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Mary Banky
@maryheroicdevop
Level 1
React Native, Nextjs, Nodejs, iOS, Android Mobile App, Game Full Stack Developer
United Kingdom
English, Italian, German
About me
I’m Mary, a Senior Full Stack & Mobile App Developer helping startups, businesses, and agencies build, fix, migrate, and launch digital products. I specialize in React Native, Flutter, Next.js, React, Node.js, TypeScript, Firebase, Supabase, PostgreSQL, MongoDB, and SaaS development. I build mobile apps, web apps, SaaS, AI apps, CRM systems, APIs, dashboards, Chrome Extensions (Manifest V3), Software and iOS, Android apps. I also build HTML/JavaScript games, online games and arcade games with Phaser.js, TensorFlow.js and MediaPipe, plus API, payment and authentication integrations.
Skills
Mary Banky
Offline •
Average response time: 1 hour
See my services
Full Stack Web Applications
I will develop a full stack software mobile app using react native expo supabase nodejs
Development & MVP
I will fix claude code react native emergent lovable replit mongodb supabase nodejs api
Portfolio
Work experience
Fiverr
Freelance • 4 yrs 6 mos
Mobile App Backend Developer - AI Travel Companion App
Jul 2026 - Present • 2 mos
Serve as lead backend and AI engineer for Ackee, a solo-travel AI companion app built on Flutter, Node.js/TypeScript, and a Python FastAPI/LangChain reasoning engine. Built the Live Context Intelligence pipeline integrating real-time weather, wildfire, and transit data as agent-callable tools, extending zero-hallucination safeguards into the system prompt. Migrated the AI backend from unencrypted HTTP/WebSocket to a fully secured HTTPS/WSS architecture with zero downtime for live beta users, including SSL certificate automation. Diagnosed and resolved production regressions including a critical async/await bug affecting user data deletion compliance, session management, and formatting consistency across the app's dual conversational engines. Delivered iOS TestFlight and Android Play Console release pipelines end to end. Skills: Python, FastAPI, LangChain, LangGraph, Flutter, Dart, Node.js, MongoDB, Nginx, Docker, Google Cloud, WebSockets, Prompt Engineering
Mobile App Developer, Capacitor Deployment Expert
May 2022 - Present • 4 yrs 4 mos
Specialize in converting Lovable, Base44, Replit, and PWA web applications into native iOS and Android apps using Capacitor. Handle the complete pipeline from Xcode/Android Studio configuration, code signing, and provisioning through App Store Connect and Google Play Console submission and review. Resolved complex issues including iOS safe-area/viewport rendering, WebView authentication persistence, Apple In-App Purchase (StoreKit) integration for subscription apps, and App Store Guideline 4.2 compliance for hybrid apps. Delivered projects across construction tech, real estate, job marketplaces, and consumer wellness verticals. Skills: Capacitor, Swift, Xcode, Android Studio, App Store Connect, Google Play Console, WebView, In-App Purchases
Backend Developer Health & Wellness Platform
Upwork • Freelance
Jun 2026 - Jun 2026 • 0 mos
Delivered a multi-phase Supabase security and infrastructure engagement for a menopause health app serving beta users. Conducted a full Row Level Security audit, fixed exposed service-role key vulnerabilities, and executed a project migration preserving 100+ live user records with zero data loss. Repaired a broken transactional email pipeline (Resend integration), fixed an AI Companion feature blocked by a missing API header, and resolved account invitation bugs. Delivered a UX review and legal/compliance screen implementation within Lovable's no-code environment. Skills: Supabase, PostgreSQL, Row Level Security, Lovable, React, Resend API
10 Reviews
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Rating Breakdown
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1-5 out of 10 Reviews
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whitneyjustine
United States
Ongoing collaboration
Mary was brought on for a trial building a live-context intelligence feature for a voice-first AI travel app, and it was an easy call to move her into an ongoing role after. The code was clean, with real test coverage for graceful failure handling. But what stood out most was the honesty — flagging...
Helpful?
whitneyjustine
United States
Ongoing collaboration
Mary was excellent to work with across this project — clean, well-tested code, and genuinely rare honesty about scope, gaps, and mistakes along the way, including her own. She caught architecture issues no one else had found and consistently delivered exactly what she promised, verified with real proof,...
Helpful?
whitneyjustine
United States
Ongoing collaboration
Working with Mary has been an incredible experience. She is highly skilled, fast, and remarkably thorough. She successfully integrated Google Places, Directions, and Routes APIs with complex fallback logic, optimized our server environments, and deployed live Google Maps deep-linking. Her communication...
Helpful?
whitneyjustine
United States
Ongoing collaboration
Incredible technical work and proactive communication. Mary delivered exactly to our acceptance criteria with zero disruption to our live users, proved every test step on video, and set up our SSL/Nginx environment flawlessly. Highly recommend working with her.
Seller's Response
Helpful?
whitneyjustine
United States
Ongoing collaboration
Clear communication throughout, fair when I raised concerns, and the end result held up. A couple of issues came up during testing and Mary was quick to diagnose and fix each one properly. Highly recommend.
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