products and we want to do it efficiently. By focusing in only this set of tools, we've been able to build our own codebases which allows us to plug-and-play commonly used features when we start new projects.

Meet Our Founder

Santiago De Los Santos

Founder and Head of Development @ ProxiNexus

In my career, I’ve specialized only in building mobile apps. I started building native Android apps, until I discovered the power of Flutter, and how I could build apps for both Android and iOS with the same codebase. I’ve worked with software agencies, non-tech businesses and startups. I’ve done it all, built apps from scratch by myself, worked in large teams, maintained apps, and rescued projects from bad dev teams.

Connect with me on LinkedIn or send me a DM

Meet Our Founder

What our clients say about us

"Santiago understood very well and very quickly the business specifics and needs. His communication was always on time and proactive. We look forward to continue to work with Santiago on future project.“

Felipe Ferreira

Founder of ProyectaSoft

"Santiago was extremely professional and transparent, working with him was really enjoyable. On top of delivering the milestones within the forecasted timeline, Santiago provided us with extremely valuable feedback and insightful guidance to help us achieve our objective.“

Gatien De Callatay

Mine Mid-Range Planner at Centerra

"Santiago helped me turn a vague idea into reality. He understood very well my though process and how I wanted the final product to look like. He helped me shape the idea by providing a different point of view and alternatives to the hurdles we encountered throughout the development process. He was also able to clearly provide expectations for the work to be done, how long it would take, and therefore how much it would cost. Santiago was always available, I was able to communicate with him at will, and he is very easy to get along with. I look forward to work again with Santiago, and I would recommend him 100%.”

Jose Pirro

CFO at Star5 Creative

"Great communication, always meets deadlines, and writes great code. I had a Flutter app and Santiago was able to jump right in and improve the app dramatically. Highly recommend his services!”

Thomas Torbik

CEO at Apptat

"...entrusting our app's redesign to ProxiNexus was one of the best decisions we've made. Their technical prowess, combined with a keen understanding of user experience, has given our travel app the edge it needs in today's competitive market. If you're looking for a developer who embodies excellence and innovation, look no further than ProxiNexus. Here's to future collaborations!"

Stephen Scott

CEO at Travel Hub 365

“We had a really good experience working with Santiago. He was communicative, and quick to respond both to our questions and with clarifications on the requirements. The project was completed on time and to our satisfaction. The code was also designed and structured very well, making it easy to understand and follow. We would hire Santiago again for our future project needs.”

Glenn D'Mello

VP of Engineering at Ciclo Tech

"Santiago is a very solid Mobile Developer. He is very responsible, great at solving complex problems and has top notch communication skills.”

Martín Zuñiga

CEO at Hattrick IT

"Santiago gave us the requested work in time and form and was even able to improve the initial design, finding small flaws that had not been taken into account and that, thanks to his experience, could be solved without any problem. The communication with him has been fluid at all times, during the development and then the tests until the final result was validated. It was a pleasure working with him.”

Neus Morro Botía

COO at Mytra Control

"I found Santiago to be a skilled and professional developer. He takes an active interest in his work, is a good communicator, and is efficient and solution-oriented. I am thoroughly satisfied with the work he has done for my company and would recommend him to others.“

Shannon Mackey

Founder of OurGP Clinic

Some questions you may have...

Flutter allows for rapid development of visually appealing, natively compiled applications for both mobile and web from a single codebase. This means faster development, lower costs, and a consistent user experience across platforms.

Absolutely! We provide a comprehensive service that includes both the design in Figma and development in Flutter, ensuring a seamless and cohesive process from concept to launch.

We offer ongoing support and maintenance services to ensure your app remains up-to-date and continues to meet your users' needs effectively.

Yes, we can work with your backend team and integrate the mobile app to your current system.

Our prices typically range between $7,000 and $12,000 (USD), although it depends on the app you want to build. We don't work with budgets under $4,000.

Let's have a meeting to talk about your project

We'll send you a free quote for your project + a free prototype of your app

Book a Free 30-Min Consultation via Zoom

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Ras Transport's Mobile App for Streamlined Freight Management

Ras Transport, a freight transportation company, identified a need for a mobile app integrated with their Odoo ERP system to better manage their drivers' work. This integration aimed to reduce data loss and redundancy.
By using the app as a centralized platform for tracking all drivers' activities, Ras Transport established a single source of truth. This strategic move significantly reduced financial discrepancies, preventing revenue loss due to incorrect or lost invoices.

Medical Clinic Custom Mobile App

Dr. Shannon Mackey, an experienced solo practitioner at a family medical clinic, had previously used various medical software systems.
Despite these, he struggled with time-consuming administrative tasks, especially in document management.
To address this, we partnered with Dr. Mackey to create a custom mobile app. This app streamlined appointment scheduling, document management, and patient information handling. Its standout feature was the automated document creation and filling process, reducing a 5-minute task to a simple click. This enhancement significantly freed up Dr. Mackey's time, allowing him to take on more clients.

Mytra Control Industrial Automation App

Mytra Control, specializing in industrial automation, partnered with us to develop a mobile app for a client project.
They needed an app integrated with IoT technology for efficient job management and data measurement.
The app we built automates data collection and report generation, simplifying their client's invoicing process.

Luxury Travel Mobile App

Odyssey Travel App, catering to the luxury travel sector, faced several challenges despite being established in the market.
Hindered by poor UI/UX design, bad coding practices, and critical bugs (including a six-month-long issue with travel bookings), the app struggled to be profitable.
Recognizing the need for expert intervention, they partnered with us for a turnaround. Our collaboration focused on a UI/UX redesign tailored to the luxury travel market, prioritizing intuitiveness and aesthetics. Alongside this, we tackled the existing bugs and overhauled the codebase, laying a robust foundation for future feature enhancements and ensuring a seamless user experience.