Hire the Best Voice Assistant Developers

Clients rate our Voice Assistant Developers
Rating is 4.9 out of 5.
4.9/5
Based on 2,010 client reviews
Sheree F.

Lara, Australia

$64/hr
5.0
10 jobs

Research projects Voice recording contracts for AI Business management Social media manager Accounting book keeping Setting up social media accounts and managing them or teaching you Advertising and marketing strategies Managing hair and beauty salons Administration Recruitment and interviewing Phone work and appointment setting People skills Assistant management Personal assistant Call centre Customer service Virtual employment Training apprentices and vcal students Online tutor teaching english Voice over work eg ebooks, navigational devices etc Beta tester App better tester User experience testing

  • Receptionist Skills
  • Voice Acting
  • Voice Talent
  • Sales & Marketing
  • Social Media Management
  • Social Customer Service
  • Social Media Account Setup
  • Social Media Advertising
  • Voice-Over
  • Voice Recording
  • Female Voice
  • Research Methods
  • Research Interviews
  • Advertising
  • UserTesting
  • User Experience
  • User Flow
  • Beta Testing
  • User Acceptance Testing
  • DApps User Experience
Yasmin Guadalupe P.

Merida, Mexico

$20/hr
5.0
3 jobs

Hello! I’m Yasmin, a creative virtual assistant with experience in organization, design, digital communication, and voice acting. I have experience managing data, organizing documents, and providing reliable administrative support. I also create engaging visual content (images, videos, and social media posts), ensuring every project looks professional. Additionally, I have experience in voice acting. I have participated in recording projects for AI training, performing multiple characters and adapting tone, emotion, and vocal style, delivering high-quality audio under technical specifications. My skills include: • Data entry, transcription, and document organization • Graphic design and image editing • Social media content creation and management • Video editing • Voice-over recording and voice acting I am a detail-oriented, creative, and versatile professional, committed to delivering high-quality results. I would be happy to collaborate with you!

  • Voice Acting
  • Data Entry
  • General Transcription
  • Virtual Assistance
  • Market Research
  • Facebook Marketplace
  • Narration
  • Audiobook Narration
  • Illustration
  • Drawing
  • Nature Illustration
  • 2D Illustration
  • Animal Illustration
  • Voice Recording
  • Voice-Over Recording
  • Female Voice
  • Smooth Voice Tone
Megan R.

Truganina, Australia

$25/hr
5.0
58 jobs

I'm a professional Australian freelancer with experience in AI data work, voice recording, research project management, and teaching English. My background includes projects involving data annotation, audio transcription, text classification, and image labelling, supporting the development of accurate, high-quality machine learning datasets. I work carefully with detailed guidelines and aim for consistent, reliable output. I also work as a project manager supporting qualitative and quantitative research studies. This includes coordinating recruitment and scheduling, managing quotas, handling participant communication, tracking attendance and incentives, and keeping projects organised so sessions run smoothly and deliverables stay on track. I regularly take on voice recording tasks, including natural language prompts, scripted dialogue, and training data for speech models. I speak with a clear Australian accent and deliver recordings that meet a range of project requirements. As an English instructor, I offer personalised lessons to learners of all levels, focusing on conversation, pronunciation, exam prep, and professional communication. I’m fluent in English and Portuguese, with intermediate French, and comfortable contributing to multilingual or language-based projects. I bring professionalism, attention to detail, and strong communication to every project. If you’re looking for a dependable, adaptable freelancer, I’d be happy to support your work.

  • Voice Acting
  • Voice Talent
  • Artificial Intelligence
Luiza C.

Porto Alegre, Brazil

$8/hr
5.0
40 jobs

With a gentle and sweet voice, I work as a voice over on several projects at Upwork, ranging from recordings to software development in Artificial Intelligence, dubbing for children's videos on Youtube as well as narration for various videos. If you need an expressive voice, that can transpose emotions through the script to be read, smoothness and clarity, that person is me. It will be a pleasure to be able to make a difference in your project. Let's talk?

