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I need a React Native / Expo developer to complete my iOS journaling app called Black Box Journal. Built with Expo SDK 55, TypeScript, Expo Router, Supabase. Need: UI polish, Supabase RLS security + data persistence, RevenueCat in-app purchases (Annual £29.99 / Monthly £5.99 / Lifetime £199), Apple Sign-In + email auth, push notifications (expo-notifications), and AI mood trend analysis via OpenAI API. Fixed price up to £500, deadline 28 May 2026. Must show proof of prior RevenueCat integration.
Project ID: 40426871
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82 freelancers are bidding on average £617 GBP for this job

⭐️⭐️⭐️ Black Box Journal – Expo React Native Finishing & Production Polish⭐️⭐️⭐️ I will complete and stabilise your Black Box Journal iOS app built with Expo SDK 55, TypeScript, Expo Router, and Supabase, focusing on production readiness, security, and monetisation. The goal is to turn your current build into a fully launch-ready App Store product with clean UX and reliable backend logic. I will handle UI/UX polish across key screens to ensure consistent spacing, typography, and smooth navigation flow, while keeping the existing app structure intact. On the backend side, I’ll implement secure Supabase RLS policies and ensure proper data persistence for journal entries and user activity. Monetisation will be fully integrated using RevenueCat, including Annual (£29.99), Monthly (£5.99), and Lifetime (£199) plans with Apple-compliant subscription handling and restore purchases flow. I will also implement Apple Sign-In alongside email authentication for secure onboarding. Push notifications will be configured using expo-notifications for reminders and engagement, and I’ll integrate OpenAI API to enable AI-based mood trend analysis and insights from journal entries. Let’s chat… Thanks
£810 GBP in 7 days
9.3
9.3

Hello, I hope this message finds you well. I am excited about your project, "Polish and Complete iOS Journaling App." With my expertise in React Native and Expo, I can help you enhance the Black Box Journal app effectively. I have extensive experience in mobile app development, particularly with iOS applications. My skills in Typescript and security best practices will ensure that the app is not only polished but also secure for users. I understand the importance of user experience in a journaling app and will focus on delivering a seamless interface. Could you please provide more details about the specific features you want to be polished? Additionally, do you have a timeline for the project completion? Lastly, are there any particular security features you want to implement? Looking forward to your response! Best regards.
£500 GBP in 6 days
6.6
6.6

Hi, We’ve developed multiple apps with Expo and integrated RevenueCat for in-app purchases, so we know how to handle subscriptions and manage user entitlements effectively. We also have extensive experience with server-side languages like Node.js and PHP, which can be valuable for backend tasks such as webhooks and cron jobs. In addition to our technical expertise, we bring a strong product mindset. We’ve worked with startups as product managers, so we understand how to prioritize features that truly matter to users. Let’s schedule a quick introductory call to discuss your project in more detail and see if I’m the right fit. I usually respond within 10 minutes. I’m eager to learn more about your exciting project. Best regards, Adil
£550 GBP in 7 days
5.9
5.9

Hi, Black Box Journal already has a solid modern stack, which means the real value now is tightening the product experience, security, and subscription flow before launch — and that’s exactly where we can help. We can complete the Expo SDK 55 app with polished UI refinement, secure Supabase RLS/data persistence, RevenueCat subscription integration, Apple Sign-In, push notifications, and OpenAI-powered mood trend insights. We also have prior experience implementing RevenueCat subscriptions and handling App Store purchase validation flows correctly within React Native/Expo environments. We understand the importance of keeping journaling apps smooth, private, and emotionally engaging, especially when AI analysis and subscriptions are involved. Ready to start immediately and work toward your May 28 deadline. Best Regards Gensols
£500 GBP in 7 days
6.4
6.4

