Expert AI Chat
Expert AI is a conversational platform that allows users to brainstorm, plan, and execute tasks within a single chat interface. Designed with a clean, user-friendly UI, it delivers practical assistance to streamline daily workflows
Custom Software Development Company
We're a client-focused software development company ensuring our customers' needs are met.
Cozy Kitchen
Cozy Kitchen is a mobile app designed to make meal planning and cooking easier for everyday users
Second Number
Call and text from anywhere on your device without a SIM card, using a private virtual number for personal or international communication
FF Poker
An app for keeping track of poker tournaments and finances
WeightLoss
An app with recipes and exercises where you can track your weight loss progress
SwopStore
SwopStore is a clean, modern corporate website that showcases services in a clear and engaging way
Vinsby
The wine cellar management application is an innovative solution based on the concept of a smart home
Up.You
A platform that connects people in need of psychological help with qualified professionals
Trust & Review Signal Platform
An AI-powered Google Business Profile assistant that helps local businesses build trust, respond to reviews, and climb to the top of Google Maps.
AI Chat — Your AI Assistant
A cross-platform AI chat app powered by GPT, with voice input, document analysis, image generation, and a full-featured web interface.
Swai AI Dance
Transform your still images into amazing AI dance videos with just one tap. No editing or dancing skills needed.
Synchron Time Tracker
AI-powered workspace for project management, time tracking, and team collaboration
Trusted by teams at4LogistClappsJoyteractiveSOAXVinsby
Our services
We build custom-designed mobile and web solutions tailored to your needs.
Mobile App Development
Create secure and intuitive mobile applications tailored to your goals. We specialize in cross-platform development with Flutter and native technologies for iOS and Android (Swift, Kotlin, SwiftUI). From concept to launch, our team ensures stable, scalable and user-centric apps.
Web Development
Launch engaging web solutions designed around your unique needs. We build responsive and secure platforms with strong backend architecture and polished front-end design. Anything from landing page to complex web app - we've got you covered.
UX/UI Design and Prototyping
Bring your concept to life with expert design and research. We help define product goals through discovery sessions, competitive analysis, and UX/UI strategy. Our team creates user-friendly interfaces that align with both user expectations and your business objectives.
Quality Assurance
We conduct thorough manual and automated testing to catch issues before they reach your users. Our QA process ensures each feature works as intended across all platforms and devices.
Backend Development
Power your digital products with scalable and reliable server-side solutions. Our backend development expertise covers Java, Python, and PHP enabling secure, high-performance systems, seamless third-party integrations, and robust data management.
Post Launch Support
Keep your product running smoothly after release with our dedicated support plans. We provide technical assistance and ongoing enhancements to ensure your application remains stable and user-friendly.
Technologies we work with
- Flutter
- Swift
- SwiftUI
- Kotlin
- React
- Node.js
- Java
- Python
- PHP
- PostgreSQL
- AWS
- Firebase
Who we build for
- Startups & founders
- Scale-ups
- Enterprise teams
- Product companies
- Agencies & white-label
Industries
Domain knowledge we bring to the table on day one.
Healthcare & WellnessUp.You, WeightLoss — HIPAA-aware data handlingFinTechPayments, KYC flows, PCI-aware architectureTelecomSecond Number — VoIP and virtual numberingE-commerce & RetailSwopStore — storefronts and catalogue systemsFood & HospitalityCozy Kitchen — planning and recommendation enginesAI & ProductivityExpert AI — LLM products and assistant interfaces
Problems we solve
The four reasons companies come to us.
“Our last agency shipped late and over budget.”
We scope in a paid discovery sprint before quoting, so the estimate is based on a real backlog rather than a guess. Scope changes go through a written change order — no silent overruns.
“We have an idea but no product team.”
You get designers, engineers and QA as one unit, with a single point of contact. We take the product from a first workshop through to a released app and its first iterations.
“We inherited a codebase nobody can maintain.”
We audit the existing code, document what it actually does, and give you a staged plan — stabilise first, refactor second, extend third — instead of a rewrite you can't afford.
“We need to show investors something real.”
A focused MVP with the metrics that matter instrumented from day one, plus the demo materials to present it. Several of our clients raised on the product we built.
How we work
Five stages, each one ending in something you can review.
- 01
Discovery
Workshops, competitor teardown and a prioritised backlog. Ends with a scope and a fixed quote.
- 02
Design
User flows, wireframes, then a clickable prototype in your brand. Ends with an approved UI kit.
