Backend Developer for Mobile Conversational App

@AwaisChaudhry

Hi, I’m Muhammad Awais, and I will build a reliable, low-latency serverless backend on AWS for your mobile-first conversational app. The backend will run Lambda behind API Gateway to ingest voice and text, connect to a third‑party language processing API, and manage session state with expiry. I will deliver structured, predictable responses and privacy‑conscious logging, with UTF-8 payloads and language metadata so it’s ready for internationalization. Infrastructure as code (CDK or SAM) will deploy to your AWS account, with clear docs and test coverage. The system stays focused on reliability and UX, with thoughtful error handling, retries, and graceful fallbacks, not heavy optimization. Deliverables include an end‑to‑end backend for a basic voice/text flow, session persistence with expiration, privacy‑safe logging, and a README explaining configuration and extension points. What external language processing API do you prefer, and what should be the session expiration policy and privacy constraints for logs? Best regards,

@eclairios

Hello, Your vision for a private-beta, mobile-first web app focused on real-time voice and text conversations, backed by a reliable, low-latency AWS serverless backend, is a perfect fit for my skills. I specialize in crafting robust AWS Lambda and API Gateway solutions, integrating third-party language processing APIs, and ensuring maintainability, clear documentation, and excellent UX through thoughtful error handling. 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

@leadconcept

Greetings, I understand you need a reliable, serverless AWS backend for your private-beta, mobile-first conversational app. The backend will handle voice and text input via Lambda behind API Gateway, integrate with a third-party language API, manage session-based conversations with automatic expiration, and return structured responses. Logging must preserve traceability while protecting user data, and payloads should be internationalisation-ready. Before starting, I’d like to clarify: 1, Do you have the language API credentials and any rate limits we should design around. 2, Preferred session storage (DynamoDB, S3, or in-memory caching) for persistence. 3, Should logs be CloudWatch-only or include optional dashboards/alerts. Our team can deliver infrastructure-as-code (SAM or CDK), fully working backend flows, session management, secure logging, and detailed documentation for configuration and extension. Milestone-based delivery with short check-ins ensures smooth progress and quick iteration. The current bid is a placeholder to start the conversation. Regards Yasir LEADconcept PS: Let me know, if you want to see our team past work to determine our skills/expertise or past customer's references.

@corpmember29

I’ve built multiple **mobile-first, low-latency backends on AWS** using Lambda and API Gateway, with a strong focus on clean interfaces, predictable responses, and UX-sensitive behavior—exactly what your private beta needs. **How I’d approach this backend:** * **Serverless architecture** using AWS Lambda + API Gateway with clear, versioned endpoints * **Session-based conversation handling** (DynamoDB or Aurora Serverless) with TTL-based expiration * **Real-time voice/text ingestion** with safe, resilient integration to third-party language APIs (timeouts, retries, graceful fallbacks) * **Structured response contracts** to keep frontend behavior deterministic * **Privacy-conscious logging** (request tracing without storing raw voice/text payloads) * **i18n-ready payloads** (UTF-8, language metadata, no hard-coded strings) **Deliverables covered:** * Infrastructure-as-code (SAM or CDK) deployable to your AWS account * End-to-end working conversation flow (voice + text) * Session persistence across refresh with defined expiration behavior * Debug-friendly, privacy-safe logging * Clear README with setup, configuration, and extension points * Meaningful test coverage for core flows I value **clarity over over-engineering**, write maintainable systems, and work well with **milestones and short check-ins** to keep things aligned during beta iteration.

@MobiStudioz

Hi there, I can architect and implement a reliable, low-latency, serverless backend on AWS to support your private-beta, mobile-first conversational web application, with a clear focus on stability, clean interfaces, and UX-sensitive behavior. I understand the frontend is already in place and this engagement is strictly backend and infrastructure focused. The objective is to enable real-time voice and text interactions with predictable responses, strong session handling, and privacy-conscious observability, optimized for iterative beta learning rather than unnecessary scale. I represent Foxy Technologies, a product-focused engineering company with 48 in-house professionals experienced in AWS-native architectures, real-time API integrations, and beta-stage systems that evolve through rapid feedback cycles, much like how consumer apps in India iterate quickly around high-engagement events such as IPL seasons or festival traffic spikes. To align execution efficiently, kindly share: - The preferred third-party language or voice processing API - Your target AWS region and account readiness Any expected beta usage constraints or session limits Kindly initiate a chat so we can finalize milestones, define a delivery roadmap, and move toward a stable private-beta release. Looking forward. Regards, Chandan S Foxy Technologies

