Voice AI developer- inbound and outbound calls -- 2

@umer6316326

Dear , I hope this message finds you well. My name is Umer Hayat, and I am a full-stack PHP developer with over 8 years of experience in developing, customizing, and maintaining PHP-based websites for various clients. I have reviewed your project requirements and would like to ask a few clarifying questions to ensure that I can meet your expectations. I believe a brief chat would be the best way to proceed. Here is an overview of my skill set: Core PHP Laravel (PHP MVC Framework) CodeIgniter (PHP MVC Framework) WordPress (PHP CMS) Shopify (PHP CMS) Custom APIs and scripts Telemarketing, Asterisk PBX, AI Development, Transcription, VoIP, PHP, API Integration, Technical Documentation and Natural Language Processing I look forward to discussing your project in more detail. Please feel free to reach out at your convenience. Thank you. Best regards, Umer Hayat

@arzoof1

Hello I have built production Voice AI systems using Vapi.ai-style platforms with Twilio for both inbound 24/7 call handling and high-volume outbound campaigns, including interruption-aware conversations, live human transfers, voicemail detection, SMS follow-ups, CRM logging, and direct calendar booking. I am comfortable wiring LLMs (OpenAI/Claude), STT/TTS pipelines, webhooks, and modular logic so scripts and flows can be updated without redeployments, while keeping per-minute costs optimized and reliability high. I think in terms of scale, fail-safes, and clean call routing—not demos—and can follow a technical spec precisely from day one. Best Regards, Arzoo Farooq

@Sohail748

**Hi there,** I’m offering a 25% discount for this project. With expertise in conversational AI and telephony integration, I will develop a comprehensive Voice AI system capable of handling both inbound customer service calls and outbound proactive calls (appointment reminders, surveys, etc.). I specialize in building solutions using platforms like Twilio, AWS Connect, or custom VoIP stacks, integrated with speech recognition (ASR) and synthesis (TTS) engines to create natural, efficient voice interactions. The process includes designing the call flow logic and conversation scripts, developing the backend AI to process speech and manage dialogue, integrating with telephony APIs, and implementing features like call recording, analytics, and seamless handoff to human agents. I will focus on creating a reliable, scalable system that improves call center efficiency. You’ll receive a fully functional Voice AI system for inbound and outbound calls, complete with source code, deployment scripts, and documentation. My goal is to deliver an automated telephony solution that enhances customer experience and optimizes your communication workflows. Best regards, Sohail

@Mahihassi

As an experienced Software Engineer, I offer a unique combination of skills that make me a perfect fit for your Voice AI and call automation project. My solid background in embedded systems and proficiency with firmware development would be particularly beneficial in handling the technical aspects of integrating AI into your telephony systems. I understand the importance of scalability and cost-efficiency in such projects, coupled with my Master's degree in Embedded Systems and deep understanding of C/C++ programming and Microcontroller-based projects, I am confident to meet your system requirements. While my past projects have primarily focused on embedded systems and IoT development, I have also dabbled extensively in API Integrations. This skill would prove particularly useful for implementing webhook-based API integrations, CRM integrations, and calendar booking integrations as outlined in your requirements. In addition to my technical capabilities, I pride myself on my strong communication skills and meticulous documentation practice. These traits would ensure smooth collaborative process and efficient transfer of knowledge as we work towards developing a reliable and scalable Voice AI system.

@GameOfWords

Voice AI developer- inbound and outbound calls I’m a full-stack software engineer with expertise in React, Node.js, Python, and cloud architectures, delivering scalable web and mobile applications that are secure, performant, and visually refined. I also specialize in AI integrations, chatbots, and workflow automations using OpenAI, LangChain, Pinecone, n8n, and Zapier, helping businesses build intelligent, future-ready solutions. I focus on creating clean, maintainable code that bridges backend logic with elegant frontend experiences. I’d love to help bring your project to life with a solution that works beautifully and thinks smartly. To review my samples and achievements, please visit:https://www.freelancer.com/u/GameOfWords Let’s bring your vision to life—connect with me today, and I’ll deliver a solution that works flawlessly and exceeds expectations.

