---
title: 'Full Stack Engineer at Phonely'
canonical: 'https://feeny.ai/job/full-stack-engineer-phonely-san-francisco-vd0g7nbnac18'
type: 'job'
last_seen: '2026-10-15'
---

# Full Stack Engineer at Phonely

- **Company:** Phonely
- **Location:** San Francisco, CA
- **Compensation:** $160k–$210k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-04-13
- **Last confirmed live:** 2026-10-15
- **Apply:** https://jobs.ashbyhq.com/phonely/a0c06ecc-4096-4c76-a1ce-ea98e2e67f6a

## Job description

Senior Full Stack Engineer (React / Next.js) At some point in the future, every business will answer their phone with voice AI. We are making sure that when they build that AI agent, the experience of doing so doesn’t suck. We’re growing incredibly fast and need someone who thrives in a dynamic, high-pressure environment to work across our engineering stack. This role is critical to the success of our company. We’re looking for someone who will roll up their sleeves, dig in, and double down when things get tough. We want someone highly technical, driven, and fun to work with. You’ll be working directly with engineering, product, and customer-facing teams to build and ship fast. NOTE: This is an engineering position. You will be writing a lot of code, and it will be a lot of work. If you’re looking for a cushy corporate job where nothing gets done, this is not the place. If you want to be part of a winning team and make a real difference, read on. This role is in-office 5 days a week in San Francisco.

## Your Day-to-Day

- Build and maintain high-performance, responsive web applications using React and Next.js
- Design and implement end-to-end features across frontend and backend systems
- Work closely with backend engineers to integrate APIs, real-time systems, and voice AI workflows
- Own UI/UX quality—craft fast, intuitive, and reliable user experiences
- Manage state effectively across complex applications (server + client state)
- Optimize frontend performance (latency, rendering, caching, edge delivery)
- Build internal tools and dashboards for monitoring, debugging, and controlling AI agents
- Write clean, maintainable, and well-tested code across the stack
- Debug production issues and continuously improve reliability and usability
- Contribute to system design, architecture decisions, and product direction

## Qualifications

- 5+ years of experience building production applications
- Strong experience with React and Next.js
- Experience building full-stack applications (API design, backend integration)
- Solid understanding of TypeScript, modern frontend tooling, and state management
- Experience working with APIs, real-time systems, and async data flows
- Understanding of performance optimization and scalable frontend architecture
- Familiarity with cloud environments, CI/CD, and modern deployment workflows
- Strong product sense and attention to detail
- Clear communicator who can work across teams

Our Software Stack

- Frontend: React, Next.js, TypeScript
- Backend: Python, microservices, async systems
- Cloud & Infra: AWS, GCP, Kubernetes, Redis
- Databases: Firebase, Supabase
- Observability: Datadog, logging, metrics, tracing
- Voice AI: SIP, real-time call handling, LLM orchestration
- Other: CI/CD, testing, resilient architecture

Why Join Phonely? We’re a team of ex-athletes, founders, and builders. Low ego, high standards. We believe life isn’t about taking the easy road - it’s about pushing yourself to see what you’re capable of. Working here feels like a team:

- We eat meals together (company-paid)
- We run, hike, and surf
- We travel together (Airbnbs in places like the Rockies, Costa Rica, Indonesia—multiple times a year)

We are deeply customer-obsessed and focused on building something we actually want to use. We’re tackling voice AI problems that haven’t been solved before, with a goal of building something 1M+ businesses love.

## About Phonely

## Company Overview
- **One-liner**: Phonely provides lifelike AI voice agents that answer business phone calls, manage chats and SMS, and automate customer interactions across channels.
- **Entity Type**: Private (Series A)
- **Headquarters**: San Jose, California, United States
- **Founded**: 2023
- **Founders**: Not publicly listed (CEO: William Bodewes)

## Core Business
- **Industry**: Voice AI / Customer Communication Automation
- **Target Customers**: B2B – SMBs to Fortune 500 enterprises; verticals include healthcare, home services, legal, insurance, real estate, e‑commerce, and contact centers.
- **Mission**: *“Building technology that lets businesses provide better support to their customers, lets doctors see more patients, and lets the rest of us never get put on hold again.”* [phonely.ai/about](https://www.phonely.ai/about)

## Products & Services
- **Phonely AI Receptionist**: Natural, human‑like voice agent that handles inbound calls – appointment scheduling, lead qualification, routing, payments, follow‑up, and outbound outreach. Supports 100+ languages and voice cloning. [phonely.ai](https://www.phonely.ai/)
- **Omnichannel Platform**: Extends AI agents to phone, live chat, SMS, and API – delivering consistent experiences across channels.
- **Analytics & Optimization**: Call recording, transcription, AI‑powered insights, and performance dashboards to continuously improve conversations.
- **Custom Workflows**: Configurable conversation flows, scripts, tone, routing logic, and escalation paths. Integrates with CRMs, scheduling software, and other business tools.
- **Compliance & Security**: SOC 2, HIPAA, GDPR, CCPA, PCI compliant – built for regulated, high‑stakes conversations.