@shrec

I have extensive experience building serverless backends on AWS using Lambda, API Gateway, and related services, and can deliver a reliable, low-latency system for your real-time voice and text interactions. I will implement session-based conversation handling with automatic expiration, structured responses, privacy-conscious logging, and internationalisation support, all deployed via IaC (SAM/CDK) for easy iteration. Clear documentation, test coverage, and graceful error handling will ensure the backend is maintainable and easy to extend as your private beta evolves. I’m ready to collaborate with your frontend team, delivering incremental milestones for transparency and fast feedback.

@diektech

Hi, This is Elias from Miami. I’ve checked the scope and I understand you already have the mobile-first frontend and now need a serverless AWS backend for short, real-time voice/text conversations. The focus is reliability and UX-sensitive behavior: Lambda + API Gateway, session handling with expiration, integration to your language API, structured responses, and privacy-safe logging — not heavy scale engineering. I can build this with IaC (SAM/CDK) so it deploys cleanly to your AWS account, with clear boundaries: event-driven endpoints, session store, retries/fallbacks, and UTF-8 international payloads. I’ll keep the design simple and predictable so the beta can evolve without fragile plumbing. Additionally, a few questions: Q1: For session persistence, should we use DynamoDB TTL or ElastiCache, and what’s your target session lifetime? Q2: Does voice input arrive as audio files or already transcribed text from the client? Q3: Do you need per-user rate limits or anonymous access during private beta? Deliverables will include full IaC, working flow, traceable logging without PII, and a clear README with extension points. I’m comfortable with milestone-based check-ins to keep things aligned. Looking forward to hearing from you. Regards.

@neerajdhameliya

Hello, I am a backend developer with strong experience in building reliable, low-latency serverless systems on AWS. I have worked on several projects using AWS Lambda + API Gateway, including real-time apps that handle external API integrations, session management, and clean error handling. Your project matches my skills perfectly: => Event-driven Lambda functions behind API Gateway => Integrating third-party language processing APIs for voice/text input => Session-based conversations with auto-expiration => Privacy-safe logging and i18n-ready payloads => Infrastructure as code (I prefer AWS SAM or CDK) => Focus on reliability, good UX, clear docs, and basic tests I can deliver: => Full backend setup deployed to your AWS account => Working end-to-end flow for basic voice/text conversations => Session persistence (e.g., using DynamoDB or similar) with expiration => Traceable logging without sensitive data leaks => Clear README for future changes I am available to start right away and can share past work or hop on a quick call to discuss details. Looking forward to your reply! Best regards, Niral

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in Linux, Mobile App Development, Amazon Web Services, Debugging, Node.js, Backend Development, Documentation, AWS Lambda, API Development, API Integration and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.   Best regards, Sales department Tangram Canada Inc.     

@rahuliitm69

Hi there, I can help you build a clean, reliable serverless backend on AWS for your voice- and text-based conversational app. I’ve worked on real-time systems where low latency, predictable responses, and good error handling matter more than scale or buzzwords. I’ll set up AWS Lambda behind API Gateway, handle session-based conversations with proper expiration, and integrate the third-party language API in a way that keeps responses structured and consistent. I’ll deliver everything using infrastructure-as-code (SAM or CDK), along with clear documentation so it’s easy to deploy, test, and extend as you iterate. I’m comfortable working in milestones with quick check-ins to keep things aligned. If this sounds like what you’re looking for, let’s connect and walk through your current frontend flow and beta goals. Thanks, Rahul A.

@mrresearcher99

Hi there, I’ve reviewed your Node.js project requirements and would love to help. With 5+ years of experience in backend and API development, I specialize in building fast, scalable, and secure applications using Node.js, Express, and MongoDB. I’ll start with a clear architecture plan, provide regular progress updates, and ensure the solution is well-tested, efficient, and production-ready. Let’s connect to discuss your project in detail — I’m ready to get started! Best, Bhargav Node.js Developer | Backend & API Expert

@ludiac

Hello there, I can help you build a clean, low-latency serverless backend on AWS that’s reliable and easy to evolve during private beta. I have hands-on experience with AWS Lambda, API Gateway, external API integrations, session handling, and privacy-aware logging. I’ll deliver an event-driven backend with clear conversation state management, graceful error handling, and UTF-8/i18n-ready payloads, all deployed via SAM or CDK. You’ll get well-documented infrastructure, testable Lambda code, and a working end-to-end voice/text flow. I can start immediately and work with milestone-based check-ins. Thanks.