@Ahmedh058

Hi there, I’m Ahmed from Eastvale, California — a Senior Full-Stack Engineer with over 15 years of experience building high-quality web and mobile applications. After reviewing your job posting, I’m confident that my background and skill set make me an excellent fit for your project — Voice AI developer- inbound and outbound calls -- 2 . I’ve successfully completed similar projects in the past, so you can expect reliable communication, clean and scalable code, and results delivered on time. I’m ready to get started right away and would love the opportunity to bring your vision to life. Looking forward to working with you. Best regards, Ahmed Hassan

@Zawiya3

With my extensive skills in PHP, Telemarketing and Vapi/Twilio integrations I am the ideal candidate for this project. I have a proven track record of successfully developing voice AI and call automation systems similar to the one described. Notably, my proficiency in Python which include areas of speech and text analysis make me uniquely suited to navigate the technicalities of inbound Voice AI or telephony projects like yours. Another strength that I bring to the table is an understanding of the importance of reliability, scale and cost efficiency for a project as sound as this, with its future growth on the horizon. My architectural expertise includes being able to design modular and scalable systems which not only ensure cost optimization but accommodate potential future expansions smoothly. Analyzing your project requirements deeply, it's clear that 'the devil lies in the details'. And my ability toothpaste ensure accurate representation of scripting logic and other specifics without redeployment is a significant added value that I can offer.

@mzdesmag

Hello sir, Did go through your job description and glad to share that I have enormous experience in working with Voice AI developer- inbound and outbound calls I'm a seasoned programmer and Engineer with quality experience in Flutter, React, Node.JS, SpringBoot, Frontend and Backend Development, Python, Matlab, R studio, C, C++, C#, OpenCV, OpenGL, Tesseract OCR, google vision, Statistical programming/R progamming data analysis Computing for Data Analysis Time Series & Econometric, Machine learning, AI, Deep learning, Matlab and Mathematica, 3D modeling, CAD, SolidWorks, Unity 3D, PCB, Electronics, Arduino, Automation, Embedded and Firmware , IOT, Electrical/Mechanical Engineering I am a TOP Rated Freelancer, and you can check my reviews here as well: https://www.freelancer.com/u/mzdesmag. Looking forward to potentially working together on this project. Thanks and Best regards, Adekunle.

@syedraza21295

Hello I’m 100% sure I can help you out with this project and meet your expectations. Let’s connect on chat and discuss the requirements in more detail. Lets connect in chat so that We discuss further. Thank You

@IhorDidur

Hello, I have carefully analyzed the project requirements and have built production Voice AI systems using Twilio, Vapi/Retell, OpenAI STT/TTS, webhook APIs, and CRM integrations (HubSpot, Airtable). In a recent project, I implemented inbound call routing, live human transfer, voicemail detection, SMS follow-ups, and dynamic scripts managed without redeployments. For your system, I will design a modular Twilio + Vapi architecture with intent-based routing, qualification logic, calendar booking, CRM logging, and cost-optimized STT/TTS pipelines. I will ensure interruption handling, reliable transfers, and scalable webhook orchestration with full documentation. I am available to start immediately and committed to delivering a stable Phase 1 build within the shortest possible timeframe. Best regards, Ihor

@sarimshoaib1425

Hey, I have had 2+ years of creating and selling AI voice callers on vapi, retell and now elevenlabs. I can genuinely assure you that all of the requirements written here are absolutely doable. Ready to wrap this up and get final end-to-end tested within a week!

@kirills31

Hey there, For outbound, are your leads strictly opt-in (TCPA compliant) and do you already have a sending number pool (A2P, brand registration) ready for SMS follow ups? Do you want the “configurable scripts and rules” stored in a DB (versioned flow configs) or edited in an admin UI and pushed to Vapi via API instantly? I’ve built Voice AI flows using Twilio plus Vapi style agents: inbound IVR style routing, interruption handling, live transfer, voicemail detect and drop, SMS follow ups, plus webhook logging into CRMs and calendar booking. The main challenges are latency, barge-in tuning, transfer reliability, and preventing duplicate events across webhooks. For Phase 1 I would ship: inbound 24/7 agent, intent routing, lead qualification, calendar booking, missed call SMS, transcripts summaries, and CRM logging with replay safe webhooks. Cost reduction ideas: use short prompts, cache context, use cheaper STT for non critical steps, only stream TTS when needed, and record after connect only. Hope to discuss more on chat. Best, Kirill