  • Brazilian English Accent
  • Voice-Over
  • Female
  • Brazilian Portuguese Dialect
  • Middle-Aged Adult
  • Narration
  • Voice-Over Recording
  • Artificial Intelligence
Astra K.

Bisbee, Arizona

$75/hr
5.0
16 jobs

Hi! I am an experienced and versatile VO artist and have been working in the industry since I got my start in radio in 2005. I have voiced commercials for radio/TV, meditations, narration, animations, as well as e learning, AI training, explainer videos, and technical modules. I've also managed numerous recording studios where I was the first call for VO clients. My goal is always to work with you to find the perfect voice for your project! As a singer, I clearly understand the importance of dynamics, vocal pacing and intensity and I’m able to adjust as needed. I have a professional home studio and ample experience with audio recording, editing, and synch to video. I am a quick read and am able to provide fast turn around and file delivery with impeccable communication and attention to detail. I look forward to working with you! Project Highlights: ~ Something About Melvin: I am the voice for a male rescue cat who entertains, advocates, and educates on issues facing street cats and those who care about them. ~ Lexus: Voiced promotional elements for their "Lexus Culinary Masters" series. ~ Radio ads for clients such as: Southwest Airlines, REI, Starbucks, Motel 6, and more! Testimonials: “We have used Astra’s voice over talents on several of our Computer Based Training development projects. Her talent and ability enables her to articulate accurate narration sound bytes with little to no editing. We have received numerous compliments from our customers on the quality of the voice heard on our product. It is truly a pleasure to work with such a professional as Astra.” Michael Fernandez Technical Services Group
ARINC Engineering Services, LLC San Diego. CA “When we want a friendly, professional female business voice - Astra Kelly is our choice. She’s an absolute delight to work with, comes prepared, takes direction with a smile, and delivers what we need with speed and precision.” Robert John Hughes Chief Strategy Officer ChangeWell Training Academy

  • Voice Acting
  • Voice Talent
  • Singing
  • Voice-Over
  • Lyrics Writing
  • Songwriting
  • Audio Editing
  • Audio Recording
  • Video Editing
  • Audio & Video Sync
  • Vocal Coaching
  • Voice-Over Recording
  • Female Voice
  • Voice Recording
Anya T.

