About Phonely

There are billions of calls made every day which will soon be handled by AI. Today 70% of business customer support calls are outsourced to call centers and contact centers. These call centers are looking for a solution that they can build simulate, and deploy voice agents all in one platform. We are building this.

Through YC we grew at 22% week over week and went through demo day with the some of the top revenue in the batch. We already work with the largest contact centers in the world and are looking for people that want to build the future of AI phone support together.

San Francisco, CA — On-site, Full Time

AI voice is the future. We’re building it. Want in?

About Phonely

Every day, billions of people call businesses. We believe AI will soon handle most of those calls — and we’re building the infrastructure to power it.

Phonely is a full-stack platform for building, simulating, and deploying AI voice agents that actually work. Think: ultra-reliable LLMs, real-time voice infra, and a Zapier-style UI that makes automation feel effortless.

We’re growing fast — averaging 30% month over month growth for the past 6 months with virtually no advertising — and now we’re looking for a Frontend Engineer who’s excited to design and build a product that’s both powerful and beautiful.

What You’ll Be Doing

• Own major parts of our front-end architecture
• Help us scale and polish our no-code builder
• Work directly with founders, designers, and backend engineers to bring features to life.
• Obsess over UX. Sweat the details. Ship fast, then make it faster.
• Help shape product decisions — you’re not just here to implement pixels.
• Lay down patterns that will scale with the team and the product.

What We’re Looking For

• 4+ years of frontend experience in a fast-moving product team
• Deep experience with React (ideally + TypeScript, Tailwind, and modern tooling)
• Strong product sense — you care how things feel, not just how they work
• Experience building complex UIs (dashboards, editors, data-driven views)
• A bias for shipping — you turn ideas into real product quickly

Bonus Points

• Experience with React Flow or other visual/graph libraries
• Ex-founder or early employee at a startup
• You’re an ex athlete or done something competitive and won
• Built or worked on a Zapier-style or no-code product before
• You’ve designed or contributed to component systems or design libraries
• Interest in voice, AI, or real-time systems

Why Join Us

• Huge ownership — you’ll be the foundation of our frontend team

• Equity in a fast-growing YC company

• Work directly with founders

• Breakfast, lunch, and dinner — we work on-site in SF

• We’re building something big, and we care deeply about quality

  No visa sponsorship. US-based only.

To achieve human-level performance with voice AI agents, we need 99.9% reliability across all verticals. Building a high-performing Voice AI solution requires a combination of key elements:

1. Voice AI Infrastructure: Develop robust systems that can handle real-time conversations seamlessly.
2. API Integrations: Connect with relevant software to ensure smooth interactions.
3. LLM Testing, Simulation, and Evaluation: Validate models under various conditions to ensure accuracy.
4. Performance Monitoring: Continuously track metrics to optimize system performance.
5. Countless Other Tasks: From scaling infrastructure to managing edge cases, achieving this level of reliability is no small feat.

We’ve brought all of these elements together in one place so enterprises can integrate reliable and accurate voice AI into their offerings in minutes, not months.