Custom software development servicesA website for your business.
Your mobile app for iOS and Android.
App369 builds both, plus the backend, payments and AI features behind them, for startups and small businesses, from Miami, Florida.
Under the hood: Vue, Nuxt and React on the web; Flutter and Swift for iPhone and Android; Node.js, TypeScript and Firebase on Google Cloud behind them.
- Fiverr
- 5.0 · 126 reviews
- Own product
- Workspace369
- Fixed-price offers from
- $450
Mobile App Development
iOS and Android apps in Flutter or native Swift, from a first release to fixing an app that already has users.
- iOS App Development
- Android App Development
- Flutter Cross-Platform Apps
- App Store Optimization
Web Development
Web applications built with Vue.js and Nuxt, server-rendered for fast first loads.
- Custom Web Applications
- E-Commerce Platforms
- Progressive Web Apps (PWA)
- API Development
Backend & API Development
APIs, data models, background jobs and security rules in Node.js and TypeScript on Firebase and Google Cloud.
- REST APIs
- Firestore Data Models
- Background Jobs & Queues
- Security Rules & Cloud Cost
Payments & Integrations
Stripe billing and checkout, Twilio texting and calls, email and calendar integrations, tested before real money moves.
- Stripe Subscriptions & Checkout
- Stripe Connect Payouts
- Twilio SMS & Voice
- Email & Calendar APIs
SEO, GEO & AEO
Found and quoted by Google and by AI assistants: citation audits, structured data, answer pages and AI crawler rules, at fixed prices.
- AI Citation Audits
- Structured Data
- Answer-Ready Pages
- llms.txt & Crawler Rules
UI/UX Design
Research-driven design in Figma that delivers measurable results.
- User Interface Design
- User Experience Design
- Wireframing & Prototyping
- Design Systems
Technical Consulting
Our consultations help you choose the right stack and strategy before you invest.
- Technology Stack Selection
- Architecture Planning
- Code Review & Audit
- Digital Transformation
Maintenance & Support
Our support plans include bug fixes, security patches, OS updates, and crash and uptime monitoring, with critical issues handled first.
- Bug Fixes & Updates
- Performance Optimization
- Security Patches
- Crash & Uptime Monitoring
Start here
Tell Us About Your Project
Tell us about your project and receive a technical assessment by email, usually within one business day. Prefer to talk? Consultations are $100 per 15 minutes, paid upfront.
Fiverr reviews / 95 on app work
What buyers said about this kind of work
“Working with Simon has been an absolute pleasure. He’s not only incredibly skilled with his code, but he also brought so much care and attention to detail, especially when creating a custom section template for my Shopify site. He made the entire process smooth and collaborative, and consistently went above and beyond to make sure everything looked and functioned beautifully, very much the way I've envisioned. Highly recommend him for anyone looking for thoughtful, top-notch development support!”
A buyer in China, April 2025. Custom order on Fiverr “Very detailed and professional. Understands full scope of project before advancing and has honest but critical feedback. such a pleasure with consultation and can't wait to get started.”
A buyer in the United States, July 2024. Custom order on Fiverr “Had a great consultation with Szymon. He knows his stuff and I have a deeper understanding of how my new mobile app can work.”
A buyer in the United States, April 2024. Custom order on Fiverr
Read the whole story
- Sixteen five-star reviews from one buyer: mobile apps, app design and a Shopify store (Mark, United States)
- A large custom app build, delivered on the back end and the front end (A buyer in the United States)