Kingston, Jamaica

$25/hr
5.0
3 jobs

I help bring characters alive, and capture the heart of the listener with my delivery. I also help businesses deliver exceptional customer experiences while protecting revenue and maintaining strong client relationships. I offer voice-over and narration services, delivering clear, engaging, and professional audio for audio books, faceless videos, business communications, explainer content, and customer-facing recordings. I have trained and transformed my tone and dilect to be fun, convincing, and immersive in my speech and delivery, with excellent cadence and engaging delivery. I find emmense pleasure in using my skills effectively to bring characters and storylines alive. I take voice over inspiration from a host of brilliant narrators in Abby Craden, Scott Brick, Dan Morgan, Allison Mclemmore, Harry Lloyd, Roy Dotrice,and others,. These professionals have taught me the art of transporting the audience directly into the storyline, immersing them palpably into the various, and distinct lives of characters. I am therefore excited for an opportunity to join your team, doing my part in bringing your project to life to reach, assure and impact your audience. With over 11 years of experience in customer service, technical support, and collections, I bring a results-driven approach to every interaction. My strength lies in communication. I know how to listen, de-escalate, and guide conversations toward solutions that satisfy both the customer and the business. Whether through email, live chat, or phone support, I maintain a professional tone, clear delivery, and a focus on resolution. What I can support you with: Voice Over & Audio Narration Customer Support (Email, Chat, Phone) Technical Support (Tier 1 & Tier 2) Billing & Dispute Resolution Collections & Payment Follow-Ups Customer Retention & De-escalation CRM Management & Documentation Virtual Assistant (Customer-Focused Tasks) I am reliable, detail-oriented, and focused on delivering results that improve both customer satisfaction and business performance. I create win win interactions where the customer is satisfied and, while protecting the firm'simage. I pride myself remaining calm under stressful conditions, and ensuring that the customer's concern is understood and dealt with in a friendly, professional and prompt manner. I learn and understand new products and ideas easily, beause I'm hungry for growth , so that I can in turn provide exceptional service and build upon my accomplishments. These past experiences and attributes I know are valuable assests to the success of your project and I would love to be apart of such an adventure to ensure that we both benefit from such rich desires and ambtions. Words are my passion, to indent my signature in a good book or in the listener's mind, or to spill my mind all over a white canvas, bringing a dead tree back to life in poetic order intermingled with savory chaos is my purpose. Whether a captivating 20 sec video or a 10hr thought provoking, reality escaping audiobook, or even a mouth watering poem written in free verses to free or ease the mind, a "sonnet" to twist your wandering heart, or a "Carpe Diem" that sends you through the phases of time, allow me to enrapture your audience, I will make you and them beg for more, the experience of climbing any mountain, drowning in any ink-filled ocean, soaring above every satire to find content that leaves even the most lost, stringent or free in hopeless bliss. I breathe pride into these skills and their fiery breaths do not waiver, whether novels for the soul, poetry for the parched mind, stories for the dreamer, I voice will re-arrange your imagination and feed your hunger for brilliance, for more. I sharpen my skills constantly and I currently take voice acting classes as convining storytelling is starting to become a lost art form. I welcome your mind into the vocal heart that is my own, of one of few remaining dedicated artists who continues to evolve in her ART.

  • Voice Acting
  • Online Chat Support
  • Customer Support Plugin
  • Data Entry
  • Chat & Messaging Software
  • Email Communication
  • Creative Writing
  • Songwriting
  • Storytelling
  • Story Writing
  • Story Editing
  • Customer Retention Strategy
  • Technical Support
  • QA Management
  • Troubleshooting
  • Audio Recording
  • Voice Recording
  • Phone Support
  • Debt Collection
  • Accuracy Verification

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Don't just take our word for it

Hire the Best Voice Assistant Developers

Voice assistant developers create the technology that enables devices to process and react to spoken language. They work in nearly every industry, helping clients build and integrate software to, for example, enhance their customer self-service with AI assistance, build multimodal in-car experiences, add hands-free features to legacy systems, and much more.

Upwork connects clients with skilled freelance professionals who design, build, and optimize voice-activated systems for a range of applications and platforms. No matter where you are in the development stage — from planning something brand new to integrating new features in an already existing app — the right developer can help you ship faster and with higher quality.

What does a voice assistant developer do?

A voice assistant developer builds the software that allows devices to process speech and generate an appropriate response. For example, they create the voice-activated systems in smart speakers, cars, and customer service applications, blending programming with the principles of conversational design. Their work spans speech recognition, natural language processing, natural language understanding (NLU), dialog management, integrations, and analytics — and they often collaborate closely with design, engineering, data science, and product teams.

Core responsibilities of a voice assistant developer often include:

  • Designing conversational flows. They map out how users will interact with the voice assistant to create natural dialogue paths.
  • Developing speech recognition systems. They can build features that are trained to accurately process different accents, languages, and speaking styles.
  • Integrating with APIs and databases. They connect voice assistants to business systems, enabling them to retrieve information or complete tasks.
  • Testing and optimizing performance. They refine the assistant's ability to interpret user intent and provide accurate responses.
  • Creating platform-specific applications. They can develop skills for Alexa, actions for Google Assistant, or custom voice solutions.

