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Project Title Senior Mobile Developer – Inject Custom Audio into Live Calls (iOS & Android) Project Description (Public-Facing) Project Overview We have a mobile application with a complete user interface built using Lovable, a platform that generates React-based web applications. The app functions correctly in all areas except for its core audio feature. We are looking for a senior mobile developer to solve this single, critical technical challenge. The final deliverable must be a fully integrated, stress-tested, and robust solution ready for production use. The Core Technical Requirement The app must allow a user to play a short, pre-selected audio track (approx. 3 minutes, looped) during an outgoing live call (cellular, WhatsApp, or other social media apps). The critical requirement: The other party on the call must hear this audio track clearly, while the user's own voice also remains audible. The audio track is played directly from the user's phone. What This App Is NOT To avoid confusion, this project is not: A voice recording, voice-to-text, or audio memo app. An app to play sound locally on the user's device. A project that can be solved with web-based audio APIs (e.g., Web Audio). A project requiring a full app rebuild. Current State & Challenge The app's UI is complete and functional (navigation, contact list, location toggle, scenario library). The app currently uses a web-based audio processing layer, which cannot access the necessary low-level device audio APIs required for this feature. The core challenge is that the audio track must be mixed with the user's voice and routed directly into the outgoing call audio stream on the device. Context on Lovable: Lovable generates React-based web applications. The current app is essentially a web view wrapper. The UI and standard features are functional and should remain intact. The audio processing is currently handled via web APIs, which cannot perform the required call injection, AEC, or low-latency audio. Important: The problem is not a bug in the UI. It is a fundamental architectural limitation of the web-based platform for this specific audio task. Required Technical Expertise We need a developer with proven, hands-on experience in: Area Specific Requirements Call Stream Injection Demonstrable experience manipulating the audio output of a live call on both iOS and Android platforms. This includes mixing pre-recorded audio with the microphone input. Native Audio Integration Deep knowledge of platform-specific audio APIs: iOS: AVAudioSession (with .playAndRecord mode), AVAudioEngine, and experience with CallKit for VoIP integration. Android: AudioManager (with MODE_IN_CALL mode) and experience with low-latency audio APIs like Oboe or AAudio. Cross-Platform Architecture Experience integrating high-performance native audio modules (written in Swift/Kotlin/C++) into a cross-platform app shell, such as React Native. This will involve creating native module bridges. Audio Pipeline Optimization Experience with Acoustic Echo Cancellation (AEC), Noise Suppression (NS), and Digital Signal Processing (DSP) to ensure a clean, low-latency audio stream (target < 30ms). Integration & Testing A clear methodology for integrating the native module into the existing app, testing across different device types and network conditions, and stress-testing for reliability. Technical Approach We Expect The solution must follow this hybrid architecture: Layer What Stays in Lovable What Rebuilds Natively UI (Screens, Navigation) - Keep Contact List Access - Keep (web API) Location Toggle - Keep (web API) Scenario Library Management - Keep (web API) Audio Playback & Mixing - Native Module (Swift/Kotlin) Call Stream Injection - Native Module (Swift/Kotlin) AEC / Noise Suppression - Native Module (C++/DSP) Bridge/Communication - Native Module Bridge (React Native style) Key Points: The Lovable UI should remain intact. The native audio module must communicate with the Lovable React app via a bridge. The user should not notice any difference in the UI experience. Final Deliverables & Quality Standards The project is not complete until the solution is: Fully Integrated: The native audio module must be seamlessly integrated into the existing app's architecture. The user must be able to trigger the audio playback during a call through the existing UI. All existing app functions (e.g., contact list access, location toggle) must continue to work as expected. Rigorously Stress-Tested: The solution must be validated across a range of devices (at least 5 different iOS and Android models), including older and lower-end phones. Testing must cover various real-world call scenarios: Cellular calls (4G, 5G, and poor signal conditions). VoIP calls (WhatsApp, Messenger, etc.). Calls with Bluetooth headsets and speakerphone. Calls of varying durations (short and long). The system must be proven stable under continuous, repeated use (e.g., back-to-back calls) without crashing or degrading audio quality. Robust & Dependable: The solution must handle interruptions gracefully (e.g., incoming calls, system notifications, network drops). Audio quality must remain consistent across all tested scenarios. The developer must provide clear documentation on the integration, testing process, and any potential limitations. What to Include in Your Proposal To be considered, please structure your proposal around the following: Relevant Experience: Provide specific examples of previous projects where you successfully injected or manipulated audio in a live call stream on iOS and/or Android. Please include links to published apps where this was a core feature. High-Level Architecture: Briefly describe your technical approach for this project. This should include a clear explanation of how you would route the mixed audio to the outgoing call stream on both platforms. Integration Strategy: Explain how you plan to integrate the native module into the existing Lovable React app and ensure all UI elements work as expected. Please confirm you understand this hybrid architecture approach. Testing Plan: Provide a detailed testing plan covering the stress-test scenarios listed above, including the devices you will test on and how you will validate reliability. Latency Target: Confirm your target latency (<30ms) and outline your testing plan to validate this across a range of devices. Timeline & Cost: Provide a clear estimated timeline and cost breakdown, focusing specifically on solving this single audio challenge, including the integration and testing phases. Summary for Interested Developers Requirement Non-Negotiable? Inject audio into live calls (cellular, WhatsApp, etc.) - Yes iOS AVAudioSession / Android AudioManager expertise - Yes React Native bridge / hybrid architecture experience - Yes AEC / Noise Suppression experience - Yes <30ms latency target - Yes Stress testing across 5+ devices - Yes Full integration into existing Lovable UI - Yes
Project ID: 40613517
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306 freelancers are bidding on average £1,080 GBP for this job

