Hire the Best FullContact Specialists

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Nikolay S.

Sharjah, United Arab Emirates

$40/hr
4.9
145 jobs

LiveKit, WebRTC, SIP/VoIP, Electron, AI, video, audio, real-time software development at scale. 600M+ AI call minutes a month (Nucleus). $10M+ ARR EdTech (BrainCert). Enterprise VMS surveillance for 50,000 users (VALT). ๐—™๐—ฟ๐—ฒ๐—ฒ ๐—ฃ๐—ฅ๐—— ๐—ณ๐—ผ๐—ฟ ๐—ป๐—ฒ๐˜„ ๐—ฝ๐—ฟ๐—ผ๐—ท๐—ฒ๐—ฐ๐˜๐˜€, ๐—ณ๐—ฟ๐—ฒ๐—ฒ ๐—ฐ๐—ผ๐—ฑ๐—ฒ ๐—ฟ๐—ฒ๐˜ƒ๐—ถ๐—ฒ๐˜„ ๐˜„๐—ถ๐˜๐—ต ๐—ถ๐˜€๐˜€๐˜‚๐—ฒ ๐—ฟ๐—ผ๐—ผ๐˜๐˜€ ๐—ผ๐—ฟ ~๐Ÿฑ๐Ÿฌ๐—ต ๐˜๐—ฟ๐—ถ๐—ฎ๐—น - ๐—ณ๐—ผ๐—ฟ ๐—ฒ๐˜…๐—ถ๐˜€๐˜๐—ถ๐—ป๐—ด ๐—ผ๐—ป๐—ฒ๐˜€. I'm the CEO of Fora Soft, and personally architect every project. You get an owner accountable for delivery and senior judgment from day one, not a junior learning WebRTC on your budget. โš ๏ธ DM or invite me - I respond within 2 hours. WHAT I'VE BUILT (selected): โ†’ SpeedSpace (LiveKit) - remote video production on LiveKit, WebRTC, and FFmpeg. Makes content for Netflix, HBO, and Electronic Arts. Shown at Paris Fashion Week. โ†’ Nucleus .com (SIP/VoIP) - WebRTC and SIP business phone system for the Canadian telecom Fibernetics. 600M+ call minutes a month, 5,000+ businesses, AI voice agents, SOC II, HIPAA. โ†’ FRP.live (Electron) - desktop and AI music platform. 720,000+ licensed tracks from Sony, Universal, and Virgin. Used by 12,000+ DJs. โ†’ VocalViews .com (WebRTC) - research platform with 1M+ participants, used by Samsung, McDonald's, Google, Netflix, TikTok, Adobe. โ†’ Tyxit .com (Electron, audio) - Electron desktop app for sub-30ms live music. Performed at the Montreux Jazz Festival. $1.3M raised, partnered with Karmine Corp. โ†’ VALT ipivs .com (Wowza, WebRTC) - video recording, streaming, surveillance SaaS platform. 770+ US organizations, 2,500 IP cameras, 50K+ users. From $1M revenue in the launch year to $9.7M now. 12 yearsโ€™ partnership. โ†’ Live Eye (Electron) - AI retail surveillance. 10K+ locations, $5M+ fraud prevented. โ†’ BrainCert .com - the first HTML5 + WebRTC virtual classroom. 100K+ customers, 500M+ classroom mins. โ†’ Sprii - โ‚ฌ365M+ in live commerce sales. 72K+ live events. โ†’ StreamLayer - interactive sports overlays, $14.1M raised. NBC, CBS, Red Bull, Chelsea FC. PROBLEMS I SOLVE (with proof from real projects): โ€ข When third-party SaaS gets too expensive at scale: replaced GoogleDocs, Zoom and Discord with a custom LiveKit platform, 2,000 students in one live class (Scholarly: 15,000+ users) โ€ข Sub-30ms latency for live music (Tyxit, Electron app: Montreux Jazz) โ€ข SIP/VoIP calling at scale: WebRTC-to-SIP bridges, FreeSWITCH, Telnyx (Nucleus, 5K+ businesses) โ€ข AI surveillance on Electron desktop apps: $5M+ fraud prevented across 10K+ locations (Live Eye) โ€ข AI voice agents processing 600M+ call min/mo (Nucleus) โ€ข Secure video conferencing at enterprise scale: up to 500 participants, AES-256 (iMind: used by PwC and national telecoms) โ€ข Computer vision: 99.5% face recognition, 500K+ plates/day (Mindbox .ai) โ€ข Live commerce at โ‚ฌ365M+ sales (Sprii: 72K+ events, 3K+ brands) โ€ข Sports tech: Premier League (Vokalo), NBC/CBS/Red Bull (StreamLayer, $14.1M raised) SPEC-FIRST AGENTIC AI: I work spec-first, not vibe-first. As CEO and architect, I write the full spec and architecture before any code. Then my senior team drives AI agents against strict guardrails to build production-grade systems. You get AI speed with the stability of a senior team. TECH I WORK WITH DAILY: โ—† Real-time, video, and audio: WebRTC, LiveKit, MediaSoup, MOQ, Ant, Kurento, Janus, Jitsi, Agora, FFmpeg, GStreamer, Wowza, HLS/DASH, RTMP/RTSP โ—† VoIP and telecom: SIP, FreeSWITCH, Telnyx, Twilio, Vonage โ—† Backend: Node.js, NestJS, Python, Go, PHP, PostgreSQL, MySQL, MongoDB, Redis โ—† Frontend and desktop: Electron, React, Next.js, Vue, Angular, JavaScript, TypeScript โ—† AI/ML: OpenAI API, Whisper, Deepgram, Speechmatics, Amazon Polly, TensorFlow, PyTorch, OpenCV โ—† Mobile: React Native, Flutter, Swift, Kotlin โ—† Infra: AWS, GCP, Azure, Docker, Kubernetes, CI/CD WHO I HELP: โ€ข Startups building their first video MVP โ€ข Scale-ups hitting WebRTC performance walls โ€ข Enterprises needing HIPAA/SOC2 video HOW I WORK: 1. 30-min call โ€“ assess your project honestly (including if we're NOT the right fit) 2. Written architecture + estimate within 24 hours 3. Dedicated team assigned within 1 week 4. I stay involved throughout โ€“ architecture reviews, tech decisions, escalations WAYS TO ENGAGE: build from scratch, drop in on the hard WebRTC/LiveKit/SIP/Electron modules, or rescue a stalled build. WHY FORA SOFT: 100% JSS, $10M+ earned, 925 jobs, 403K+ hours, 400+ clients across 17+ countries, 20 years in video, audio, and real-time software, Top WebRTC Developer 2022 and Top Telecom Developer 2024, 1 of 400 developers passes our internal selection. CLIENT FEEDBACK: "We've been working together for 10 years and continue. Fora Soft planned and built our entire video SaaS from scratch across web, iOS and Android." - Dustin, CTO @ VALT (50k users, 770 organizations, 2,500 IP cameras) โš ๏ธ Press Invite or message me. I'll send back a PRD, architecture, and an estimate within 24 hours.