Additional tasks a developer may handle include:

  • Wake word and endpointing. Implementing reliable wake word detection and turn-taking logic to minimize false activations and cutoffs.
  • Natural language generation (NLG). Crafting concise, conversational responses and leveraging templates or models for dynamic content.
  • Text-to-speech (TTS) tuning. Selecting voices, managing SSML for prosody and emphasis, and balancing cost, latency, and quality.
  • Multimodal support. Coordinating voice with visual responses for devices with screens, including cards, lists, and on-screen prompts.
  • Internationalization and localization. Supporting multiple languages, locales, and cultural norms across prompts, intents, and error handling.
  • Accessibility. Designing inclusive experiences for users with speech, hearing, cognitive, or motor differences.
  • Analytics and A/B testing. Instrumenting events, defining success metrics, and running experiments to improve completion rates.
  • Security and privacy. Handling permissions, sensitive data, and compliance requirements while minimizing data retention.

How do I hire a voice assistant developer on Upwork?

Hiring a skilled voice assistant developer on Upwork is a straightforward process. The platform offers tools designed to help you find and connect with the right independent talent for your project.

Step 1: Define your voice assistant project scope

A clear job post helps attract qualified freelance developers. Upwork's Job Post Generator can create a solid first draft, and our AI developer job description template offers further guidance.

A strong job post often includes:

  • Project objectives. Describe what the voice assistant should accomplish.
  • Target platform. Specify if you need an Alexa skill, Google Assistant action, or custom solution.
  • Required features. List functionalities like multi-language support or payment processing.
  • Technical requirements. Mention any specific programming languages, like Python or Node.js.
  • Timeline and budget. Provide clear expectations for project duration and compensation.

Optional details that help developers estimate accurately:

  • User scenarios and success criteria. Example utterances, target completion rates, and acceptable error thresholds.
  • Data sources and integrations. APIs, authentication methods, and any third-party services.
  • Compliance and security constraints. Data handling rules, PII sensitivity, and audit needs.
  • Analytics and KPIs. How you plan to measure usage, satisfaction, and containment.

Step 2: Browse and evaluate voice assistant developers

As proposals arrive, review candidates and create a shortlist. Key qualities to review include:

  • Portfolio examples. Review their previous voice application projects.
  • Job Success Score (JSS). A high JSS indicates a history of positive client outcomes.
  • Client reviews. Read feedback about their communication, technical skills, and project delivery.
  • Talent badges. Look for Top Rated, Top Rated Plus, or Expert-Vetted badges that signify proven expertise.
  • Relevant skills. Check for experience with natural language processing and voice platform SDKs.

In addition, depending on your specific need, you may want to ask about:

  • Depth vs. breadth. Look for evidence of end-to-end delivery — design, build, test, and launch — not just prototypes.
  • Domain familiarity. Many fields — such as customer service, finance, healthcare, or retail — benefit from someone with domain-specific knowledge.
  • Quality signals. Automated tests for intents, slot validation, and regression coverage help ensure stability.
  • Communication. Strong candidates proactively clarify requirements and propose practical alternatives.

Step 3: Interview top candidates

Interviewing your top choices helps assess their technical skills and communication style. You can schedule interviews through Upwork messaging, or use instant interviews to quickly give you an objective, rated metric of your top choices.

Key interview topics include the developer’s technical approach, platform experience, and testing processes. Sample questions to ask include:

  • What do you consider your core skills?
  • Tell me about a time you proactively addressed a client's need.
  • What is your approach to NLU?
  • How do you handle latency and reliability? 
  • How do you manage security and privacy? 
  • What is your approach to testing? 

For a quick expert opinion, you could also book a paid consultation to discuss your project with a developer.

Step 4: Start your voice assistant project

Once you've chosen a developer, send a contract offer through the Upwork platform to manage the entire project in one place.

Getting your project started involves a few key actions:

  • Choose your contract type. Select an hourly contract or a fixed-price project.
  • Set clear milestones. Break larger projects into phases with specific completion criteria.
  • Establish communication cadence. Agree on regular check-ins and preferred communication channels.
  • Use Upwork's collaboration tools. Communicate through Upwork messages, share files securely, and track time.
  • Process payments safely. Upwork handles invoicing and payment protection for clients and freelancers.