Hello, i am ready to discuss the details, when you're available ping me so we can discuss and fix the things as required. am a mobile applications developer and i have more than 8 years of experience developing mobile applications with backend services. i have developed many Business Solutions from scratch to Stores ready applications. i have completed more than 550 projects. i have live sample apps for you. i am super confident i will provide you best quality software services on time and on budget. Let's chat to proceed.
£750 GBP in 15 days
8.9
8.9

With over a decade of experience in mobile app development, specializing in both iOS and Android platforms, I understand your need for a senior mobile app developer to tackle the technical issues plaguing your app's concept. My background in scaling apps for over 1 million users and handling high-complexity systems, such as AI/ML development and FinTech, directly aligns with the challenges your project is facing. To ensure scalability and security for your app, I recommend implementing a robust audio processing framework that incorporates dedicated chips, Acoustic Echo Cancellation, Noise Suppression, and DSP technology. This strategic approach has proven successful in my past projects and will undoubtedly elevate the performance of your app. I invite you to reach out to further discuss how we can collaborate to bring your app concept to life seamlessly. I am excited about the opportunity to contribute to your project and deliver high-quality results within the specified budget and timeline.
£1,200 GBP in 20 days
8.4
8.4

Hello, I understand you require a senior mobile app technician to address a core conceptual challenge affecting your existing iOS and Android application. My expertise in dedicated audio processing chips, Acoustic Echo Cancellation, Noise Suppression, DSP, and sophisticated software layers is perfectly suited to resolve such foundational technical complexities. I’m Waqas from Eclairios, a professional software engineer with over 7 years of experience in app and web development. I have successfully completed 128 projects, earning a 5.0 rating from satisfied clients. I specialize in mobile apps (Android, iOS, Flutter), website development, custom APIs, and backend solutions. My goal is to deliver high-quality, scalable solutions that meet your business needs. Why hire me? ★ 100+ Projects Completed with 5-star rating. ★ 3 months of free post-launch support ★ Expertise in advanced technologies and systems Let’s connect and discuss how I can help you with your project. Best regards, Waqas
£1,026 GBP in 7 days
8.4
8.4

Hello, how are you? I am a mobile app developer working for over 8 years. I have a team with a few developers and designers. We have finished many projects before, and I am sure we can help you with yours also. I would like to have a meeting with you and see about your idea for the project, and I am sure my team and I can make it into an amazing product. Looking forward to hearing from you. Regards, Andrija!
£1,125 GBP in 7 days
8.6
8.6