⭐⭐⭐⭐⭐ ✅Hi there, hope you are doing well! I have previously completed React Native apps with Expo, integrating RevenueCat subscriptions smoothly for seamless in-app purchases. The most important part to successfully complete your journaling app is ensuring robust Supabase RLS security and flawless RevenueCat integration for a smooth user experience. Approach: ⭕ Polish the UI to an intuitive, attractive design matching iOS standards. ⭕ Implement and test Supabase RLS policies for secure and persistent user data. ⭕ Integrate RevenueCat subscriptions (Annual, Monthly, Lifetime) with proof of prior work. ⭕ Set up Apple Sign-In and email authentication. ⭕ Add push notifications using expo-notifications. ⭕ Develop AI-powered mood trend analysis via OpenAI API. ❓ Could you please share your current repository access or codebase setup? ❓ Do you have RevenueCat credentials and Apple developer account ready? ❓ Any specific UI design references you'd like me to follow? I am confident in delivering a polished, secure, and fully functional app by your deadline with the features you require. Looking forward to collaborating with you. Best regards, Nam
£550 GBP in 5 days
5.2
5.2

Hello! As per your project post, you’re looking to polish and complete your iOS journaling application Black Box Journal built on Expo SDK 55 with React Native, TypeScript, Expo Router, and Supabase. The goal is to finalize the app into a production ready experience with secure authentication, subscription monetization, reliable data persistence, AI powered mood analysis, and a refined premium journaling UI before your May 28, 2026 deadline. My focus will be on delivering a polished and stable iOS application including UI/UX refinements, secure Supabase Row Level Security implementation, reliable journal data persistence workflows, RevenueCat subscription integration for Annual, Monthly, and Lifetime plans, Apple Sign In and email authentication, Expo push notification setup, and OpenAI powered mood trend analysis integrated into the journaling experience. I specialize in building React Native and Expo applications with strong experience in Supabase, RevenueCat subscriptions, secure authentication systems, push notifications, and AI powered mobile features, with focus on production ready mobile UX/UI, scalable backend workflows, and App Store compliant monetization systems. Let’s connect to review the current codebase status, remaining blockers, and App Store preparation requirements so we can finalize the completion roadmap and delivery milestones. Best regards, Nikita Gupta.
£300 GBP in 18 days
5.3
5.3

Your iOS journaling app, Black Box Journal, sounds like a stimulating project that perfectly aligns with my skills as a full-stack mobile developer. With extensive experience in React Native and Expo SDK, I am highly proficient with UI design and app functionality - precisely the areas where you need assistance. Additionally, my expertise extends to include push notifications using expo-notifications and AI mood trend analysis through OpenAI API. To make your app truly unique and valuable, mood trend analysis can help users gain a deeper understanding of their emotions and insights into patterns. My stellar organizational skills guarantee timely submissions even under tight deadlines. Let’s discuss further how I can bring your vision to life!
£650 GBP in 20 days
5.1
5.1

Hello, I can complete your Black Box Journal iOS app (Expo SDK 55, TypeScript, Supabase) and bring it to a production-ready state. Work Scope UI Polish Fix layout and UX issues across iOS devices Improve navigation and visual consistency Ensure smooth, stable user experience Backend (Supabase) Set up proper data persistence Implement secure Row Level Security (RLS) Fix sync and storage issues Authentication Apple Sign-In integration Email/password login Secure session handling via Supabase Subscriptions Full integration of RevenueCat Monthly £5.99 / Annual £29.99 / Lifetime £199 Paywall + entitlement + restore purchases Push Notifications Setup expo-notifications Daily reminders and basic engagement alerts AI Features Integrate OpenAI API for mood trend analysis Weekly/monthly journaling insights Deliverables Production-ready iOS build (Expo) Fully working auth + payments + notifications Secure Supabase backend with RLS AI mood analysis feature integrated Clean, maintainable codebase + documentation Experience I have worked on React Native apps involving: RevenueCat subscription systems Supabase authentication + RLS setups Expo push notification workflows Production-level app fixes and polish I understand your fixed budget (£500) and deadline (28 May 2026) and can structure delivery in clear milestones to ensure stable, tested completion. Warm regards, Harpreet Singh
£250 GBP in 5 days
4.6
4.6