How much does hiring a voice assistant developer cost?

The cost of hiring a voice assistant developer depends on project scope, developer experience, and your timeline. Understanding AI developer costs can help you budget, as these roles often overlap. The following table shows typical project costs on Upwork.

Basic Voice Skill

$500-$2,000/project

Entry to Mid Level
  • Simple Alexa skill
  • Basic FAQ bot
  • Single-function assistant

Custom Voice Application

$2,000–$10,000/project

Mid to Senior Level
  • Multi-feature voice app
  • Database integration
  • Custom NLP models

Enterprise Voice Solution

$10,000+/project

Senior or Specialist
  • Complex workflows
  • Multiple system integrations
  • Advanced AI features

Ongoing Development

$2,000–$8,000/month

Mid to Senior Level
  • Regular updates
  • Performance optimization
  • Feature additions

Voice Strategy Consulting

$150–$500/hour

Expert Level
  • Architecture planning
  • Platform selection
  • Team training

Developer location and platform choice also influence rates. On Upwork, you can use hourly contracts with Hourly Payment Protection or fixed-price projects with milestones for payment flexibility.

What affects cost beyond scope and experience:

  • Platform mix. Building for Alexa, Google Assistant, mobile (iOS/Android), or embedded systems can change complexity and testing needs.
  • Custom AI. Training custom NLU or acoustic models requires data, experimentation, and MLOps overhead.
  • Integrations. Connecting to CRMs, ERPs, e-commerce platforms, or proprietary systems often adds discovery and security review time.
  • Compliance. Requirements such as SOC 2, HIPAA, GDPR, or COPPA may affect design, logging, deployment, and documentation.
  • Performance targets. Tight latency budgets or high availability can drive infrastructure and optimization costs.
  • Content and localization. Scripting, prompt design, SSML tuning, and translation can be material line items.

Frequently asked questions

Is hiring a voice assistant developer worth it?

Yes, hiring a voice assistant developer is worth it if you need to incorporate voice assistant features into your software, for example to improve customer service efficiency or create new ways for users to interact with your products. A well-designed voice experience can reduce support costs, increase engagement, and make key tasks more accessible and convenient.

How long does it take to develop a voice assistant?

A simple voice skill might take a few weeks, while a complex, custom voice assistant with multiple integrations could take several months to develop. Timelines also depend on content readiness, integration complexity, compliance needs, and the number of supported languages.

What skills should I look for in a voice assistant developer?

Look for a developer with strong programming skills in languages like Python or Node.js, experience with natural language processing (NLP) and AI virtual assistants, and familiarity with major voice platforms. Bonus skills include analytics, A/B testing, SSML proficiency, accessibility best practices, and knowledge of cloud infrastructure.

Can voice assistant developers integrate new programs with my existing systems?

Yes, skilled developers can use APIs to connect voice assistants to your current business systems, such as customer relationship management (CRM) systems, AI in e-commerce applications, and internal databases.

Do I need custom AI models for good results?

No, you don’t always need custom AI models to achieve good results. Many successful assistants use off-the-shelf ASR/NLU with careful conversational design, clear prompts, and robust error handling. Custom models help when you have specialized terminology, strict latency targets, or unique acoustic environments.

How do I ensure privacy and security?

To ensure privacy and security, define data handling rules up front, minimize sensitive data capture, and use encryption in transit and at rest. Work with developers who follow least-privilege access, redact logs, and document compliance controls suitable for your industry.

What ongoing maintenance is required?

Expect periodic content updates, prompt refinements, dependency upgrades, and retraining (if you use custom models). Plan for quarterly reviews of analytics and user feedback to keep performance and satisfaction high.

What metrics should I track after launch?

Monitor intent coverage, fallback rates, task completion, average turns per task, latency, and user satisfaction. Use these insights to prioritize improvements that reduce friction and increase containment.