  • WebRTC
  • VoIP
  • Electron
  • Node.js
  • React
  • JavaScript
  • Session Initiation Protocol
  • MongoDB
  • Python
  • Desktop Application
  • FFmpeg
  • React Native
  • Video Stream
  • API Integration
  • OpenAI API
  • Twilio API
  • FreeSWITCH
  • VoIP Software
  • Web Development
  • Software Architecture
Jon Paul D.

Mabalacat City, Philippines

$20/hr
5.0
13 jobs

I help businesses build, optimize, and manage enterprise-grade contact center solutions using RingCentral and NICE CXone. With 8,000+ hours worked and $100K+ earned on Upwork, I specialize in designing reliable IVR systems, intelligent call flows, routing logic, and customer support automation for both small businesses and large enterprises. What I Can Help You With: โœ” RingCentral UCaaS & CCaaS setup and administration โœ” NICE CXone / InContact development and support โœ” IVR and call flow design โœ” Studio scripting and automation โœ” Omnichannel customer support solutions โœ” API integrations and workflow automation โœ” Technical troubleshooting and platform support โœ” Contact center optimization and reporting โœ” Post-implementation support, maintenance, and system optimization Why Clients Work With Me: โœ” Certified and experienced contact center engineer โœ” Strong communication and project ownership โœ” Fast problem-solving and reliable delivery โœ” Able to manage projects from planning to deployment โœ” Ongoing support available after implementation I focus on building scalable, user-friendly customer experience solutions that improve efficiency and customer satisfaction. Letโ€™s discuss how I can help your business.

  • Business with 10-99 Employees
  • Business with 100-999 Employees
  • Desktop Support
  • NICE
  • VoIP Administration
  • VoIP Software
  • inContact
  • Call Center Management
  • Avaya
  • Implementation
  • Implementation Plan
  • RingCentral Glip
  • Dialpad
  • Back-End Development
  • Front-End Development
Jose M.