Black Box Journal already has the right foundation for a stable iOS launch — the remaining work is mostly about tightening reliability around subscriptions, auth flows, and long-term data integrity so users never lose entries or hit broken purchase states. I’d handle this by locking down Supabase RLS around journal ownership, then stabilizing persistence/offline recovery before polishing UI flows. RevenueCat would be wired with proper entitlement handling for renewals, restores, cancellations, and lifetime unlock edge cases. For AI mood trends, I’d keep OpenAI processing lightweight and async so analysis never blocks journaling interactions or increases app latency. I recently shipped subscription-based mobile flows with RevenueCat and Expo, including Apple Sign-In, restore purchases, and webhook-based entitlement syncing. The app sounds close to production-ready — this is mainly disciplined finishing work. Q1: Are subscriptions already created in App Store Connect and linked to RevenueCat? Q2: Should AI mood analysis run per-entry or generate weekly/monthly trends from aggregated data? Q3: Do you need offline journaling with delayed Supabase sync handling?
£500 GBP in 7 days
4.7
4.7

Hi, I'm excited about your project to polish and complete the Black Box Journal iOS app. With extensive experience in React Native and Expo, including Expo SDK 55 and TypeScript, I am confident in delivering a smooth, secure, and feature-rich journaling experience. I've successfully integrated Supabase RLS for security and data persistence, and I bring proven expertise with RevenueCat in-app purchases, ensuring seamless management of your subscription plans (£29.99/annual, £5.99/month, £199/lifetime). Additionally, I can implement Apple Sign-In, email authentication, push notifications using expo-notifications, and AI-powered mood trend analysis via the OpenAI API. I propose to start immediately and deliver a polished, fully functional app ahead of the 28 May 2026 deadline, staying within your £500 budget. Please share any current challenges you're facing with RevenueCat or Supabase to better tailor the solution. Could you please share any existing challenges or specific requirements you have around the RevenueCat integration? Best regards,
£555 GBP in 15 days
4.5
4.5

I can help with this, I will polish the Black Box Journal app on Expo SDK 55: Supabase RLS, RevenueCat for Annual/Monthly/Lifetime SKUs, Apple Sign-In + email auth, expo-notifications, and OpenAI mood trend analysis with weekly aggregates via Edge Functions. The piece most RevenueCat integrations miss is keeping entitlement state client-side only. I will wire a RevenueCat webhook to Supabase that writes is_premium on purchase, renewal, refund, and cancellation, so RLS policies on AI features gate premium server-side. Without this, premium breaks under restored purchases. Past RevenueCat integrations I will share in chat. Questions: 1) Existing OpenAI key/budget set, or in scope? 2) iOS-only at this stage, or Android later? Ready to start whenever you are. Faizan
£440 GBP in 7 days
4.1
4.1

Hello, I am free now and can start work immediately in your timezone. I'm excited about the opportunity to work on your Black Box Journal app. With experience in React Native and Expo, I can help polish the UI, secure data with Supabase RLS, and integrate RevenueCat for seamless in-app purchases. I'll also implement Apple Sign-In and email authentication, set up push notifications, and incorporate AI mood trend analysis using the OpenAI API. Meeting your deadline won't be an issue. I've successfully integrated RevenueCat in previous projects and can provide proof of this experience. Looking forward to bringing your app to life!
£500 GBP in 7 days
3.6
3.6