Hi — Elias here from Miami. I see you're looking for a senior mobile app developer to provide a technical solution for your project. It’s clear you aim to deliver a robust mobile experience, essential for user engagement and retention. The real challenge lies in ensuring scalability and maintainability. Mobile applications often face complexities in state management and integrations with various backend services. What usually matters most is how well the app adapts to future features without compromising performance. A common issue in projects like this is managing user permissions effectively. My approach would involve structuring the app with a clear architecture that supports easy updates and expansions. I focus on using technologies like Flutter or React Native for cross-platform capabilities, ensuring a smooth user experience while maintaining a single codebase. I've worked on similar apps where performance and reliability were key, allowing me to anticipate potential pitfalls before they arise. A few questions to better understand the scope: Q1 – What user roles and permissions do you envision for the app? Q2 – Are there specific backend integrations we need to prioritize? Q3 – What are your scaling expectations as user adoption grows? Happy to discuss the details and suggest the best technical approach. Looking forward to hearing from you.
£1,200 GBP in 6 days
8.1
8.1

I can assign the swift developer haveing 9+ years of experience worked on the complex project will charge £9 per hour he can work full time or part time. Also pay as you go. Let’s connect for an interview Thanks
£1,125 GBP in 7 days
8.3
8.3

Hello, Greetings Hope you are doing well. I am a Mobile Application developer with over 5 years of experience. I am confident in my ability and skills to develop high-quality Mobile apps and would like to work on your mobile app project. I will complete the work as per your requirements. I want to discuss more this project to prepare the final concept. So let’s discuss this in detail over chat then will make plans to start work on it. Waiting for your earliest reply. Thanks. Shubham
£750 GBP in 18 days
8.0
8.0

Hi there, It sounds like your app's UI is complete, but the core audio processing pipeline-the very concept-is failing. The system needs to reliably capture raw audio, apply real-time Acoustic Echo Cancellation (AEC) and Noise Suppression (NS), and then run it through a custom software layer, which is likely beyond the capabilities of a high-level platform due to the low-level hardware access required. Technical approach: We'll develop a dedicated native audio processing module for both iOS (Swift/C++) and Android (Kotlin/C++). This module will interface directly with core audio APIs and proven DSP libraries for the AEC/NS stack. We would then integrate this high-performance module into your existing app shell via a native bridge. Core modules: This involves an Audio Input Manager to normalize microphone access across devices, a real-time DSP Pipeline that applies NS and AEC sequentially, and an Output Handler for the processed audio stream. This isolates the complex logic, making it robust and testable. Relevant systems: We have built systems requiring low-level audio stream management, including an Android Call Management app with FreeSWITCH integration and the SecureCom platform which handled E2E encrypted voice calls. Our strategy is to first build a minimal Proof-of-Concept app to validate the audio pipeline on a target device. Once confirmed, we integrate this tested module into your main application, ensuring the core concept works perfectly before full deployment. Regards, Rohit
£750 GBP in 30 days
8.1
8.1

Hey, I’ve carefully reviewed your project, and I understand you need a senior mobile developer who can investigate the core technical challenge behind your existing iOS and Android app and provide a practical solution for the audio-processing requirements. I can help evaluate the current implementation and define the right architecture for reliable performance. I will review the existing app, analyze the audio pipeline, assess DSP requirements, and provide recommendations around Acoustic Echo Cancellation, noise suppression, audio processing layers, and hardware/software integration. I’ll focus on identifying the technical limitations and creating a clear path toward a stable, production-ready solution. I have hands-on experience with similar mobile and audio-focused projects and would be happy to share relevant examples during our discussion. One quick question: What is the main audio functionality your app needs to achieve, and is the current Lovable build connected to any native iOS/Android audio processing components yet? Portfolio: https://www.freelancer.com/u/Hammadhassan21 Best Regards, Hammad Hassan
£1,000 GBP in 15 days
7.3
7.3

Hi, Thank you for sharing the project. Your app sounds very interesting, and we'd be happy to help evaluate the technical challenges behind the core functionality. Our team has experience with cross-platform iOS/Android development, audio-based applications, API integrations, and performance optimization. We'd first review the existing app, identify the root cause of the technical limitations, and then recommend the most reliable solution before moving into implementation. Please share more details about the app's current architecture and the specific audio challenge you're facing. Once we've reviewed it, we'll provide a clear timeline, estimated cost, and implementation plan. Looking forward to discussing your project. Thank you!
£1,000 GBP in 30 days
7.6
7.6