Heredia, Costa Rica

$75/hr
5.0
214 jobs

I specialize in VoIP solutions with a focus on RingCentral (EX & CX) and Zoom (Phone & CC) project implementation and ongoing support. As a subject matter expert in the field, I work with businesses of all sizes to streamline communication systems, resolve complex technical challenges, and deliver seamless transitions to cloud-based telephony. Here's what you can expect when working with me: Deep Roots in VoIP: I'm not just certified; I'm passionate about what I do. With experience in RingCentral, Avaya, Zoom and Vonage, I'm well-versed in the intricacies of these platforms both in its UCaaS and CCaaS versions. Your Time Matters: I understand that every second counts in your business. That's why you can rely on me for prompt responses and effective solutions. Who I Serve: From small startups to large enterprises, I've had the privilege of assisting businesses of all sizes. My expertise spans various industries, including law firms, universities, fitness, and finance, to name a few. Here is a list of the most common tasks I perform within a VoIP platform: Call queues / Auto Attendant - IVR Call Forwarding / Call Routing Voicemail Setup / Custom Answering Rules Porting / User setup / Limited extensions SMS Automation** (10DLC) Multi Site Call logging expert / Audit trail Announcement / Audio greetings - Voice over Desk Phone Provisioning I'm here, ready to be your partner in enhancing your communication systems. Reach out to me here on Upwork and let's start a conversation, looking forward to understanding your unique needs and finding the perfect solution for you!

  • Call Center Management
  • Business with 100-999 Employees
  • Phone Support
  • VoIP PBX
  • System Administration
  • System Configuration
  • VoIP
  • Telecommunications Engineering
  • IVR Software
  • Telephone System
  • RingCentral Glip
  • Avaya
  • VoIP Software
  • VoIP Administration
  • Technical Support
  • PBX
Ambiorix R.

Santo Domingo, Dominican Republic

$35/hr
5.0
282 jobs

Iโ€™m a VoIP specialist with extensive experience building solutions using Asterisk, FreePBX, and FreeSWITCH. Iโ€™m also a Phone AI agent developer with a strong background in AI phone agents based on the OpenAI API, ElevenLabs, and the VAPI framework. As a top Twilio developer, I work extensively with Twilio SMS and Voice APIs, integrating communication systems with external platforms. I also work with traditional call center solutions such as VICIdial, including IVRs, auto-dialers, and API integrations. Additionally, Iโ€™m a full-stack developer skilled in Python, Node.js, JavaScript, and PHP, with experience in both relational and non-relational databases, delivering end-to-end solutions from backend to frontend.

  • MySQL
  • jQuery
  • Twilio API
  • AJAX
  • Node.js
  • HTML5
  • PHP
  • JavaScript
  • Flutter
  • Asterisk
  • Session Initiation Protocol
  • Linux System Administration
  • Twilio
  • Android
Ali R.

Lahore, Pakistan

$25/hr
4.9
18 jobs

I develop scalable SaaS platforms and multi-vendor marketplaces tailored for growth. My core expertise includes integrating secure payment gateways like Stripe Connect to handle complex split payments. I also engineer reliable subscription billing systems that ensure consistent recurring revenue for your clients. โ€ข ๐—”๐—œ ๐—ง๐—ผ๐—ผ๐—น๐˜€: Ultra-fast deployment using cutting-edge tools like Bolt, Bubble, Cursor, and Claude. โ€ข๐—ช๐—ฒ๐—ฏ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜: Proficient in creating dynamic and responsive web applications. โ€ข ๐— ๐—ฎ๐—ฟ๐—ธ๐—ฒ๐˜๐—ฝ๐—น๐—ฎ๐—ฐ๐—ฒ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜: Skilled in developing and optimizing marketplace platforms for various industries. โ€ข ๐—ฆ๐˜๐—ฟ๐—ถ๐—ฝ๐—ฒ ๐—œ๐—ป๐˜๐—ฒ๐—ด๐—ฟ๐—ฎ๐˜๐—ถ๐—ผ๐—ป: Expert in Stripe Connect, subscription management, webhook handling, and troubleshooting. โ€ข ๐—™๐˜‚๐—น๐—น ๐—ฆ๐˜๐—ฎ๐—ฐ๐—ธ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜: Skilled in both frontend and backend technologies, including Laravel, React, and Vue.js. โ€ข ๐—”๐—ฃ๐—œ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜ ๐—ฎ๐—ป๐—ฑ ๐—œ๐—ป๐˜๐—ฒ๐—ด๐—ฟ๐—ฎ๐˜๐—ถ๐—ผ๐—ป: Experienced in developing and integrating APIs for enhanced functionality. โ€ข ๐—–๐— ๐—ฆ ๐—ฃ๐—น๐—ฎ๐˜๐—ณ๐—ผ๐—ฟ๐—บ๐˜€: Proficient in WordPress and Shopify development and customization. Technical Stack: - Backend: Laravel, Node.js - Frontend: React, Vue.js - CMS: WordPress, Shopify - AI tools: Make and n8n Rate: My hourly rate ranges from $25 to $30, depending on the project scope and requirements. As a long-term technical partner, I am committed to delivering high-quality solutions that align with your business goals. My real-world experience in developing complex systems ensures that your web applications are reliable, scalable, and optimized for performance.