Hello! I am a US-based senior software engineer with extensive experience in mobile app development, particularly with React Native and Expo. I've carefully reviewed your project description for the Black Box Journal app and I'm excited about the opportunity to polish and complete it. With about 15 years in the field, I specialize in creating production-ready applications that prioritize user experience and security. My previous work includes a journaling app that successfully integrated user feedback features and a high-performance e-commerce platform focused on user engagement. I have also been a Shopify partner since 2016, building various apps and themes. To ensure I fully grasp your vision, could you please clarify the following questions? 1. What specific features or enhancements are you looking to implement in the app? 2. Are there particular design elements or user experience improvements you have in mind? I believe that a structured approach—starting with a detailed review of the current app, followed by iterative development and testing—will lead us to success. I am dedicated to paying attention to the details and ensuring the final product aligns with your goals. Looking forward to the possibility of collaborating on this project! Best, James Zappi
£600 GBP in 5 days
3.2
3.2

Hello, I understand you're looking for a React Native/Expo developer to finalize your iOS journaling app, Black Box Journal, with features like UI polishing, secure data persistence, in-app purchases, and AI mood analysis. I'm Taiwo, a UK-based Senior Software Developer with 10 years of experience and a Master’s in Cyber Security. My background includes working with top companies like IBM, UK Government, BMW, and Sky. I have experience integrating payment services, securing data, and implementing AI features. For your project, I will ensure your app has a polished UI, secure Supabase RLS, functioning RevenueCat in-app purchases, Apple Sign-In, push notifications, and OpenAI API integration for mood analysis. Relevant projects: ⏺ OneKey - Built a mobile and admin portal API for an estate management company ⏺ Equity Share - Built backend functionality for a US real estate crowdfunding platform with a focus on secure, scalable application logic. I can begin with UI/UX improvements and then focus on security, in-app purchases, push notification implementation, and AI integration. Given the deadline of May 28, 2026, a detailed project plan will be created to ensure a smooth process. If this approach aligns with your vision, let's discuss next steps.
£520 GBP in 7 days
2.0
2.0

Hi, there Portfolio : https://www.freelancer.com/u/seandinwiddie Black Box Journal already has a strong foundation — now it just needs the final polish before it graduates from “promising app” to “where did you find this?” ? I can help complete the Expo SDK 55 app with polished UI/UX, secure Supabase RLS policies, stable data persistence, RevenueCat subscriptions, Apple Sign-In, push notifications, and OpenAI-powered mood trend analysis. I’m experienced with React Native + TypeScript architectures and understand the quirks of iOS subscription handling and Expo workflows. I can also provide proof of previous RevenueCat integrations during discussion and keep the codebase clean, scalable, and App Store ready within your timeline. Let’s discuss your project in detail. Best Regards, Sean D.
£500 GBP in 7 days
1.1
1.1

Noticed this is Expo SDK 55 with Expo Router and Supabase plus RevenueCat billing — that stack usually needs careful RLS and entitlement syncing to avoid accidental data leaks or double-charging. The biggest risk is unfinished server rules and unreliable entitlement checks. I’ll focus first on Supabase row-level security and reliable server-side validation for subscriptions, then finish the UI polish and features so the app is stable for App Store review. I integrated RevenueCat (subscriptions + lifetime entitlement) into a consumer journaling/habit app last year, including server verification and sync with user records in Supabase. Plan: run a quick code audit, add Supabase RLS and API endpoints for validated entitlements, integrate RevenueCat with the Expo workflow, add Apple Sign-In + email auth, wire expo-notifications and APNs, and implement an OpenAI endpoint for simple mood trend analysis. Finish UI tweaks and test flows end-to-end. Can you grant repo access and provide RevenueCat project keys, Apple Team/Bundle IDs, OpenAI key, and any designs so I can run an initial audit and confirm delivery for £500 by 28 May?
£500 GBP in 7 days
0.0
0.0

Lets chat, a free consultation and no obligation. I understand you need a clean, professional, and user-friendly solution for your "Polish and Complete iOS Journaling App" project. My skills in PHP, Java, JavaScript are a perfect fit for this project. While I am new to freelancer.com, my extensive experience delivers integrated, automated solutions. Regards, Jason McLachlan
£562 GBP in 3 days
0.0
0.0

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