Senior Full-Stack Engineer: Kotlin/React, AI & Scale

sunday; Atlanta (GA); Hybrid; USD 120,000 - 190,000; Full time

Benefits offered by this job

Stock options

Unlimited PTO

Significant ownership opportunities

Employer-paid health insurance for you

Employer-paid health insurance for you

50% transportation reimbursements

Paris office in Sentier district

Hybrid work model

Remote-work stipend of 50

Job summary

sunday is seeking a Senior Software Engineer to design and deliver high-impact full-stack features, from Kotlin backend services to React frontend experiences, while accelerating development with AI agents. You will own complex tech challenges, balancing speed, simplicity, and robustness, and contribute to scalable services.

Report to Nicolas and join the Tech team in a hybrid role. You will influence architecture, reliability, and trade-offs, with a strong business sense and fluency in French

Qualifications

• Several years of full-stack experience with Kotlin backend and React frontend.
• Experience deploying high-load services in production.
• Hands-on experience with AI-assisted development tools.
• Ability to reason about architecture, reliability, and trade-offs.
• Strong business acumen and prioritization of impactful work.
• 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 speed.
• Share standards, learnings and convictions to help the team grow.

Skills

Kotlin backend

React frontend

AI agents development

High-load services

System architecture

Business acumen

French & English

Job description

sunday is seeking a Senior Software Engineer to design and deliver high-impact full-stack features, from Kotlin backend services to React frontend experiences, while accelerating development with AI agents. You will own complex tech challenges, balancing speed, simplicity, and robustness, and contribute to scalable services.

Report to Nicolas and join the Tech team in a hybrid role. You will influence architecture, reliability, and trade-offs, with a strong business sense and fluency in French