  • Stripe
  • Web Design
  • API
  • Web Development
  • Back-End Development
  • WordPress Development
  • SaaS Development
  • Zapier
  • Make.com
  • Stripe API
  • Bubble.io
  • Shopify
  • Shopify Theme
  • Full-Stack Development
  • Supabase
  • API Integration
  • Payment Gateway Integration
  • Shopify Development
Annas K.

Houston, Texas

$70/hr
4.6
57 jobs

๐—ฅ๐—ฒ๐—ฎ๐—ฑ ๐—บ๐—ฒ ๐˜๐—ต๐—ฟ๐—ผ๐˜‚๐—ด๐—ต ๐—บ๐˜† ๐—ฝ๐—ฟ๐—ผ๐—ณ๐—ถ๐—น๐—ฒ ๐—ฎ๐—ป๐—ฑ ๐—บ๐˜† ๐—ฐ๐—น๐—ถ๐—ฒ๐—ป๐˜๐˜€' ๐—ณ๐—ฒ๐—ฒ๐—ฑ๐—ฏ๐—ฎ๐—ฐ๐—ธ ๐—ถ๐—ณ ๐˜†๐—ผ๐˜‚ ๐˜„๐—ฎ๐—ป๐˜ ๐—ฎ๐—ป ๐—œ๐—ฑ๐—ฒ๐—ฎ๐—น ๐—–๐—ฎ๐—ป๐—ฑ๐—ถ๐—ฑ๐—ฎ๐˜๐—ฒ ๐—ฎ๐—ป๐—ฑ ๐—ฎ ๐˜€๐—บ๐—ผ๐—ผ๐˜๐—ต ๐—ฝ๐—ฟ๐—ผ๐—ฐ๐—ฒ๐˜€๐˜€ ๐—ณ๐—ผ๐—ฟ ๐˜†๐—ผ๐˜‚๐—ฟ ๐—ฝ๐—ฟ๐—ผ๐—ท๐—ฒ๐—ฐ๐˜. Top-rated Plus Full-Stack Developer with 12+ years of experience building SaaS platforms, internal business systems, dashboards, customer portals, and Stripe subscription products using React, Next.js, Node.js, TypeScript, PostgreSQL, and AWS. I work with startups, SaaS companies, and growing businesses that need more than a basic website. My focus is on building software products and business platforms that improve workflows, reduce manual work, and give teams a system they can actually rely on as they grow. Whether youโ€™re launching a new SaaS product, building an internal operations platform, replacing spreadsheets and manual processes, creating a subscription-based application, or integrating AI into an existing product, I can help take it from planning to production. ๐—ฅ๐—˜๐—–๐—˜๐—ก๐—ง ๐—ฃ๐—ฅ๐—ข๐—๐—˜๐—–๐—ง ๐—˜๐—ซ๐—ฃ๐—˜๐—ฅ๐—œ๐—˜๐—ก๐—–๐—˜ (๐—ฌ๐—ผ๐˜‚ ๐—ฐ๐—ฎ๐—ป ๐—ฎ๐—น๐˜€๐—ผ ๐˜€๐—ฒ๐—ฒ ๐—ถ๐—ป ๐˜๐—ต๐—ฒ ๐—ฟ๐—ฒ๐—ฐ๐—ฒ๐—ป๐˜ ๐—๐—ผ๐—ฏ๐˜€): ๐—›๐—ฒ๐—ฎ๐—น๐˜๐—ต๐—ฐ๐—ฎ๐—ฟ๐—ฒ ๐—ฆ๐—ฎ๐—ฎ๐—ฆ ๐—ฃ๐—น๐—ฎ๐˜๐—ณ๐—ผ๐—ฟ๐—บ (๐—”๐—™๐—› ๐—›๐—ผ๐—บ๐—ฒ๐˜€) Built a HIPAA-compliant operations platform for Adult Family Homes that centralized admissions, onboarding, compliance workflows, incident reporting, audit trails, document generation, e-signatures, and multi-facility management. The system replaced fragmented manual processes and created a scalable operational foundation for long-term growth. ๐—”๐—œ ๐—›๐—ฒ๐—ฎ๐—น๐˜๐—ต๐—ฐ๐—ฎ๐—ฟ๐—ฒ ๐—ฆ๐—ฎ๐—ฎ๐—ฆ ๐—ฃ๐—น๐—ฎ๐˜๐—ณ๐—ผ๐—ฟ๐—บ (๐—ก๐—ฒ๐˜‚๐—ฟ๐—ผ๐—–๐—ผ๐—ฑ๐—ฒ ๐— ๐——๐— ) Led the end-to-end development of an AI-powered SaaS platform that helps physicians and medical coders review clinical documentation against AMA E/M guidelines, generate CPT E/M and ICD-10 coding recommendations, identify documentation gaps, and improve coding accuracy. I handled application architecture, AI integration, authentication, subscription logic, database design, and deployment. ๐—ฆ๐˜๐—ฟ๐—ถ๐—ฝ๐—ฒ ๐—ฆ๐˜‚๐—ฏ๐˜€๐—ฐ๐—ฟ๐—ถ๐—ฝ๐˜๐—ถ๐—ผ๐—ป ๐—ฆ๐—ฎ๐—ฎ๐—ฆ ๐—ฃ๐—น๐—ฎ๐˜๐—ณ๐—ผ๐—ฟ๐—บ (๐—ฃ๐—ฎ๐—ฟ๐˜๐˜† ๐—•๐—ฎ๐—ป๐—ฑ๐˜€) Designed and implemented the full Stripe subscription infrastructure for Party Bands, including Stripe Checkout, subscription management, webhook handling, renewals, cancellations, failed payment recovery, and customer billing workflows. The system was built to support recurring revenue growth with reliable payment and subscription handling in