@QuickMentor

Voice AI developer- inbound and outbound calls -- 2 I bring years of experience in content and academic writing, ensuring clear, engaging, and well-researched work every time. I’m reliable, fast, and fully committed to delivering results that truly stand out. Your Project Deserves Expert Writing I craft polished, reader-focused content tailored exactly to your requirements. With strong research skills and a commitment to excellence, I guarantee quality, originality, and timely delivery. Your project will get clear communication, fast turnaround, and exceptional results. Explore My Work and Achievements: https://www.freelancer.com/u/QualityHub Let’s connect and bring your project to life—I’m just a message away!

@irazon15

I build production‑grade Voice AI systems, not demos. I’ve shipped inbound and outbound call flows using Twilio + Vapi‑style stacks, integrating LLMs, STT/TTS, webhooks, CRMs, and calendar booking with real interruption handling, live transfers, and SMS follow‑ups. I focus on reliability, call quality, and cost control—clean routing logic, modular prompts, configurable scripts, and detailed call summaries synced to CRM. I can start immediately, follow your specs precisely, and support this as a long‑term platform, not a one‑off build.

@dominicd28

Dear Client, Good afternoon . I hope this proposal finds you well. This is to inform you that I have KEENLY gone through your project description, CLEARLY understood all the project requirements as instructed in your project proposal and this is to let you know that I will perfectly deliver as desired. Being in possession of all stated required skills, (Telemarketing, Natural Language Processing, VoIP, Asterisk PBX, Transcription, PHP, API Integration, AI Development and Technical Documentation), as this is my field of professional specialization having completed all certifications and developed adequate experience in the respective field, I hereby humbly request you to consider my bid for professional, quality and affordable services that meet all your requirements. I always guarantee timely delivery and unlimited revisions where necessary hence you are assured of utmost satisfaction when working with me. Please send me a message so that we can discuss more and seal the project. WELCOME.

@jessev08

Hi, I’ve worked on projects like this before, so what you’re describing makes sense to me. And I'm really interested in this project - Voice AI developer- inbound and outbound calls -- 2. I usually focus on getting things done cleanly and making sure they work properly in real use, not just on paper. I’m comfortable either improving an existing setup or helping build something new, depending on what stage you’re at. I keep communication straightforward, share progress along the way, and flag issues early so there are no surprises later. If you want, you can share a bit more about the current setup or the goal you’re trying to reach, and I can let you know how I’d approach it. Thanks, Jesse

@VitaliiDem

Hi I'm an AI and full stack developer I have rich experience in AI real-time voice agents (inbound and outbound call) I used vapi and retellai + twilio. I can start right now and I can deliver a good result. I'm looking forward to work with you. Thank you

@alizain721

Hello, I have built Voice AI systems where the real work is telephony reliability, call state, and clean handoffs, not just prompting. Your scope reads like a production system with inbound routing, qualification, booking, transfers, and outbound at volume, so I would treat this as an engineered call platform, not a demo. For relevant work, I have done Twilio based inbound call handling with webhook driven logic, live transfers, recordings, transcripts, post call summaries, and CRM logging, plus outbound flows with voicemail detection and SMS follow ups. Tooling wise I’m comfortable with Twilio, Vapi style voice agents, OpenAI or Claude, and STT TTS pipelines, and I have integrated calendars and CRMs like Airtable and HubSpot through webhooks. Timeline wise, Phase 1 inbound system is typically 2 to 4 weeks for a deploy ready build depending on how complex your routing and qualification rules are, and I can start this week with steady availability. To improve call quality and reduce per minute cost, I usually focus on shorter agent turns, early intent routing, selective transcription, caching common responses, and using lower cost models for classification while reserving larger models for edge cases. If you share the spec, I can suggest a clean architecture and cost plan before coding. Thanks! A. Zain!

@riogushiken1114

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