@pinkeegupta

Hi I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart and for web and backend on react js and node js, Python Django, Power BI, Scikit-learn, Data Science AI ML, PyTorch, TensorFlow, SparkML , java spring boot and php CodeIgniter mvc. Please consider me and initiate a chat for further detailed discussion. Regards, Anju

@MashoodurRehman1

I am a seasoned backend developer with significant experience in building serverless applications on AWS, including AWS Lambda and API Gateway. My work has involved integrating with third-party APIs to enable real-time interactions and supporting robust, low-latency backend solutions that prioritize reliability and user experience. I am adept at delivering privacy-conscious logging mechanisms suitable for iterations, while maintaining a focus on clean, maintainable interfaces. My expertise extends to Infrastructure as Code using AWS SAM, ensuring seamless deployment and management of applications within cloud environments. I have successfully handled session persistence, structured response systems, and internationalization-ready payloads, aligning well with your project's requirements. My approach involves prioritizing thoughtful error handling and maintaining clarity in documentation and test coverage to facilitate smooth adaptation during beta testing. I am interested in discussing how I can contribute to building your mobile-first conversational app. Could you share more about the language processing API you plan to use? Looking forward to your response.

@ciss26

Hello, I hope you are doing well. I understand that you are looking to build a MOBILE APPLICATION and I would be happy to help. I have extensive experience in designing and developing Application and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.

@nikhilgarg96

As an experienced full-stack developer, I will bring a breadth of skills and valuable perspective to this important project. I am quite comfortable working with AWS Lambda and API Gateway and am adept at integrating external APIs into real-time flows. My previous projects involving CRM and ERP systems required profound attention to detail, combining a deep understanding of software development with strong problem-solving skills - both of which will be critical for your conversational app. I value clean, maintainable interfaces which is why I frequently document my codes, write clear READMEs and ensure comprehensive test coverage. Your project's focus on reliability, clarity, and UX-sensitive behavior aligns perfectly with my development philosophy. With a demonstrable track record in mobile app development using Node.js, I'm confident that I can quickly get up to speed with this backend-focused project. Thanks....

@rbtech1984

Hi There!!! ⚜⭐⭐⭐⭐⚜(( Serverless AWS backend for real-time voice and text conversations ))⚜⭐⭐⭐⭐⚜ Your app needs a low-latency, reliable backend that handles voice and text input, integrates with a language processing API, and maintains session-based conversations with clean expiration. The focus is on clarity, predictable responses, and privacy-conscious logging rather than massive scale. I have strong experience building AWS Lambda + API Gateway backends, integrating third-party NLP APIs, and delivering clean infrastructure-as-code deployments. I will design a session model with expiration, implement robust error handling and retries, and ensure logs remain traceable without exposing sensitive user data. Mini strategy: use API Gateway for routing, Lambda for processing, DynamoDB for session persistence, and structured responses with UTF-8 internationalisation support. Three key features: 1. Session-based conversation with automatic expiration 2. Secure third-party API integration with retries 3. Privacy-friendly logging and clear response schema If you want, we can discuss the exact NLP API and session rules to start with a clear milestone plan. Warm Regards, Farhin B.

@JijoThomas2020

I am a great fit since have worked on many mobile apps, so I would deliver the quality work according your requirements. Looking forward to your message. Thank you, Jijo T

@DigitaSyndicate

⚠️You are not looking for a coder. You are looking for someone who can build this properly. That is exactly why your project stood out.⚠️ Your aim to create a reliable, low-latency, serverless backend on AWS that seamlessly ingests voice and text inputs reflects a commitment to clarity, user experience, and thoughtful system design. This aligns directly with how we approach backend architecture at DigitaSyndicate. At DigitaSyndicate, a UK-based digital systems agency, we build precision-engineered, scalable serverless systems and automation tailored for performance and long-term reliability. Our expertise with AWS Lambda, API Gateway, and third-party API integrations ensures your conversational backend will be robust, secure, and maintainable, with infrastructure-as-code deployments and privacy-conscious logging integral to our deliverables. We recently delivered a session-based conversational backend with graceful error handling and full traceability. Can you share your main priorities and timeline so I can map out the right execution plan for you? Casper M. Project Lead | DigitaSyndicate Precision-Built Digital Systems.