## Market Standing
- **Valuation**: Not disclosed
- **Key Metric**: Raised **$16.5 M** in total funding (Series A of $16 M closed in 2026). [cbinsights.com](https://www.cbinsights.com/company/phonely)
- **Notable Investors**: Y Combinator, Base10 Partners, Etech, EngageCX, TSA Telco Group (over 10 investors total).
- **Growth Signals**:
  - **10,000+** businesses using the platform
  - **100,000+** calls per day processed
  - **70%** reduction in operational costs reported by customers
  - **70%** of businesses set up in less than 5 minutes
  - Trusted by Fortune 500 companies and backed by leading accelerator Y Combinator.

## Competitive Advantages
- **Lifelike AI**: Voice agents built by PhD researchers with natural turn‑taking, emotion handling, and voice cloning that sounds human.
- **Omnichannel Unity**: One platform for phone, chat, SMS, and API – not just voice.
- **Enterprise‑Grade Compliance**: Supports HIPAA, SOC 2, GDPR, CCPA, and PCI out of the box – critical for healthcare, legal, and finance.
- **Rapid Deployment**: 70% of businesses go live in under 5 minutes; enterprise gets dedicated setup teams.
- **Deep Integrations**: Pre‑built connectors to CRMs, scheduling tools, and payment systems – zero human intervention possible.

## Strategic Focus
- **Scale AI‑First Customer Communication**: Expand the platform’s capability to handle millions of calls while maintaining quality and compliance.
- **Vertical Expansion**: Deepen workflows for high‑regulation industries (healthcare, legal, insurance).
- **Community & Partner Ecosystem**: Host webinars, roundtables, and a Slack community to share playbooks and foster customer success.
- **Continuous Optimization**: Use analytics and machine learning to make every agent smarter and every call more effective.

## Why Work Here
- **Culture**: Values include *customer obsession*, *intensity* (fast shipping and iteration), *attention to detail*, and *trust* (building for regulated environments).
- **Team**: Composed of AI researchers, engineers, operators, and customer‑obsessed builders – described as “people who know voice AI is hard.”
- **Impact**: Work on a platform that handles 100K+ daily calls for 10K+ businesses, from small clinics to Fortune 500 enterprises.
- **Growth**: Join an early‑stage (Series A) company backed by Y Combinator, with significant runway and customer traction.
- **Work Model**: Not explicitly stated as remote or hybrid; HQ in San Jose, CA. Careers page lists open positions.
- **Perks**: Opportunity to shape the future of voice AI, work with PhD researchers, and build at the intersection of AI and real‑world customer communication.

## Sources
1. [Phonely AI – Product & Company Overview](https://www.phonely.ai/)
2. [Phonely About Page – Mission & Team](https://www.phonely.ai/about)
3. [Phonely Careers Page](https://www.phonely.ai/careers)
4. [CB Insights – Funding, Investors, HQ Details](https://www.cbinsights.com/company/phonely)

## Other roles at Phonely

- [Operations Specialist](https://feeny.ai/job/operations-specialist-phonely-san-francisco-74w5enaf2n9a) — San Francisco, CA
- [QA Engineer](https://feeny.ai/job/qa-engineer-phonely-canada-md7gp7nn8mk1) — Canada
- [Founding Product Manager](https://feeny.ai/job/founding-product-manager-phonely-san-francisco-k5pvxa9k4hzy) — San Francisco, CA
- [Founding Content Marketing Lead](https://feeny.ai/job/founding-content-marketing-lead-phonely-san-francisco-nfqhxft889cn) — San Francisco, CA
- [Technical Customer Success Manager](https://feeny.ai/job/technical-customer-success-manager-phonely-san-francisco-2wh3dm68htrb) — San Francisco, CA
- [Founding Brand Designer](https://feeny.ai/job/founding-brand-designer-phonely-san-francisco-vtxmdsjrq3rt) — San Francisco, CA
- [Senior Business Development Representative](https://feeny.ai/job/senior-business-development-representative-phonely-san-francisco-h4b6r9kf0ggt) — San Francisco, CA
- [Business Development Representative](https://feeny.ai/job/business-development-representative-phonely-san-francisco-yavhbsmdgxk6) — San Francisco, CA
- [Content Marketing Intern](https://feeny.ai/job/content-marketing-intern-phonely-san-francisco-884hqnm64mdv) — San Francisco, CA
- [Software Engineer Intern](https://feeny.ai/job/software-engineer-intern-phonely-san-francisco-hacsghp5gjzk) — San Francisco, CA