Senior Full-Stack Engineer (Kotlin/React) with AI

Sunday; Atlanta (GA); Hybrid; USD 140,000 - 190,000; Full time

Benefits offered by this job

Stock options

Unlimited PTO

Career growth

Health insurance

Transit reimbursement

Paris office

Hybrid work

Remote-expenses €50

39-hour work week

Job summary

Sunday is building the fastest, simplest way to pay in restaurants. As a Senior Software Engineer, you will design and deliver high-impact full-stack features from Kotlin backend services to React frontend experiences, leveraging AI agents to accelerate delivery.

You will report to Nicolas and join the Tech team, owning complex technical challenges at scale. You will design production-ready solutions for high loads, continuously improve development practices, and collaborate across the

Qualifications

• Several years of full-stack development experience with Kotlin on the backend and React.js on the frontend.
• Proven experience deploying and operating high-load services in production.
• Hands-on experience with AI agents or AI-assisted development tools.
• Ability to reason about architecture, reliability, and trade-offs.
• Fluency in both French and English, spoken and written.

Responsibilities

• Design and deliver high-quality full-stack features from Kotlin backend services to React.js frontend applications.
• Write code using AI agents and help build a true agentic software factory.
• Take ownership of complex topics related to software design, architecture, and service reliability.
• Design solutions capable of running in production at scale.
• Continuously improve development practices and team efficiency through agentic AI.
• Make pragmatic technical decisions considering business impact, simplicity, and execution speed.
• Share standards, learnings, and convictions to help the team grow.

Skills

Kotlin

React.js

AI agents

High-load services

Architectural trade-offs

English & French fluency

Job description

Sunday is building the fastest, simplest way to pay in restaurants. As a Senior Software Engineer, you will design and deliver high-impact full-stack features from Kotlin backend services to React frontend experiences, leveraging AI agents to accelerate delivery.

You will report to Nicolas and join the Tech team, owning complex technical challenges at scale. You will design production-ready solutions for high loads, continuously improve development practices, and collaborate across the