production. WHAT I BUILD โ€ข SaaS platforms and multi-tenant web applications โ€ข Custom business software and internal operations systems โ€ข CRM systems, admin dashboards, and workflow tools โ€ข Subscription products and Stripe billing platforms โ€ข Customer portals and self-service platforms โ€ข AI-powered features, GPT integrations, and business automation โ€ข Healthcare and HIPAA-conscious operational software โ€ข API-driven applications and third-party integrations โ€ข Startup MVPs that need to move from idea to production quickly Areas of Expertise: Full Stack Developer, React Developer, Next.js Developer, Node.js Developer, JavaScript Developer, TypeScript Developer, MERN Stack Developer, SaaS Developer, SaaS Application Developer, Startup Developer, MVP Developer, Web Application Developer, Software Developer, API Developer, Stripe Developer, Stripe Integration, Stripe API, Stripe Connect, Stripe Billing, Stripe Checkout, Stripe Subscription, Payment Gateway Integration, PostgreSQL Developer, MongoDB Developer, Supabase Developer, AWS Developer, Docker Developer, Vercel Developer CORE TECHNOLOGIES React.js โ€ข Next.js โ€ข Node.js โ€ข TypeScript โ€ข JavaScript โ€ข PostgreSQL โ€ข MongoDB โ€ข MySQL โ€ข REST APIs โ€ข GraphQL โ€ข OpenAI API โ€ข Stripe API โ€ข AWS โ€ข Docker โ€ข Authentication Systems โ€ข Role-Based Access Control (RBAC) WHAT CLIENTS WORK WITH ME FOR โœ” Building SaaS products from idea to launch โœ” Structuring scalable backend systems and application architecture โœ” Developing dashboards, portals, and internal business tools โœ” Integrating Stripe subscriptions, billing flows, and payment systems โœ” Adding AI capabilities into products and operational workflows โœ” Improving, stabilizing, and scaling existing web applications I donโ€™t approach projects as isolated development tasks. I look at business goals, user workflows, system structure, scalability, and long-term maintainability before development starts. That helps me build software that is easier to operate, easier to extend, and better aligned with how the business actually works. Over the years, Iโ€™ve worked on SaaS products, healthcare platforms, CRM systems, subscription businesses, customer portals, internal operations software, and AI-enabled applications that help teams work more efficiently and scale with less friction. If you need a developer who can help architect, build, and scale a SaaS platform, business application, AI-powered product, Stripe-based subscription system, or internal operations platform, feel free to reach out and share the details of your project.

  • Full-Stack Development
  • SaaS Development
  • Stripe
  • Back-End Development
  • React
  • Stripe API
  • Next.js
  • Node.js
  • TypeScript
  • JavaScript
  • API Development
  • Payment Gateway Integration
  • Database Architecture
  • PostgreSQL
  • AWS Development
  • AI App Development
  • Software Architecture
  • OpenAI API
  • Web Application Development
  • RESTful API

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