Senior Full Stack Engineer — React/Next.js (SF In-Office)

Phonely; United States; On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Company-paid meals

Group travel / team trips (Airbnbs)

High-performance culture

Job summary

Phonely is seeking a Senior Full Stack Engineer to own and ship high-performance web features using React and Next.js. You will work across frontend and backend, integrating APIs and real-time workflows, and own UI/UX quality.

The role emphasizes fast, reliable delivery and collaboration with product and customer-facing teams. Ideal candidates bring 5+ years in production apps, strong React/Next.js and TypeScript skills, and experience with API design and modern tooling.

Qualifications

• 5+ years of experience building production applications.
• Strong experience with React and Next.js, TypeScript.
• Experience designing full-stack features and API integration.

Responsibilities

• 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.
• Collaborate with backend engineers to integrate APIs and real-time workflows.
• Own UI/UX quality, crafting fast, intuitive user experiences.
• Manage complex state across server and client, optimize frontend performance.

Skills

React

Next.js

TypeScript

API design

Backend integration

State management

Performance optimization

Cloud environments

CI/CD

Communication

Tools

AWS

GCP

Kubernetes

Redis

Datadog

Python

Firebase

Supabase

CI/CD tooling

Job description

Phonely is seeking a Senior Full Stack Engineer to own and ship high-performance web features using React and Next.js. You will work across frontend and backend, integrating APIs and real-time workflows, and own UI/UX quality.

The role emphasizes fast, reliable delivery and collaboration with product and customer-facing teams. Ideal candidates bring 5+ years in production apps, strong React/Next.js and TypeScript skills, and experience with API design and modern tooling.