With a background in developing advanced mobile applications for iOS and Android, I specialize in integrating complex audio features like Acoustic Echo Cancellation, Noise Suppression, and DSP chip optimization. I can address the technical challenges your app faces, ensuring seamless integration and optimal performance. To ensure success, I propose a phased approach focusing on critical technical challenges first, followed by future enhancements. By understanding your app's architecture, user interactions, and performance metrics, we can align the solution with your business goals and scalability needs. Let's discuss potential integrations, security measures, and strategies for future enhancements to make the app technically robust and future-proof. Through transparent communication, we can ensure the project's success within an agreed timeline. I'm excited about the opportunity to collaborate with you as your technology partner, driving the success of your app project with technical excellence and strategic planning.
£1,350 GBP in 5 days
7.1
7.1

Hi, I will dig into your Lovable app and resolve the core audio pipeline issue: getting Acoustic Echo Cancellation, Noise Suppression, and DSP processing working reliably on both iOS and Android. You will end up with a production audio layer that handles the real concept of the app, not just the shell around it. On a similar project, replacing a generic WebRTC audio path with platform native audio units (Core Audio on iOS, AAudio/Oboe on Android) eliminated the echo and latency problems entirely. I will apply the same approach here. Questions: 1) Is the audio processing meant to happen in real time during calls, or on recorded clips after capture? 2) Are you open to native modules for the audio layer, or does everything need to stay within the Lovable/web stack? Looking forward to talking through the details. Kamran
£836 GBP in 25 days
7.5
7.5

Hi, I see that your app's audio features need some serious fine-tuning, especially around noise suppression and echo cancellation, which is quite a challenge. I've worked on projects like the Labop Freelancer Marketplace and the Car CRM demo, making apps better for users and fixing complex issues. I will handle the audio processing part by improving how the app interacts with the hardware to get clearer sound. Have you ever wondered if the sound quality could be improved without changing the whole app? Let's chat about a plan to create something bigger and better with your app. Regards, Nick.
£750 GBP in 6 days
6.6
6.6

I'm excited to help resolve the technical challenges with your mobile app on both iOS and Android platforms. My focus will be on optimizing performance and ensuring a seamless user experience. I see you need expertise in dedicated audio processing chips, Acoustic Echo Cancellation, and Noise Suppression. These are crucial for enhancing the app's functionality and user satisfaction. With over five years of experience in mobile app development, I specialize in these areas and have successfully delivered similar projects. We have 20+ 5-star reviews on similar projects! I can provide examples of my previous work and an estimated timeline for completion. Regards, InterconnectBPO
£850 GBP in 7 days
6.8
6.8

Hi there, I can help evaluate your existing app, identify the core technical challenges, and propose a reliable architecture for both iOS and Android. With experience in mobile development and complex audio workflows, I can assess the current implementation, recommend the right approach for DSP, Acoustic Echo Cancellation, Noise Suppression, and low-latency audio processing, then work toward a scalable production-ready solution. Question: Could you explain the app’s core concept and the specific audio problem you’re trying to solve, since you mentioned the technical issue is the entire concept itself? Kindly send me a message to discuss more in detail. Thanks.
£750 GBP in 8 days
7.2
7.2

Hi, The sentence that caught my attention was: "he technical issue that remains just happens to be the whole concept of the app." That tells me you're not looking for another mobile developer, you're looking for someone who can validate and solve the core technical challenge behind the product. Since the app has already been created in Lovable, I wouldn't recommend rebuilding anything until the underlying audio architecture is understood. Features involving Acoustic Echo Cancellation (AEC), Noise Suppression, DSP, and dedicated audio hardware depend heavily on the complete audio pipeline, device limitations, latency requirements, and how audio is captured, processed, and transmitted. Getting this wrong early can lead to months of development without a usable result. My first step would be to review the existing application, understand the intended audio workflow, identify where the current implementation breaks down, and determine whether the solution should be implemented at the application layer, native mobile layer, or through specialized audio processing components. Once the technical direction is validated, we can integrate it into the existing codebase instead of rebuilding the project. I'd be glad to discuss the concept and determine the most practical technical solution. Regards, Avinash Jain Procode IT Services
£1,500 GBP in 30 days
7.0
7.0