- 03
Build
Two-week sprints with a demo at the end of each. Ends with a release candidate on TestFlight.
- 04
QA & launch
Manual and automated passes across devices, store submission and rollout. Ends live.
- 05
Support
Monitoring, fixes and a roadmap of enhancements. Ends when you say so.
Why companies choose RERO
Senior-only team
Every engineer on your project has shipped production apps before. No juniors billed at senior rates.
Fixed scope, fixed quote
We price after discovery, not before. Changes are agreed in writing before any work starts.
One team, whole product
Design, backend, mobile and QA sit together. Nothing gets lost in a hand-off between vendors.
You own everything
Code, designs, accounts and infrastructure are yours from the first commit. No lock-in.
Weekly demos
You see working software every sprint, not a status report. Course-correct while it's still cheap.
Time-zone overlap
At least four hours of overlap with US and EU working days, every day.
NDA on request
Happy to sign before we discuss any sensitive detail of your idea.
Support that continues
Dedicated post-launch plans, so release day is the middle of the project and not the end.
RERO in numbers
- 12
- years building mobile products
- 60+
- apps shipped to the App Store and Google Play
- 40
- designers, engineers and QA on staff
- 92%
- of clients come back for a second project
Certifications
Certified to the highest standards
ISO/IEC 27001
Information security management, audited annually.
GDPR compliant
Data processing agreements and EU-hosted infrastructure on request.
Clutch Top Developer
Verified client reviews, 4.9 average rating.
HIPAA-aware delivery
Process and infrastructure for regulated healthcare products.
What our clients say
Build powerful analytics and benefit from data-driven decisions.
SOAX
Anonymous
“The technical level of their iOS and Android developers was impressive.”
Clapps LLC
Eugene, Founder
“Their engagement and communication were impressive”
Vinsby
Grigorii Merkushev, CTO & Co-Founder
“RERO had great iOS developers who delivered quick and high-quality results.”
Joyteractive Limited
Leonid Zverugo, COO & Co-Founder
“They delivered everything on time and were quick to help.”
4logist
Andrius Juvko, CEO
“The team was easy to work with, frequently updated on the project's progress, and showcased good communication and technical skills.”
Our Cases
Case studies: turning ideas into reality with your expert team in mobile solutions.
-50% Stress
1450 → 1530
+37% GradesExpert AI Chat
Expert AI is a conversational platform that allows users to brainstorm, plan, and execute tasks within a single chat interface. Designed with a clean, user-friendly UI, it delivers practical assistance to streamline daily workflows
Cozy Kitchen
Cozy Kitchen is a mobile app designed to make meal planning and cooking easier for everyday users
Second Number
Call and text from anywhere on your device without a SIM card, using a private virtual number for personal or international communication
Up.You
A platform that connects people in need of psychological help with qualified professionals
SwopStore
SwopStore is a clean, modern corporate website that showcases services in a clear and engaging way
WeightLoss
An app with recipes and exercises where you can track your weight loss progress
Ready to bring your idea to life?
Transform your ideas into business apps. Fill in the form to connect with our designers and developers and get their expertise.
Frequently asked questions
What services do you offer?
We are a U.S.-based agency specializing in web and mobile solutions. Our services include: - User interface and experience design for mobile apps, websites, and web applications - Development of iOS, Android, and web applications tailored to your business needs
How much do you charge for your services?
Pricing depends on scope and complexity. We offer fixed quotes for clearly defined projects and monthly retainers for ongoing product work. After a short discovery call we send a detailed estimate.
Do you offer post-launch support?
Yes. We provide dedicated support plans covering monitoring, technical assistance, and ongoing enhancements so your product stays stable after release.
Will you sign a confidentiality agreement?
Absolutely. We're happy to sign an NDA before we discuss any sensitive details of your idea.
Can my app be developed for both iOS and Android?
Yes. We build native apps for iOS and Android, as well as cross-platform apps with Flutter when that's the better fit for your goals and budget.
Can I start with a basic version of the app and scale later?
Definitely. We recommend launching a focused MVP first, then iterating with new features based on real user feedback.
How do I choose between native and cross-platform app development?
It depends on performance needs, timeline, and budget. We'll walk you through the trade-offs and recommend the approach that best fits your product.
How do I secure funding for my startup app?
A polished MVP, clear metrics, and a strong pitch go a long way. We can help you ship an investor-ready product and prepare supporting materials.
What makes your UX design process stand out?
We start from research and real user flows, validate with prototypes, and design interfaces that balance user expectations with your business objectives.