Hi there, I am Efanntyo, and I'm excited about the opportunity to collaborate on your mobile app project. Your need for a senior mobile app developer to address the technical challenges of your app on both iOS and Android platforms is something I am well-equipped to handle. With extensive experience in developing high-quality apps across iOS and Android, I have honed my skills in specialized areas such as dedicated audio processing chips, Acoustic Echo Cancellation, Noise Suppression, and DSP. My approach is to leverage this expertise to deliver a robust solution that addresses the core technical issues you are facing. I understand that the primary challenge involves not just refining the app's concept but implementing advanced software layers that ensure optimal performance. I am committed to offering a comprehensive solution that resolves these challenges through rigorous problem-solving and attention to detail. Throughout the project, I prioritize clear and continuous communication to ensure you are always in the loop and can provide feedback as needed. You can expect a professional yet approachable partnership aimed at achieving your app's objectives effectively. Please feel free to review my portfolio for examples of my work that reflect a strong track record of delivering successful mobile applications. I look forward to discussing how I can contribute to the success of your project. Best Regards, Efanntyo
£1,125 GBP in 14 days
6.5
6.5

Hi there, I understand your app is already built on Lovable but facing core technical challenges related to its architecture and cross-platform functionality. As a senior mobile developer with deep expertise in both iOS and Android, I’ve successfully resolved complex app logic and scalability issues in Flutter-based projects. I’ll audit your current codebase, identify the root causes behind the conceptual gaps, and refactor critical components using clean, maintainable patterns—leveraging Flutter for consistent performance across platforms, Swift for native iOS optimizations, and Kotlin for robust Android integration. My approach includes: 1. Conducting a full technical review of the existing app structure 2. Re-architecting core modules for better scalability and state management 3. Ensuring seamless cross-platform behavior without sacrificing native performance 4. Providing clear documentation and recommendations for future development I’ll deliver a stable, well-structured solution within 10 days, ready for testing and deployment. Best Regards, Khorshed Alam, RS Software
£1,050 GBP in 12 days
6.7
6.7

Hi, the main issue here does not read like basic mobile implementation; it reads like an unresolved audio-system architecture problem inside an app that already has a front end. The real engineering risk is not Swift or Kotlin delivery by itself, but whether the signal path, device behavior, and hardware assumptions are technically viable across iOS and Android. I’ve worked on live production systems where the first step was to inspect an existing build, isolate the failure boundary, and separate product assumptions from platform constraints. That matters here because “the whole concept” being the issue usually means the architecture was never validated against real device behavior. The closest relevant work from my side is Custom Feature Development & Integration, where I dropped into an existing product, reviewed the codebase, and mapped a practical path forward. TikTok AI Livestream Setup is also relevant on the media side because it involved low-latency audio flow, routing, and end-to-end debugging. I usually structure this kind of engagement as discovery first: isolate capture, processing, playback, and hardware interaction as separate layers, then verify what is failing on each platform before discussing broader rebuild decisions. If useful, I can start by reviewing the current app architecture and outlining the failure points that need to be proven or redesigned. Thanks, Hercules
£1,500 GBP in 7 days
6.7
6.7

Hi, I understand you're looking for a senior mobile developer to take an existing iOS and Android app beyond its current prototype and solve the core technical challenges behind the product. The key focus appears to be implementing advanced audio processing capabilities, including Acoustic Echo Cancellation, Noise Suppression, DSP integration, and a reliable software layer that delivers consistent real-time performance across both platforms. I've worked on complex mobile applications, MVPs, and performance-critical solutions involving native integrations and scalable architectures. I would first evaluate the current implementation, identify technical gaps, and recommend the most reliable approach before development. Estimated timeline is 8–12 weeks depending on the current code quality and hardware integration requirements. Let's discuss further. Regards, SNR
£900 GBP in 7 days
6.9
6.9

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